Self‐catalyzed formation of strongly interconnected multiphase molybdenum‐based composites for efficient hydrogen evolution

Carbon Energy

卷:4

Jie Yu¹  Sixuan She²  Haijuan Zhang²  Jiani Chen²  Daqin Guan²  Wei Zhou²  Zongping Shao² 

[1] Department of Building and Real Estate, Building Energy Research Group The Hong Kong Polytechnic University Hong Kong China;

[2] State Key Laboratory of Materials‐Oriented Chemical Engineering, College of Chemical Engineering Nanjing Tech University Nanjing China;

关键词: hydrogen‐binding energy;    hydrogen evolution reaction;    molybdenum carbide;    phase transition;    self‐catalysis;   

DOI  :  10.1002/cey2.156

来源: DOAJ

【 摘 要 】

Abstract Molybdenum carbide (MoxC) with variable phase structure possesses flexible hydrogen‐binding energy (HBE), which is a promising hydrogen evolution reaction (HER) catalyst. Herein, a hybrid multiphase MoxC freestanding film coupled with Co3Mo (CM/MoxC@NC) is synthesized through the electrospinning method supplemented by the heteroatom incorporation. CM/MoxC@NC surpasses its pure phase counterparts and exhibits remarkable catalytic activity at 114 mV to deliver a current density of 10 mA cm−2 in acid, which is among the first‐rate level performance reported for MoxC‐based catalysts. The subsequent ex situ and in situ characterizations reveal a phase transition mechanism based on self‐catalysis that CoOx depletes the coordinated C of α‐MoC via the interaction, which realizes the assembly of weak HBE α‐MoC and strong HBE β‐Mo2C, and the enhanced utilization of active materials as well. The multiple structures with optimal HBE are in favor of the stepwise reactions of HER, as the study of the correlation between HBE and phase structure revealed. This study discloses the underlying phase transition mechanism and highlights the HBE–structure relationship that should be considered for catalyst design.

【 授权许可】

Unknown