| 1 | Constructing heterostructures of ZIF-67 derived C,N doped Co_(2)P and Ti_(2)VC_(2)T_(x)MXene for enhanced OER显示文摘Oxygen evolution reaction(OER)is central to technologies such as electrochemical water splitting,and developing efficient and low-cost non-precious metal electrocatalysts for OER is of great significance to reducing cell voltage and developing hydrogen production by electrochemical water splitting.Herein,we prepared a carbon,nitrogen co-doped porous Co_(2)P derived from the metal-organic framework(ZIF-67),which is anchored on bimetallic MXene nanosheets(named MX@MOF-Co_(2)P).It was used as the OER catalyst and exhibited great electrocatalytic performance with very small overpotentials(246 mV at 10 mA^(-2)and 407 mV at 200 mA cm^(-2))as well as ultralow Tafel slope(28.18 mV dec^(-1)).Combining charac-terizations and theoretical calculations,it was found that the remarkable performance was from follows:the obtained MX@MOF-Co_(2)P inherited the porous structure of the pristine MOF with a large number of open active sites;carbon and nitrogen doping also modulated the electronic structure of the active center;the synergistic effect between cobalt phosphide and MXenes booted the electronic transfer.This work represents a promising strategy for the development of non-precious metal catalysts derived from metal-organic frameworks to achieve efficient energy conversion. | Jinzhou Li Chao Chen Zepeng Lv Wansen Ma Meng Wang Qian Li Jie Dang | 2023 | Journal of Materials Science & Technology2023，，14： | 1 |
| 2 | Interfacial electronic coupling of V-doped Co_(2)P with high-entropy MXene reduces kinetic energy barrier for efficient overall water splitting显示文摘Developing efficient,low-cost non-noble metal-based bifunctional catalysts to achieve excellent hydrogen evolution reaction(HER)and oxygen evolution reaction(OER)kinetics in alkaline media is challenging but very meaningful.However,improving the electronic structure of the catalyst to optimize the adsorption of intermediates and reduce the reaction energy barrier is the key to improve the reaction efficiency.Herein,a V-doped Co_(2)P coupled with high-entropy MXene heterostructure catalyst(V-Co_(2)P@HE)was prepared by a two-step electrodeposition and controlled phosphorization process.The analyses of X-ray absorption spectroscopy,X-ray photoelectron spectroscopy and theoretical calculations jointly show that the introduction of V and the strong electron coupling between the two components optimize the adsorption energy of water molecules and reaction intermediates.Benefiting from the abundant active sites and optimizing intermediate adsorption energy and heterogeneous interface electronic structure,V-Co_(2)P@HE has excellent HER and OER activity and long-term stability under alkaline condition.In particular,when assembled as cathode and anode,the bifunctional V-Co_(2)P@HE catalyst can drive a current density of 10 mA cm^(-2)with only 1.53 V.This work provides new strategies for the application of highentropy MXene and the design of novel non-noble metal-based bifunctional electrolytic water catalysts. | Wansen Ma Zeming Qiu Jinzhou Li Liwen Hu Qian Li Xuewei Lv Jie Dang | 2023 | Journal of Energy Chemistry2023，，10： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员