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1.
Yunrui Wei Xixi Zhang Zonghua Wang Jiangmei Yin Jinzhao Huang Gang Zhao Xijin Xu 《中国化学快报》2021,32(1):119-124
Hollow nanostructures have attracted increasing research interest in hydrogen evolution reaction owing to their unique structural features.Herein,Ni-Co mixed metal phosphide hollow and porous polyhedrons was successfully composited(expressed as NiCoP).Benefiting from the synergistic effects of ZIF-67 by doping Ni elements and the well-defined hollow and porous structure,the as-synthesized NiCoP hollow and porous polyhedrons exhibit better electrochemical properties and mechanical stability for hydrogen evolution reaction over a pH-universal range,with a small Tafel slopes of 72,101,176 mV/dec,and a low overpotential of 82,102,261 mV at a current density of 10 mA/cm2 in 0.5 mol/L H2SO4,1 mol/L KOH and1 mol/L phosphate buffer solution(PBS).This general strategy can also be applied to fabricate other hollow cobalt-based phosphides and MOFs-derived materials for HER. 相似文献
2.
Han Hu Jintao Zhang Buyuan Guan Xiong Wen Lou 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2016,128(33):9666-9670
Hybrid hollow nanostructures with tailored shell architectures are attractive for electrochemical energy storage applications. Starting with metal–organic frameworks (MOFs), we demonstrate a facile formation of hybrid nanoboxes with complex shell architecture where a CoSe‐enriched inner shell is intimately confined within a carbon‐enriched outer shell (denoted as CoSe@carbon nanoboxes). The synthesis is realized through manipulation of the template‐engaged reaction between Co‐based zeolitic imidazolate framework (ZIF‐67) nanocubes and Se powder at elevated temperatures. By virtue of the structural and compositional features, these unique CoSe@carbon nanoboxes manifest excellent lithium‐storage performance in terms of high specific capacity, exceptional rate capability, excellent cycling stability, and high initial Coulombic efficiency. 相似文献
3.
Unusual Formation of CoSe@carbon Nanoboxes,which have an Inhomogeneous Shell,for Efficient Lithium Storage 下载免费PDF全文
Dr. Han Hu Jintao Zhang Dr. Buyuan Guan Prof. Xiong Wen Lou 《Angewandte Chemie (International ed. in English)》2016,55(33):9514-9518
Hybrid hollow nanostructures with tailored shell architectures are attractive for electrochemical energy storage applications. Starting with metal–organic frameworks (MOFs), we demonstrate a facile formation of hybrid nanoboxes with complex shell architecture where a CoSe‐enriched inner shell is intimately confined within a carbon‐enriched outer shell (denoted as CoSe@carbon nanoboxes). The synthesis is realized through manipulation of the template‐engaged reaction between Co‐based zeolitic imidazolate framework (ZIF‐67) nanocubes and Se powder at elevated temperatures. By virtue of the structural and compositional features, these unique CoSe@carbon nanoboxes manifest excellent lithium‐storage performance in terms of high specific capacity, exceptional rate capability, excellent cycling stability, and high initial Coulombic efficiency. 相似文献
4.
Hierarchical Hollow Nanoprisms Based on Ultrathin Ni‐Fe Layered Double Hydroxide Nanosheets with Enhanced Electrocatalytic Activity towards Oxygen Evolution 下载免费PDF全文
Dr. Le Yu Jing Fan Yang Dr. Bu Yuan Guan Dr. Yan Lu Prof. Xiong Wen Lou 《Angewandte Chemie (International ed. in English)》2018,57(1):172-176
The oxygen evolution reaction (OER) is involved in various renewable energy systems, such as water‐splitting cells and metal–air batteries. Ni‐Fe layered double hydroxides (LDHs) have been reported as promising OER electrocatalysts in alkaline electrolytes. The rational design of advanced nanostructures for Ni‐Fe LDHs is highly desirable to optimize their electrocatalytic performance. Herein, we report a facile self‐templated strategy for the synthesis of novel hierarchical hollow nanoprisms composed of ultrathin Ni‐Fe LDH nanosheets. Tetragonal nanoprisms of nickel precursors were first synthesized as the self‐sacrificing template. Afterwards, these Ni precursors were consumed during the hydrolysis of iron(II) sulfate for the simultaneous growth of a layer of Ni‐Fe LDH nanosheets on the surface. The resultant Ni‐Fe LDH hollow prisms with large surface areas manifest high electrocatalytic activity towards the OER with low overpotential, small Tafel slope, and remarkable stability. 相似文献
5.
