Self-supporting sandwich-structured Co–Pt–Co/CC electrocatalysts for high effective hydrogen production by electrolysis of water in alkaline solution. (12th January 2023)

• Record Type: Journal Article
• Authors: Liu, Wenqian; Tang, Yang; Liu, Fan; Gao, Li; Yang, Daxiang; Yang, Jingang; Bao, Shu-Juan
• Is Part Of: International journal of hydrogen energy. Volume 48:Number 4(2023)
• Page Start: 1255
• Page End: 1262
• Publication Date: 2023-01-12
• Subjects: Hydrogen evolution reaction (HER) -- Transition metal catalyst -- Co-based catalysts -- Sandwich-like structure -- Electrodeposition -- Chemical displacement; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2022.10.003
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: Trace precious metal modifying inexpensive transition metal catalyst is an effective method to optimize the activity, stability and cost of hydrogen evolution catalysts. In this feature work, self-supporting sandwich structured Co–Pt–Co/CC sheets were assembled on a carbon cloth (CC) by a simple electrodeposition/chemical displacement alternate growth method. Surprisingly, only 2.1 wt % Pt sandwich layer greatly improved the electrochemical activity of Co–Pt–Co/CC, which delivered a current density of 10 mA cm −2 at an overpotential as low as 46 mV. Importantly, its overpotential is almost 6 times lower than that of Co/CC, and is comparable to that of Pt–Co/CC. After well-tuning the sandwich layer, the optimized Co–Pt–Co/CC exhibited a higher current density and better long-term durability compared with Pt–Co/CC and Co/CC, which can be attributed to the unique tissue-structure and electronic structure optimization of the Co–Pt–Co/CC by the Pt sandwich layer. Graphical abstract: Image 1 Highlights: Doping trace Pt into the sandwich-like structured Co–Pt–Co/CC can significantly improve its HER performance. The sandwich like self-supporting electrode can easily be prepared by alternating electrodeposition and impregnation. The good hydrophilicity of Co–Pt–Co/CC surface can rapidly divert H2 gas bubbles.