共查询到20条相似文献,搜索用时 328 毫秒
1.
Hongbo Yu Lixia Wang Huatong Li Zuyang Luo Dr. Tayirjan Taylor Isimjan Prof. Dr. Xiulin Yang 《Chemistry (Weinheim an der Bergstrasse, Germany)》2022,28(60):e202201784
Metal-organic frameworks (MOFs) have been considered as potential oxygen evolution reaction (OER) electrocatalysts owning to their ultra-thin structure, adjustable composition, high surface area, and high porosity. Here, we designed and fabricated a vanadium-doped nickel organic framework (V1−x−NixMOF) system by using a facile two-step solvothermal method on nickel foam (NF). The doping of vanadium remarkably elevates the OER activity of V1−x−NixMOF, thus demonstrating better performance than the corresponding single metallic Ni-MOF, NiV-MOF and RuO2 catalysts at high current density (>400 mA cm−2). V0.09−Ni0.91MOF/NF provides a low overpotential of 235 mV and a small Tafel slope of 30.3 mV dec−1 at a current density of 10 mA cm−2. More importantly, a water-splitting device assembled with Pt/C/NF and V0.09−Ni0.91MOF/NF as cathode and anode yielded a cell voltage of 1.96 V@1000 mA cm−2, thereby outperforming the-state-of-the-art RuO2(+)||Pt/C(−). Our work sheds new insight on preparing stable, efficient OER electrocatalysts and a promising method for designing various MOF-based materials. 相似文献
2.
Dr. Hamidreza Arandiyan Dr. Sajjad S. Mofarah Dr. Yuan Wang Dr. Claudio Cazorla Dr. Deshetti Jampaiah Dr. Magnus Garbrecht Prof. Karen Wilson Prof. Adam F. Lee Prof. Chuan Zhao Prof. Thomas Maschmeyer 《Chemistry (Weinheim an der Bergstrasse, Germany)》2021,27(58):14418-14426
Perovskite oxides are regarded as promising electrocatalysts for water splitting due to their cost-effectiveness, high efficiency and durability in the oxygen evolution reaction (OER). Despite these advantages, a fundamental understanding of how critical structural parameters of perovskite electrocatalysts influence their activity and stability is lacking. Here, we investigate the impact of structural defects on OER performance for representative LaNiO3 perovskite electrocatalysts. Hydrogen reduction of 700 °C calcined LaNiO3 induces a high density of surface oxygen vacancies, and confers significantly enhanced OER activity and stability compared to unreduced LaNiO3; the former exhibit a low onset overpotential of 380 mV at 10 mA cm−2 and a small Tafel slope of 70.8 mV dec−1. Oxygen vacancy formation is accompanied by mixed Ni2+/Ni3+ valence states, which quantum-chemical DFT calculations reveal modify the perovskite electronic structure. Further, it reveals that the formation of oxygen vacancies is thermodynamically more favourable on the surface than in the bulk; it increases the electronic conductivity of reduced LaNiO3 in accordance with the enhanced OER activity that is observed. 相似文献
3.
Chi Zhang Dr. Chen Zhang Yunchao Xie Jheng-Wun Su Dr. Xiaoqing He John D. Demaree Mark H. Griep Prof. Jerry L. Atwood Prof. Jian Lin 《Chemistry (Weinheim an der Bergstrasse, Germany)》2019,25(16):4036-4039
An iron oxide decorated nickel iron alloy nanoparticle/porous graphene hybrid exhibits high electrocatalytic activity and excellent durability toward oxygen evolution reaction (OER). It displays a low overpotential of 274 mV at 10 mA cm−2, and low Tafel slope of 37 mV dec−1, showing a superior performance to the state-of-the-art RuO2 OER electrocatalyst. 相似文献
4.
