纳米点
纳米笼
材料科学
碳化
贵金属
纳米材料基催化剂
催化作用
制氢
化学工程
过渡金属
热解
纳米颗粒
电化学
碳纤维
纳米技术
分解水
金属
光催化
化学
复合数
有机化学
电极
冶金
物理化学
工程类
复合材料
扫描电子显微镜
作者
Qianqian Du,Ruihua Zhao,Tianyu Guo,Lu Liu,Xiaojun Chen,Jie Zhang,Jianping Du,Jinping Li,Liqiang Mai,Tewodros Asefa
出处
期刊:Small methods
[Wiley]
日期:2021-09-17
卷期号:5 (11): 2100334-2100334
被引量:20
标识
DOI:10.1002/smtd.202100334
摘要
The production of hydrogen via electrochemical water splitting has the potential to enable the utilization of hydrogen-powered fuel cells on a large scale. However, to realize this technology, inexpensive, noble metal-free electrocatalysts possessing high performances for the hydrogen evolution reaction (HER) are needed. Mo2C nanoparticles recently receive much attention as alternative noble metal-free electrocatalysts because their electronic structures are akin to that of Pt. However, the synthesis of Mo2C at nanoscale with high catalytic activity for HER remains a great challenge. Moreover, although efforts have been made to prevent their aggregation, the particles coalesce during high temperature carbonization, which is typically used to produce such transition metal carbides. Here, the synthesis of Mo2C nanodots that are well-dispersed within 3D cage-like carbon microparticles using rationally designed Mo-based xerogels, which are prepared via the sol–gel process as precursors, is reported. During their pyrolysis, the xerogels maintain their structures while the Mo species in them transform into well-dispersed Mo2C nanodots in situ. The as-synthesized Mo2C nanodots exhibit excellent electrocatalytic activity for HER, in both alkaline and acidic media, while remaining largely stable. The work also demonstrates a promising synthetic route and procedure to other well-dispersed yet stable nanocatalysts.
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