Yan Zhenwei, Guo Shuaihui, Li Chuanbin, Tan Zhaojun, Wang Lijun, Wang Wen, Li Gang, Liu Yanyan, Zhang Huanhuan, Tang Mingqi, Feng Zaiqiang, Wang Yongfeng, Li Baojun
School of Mechanical Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450011, PR China.
School of Mechanical Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450011, PR China.
J Colloid Interface Sci. 2024 Nov 15;674:823-833. doi: 10.1016/j.jcis.2024.06.194. Epub 2024 Jun 26.
Designing and developing suitable oxygen evolution reaction (OER) catalysts with high activity and stability remain challenging in electrolytic water splitting. Hence, NiFe@NC@MoS core-bishell composites wrapped by molybdenum disulphide (MoS) and nitrogen-doped graphene (NC) were prepared using hydrothermal synthesis in this research. NiFe@NC@MoS composite exhibits excellent performance with an overpotential of 288 mV and a Tafel slope of 53.2 mV·dec at a current density of 10 mA·cm in 1 M KOH solution, which is superior to commercial RuO. NC and MoS bishells create profuse edge active sites that enhance the adsorption ability of OOH* while lowering the overall overpotential of the product and improving its oxygen precipitation performance. The density function theory(DFT) analysis confirms that the layered MoS in NiFe@NC@MoS provides additional edge active sites and enhances electron transfer, thus increasing the intrinsic catalytic activity. This research paves a novel way for developing OER electrocatalysts with excellent catalytic performance.
在电解水分解中，设计和开发具有高活性和稳定性的合适析氧反应（OER）催化剂仍然具有挑战性。因此，本研究采用水热合成法制备了由二硫化钼（MoS）和氮掺杂石墨烯（NC）包裹的NiFe@NC@MoS核-双壳复合材料。在1 M KOH溶液中，NiFe@NC@MoS复合材料在电流密度为10 mA·cm时表现出优异的性能，过电位为288 mV，塔菲尔斜率为53.2 mV·dec，优于商业RuO。NC和MoS双壳层产生大量边缘活性位点，增强了OOH*的吸附能力，同时降低了产物的整体过电位并提高了其析氧性能。密度泛函理论（DFT）分析证实NiFe@NC@MoS中的层状MoS提供了额外的边缘活性位点并增强了电子转移，从而提高了本征催化活性。本研究为开发具有优异催化性能的OER电催化剂开辟了一条新途径。