Rui-Jie Li Yu-Feng Qi Qian Wang Jia-Jun Wang Zheng-Yu Liu Xiu-Guang Wang Xiao-Jun Zhao En-Cui Yang 《无机化学与普通化学杂志》2020,646(17):1412-1418
Developing earth-abundant, highly active and long-term durable electrocatalysts for oxygen evolution reaction (OER) is highly desirable and great challenging for large-scale industrial application of electrochemical water splitting. Herein, in-situ growth of uniform nanosheet arrays on nickel foam (NF) is hydrothermally achieved by varying feed ratios of FeIII and NiII salts. The feed ratio of the two active metals has significantly dominated both the morphological and electronic structures of the resultant electrocatalysts, leading to feed ratio-dependent volcano-type OER activity. The optimized Fe0.89Ni0.11-BDC/NF exhibits the best OER performance, affording a low overpotential of 220 mV to drive a current density of 50 mA · cm–2 with small Tafel slope of 44.8 mV · dec–1 and long-lasting stability over 20 hours. The synergistic effect from the FeIII and NiII species on both the morphological and electronic structure modulations have dramatically accelerated the reaction kinetics, responsible eventually for the enhanced OER activity. This work provides valuable information for nanostructured MOFs as efficient electrocatalysts. 相似文献
5.
《Arabian Journal of Chemistry》2021,14(12):103440
Water electrolysis is a promising method for hydrogen production, so the preparation of low-cost and efficient electrocatalysts with a quick and simple procedure is crucial. Herein, iron phosphate (Fe7(PO4)6) was prepared via microwave radiation using ionic liquid (IL) as iron and phosphorus dual-source. This method is simple and rapid, and the product can be directly used as electrocatalysts without further treatment. The experimental results show that the IL can influence the morphology and electrocatalytic performance. Moreover, the addition of carbon nanotubes (CNTs) is favorable for formation of iron phosphate nanoparticles to improve the catalytic activities. As hydrogen evolution reaction (HER) catalyst, this iron phosphate/CNTs exhibits an onset overpotential of 120 mV, Tafel slope of 32.9 mV dec-1, and current densities of 10 mA cm−2 at overpotential of 185 mV. Then, it obtains a good activity for oxygen evolution reaction (OER) with a low onset potential of 1.48 V, Tafel slope of 73.3 mV dec-1, and it only needs an overpotential of 300 mV to drive the 10 mA cm−2. This bifunctional catalyst also shows good durability for HER and OER. This microwave-assisted method provides an outstanding strategy to prepare iron phosphate in a simple and fast process with good catalytic performance for water splitting. 相似文献
6.
Xuechun Sun Dr. Jiaqi Wang Yuehui Yin Haibin Wang Shuang Li Dr. Hui Liu Jing Mao Prof. Xiwen Du 《Chemistry (Weinheim an der Bergstrasse, Germany)》2020,26(13):2793-2797
Cost-effective, highly efficient and stable non-noble metal-based catalysts for the oxygen evolution reaction (OER) are very crucial for energy storage and conversion. Here, an amorphous cobalt nickel phosphate (CoNiPO4), containing a considerable amount of high-valence Ni3+ species as an efficient electrocatalyst for OER in alkaline solution, is reported. The catalyst was converted from Co-doped Ni2P through pulsed laser ablation in liquid (PLAL) and exhibits a large specific surface area of 162.5 m2 g−1 and a low overpotential of 238 mV at 10 mA cm−2 with a Tafel slope of 46 mV dec−1, which is much lower than those of commercial RuO2 and IrO2. This work demonstrates that PLAL is a powerful technology for generating amorphous CoNiPO4 with high-valence Ni3+, thus paving a new way towards highly effective OER catalysts. 相似文献
7.
