共查询到18条相似文献,搜索用时 15 毫秒
1.
Garrett C. Lau Nicholas A. Sather Hiroaki Sai Elizabeth M. Waring Elad Deiss‐Yehiely Leonel Barreda Emily A. Beeman Liam C. Palmer Samuel I. Stupp 《Advanced functional materials》2018,28(3)
In energy storage materials, large surface areas and oriented structures are key architecture design features for improving performance through enhanced electrolyte access and efficient electron conduction pathways. Layered hydroxides provide a tunable materials platform with opportunities for achieving such nanostructures via bottom‐up syntheses. These nanostructures, however, can degrade in the presence of the alkaline electrolytes required for their redox‐based energy storage. A layered Co(OH)2–organic hybrid material that forms a hierarchical structure consisting of micrometer‐long, 30 nm diameter tubes with concentric curved layers of Co(OH)2 and 1‐pyrenebutyric acid is reported. The nanotubular structure offers high surface area as well as macroscopic orientation perpendicular to the substrate for efficient electron transfer. Using a comparison with flat films of the same composition, it is demonstrated that the superior performance of the nanotubular films is the result of a large accessible surface area for redox activity. It is found that the organic molecules used to template nanotubular growth also impart stability to the hybrid when present in the alkaline environments necessary for redox function. 相似文献
2.
Energy Storage: Oriented Multiwalled Organic–Co(OH)2 Nanotubes for Energy Storage (Adv. Funct. Mater. 3/2018) 下载免费PDF全文
Garrett C. Lau Nicholas A. Sather Hiroaki Sai Elizabeth M. Waring Elad Deiss‐Yehiely Leonel Barreda Emily A. Beeman Liam C. Palmer Samuel I. Stupp 《Advanced functional materials》2018,28(3)
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Identifying Active Sites of Nitrogen‐Doped Carbon Materials for the CO2 Reduction Reaction 下载免费PDF全文
Song Liu Hongbin Yang Xiang Huang Linghui Liu Weizheng Cai Jiajian Gao Xuning Li Tao Zhang Yanqiang Huang Bin Liu 《Advanced functional materials》2018,28(21)
Nitrogen‐doped carbon materials are proposed as promising electrocatalysts for the carbon dioxide reduction reaction (CRR), which is essential for renewable energy conversion and environmental remediation. Unfortunately, the unclear cognition on the CRR active site (or sites) hinders further development of high‐performance electrocatalysts. Herein, a series of 3D nitrogen‐doped graphene nanoribbon networks (N‐GRW) with tunable nitrogen dopants are designed to unravel the site‐dependent CRR activity/selectivity. The N‐GRW catalyst exhibits superior CO2 electrochemical reduction activity, reaching a specific current of 15.4 A gcatalyst?1 with CO Faradaic efficiency of 87.6% at a mild overpotential of 0.49 V. Based on X‐ray photoelectron spectroscopy measurements, it is experimentally demonstrated that the pyridinic N site in N‐GRW serves as the active site for CRR. In addition, the Gibbs free energy calculated by density functional theory further illustrates the pyridinic N as a more favorable site for the CO2 adsorption, *COOH formation, and *CO removal in CO2 reduction. 相似文献
4.
Yiqun Chen Junru Zhang Jingyi Tian Yue Guo Fengfei Xu Yan Zhang Xizhang Wang Lijun Yang Qiang Wu Zheng Hu 《Advanced functional materials》2023,33(20):2214658
The practical applications of CO2 electroreduction to CO driven by renewable electricity should simultaneously meet the requests of industrial-level CO partial current density (JCO) at least 100 mA cm−2, wide potential window of high CO faradic efficiency (FECO), and low cost. Herein, a new strategy is reported to construct porous hierarchical Ni/N/C single-site catalyst with excellent catalytic activity via coating Ni-containing ZIF-8 on mesostructured basic magnesium carbonate template followed by pyrolysis. The abundant micropores facilitate the formation of numerous edge-hosted Ni-N4 sites with high intrinsic activity, and the interconnected macro/mesopores much promote CO2 delivery and CO release for the full expression of intrinsic activity. Consequently, the catalyst exhibits the industrial-level JCO of 105–462 mA cm−2 at the potential range of −0.6∼−1.3 V with ultra-wide high FECO plateau (>90%@−0.4∼−1.3 V), showing great promise for practical application. This study provides a general synthetic strategy to explore high-performance hierarchical M/N/C electrocatalysts. 相似文献
5.