Formation of Nickel Sulfide Nanoframes from Metal–Organic Frameworks with Enhanced Pseudocapacitive and Electrocatalytic Properties 下载免费PDF全文
Dr. Xin‐Yao Yu Le Yu Hao Bin Wu Prof. Xiong Wen Lou 《Angewandte Chemie (International ed. in English)》2015,54(18):5331-5335
Nanoframe‐like hollow structures with unique three‐dimensional (3D) open architecture hold great promise for various applications. Current research efforts mainly focus on frame‐like noble metals and metal oxides. However, metal sulfides with frame‐like nanostructures have been rarely reported. Starting from metal–organic frameworks (MOFs), we demonstrate a novel structure‐induced anisotropic chemical etching/anion exchange method to transform Ni‐Co Prussian blue analogue (PBA) nanocubes into NiS nanoframes with tunable size. The reaction between Ni‐Co PBA nanocube templates and Na2S in solution leads to the formation of well‐defined NiS nanoframes. The different reactivity between the edges and the plane surface of the Ni‐Co PBA nanocubes is found to be the key factor for the formation of NiS nanoframes. Benefitting from their structural merits including 3D open structure, small size of primary nanoparticles, high specific surface area, and good structural robustness, the as‐derived NiS nanoframes manifest excellent electrochemical performance for electrochemical capacitors and hydrogen evolution reaction in alkaline electrolyte. 相似文献
6.
Wei Zhou Dan‐Dan Huang Ya‐Pan Wu Jun Zhao Tao Wu Jian Zhang Dong‐Sheng Li Chenghua Sun Pingyun Feng Xianhui Bu 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2019,131(13):4271-4275
The integration of heterometallic units and nanostructures into metal–organic frameworks (MOFs) used for the oxygen evolution reaction (OER) can enhance the electrocatalytic performance and help elucidate underlying mechanisms. We have synthesized a series of stable MOFs (CTGU‐10a1–d1) based on trinuclear metal carboxylate clusters and a hexadentate carboxylate ligand with a (6,6)‐connected nia net. We also present a strategy to synthesize hierarchical bimetallic MOF nanostructures (CTGU‐10a2–d2). Among these, CTGU‐10c2 is the best material for the OER, with an overpotential of 240 mV at a current density of 10 mA cm?2 and a Tafel slope of 58 mV dec?1. This is superior to RuO2 and confirms CTGU‐10c2 as one of the few known high‐performing pure‐phase MOF‐OER electrocatalysts. Notably, bimetallic CTGU‐10b2 and c2 show an improved OER activity over monometallic CTGU‐10a2 and d2. Both DFT and experiments show that the remarkable OER performance of CTGU‐10c2 is due to the presence of unsaturated metal sites, a hierarchical nanobelt architecture, and the Ni–Co coupling effect. 相似文献
7.
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
8.
Dr. Zhiyu Wang Zi Chen Wang Prof. Srinivasan Madhavi Prof. Xiong Wen Lou 《Chemistry (Weinheim an der Bergstrasse, Germany)》2012,18(24):7561-7567
A versatile one‐step method for the general synthesis of metal oxide hollow nanostructures is demonstrated. This method involves the controlled deposition of metal oxides on shaped α‐Fe2O3 crystals which are simultaneously dissolved. A variety of uniform SnO2 hollow nanostructures, such as nanococoons, nanoboxes, hollow nanorings, and nanospheres, can be readily generated. The method is also applicable to the synthesis of shaped TiO2 hollow nanostructures. As a demonstration of the potential applications of these hollow nanostructures, the lithium storage capability of SnO2 hollow structures is investigated. The results show that such derived SnO2 hollow structures exhibit stable capacity retention of 600–700 mAh g?1 for 50 cycles at a 0.2 C rate and good rate capability at 0.5–1 C, perhaps benefiting from the unique structural characteristics. 相似文献
9.