Strong‐Coupled Cobalt Borate Nanosheets/Graphene Hybrid as Electrocatalyst for Water Oxidation Under Both Alkaline and Neutral Conditions
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Pengzuo Chen Kun Xu Tianpei Zhou Yun Tong Junchi Wu Han Cheng Xiuli Lu Hui Ding Prof. Changzheng Wu Prof. Yi Xie 《Angewandte Chemie (International ed. in English)》2016,55(7):2488-2492
Developing highly active catalysts for the oxygen evolution reaction (OER) is of paramount importance for designing various renewable energy storage and conversion devices. Herein, we report the synthesis of a category of Co‐Pi analogue, namely cobalt‐based borate (Co‐Bi) ultrathin nanosheets/graphene hybrid by a room‐temperature synthesis approach. Benefiting from the high surface active sites exposure yield, enhanced electron transfer capacity, and strong synergetic coupled effect, this Co‐Bi NS/G hybrid shows high catalytic activity with current density of 10 mA cm?2 at overpotential of 290 mV and Tafel slope of 53 mV dec?1 in alkaline medium. Moreover, Co‐Bi NS/G electrocatalysts also exhibit promising performance under neutral conditions, with a low onset potential of 235 mV and high current density of 14.4 mA cm?2 at 1.8 V, which is the best OER performance among well‐developed Co‐based OER electrocatalysts to date. Our finding paves a way to develop highly active OER electrocatalysts. 相似文献
8.
Yuwen Li Mengting Lu Panpan He Yuhang Wu Jiawen Wang Danni Chen Hui Xu Junkuo Gao Juming Yao 《化学:亚洲杂志》2019,14(9):1590-1594
Non‐noble metal‐based metal–organic framework (MOF)‐derived electrocatalysts have recently attracted great interest in the oxygen evolution reaction (OER). Here we report a facile synthesis of nickel‐based bimetallic electrocatalysts derived from 2D nanosheet‐assembled nanoflower‐like MOFs. The optimized morphologies and large Brunauer–Emmett–Teller (BET) surface area endow FeNi@CNF with efficient OER performance, where the aligned nanosheets can expose abundant active sites and benefit electron transfer. The complex nanoflower morphologies together with the synergistic effects between two metals attributed to the OER activity of the Ni‐based bimetallic catalysts. The optimized FeNi@CNF afforded an overpotential of 356 mV at a current density of 10 mA cm?2 with a Tafel slope of 62.6 mV dec?1, and also exhibited superior durability with only slightly degradation after 24 hours of continuous operation. The results may inspire the use of complex nanosheet‐assembled nanostructures to explore highly active catalysts for various applications. 相似文献
9.
Dr. Jun Kim Byeong Jo Min Dr. Taehyun Kwon Dr. Taekyung Kim Ho Chang Song Prof. Hyung Chul Ham Dr. Hionsuck Baik Prof. Kwangyeol Lee Dr. Jin Young Kim 《化学:亚洲杂志》2021,16(22):3630-3635
Transition metal phosphides (TMPs) as ever-evolving electrocatalytic materials have attracted increasing attention in water splitting reactions owing to their cost-effective, highly active and stable catalytic properties. This work presents a facile synthetic route to NiCoP nanoparticles with Ru dopants which function as highly efficient electrocatalysts for oxygen evolution reaction (OER) in alkaline media. The Ru dopants induced a high content of Ni and Co vacancies in NiCoP nanoparticles, and the more defective Ru doped NiCoP phase than undoped NiCoP ones led to a greater number of catalytically active sites and improved electrical conductivity after undergoing electrochemical activation. The Ru doped NiCoP catalyst exhibited high OER catalytic performance in alkaline media with a low overpotential of 281 mV at 10 mA cm−2 and a Tafel slope of 42.7 mV dec−1. 相似文献
10.
