Constructing Ni-Modified Co-FcDA nanosheets for enhancing electrocatalytic oxygen evolution reaction. (1st October 2022)

• Record Type: Journal Article
• Authors: Xie, Wenshuo; Hu, Junbo; Deng, Wei; Li, Dan; Gai, Yuping; Li, Xiang; Zhang, Jingjing; Long, Dewu; Qiao, Shanlin; Jiang, Fei
• Is Part Of: International journal of hydrogen energy. Volume 47:Number 83(2022)
• Page Start: 35215
• Page End: 35226
• Publication Date: 2022-10-01
• Subjects: MOF nanosheets -- Single Ni -- Oxygen evolution reaction -- Electrocatalysts -- Oxygen defect; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2022.08.109
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: Electrocatalytic water splitting is an emerging technology for the development of maintainable hydrogen energy. It remains challenging to manufacture a stable, efficient, and cost-effective electrocatalyst that can conquer the slow reaction kinetics of water electrolysis. Herein, A metal-organic framework (MOF) based material is manufactured and productively catalyze the oxygen evolution reaction (OER). The introduction of elemental nickel enhances the catalytic activity of Co-FcDA. The results show that single Ni was well doped in the CoNi-FcDA catalysts and the doping of Ni has a great influence on the OER activity of CoNi-FcDA catalysts. CoNi-FcDA displayed a low overpotential of 241 mV to arrive at the benchmark current density (10 mA cm −2 ) with a remarkably small Tafel slope of 78.63 mV dec −1 . It surpassed the state-of-the-art electrocatalyst for OER, that is, RuO2 (260 mV and 97.26 mV dec −1 ) in efficiency as well as instability. Density functional theory (DFT) calculations show that suitable Ni doping at the same time can increase the density of states of the Fermi level, resulting in excellent charge density and low intermediate adsorption energy. These discoveries provide a practical route for designing 2D polymetallic nanosheets to optimize catalytic OER performance. Highlights: Elemental Ni is doped and enhances the catalytic activity of Co-FcDA through one pot solvothermal reaction. The OER overpotentials of CoNi-FcDA at 10 mA cm −2 only required 251 mV. CoNi-FcDA increases the DOS of the Fermi level, which produce charge density and low intermediate adsorption energy.