Molecular Mixed‐Metal Manganese Oxido Cubanes as Precursors to Heterogeneous Oxygen Evolution Catalysts 下载免费PDF全文
Sandy Suseno Dr. Charles C. L. McCrory Dr. Rosalie Tran Dr. Sheraz Gul Dr. Junko Yano Prof. Theodor Agapie 《Chemistry (Weinheim an der Bergstrasse, Germany)》2015,21(38):13420-13430
Well‐defined mixed‐metal [CoMn3O4] and [NiMn3O4] cubane complexes were synthesized and used as precursors for heterogeneous oxygen evolution reaction (OER) electrocatalysts. The discrete clusters were dropcasted onto glassy carbon (GC) and indium tin oxide (ITO) electrodes, and the OER activities of the resulting films were evaluated. The catalytic surfaces were analyzed by various techniques to gain insight into the structure‐function relationships of the electrocatalysts’ heterometallic composition. Depending on preparation conditions, the Co‐Mn oxide was found to change metal composition during catalysis, while the Ni–Mn oxides maintained the NiMn3 ratio. XAS studies provided structural insights indicating that the electrocatalysts are different from the molecular precursors, but that the original NiMn3O4 cubane‐like geometry was maintained in the absence of thermal treatment ( 2‐Ni ). In contrast, the thermally generated 3‐Ni develops an oxide‐like extended structure. Both 2‐Ni and 3‐Ni undergo structural changes upon electrolysis, but they do not convert into the same material. The observed structural motifs in these heterogeneous electrocatalysts are reminiscent of the biological oxygen‐evolving complex in Photosystem II, including the MMn3O4 cubane moiety. The reported studies demonstrate the use of discrete heterometallic oxide clusters as precursors for heterogeneous water oxidation catalysts of novel composition and the distinct behavior of two sets of mixed metal oxides. 相似文献
10.
Yongjin Fang Deyan Luan Ye Chen Shuyan Gao Xiong Wen Lou 《Angewandte Chemie (International ed. in English)》2020,59(7):2644-2648
The construction of hybrid architectures for electrode materials has been demonstrated as an efficient strategy to boost sodium‐storage properties because of the synergetic effect of each component. However, the fabrication of hybrid nanostructures with a rational structure and desired composition for effective sodium storage is still challenging. In this study, an integrated nanostructure composed of copper‐substituted CoS2@CuxS double‐shelled nanoboxes (denoted as Cu‐CoS2@CuxS DSNBs) was synthesized through a rational metal–organic framework (MOF)‐based templating strategy. The unique shell configuration and complex composition endow the Cu‐CoS2@CuxS DSNBs with enhanced electrochemical performance in terms of superior rate capability and stable cyclability. 相似文献
11.
Ultrathin MoS2 Nanosheets Supported on N‐doped Carbon Nanoboxes with Enhanced Lithium Storage and Electrocatalytic Properties 下载免费PDF全文
Dr. Xin‐Yao Yu Dr. Han Hu Yawen Wang Prof. Hongyu Chen Prof. Xiong Wen Lou 《Angewandte Chemie (International ed. in English)》2015,54(25):7395-7398
Molybdenum disulfide (MoS2) has received considerable interest for electrochemical energy storage and conversion. In this work, we have designed and synthesized a unique hybrid hollow structure by growing ultrathin MoS2 nanosheets on N‐doped carbon shells (denoted as C@MoS2 nanoboxes). The N‐doped carbon shells can greatly improve the conductivity of the hybrid structure and effectively prevent the aggregation of MoS2 nanosheets. The ultrathin MoS2 nanosheets could provide more active sites for electrochemical reactions. When evaluated as an anode material for lithium‐ion batteries, these C@MoS2 nanoboxes show high specific capacity of around 1000 mAh g?1, excellent cycling stability up to 200 cycles, and superior rate performance. Moreover, they also show enhanced electrocatalytic activity for the electrochemical hydrogen evolution. 相似文献
12.