Nanoscale Trimetallic Metal–Organic Frameworks Enable Efficient Oxygen Evolution Electrocatalysis
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Fei‐Long Li Qi Shao Prof. Xiaoqing Huang Prof. Jian‐Ping Lang 《Angewandte Chemie (International ed. in English)》2018,57(7):1888-1892
Metal–organic frameworks (MOFs) are a class of promising materials for diverse heterogeneous catalysis, but they are usually not directly employed for oxygen evolution electrocatalysis. Most reports focus on using MOFs as templates to in situ create efficient electrocatalysts through annealing. Herein, we prepared a series of Fe/Ni‐based trimetallic MOFs (Fe/Ni/Co(Mn)‐MIL‐53 accordingly to the Material of Institute Lavoisier) by solvothermal synthesis, which can be directly adopted as highly efficient electrocatalysts. The Fe/Ni/Co(Mn)‐MIL‐53 shows a volcano‐type oxygen evolution reaction (OER) activity as a function of compositions. The optimized Fe/Ni2.4/Co0.4‐MIL‐53 can reach a current density of 20 mA cm?2 at low overpotential of 236 mV with a small Tafel slope of 52.2 mV dec?1. In addition, the OER performance of these MOFs can be further enhanced by directly being grown on nickel foam (NF). 相似文献
11.
Wen-Jie Jiang Shuai Niu Tang Tang Qing-Hua Zhang Xiao-Zhi Liu Yun Zhang Yu-Yun Chen Prof. Ji-Hui Li Prof. Lin Gu Prof. Li-Jun Wan Prof. Jin-Song Hu 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2017,129(23):6672-6677
The exploration of new efficient OER electrocatalysts based on nonprecious metals and the understanding of the relationship between activity and structure of electrocatalysts are important to advance electrochemical water oxidation. Herein, we developed an efficient OER electrocatalyst with nickel boride (Ni3B) nanoparticles as cores and nickel(II) borate (Ni-Bi) as shells (Ni-Bi@NB) via a very simple and facile aqueous reaction. This electrocatalyst exhibited a small overpotential of 302 mV at 10 mA cm−2 and Tafel slope of 52 mV dec−1. More interestingly, it was found that the OER activity of Ni-Bi@NB was closely dependent on the crystallinity of the Ni-Bi shells. The partially crystalline Ni-Bi catalyst exhibited much higher activity than the amorphous or crystalline analogues; this higher activity originated from the enhanced intrinsic activity of the catalytic sites. These findings open up opportunities to explore nickel(II) borates as a new class of efficient nonprecious metal OER electrocatalysts, and to improve the electrocatalyst performance by modulating their crystallinity. 相似文献
12.
Wei Zhou Li Yang Fu-Yu Zhou Qi-Wen Deng Xiao Wang Dr. Dong Zhai Dr. Guo-Qing Ren Prof. Dr. Ke-Li Han Prof. Dr. Wei-Qiao Deng Dr. Lei Sun 《Chemistry (Weinheim an der Bergstrasse, Germany)》2020,26(34):7720-7726
Exploring high-performance electrocatalysts, especially non-noble metal electrocatalysts, for the oxygen evolution reaction (OER) is critical to energy storage and conversion. Herein, we report for the first time that conjugated microporous polymers (CMPs) incorporating salen can be used as OER electrocatalysts with outstanding performances. The best OER electrocatalyst (salen-CMP-Fe-3) exhibits a low Tafel slope of 63 mV dec−1 and an overpotential of 238 mV at 10 mA cm−2. DFT and Grand Canonical Monte Carlo calculations confirmed that the significantly improved electrocatalytic properties can be attributed to the intrinsic catalytic activity of the salen moiety and the enrichment effect of the pore structures. This work demonstrates that salen-based conjugated polymers are a type of metal-coordinated porous polymer that show excellent catalyst performance. 相似文献
13.
Pengzuo Chen Kun Xu Zhiwei Fang Yun Tong Junchi Wu Xiuli Lu Xu Peng Hui Ding Changzheng Wu Yi Xie 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2015,127(49):14923-14927
Designing highly efficient electrocatalysts for oxygen evolution reaction (OER) plays a key role in the development of various renewable energy storage and conversion devices. In this work, we developed metallic Co4N porous nanowire arrays directly grown on flexible substrates as highly active OER electrocatalysts for the first time. Benefiting from the collaborative advantages of metallic character, 1D porous nanowire arrays, and unique 3D electrode configuration, surface oxidation activated Co4N porous nanowire arrays/carbon cloth achieved an extremely small overpotential of 257 mV at a current density of 10 mA cm−2, and a low Tafel slope of 44 mV dec−1 in an alkaline medium, which is the best OER performance among reported Co‐based electrocatalysts to date. Moreover, in‐depth mechanistic investigations demonstrate the active phases are the metallic Co4N core inside with a thin cobalt oxides/hydroxides shell during the OER process. Our finding introduces a new concept to explore the design of high‐efficiency OER electrocatalysts. 相似文献
14.
