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In situ embedding of Mo2C/MoO3-x nanoparticles within a carbonized wood membrane as a self-supported pH-compatible
Fang Wang1, Wanan Deng1, Yanan Li1
1School of Chemistry and Chemical Engineering, Key Laboratory of Electrochemical Energy Conversion Technology and Application, North Minzu University, Yinchuan, 750021, P. R. China. sxmin@nun.edu.cn and Key Laboratory of Chemical Engineering and Technology, State Ethnic Affairs Commission, North Minzu University, Yinchuan, 750021, P. R. China and Ningxia Key Laboratory of Solar Chemical Conversion Technology, North Minzu University, Yinchuan 750021, P. R. China.
Abstract:
A rational design of active, stable, and pH-compatible electrocatalysts is crucial to produce high-purity H2via an electrocatalytic water splitting reaction. Herein, we report a carbonized wood membrane (CWM) embedded with Mo2C/MoO3-x nanoparticles (denoted as MCWM) as an efficient and stable self-supported H2 evolution cathode in both acidic and alkaline solutions. The CWM features a high surface area with numerous aligned and open channels and abundant porosity, greatly facilitating electrolyte transport and gas release. The in situ embedded Mo2C/MoO3-x nanoparticles are uniformly dispersed throughout the entire framework of the CWM, providing abundant active sites. These structural synergies endow the as-fabricated MCWM electrodes with excellent electrocatalytic H2 evolution activity, and the optimal MCWM electrode requires overpotentials of 187 and 275 mV to achieve a current density of 10 mA cm-2 in 0.5 M H2SO4 and 1.0 M KOH, respectively. Moreover, the MCWM electrode exhibits superior H2 evolution stability at a high current density of 80 mA cm-2 in both solutions with nearly 100% faradaic efficiencies. This work provides a promising nature-inspired strategy for the development of self-supported and pH-compatible electrodes for large-scale electrocatalytic H2 evolution reactions.