基于ZIFs合成的中空双金属(Zn,Co)S纳米晶及其赝电容性质研究 总被引:1,自引:0,他引:1
通过两步法设计合成了具有中空结构的双金属硫化物(Zn,Co)S纳米晶,并研究了其电化学性质.首先在室温下,以水为溶剂,十六烷基三甲基溴化铵为表面活性剂,利用Zn2+,Co2+与2-甲基咪唑的配位作用形成了ZIF-Zn,Co.然后以ZIF-Zn,Co为自牺牲模板剂,加入硫代乙酰胺,在微波辐射下快速合成了具有中空结构的(Zn,Co)S纳米晶.电化学测试结果表明,在电流密度为3 mA/cm2时,(Zn,Co)S纳米晶比电容为423.3 F/g,在电流密度为10 mA/cm2时,充放电2000次,仍能保持59%的初始电容.所制备的中空纳米结构具有较高的比表面积和较好的电化学性能,可作为超级电容器的电极材料. 相似文献
13.
Wang Z Wang ZC Madhavi S Lou XW 《Chemistry (Weinheim an der Bergstrasse, Germany)》2012,18(24):7561-7567
A versatile one-step method for the general synthesis of metal oxide hollow nanostructures is demonstrated. This method involves the controlled deposition of metal oxides on shaped α-Fe(2)O(3) crystals which are simultaneously dissolved. A variety of uniform SnO(2) hollow nanostructures, such as nanococoons, nanoboxes, hollow nanorings, and nanospheres, can be readily generated. The method is also applicable to the synthesis of shaped TiO(2) hollow nanostructures. As a demonstration of the potential applications of these hollow nanostructures, the lithium storage capability of SnO(2) hollow structures is investigated. The results show that such derived SnO(2) hollow structures exhibit stable capacity retention of 600-700?mA h g(-1) for 50?cycles at a 0.2?C rate and good rate capability at 0.5-1?C, perhaps benefiting from the unique structural characteristics. 相似文献
14.
Dr. Yi Huang Dr. Yongjin Fang Dr. Xue Feng Lu Dr. Deyan Luan Prof. Xiong Wen Lou 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2020,132(45):20086-20090
Confining nanostructured electrode materials in porous carbon represents an effective strategy for improving the electrochemical performance of lithium-ion batteries. Herein, we report the design and synthesis of hybrid hollow nanostructures composed of highly dispersed Co3O4 hollow nanoparticles (sub-20 nm) embedded in the mesoporous walls of carbon nanoboxes (denoted as H-Co3O4@MCNBs) as an anode material for lithium-ion batteries. The facile metal–organic framework (MOF)-engaged strategy for the synthesis of H-Co3O4@MCNBs involves chemical etching-coordination and subsequent two-step annealing treatments. Owing to the unique structural merits including more active interfacial sites, effectively alleviated volume variation, good and stable electrical contact, and easy access of Li+ ions, the H-Co3O4@MCNBs exhibit excellent lithium-storage performance in terms of high specific capacity, excellent rate capability, and cycling stability. 相似文献
15.
Junli Wang Dr. Qing Yang Prof. Zude Zhang Shouheng Sun Prof. 《Chemistry (Weinheim an der Bergstrasse, Germany)》2010,16(26):7916-7924
Transition‐metal phosphide nanowires were facilely synthesized by Ullmann‐type reactions between transition metals and triphenylphosphine in vacuum‐sealed tubes at 350–400 °C. The phase (stoichiometry) of the phosphide products is controllable by tuning the metal/PPh3 molar ratio and concentration, reaction temperature and time, and heating rate. Six classes of iron, cobalt, and nickel phosphide (Fe2P, FeP, Co2P, CoP, Ni2P, and NiP2) nanostructures were prepared to demonstrate the general applicability of this new method. The resulting phosphide nanostructures exhibit interesting phase‐ and composition‐dependent magnetic properties, and magnetic measurements suggested that the Co2P nanowires with anti‐PbCl2 structure show a ferromagnetic–paramagnetic transition at 6 K, while the MnP‐structured CoP nanowires are paramagnetic with Curie–Weiss behavior. Moreover, GC‐MS analyses of organic byproducts of the reaction revealed that thermally generated phenyl radicals promoted the formation of transition‐metal phosphides under synthetic conditions. Our work offers a general method for preparing one‐dimensional nanoscale transition‐metal phosphides that are promising for magnetic and electronic applications. 相似文献
16.