Jinwang Huang Bo Zhang Shipeng Zhang Yuxiang Zhao Yulong Qian Jinbo Zeng Ling Suo Yue Ma Xinyu Wang Wanzhen Zhang Lulu Song Wu Li 《Advanced functional materials》2023,33(44):2307215
To improve the Li-ion diffusion and extreme-environment performance of LiFePO4 (LFP) lithium-ion batteries, a composite cathode material is fabricated using ultra-fine nano-Mg(OH)2 (MH). First, a flexible confined space is designed in the local area of the cathode surface, through the transition of charged xanthan gum polymer molecules under electric field force and the self-assembly of the xanthan gum network. Then, the 20 nm nano-Mg(OH)2 is prepared through cathodic electrodeposition within the local flexible confined space, and subsequent in situ surface modification as it traverses the xanthan gum network under gravity. LFP-MH significantly changes the density and homogeneity of the cathode electrolyte interphase film and improves the electrolyte affinity. The Li||LFP-MH half-cell demonstrates excellent rate capability (110 mAh g−1 at 5 C) and long-term cycle performance (116.6 mAh g−1 at 1 C after 1000 cycles), and maintains over 100 mAh g−1 after 150 cycles at 60 °C, as well as no structural collapse of the cathode material after 400 cycles at 5 V high cut-off voltage. The cell also shows an obvious decrease in inner resistance after 100 cycles (99.53/133.12 Ω). This work provides a significant advancement toward LiFePO4 lithium-ion batteries with excellent electrochemical performance and tolerance to extreme-environment. 相似文献
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Zhe Li Wen-Jing Kang Hui Liu Xi-Wen Du Fei Wang Yun Song Yang Liu Da-Lin Sun Fang Fang 《Advanced functional materials》2023,33(34):2301947
Various clean energy storage and conversion systems highly depend on rational design of efficient electrocatalysts for oxygen reactions. Increasing both gas molecular diffusion and intrinsic activity is critical to boosting its efficiency for bifunctional oxygen electrocatalysis. However, controllable synthesis of catalysts that combines gas molecular diffusion and intrinsic activity remains a fundamental challenge. Herein, a two-step synthetic strategy is adopted to fabricate a composite oxygen reduction reaction (ORR)/oxygen evolution reaction (OER) bifunctional catalyst (P-Ag-Co(OH)2), of which, atomic Ag is anchored in reactive oxygen atoms around nanopores of Co(OH)2 nanosheets. Abundant nanopores provide enough gas molecular diffusion channels, and the special Ag-O-Co-OH catalytic groups around nanopores display high intrinsic catalytic activity, which jointly result in an excellent ORR/OER performance. In alkaline electrolyte, P-Ag-Co(OH)2 displays a high half-wave potential (0.902 V versus RHE) for ORR, and a low overpotential (235 mV at 10 mA cm−2) for OER, which is superior to non-noble catalysts in previous studies and Pt/C (Ir/C) catalyst. At the same time, the single-cell zinc-air battery is prepared with an extremely high discharge peak power density of 435 mW cm−2 and excellent discharge–charge cycle stability. 相似文献
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Novel Core–Shell FeOF/Ni(OH)2 Hierarchical Nanostructure for All‐Solid‐State Flexible Supercapacitors with Enhanced Performance 下载免费PDF全文
Mengqiao Wang Zhaoqiang Li Chengxiang Wang Ruizheng Zhao Caixia Li Dexiang Guo Luyuan Zhang Longwei Yin 《Advanced functional materials》2017,27(31)
Well‐controlled core–shell hierarchical nanostructures based on oxyfluoride and hydroxide are for the first time rationally designed and synthesized via a simple solvothermal and chemical precipitation route, in which FeOF nanorod acts as core and porous Ni(OH)2 nanosheets as shell. When evaluated as electrodes for supercapacitors, a high specific capacitance of 1452 F g?1 can be obtained at a current density of 1 A g?1. Even as the current density increases to 10 A g?1, the core–shell hybrid still reserves a noticeable capacitance of 1060 F g?1, showing an excellent rate capacity. Furthermore, all‐solid‐state flexible asymmetric supercapacitor based on the FeOF/Ni(OH)2 hybrid as a positive electrode and activated carbon as a negative electrode shows high power density, high energy density, and long cycling lifespan. The excellent electrochemical performance of the FeOF/Ni(OH)2 core–shell hybrid is ascribed to the unique microstructure and synergistic effects. FeOF nanorod from FeF3 by partial substitution of fluorine with oxygen behaves as a low intrinsic resistance, thus facilitating charge transfer processes. While the hierarchical Ni(OH)2 nanosheets with large surface area provide enough active sites for redox chemical reactions, leading to greatly enhanced electrochemical activity. The well‐controllable oxyfluoride/hydroxide hybrid is inspiring, opening up a new way to design new electrodes for next‐generation all‐solid‐state supercapacitors. 相似文献
10.
