电催化剂
碳化物
氮化物
石墨氮化碳
无机化学
催化作用
钼
化学
异质结
材料科学
杂原子
氢
化学工程
冶金
纳米技术
电化学
光催化
电极
有机化学
物理化学
图层(电子)
工程类
戒指(化学)
光电子学
作者
Peng Zuo,Xujing Ji,Weizhou Jiao,Ruixin Wang
标识
DOI:10.1016/j.jallcom.2022.166553
摘要
Herein, the ultrafine molybdenum carbide/nitride (Mo2C/Mo2N) heterojunction loaded by nitrogen (N), phosphorus (P)-codoped carbon matrix with hierarchical porous (PNC) is prepared in-situ by fabricating the ternary complex of silica (SiO2) nanoparticles, chitosan (CS) and phosphomolybdic acid (PMo12) as precursor, followed by annealing and hydrofluoric acid (HF) etching. Due to the excellent structural characteristics of the optimized catalyst Mo2C/Mo2[email protected], including the Mo2C/Mo2N heterojunction and its uniform dispersion in PNC, P-doping in Mo2C/Mo2N, Mo vacancies, the strong interface coupling between Mo2C/Mo2N heterojunctions and PNC, as well as the connected macroporous channels and hierarchical porous structure, etc., not only large numbers of active sites are exposed, but also the electron density distribution around Mo atoms is tuned. Therefore, the charge/mass transport is greatly improved, resulting in the more superior hydrogen evolution activity of Mo2C/Mo2[email protected] than that of the single-phased Mo2C or Mo2N counterpart, with lower overpotentials of 62 or 97 mV to achieve10 mA cm−2 in alkaline or acidic solution, respectively. Moreover, Mo2C/Mo2[email protected] still shows excellent long-term durability. This study opens up a new idea for designing highly efficient electrocatalysts via integrating heterojunction, defects, heteroatom doping, and hierarchical porous structure.
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