Dr. Changzhou Yuan Hao Bin Wu Prof. Yi Xie Prof. Xiong Wen Lou 《Angewandte Chemie (International ed. in English)》2014,53(6):1488-1504
A promising family of mixed transition‐metal oxides (MTMOs) (designated as AxB3‐xO4; A, B=Co, Ni, Zn, Mn, Fe, etc.) with stoichiometric or even non‐stoichiometric compositions, typically in a spinel structure, has recently attracted increasing research interest worldwide. Benefiting from their remarkable electrochemical properties, these MTMOs will play significant roles for low‐cost and environmentally friendly energy storage/conversion technologies. In this Review, we summarize recent research advances in the rational design and efficient synthesis of MTMOs with controlled shapes, sizes, compositions, and micro‐/nanostructures, along with their applications as electrode materials for lithium‐ion batteries and electrochemical capacitors, and efficient electrocatalysts for the oxygen reduction reaction in metal–air batteries and fuel cells. Some future trends and prospects to further develop advanced MTMOs for next‐generation electrochemical energy storage/conversion systems are also presented. 相似文献
17.
Hydrothermal Synthesis of a rGO Nanosheet Enwrapped NiFe Nanoalloy for Superior Electrocatalytic Oxygen Evolution Reactions 下载免费PDF全文
Jing Geng Long Kuai Erjie Kan Yan Sang Prof. Dr. Baoyou Geng 《Chemistry (Weinheim an der Bergstrasse, Germany)》2016,22(41):14480-14483
Graphene‐based hybrid nanostructures possess many advantages in the field of electrochemical energy applications. In this work, a facile and efficient hydrothermal approach has been developed for the preparation of NiFe alloy nanoparticles/rGO hybrid nanostructures, in which the nanoparticles are well combined with rGO nanosheets and the size of the nanoparticles is about 100 nm. Moreover, the electrochemical oxygen evolution reaction (OER) tests confirmed that the obtained NiFe/rGO hybrid nanostructures possess notably higher activity than both the rGO‐free NiFe nanoparticles and pure Ni/rGO hybrids, and the optimal NiFe ratio is 2:1. The OER overpotential at 20 mA cm?1?2 with Ni2Fe/rGO is as low as 0.285 V, which is 96 mV lower than that of pure Ni/rGO hybrids. Meanwhile, the Ni2Fe/rGO catalyst has excellent stability. Therefore, this work contributes a facile and efficient method to prepare a NiFe alloy nanoparticles/rGO hybrid structure for potential applications in the field of electrochemical energy devices, such as electrochemical water splitting cells, rechargeable metal/air batteries, etc. 相似文献
18.
Growth of Hollow Transition Metal (Fe,Co, Ni) Oxide Nanoparticles on Graphene Sheets through Kirkendall Effect as Anodes for High‐Performance Lithium‐Ion Batteries 下载免费PDF全文
Xianbo Yu Bin Qu Yang Zhao Chunyan Li Prof. Yujin Chen Prof. Chunwen Sun Prof. Peng Gao Dr. Chunling Zhu 《Chemistry (Weinheim an der Bergstrasse, Germany)》2016,22(5):1638-1645
A general strategy based on the nanoscale Kirkendall effect has been developed to grow hollow transition metal (Fe, Co or Ni) oxide nanoparticles on graphene sheets. When applied as lithium‐ion battery anodes, these hollow transition metal oxide‐based composites exhibit excellent electrochemical performance, with high reversible capacities and long‐term stabilities at a high current density, superior to most transition metal oxides reported to date. 相似文献
19.
《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2017,129(9):2426-2429
We report a general approach for the synthesis of multishell mixed‐metal oxyphosphide particles. Seven‐layer Mn‐Co oxide particles were first prepared by thermal treatment of Mn‐Co coordination polymer precursors. Afterwards, these multishell Mn‐Co oxide particles were further transformed into multishell Mn‐Co oxyphosphide particles through a phosphidation reaction. This approach is very versatile and can be applied to synthesize other multishell mixed‐metal oxyphosphide particles with different compositions. By applying a constant electrochemical potential, these multishell Mn‐Co oxyphosphide particles can be activated to produce Mn‐Co oxide/hydroxide species in their nanoshells and then show greatly enhanced electrocatalytic activity in the oxygen evolution reaction (OER). 相似文献
20.
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