Electrostatic Self‐Assembly of Nanosized Carbon Nitride Nanosheet onto a Zirconium Metal–Organic Framework for Enhanced Photocatalytic CO2 Reduction 下载免费PDF全文
Li Shi Tao Wang Huabin Zhang Kun Chang Jinhua Ye 《Advanced functional materials》2015,25(33):5360-5367
UiO‐66, a zirconium based metal–organic framework, is incorporated with nanosized carbon nitride nanosheets via a facile electrostatic self‐assembly method. This hybrid structure exhibits a large surface area and strong CO2 capture ability due to the introduction of UiO‐66. We demonstrate that electrons from the photoexcited carbon nitride nanosheet can transfer to UiO‐66, which can substantially suppress electron–hole pair recombination in the carbon nitride nanosheet, as well as supply long‐lived electrons for the reduction of CO2 molecules that are adsorbed in UiO‐66. As a result, the UiO‐66/carbon nitride nanosheet heterogeneous photocatalyst exhibits a much higher photocatalytic activity for the CO2 conversion than that of bare carbon nitride nanosheets. We believe this self‐assembly method can be extended to other carbon nitride nanosheet loaded materials. 相似文献
11.
Heteroatom (N or N‐S)‐Doping Induced Layered and Honeycomb Microstructures of Porous Carbons for CO2 Capture and Energy Applications 下载免费PDF全文
Wenjie Tian Huayang Zhang Hongqi Sun Alexandra Suvorova Martin Saunders Moses Tade Shaobin Wang 《Advanced functional materials》2016,26(47):8651-8661
Increasing global challenges such as climate change, environmental pollution, and energy shortage have stimulated the worldwide explorations into novel and clean materials for their applications in the capture of carbon dioxide, a major greenhouse gas, and toxic pollutants, energy conversion, and storage. In this study, two microstructured carbons, namely N‐doped pillaring layered carbon (NC) and N, S codoped honeycomb carbon (NSC), have been fabricated through a one‐pot pyrolysis process of a mixture containing glucose, sodium bicarbonate, and urea or thiourea. The heteroatom doping is found to induce tailored microstructures featuring highly interconnected pore frameworks, high sp2‐C ratios, and high surface areas. The formation mechanism of the varying pore frameworks is believed to be hydrogen‐bond interactions. NSC displays a similar CO2 adsorption capacity (4.7 mmol g?1 at 0 °C), a better CO2/N2 selectivity, and higher activity in oxygen reduction reaction as compared with NC‐3 (the NC sample with the highest N content of 7.3%). NSC favors an efficient four‐electron reduction pathway and presents better methanol tolerance than Pt/C in alkaline media. The porous carbons also exhibit excellent rate performance as supercapacitors. 相似文献
12.