《化学:亚洲杂志》2017,12(20):2694-2702
Iron–cobalt phosphomolybdate (FeCoPM12) nanoparticles, which are highly efficient catalytic materials for the oxygen evolution reaction (OER), were fabricated through a coprecipitation route. Compared with iron–cobalt hydroxide and state‐of‐the‐art RuO2 electrocatalysts, the as‐prepared FeCoPM12 sample exhibited robust OER catalytic activity with a low overpotential of 258 mV at a current density of 10 mA cm−2 and a small Tafel slope of 33 mV dec−1. Moreover, the as‐synthesized sample presented preferable stability and after 10 h at 1.52 V the current density degraded by merely 8.3 %. This is ascribed to the high electrochemical stability and small porous structure of FeCoPM12, which provide effective electron transmission and improve the catalytic performance for OER in alkaline media. 相似文献
15.
Huaping Wang Juan Wang Yecan Pi Qi Shao Yueming Tan Xiaoqing Huang 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2019,131(8):2338-2342
Perovskite‐based electrocatalysts are one of the most promising materials for oxygen evolution reaction (OER), but their activity and durability are still far from desirable. Herein, we demonstrate that the double perovskite LaFexNi1?xO3 (LFNO) nanorods (NRs) can be adopted as highly active and stable OER electrocatalysts. The optimized LFNO‐II NRs with Ni/Fe ratio of 8:2 achieve a low overpotential of 302 mV at 10 mA cm?2 and a small Tafel slope of 50 mV dec?1, outperforming those of the commercial Ir/C. The LFNO‐II NRs also show high OER stability with slight current decrease after 20 h. The enhanced activity is explained by the improved surface area, tailored electronic structure as well as strong hybridization between O and Ni. 相似文献
16.
Jiayue Tian Prof. Dr. Feilong Jiang Prof. Dr. Daqiang Yuan Dr. Linjie Zhang Prof. Dr. Qihui Chen Prof. Dr. Maochun Hong 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2020,132(31):13201-13208
Facile preparation of low-cost electrocatalysts for efficient oxygen evolution reaction (OER) remains a big challenge. Herein, a novel strategy for ultrafast (20 s) transformation of bulk metal–organic frameworks (MOFs) into ultrathin metal oxyhydroxide nanosheets for efficient OER has been developed. For two isomeric MOFs ( FJI-H25Fe and FJI-H25FeCo ), only the metastable FJI-H25FeCo bulk can immediately transform into FeCo-oxyhydroxides nanosheets through electric-field assisted hydrolysis. The potential evolution process from MOF bulk to FeCo-oxyhydroxides nanosheets has been investigated in detail. The as-made nanosheets exhibit excellent OER performances, showing an extremely low overpotential of 231 mV at the current density of 10 mA cm−2, a relatively small Tafel slope of 42 mV dec−1, and long-term durability of at least 30 h. This work not only provides a novel strategy for facile preparation of low-cost and efficient OER electrocatalysts, but also represents a new way for preparation of metal oxyhydroxides nanosheets with good crystallinity and morphology, and a fresh method for mild synthesis of nanosized derivatives from MOF materials. 相似文献
17.
