Li Yang, Du Qi-Xuan, Cui Jian, Yang Hong-Wei, Qian Hua
School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.
China National Quality Inspection Testing Center for Industrial Explosive Materials, Nanjing 210094, China.
Inorg Chem. 2024 Jan 29;63(4):1954-1961. doi: 10.1021/acs.inorgchem.3c03631. Epub 2024 Jan 12.
Cost-effective and earth-abundant oxygen evolution reaction (OER) electrocatalysts are an incredible research hotspot in numerous energy storage and conversion technology fields. Herein, CoS/MoS nanosheets supported by carbon cloth as a dual-active CC@CoS/MoS heterostructure electrocatalyst is prepared through a simple solvothermal method. The catalyst demonstrates admirable OER performance in 1 M KOH solution with a low overpotential of 243 mV at a current density of 10 mA cm and a minor Tafel slope of 109 mV dec, displaying honorable stability after 1000 cyclic voltammetry (CV) cycles and long-term robustness over 60 h. Theoretical calculations further ascertain that the rate-determining step of the electrocatalytic course of the CC@CoS/MoS heterostructure is the conversion *O + OH → *OOH + e with a lower energy barrier of 1.49 eV due to the heterojunction established by CoS and MoS, which can promote the OER performance of electrocatalysts. The actual identification of the catalytic mechanism in the heterostructure is conducive to the improvement of electrocatalysis applications in the OER.
具有成本效益且地球上储量丰富的析氧反应（OER）电催化剂是众多能量存储和转换技术领域中一个令人难以置信的研究热点。在此，通过一种简单的溶剂热法制备了由碳布支撑的CoS/MoS纳米片作为双活性CC@CoS/MoS异质结构电催化剂。该催化剂在1 M KOH溶液中表现出令人钦佩的OER性能，在电流密度为10 mA cm时过电位低至243 mV，塔菲尔斜率为109 mV dec，在1000次循环伏安（CV）循环后表现出良好的稳定性，并在超过60小时内具有长期稳健性。理论计算进一步确定，CC@CoS/MoS异质结构电催化过程的速率决定步骤是*O + OH → *OOH + e的转化，由于CoS和MoS建立的异质结，其能量势垒较低，为1.49 eV，这可以促进电催化剂的OER性能。对异质结构中催化机理的实际识别有利于OER中电催化应用的改进。