Qing Zhang Wei Xiao Wan Hui Guo Yu Xian Yang Jing Lei Lei Hong Qun Luo Nian Bing Li 《Advanced functional materials》2021,31(33):2102117
Outstanding electrocatalysts for high-efficiency water splitting demand not only the high intrinsic activity determined by the electronic structure but also a favorable mass transfer (electrolyte diffusion and bubble desorption) and strong structural stability. Here, a 3D core–shell electrocatalyst consisting of Co(OH)2 cavity array-encapsulated NiMo alloy on the flexible carbon cloth substrate (Co(OH)2/NiMo CA@CC) is proposed. Density functional theory reveals that coupling NiMo with Co(OH)2 can better optimize the water adsorption/dissociation and hydrogen adsorption energies in hydrogen evolution reaction, and also accelerate the kinetics of oxygen evolution reaction. Based on this, the open porous structure of the outer Co(OH)2 cavity array further promotes the diffusion of the electrolyte into the heterogeneous interface between NiMo and Co(OH)2, significantly shortening the electron transfer pathways and exposing multiple active sites. In addition, the macroporous array structure accelerates the bubble evolution and desorption process, thus ensuring a rapid mass transfer. When served as bifunctional electrocatalysts toward alkaline overall water splitting, Co(OH)2/NiMo CA@CC delivers a current density of 10 mA cm−2 at a low cell voltage of 1.52 V. Results support the multiscale optimization of the surface/interface engineering induced by the macroporous array. 相似文献
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Porous Carbon: Heteroatom (N or N‐S)‐Doping Induced Layered and Honeycomb Microstructures of Porous Carbons for CO2 Capture and Energy Applications (Adv. Funct. Mater. 47/2016) 下载免费PDF全文
Wenjie Tian Huayang Zhang Hongqi Sun Alexandra Suvorova Martin Saunders Moses Tade Shaobin Wang 《Advanced functional materials》2016,26(47):8650-8650
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Junying He Yanbo Liu Yucheng Huang Hao Li Yuqin Zou Chung-Li Dong Shuangyin Wang 《Advanced functional materials》2021,31(15):2009245
The efficiency of water splitting is largely hindered by the sluggish kinetics of the oxygen evolution reaction. Cobalt-based (oxy)hydroxides are promising electrocatalysts, but their performance is still under the expected goal due to the restricted active sites and intrinsic activity. Herein, Co80Fe20(OH)(OCH3) (CoFeMe) is synthesized with intercalation and rich vacancies by a cation exsolution process in a one-step solve-thermal reaction. With the help of the Fe incorporation, the specific surface area of CoFeMe increases to 101.6 m2 g−1, which is six times that of Co(OH)(OCH3) (CoMe) (16.5 m2 g−1). Also, the induced rich vacancies are traced in the X-ray absorption spectra of CoFeMe. Because of the synergistic effect between the intercalation, Fe incorporation and vacancies, the overpotential of CoFeMe is only 240 mV to drive the current density to 10 mA cm−2, which is reduced 110 mV compared with that of pristine CoMe (350 mV). 相似文献
16.
Carbon Ultramicropores: A New Approach to Tuning Carbon Ultramicropore Size at Sub‐Angstrom Level for Maximizing Specific Capacitance and CO2 Uptake (Adv. Funct. Mater. 44/2016) 下载免费PDF全文
Jin Zhou Zhaohui Li Wei Xing Honglong Shen Xu Bi Tingting Zhu Zhipeng Qiu Shuping Zhuo 《Advanced functional materials》2016,26(44):7945-7945
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Photocatalysis: Evidence and Effect of Photogenerated Charge Transfer for Enhanced Photocatalysis in WO3/TiO2 Heterojunction Films: A Computational and Experimental Study (Adv. Funct. Mater. 18/2017) 下载免费PDF全文
Carlos Sotelo‐Vazquez Raul Quesada‐Cabrera Min Ling David O. Scanlon Andreas Kafizas Pardeep Kumar Thakur Tien‐Lin Lee Alaric Taylor Graeme W. Watson Robert G. Palgrave James R. Durrant Christopher S. Blackman Ivan P. Parkin 《Advanced functional materials》2017,27(18)
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Lithium‐Ion Batteries: Rational Construction of a Functionalized V2O5 Nanosphere/MWCNT Layer‐by‐Layer Nanoarchitecture as Cathode for Enhanced Performance of Lithium‐Ion Batteries (Adv. Funct. Mater. 35/2015) 下载免费PDF全文
Bin Sun Kai Huang Xiang Qi Xiaolin Wei Jianxin Zhong 《Advanced functional materials》2015,25(35):5716-5716