《无机化学与普通化学杂志》2018,644(18):1103-1107
A facile method is reported to form a honeycomb‐like porous nanomaterial by intercalation of iron nitrate using nature silk sericin (SS) as nitrogen and carbon source. A series of Fe2O3 nanoparticles anchored on Fe2O3‐N‐doped graphite carbon electrocatalysts (SS‐Fe) were synthesized, exhibits well‐defined pore structure and excellent oxygen evolution reaction (OER) catalytic activities. Among these materials, SS‐Fe‐0.5 shows the best performance, the overpotential of SS‐Fe‐0.5 at 10 mA · cm–2 is 440 mV (vs. RHE) and the Tafel slope is only 68 mV · dec–1. The results indicate that it is promising to the preparation of carbon catalyst materials using natural, renewable and abundant resources for electrocatalysis. 相似文献
18.
《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2017,129(41):12740-12744
Uniform Ni3C nanodots dispersed in ultrathin N‐doped carbon nanosheets were successfully prepared by carburization of the two dimensional (2D) nickel cyanide coordination polymer precursors. The Ni3C based nanosheets have lateral length of about 200 nm and thickness of 10 nm. When doped with Fe, the Ni3C based nanosheets exhibited outstanding electrocatalytic properties for both the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). For example, 2 at % Fe (atomic percent) doped Ni3C nanosheets depict a low overpotential (292 mV) and a small Tafel slope (41.3 mV dec−1) for HER in KOH solution. An outstanding OER catalytic property is also achieved with a low overpotential of 275 mV and a small Tafel slope of 62 mV dec−1 in KOH solution. Such nanodot‐incorporated 2D hybrid structures can serve as an efficient bifunctional electrocatalyst for overall water splitting. 相似文献
19.
Ruifu Ding Longjie Lin Chengang Pei Prof. Xu Yu Prof. Qijun Sun Prof. Ho Seok Park 《Chemistry (Weinheim an der Bergstrasse, Germany)》2021,27(43):11150-11157
Highly active and durable electrocatalysts are essential for producing hydrogen fuel through the hydrogen evolution reaction (HER). Here, a uniform deposition of Ru nanoparticles strongly interacting with oxygen-rich carbon nanotube architectures (Ru-OCNT) through ozonation and hydrothermal approaches has been designed. The hierarchical structure of Ru-OCNT is made by self-assembly of oxygen functionalities of OCNT. Ru nanoparticles interact strongly with OCNT at the Ru/OCNT interface to give excellent catalytic activity and stability of the Ru-OCNT, as further confirmed by density functional theory. Owing to the hierarchical structure and adjusted surface chemistry, Ru-OCNT has an overpotential of 34 mV at 10 mA cm−2 with a Tafel slope of 27.8 mV dec−1 in 1 M KOH, and an overpotential of 55 mV with Tafel slope of 33 mV dec−1 in 0.5 M H2SO4. The smaller Tafel slope of Ru-OCNT than Ru-CNT and commercial Pt/C in both alkaline and acidic electrolytes indicates high catalytic activity and fast charge transfer kinetics. The as-proposed chemistry provides the rational design of hierarchically structured CNT/nanoparticle electrocatalysts for HER to produce hydrogen fuel. 相似文献
20.
Yuyin Wang Yan Wang Li Zhang Prof. Dr. Chun‐Sen Liu Prof. Dr. Huan Pang 《化学:亚洲杂志》2019,14(16):2790-2795
To realize the effective conversion of renewable energy through water decomposition, efficient electrocatalysts for the oxygen evolution reaction (OER) are essential. In this article, PBA@POM was successfully prepared with a Prussian blue analogue (PBA) as the initial structure. A facile hydrothermal process is reported for obtaining PBA@POM by etching the cubic PBA with a strong Brønsted acid, H3PMo12O40 (HPMo). The hollow cube structure not only exposes more active sites but also promotes electron transport, which results in excellent electrocatalytic activity for the OER. Compared with the PBA, which initially simply adhered to POM, the optimum PBA@POM hybrids display remarkably enhanced OER catalytic activity, with an almost constant overpotential of 440 mV at a current density of 10 mA cm?2 and a small Tafel slope (23.45 mV dec?1). The facilely prepared PBA@POM with good electrochemical activity and stability promises great potential for the OER. 相似文献