期刊
NANO RESEARCH
卷 15, 期 1, 页码 238-247出版社
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-021-3465-1
关键词
overall water splitting; MXene; Co-CoO; heterojunction; electrocatalysis
类别
资金
- National Key R&D Program of China [2018YFB1502401]
- National Natural Science Foundation of China [21631004, 21805073, U20A20250, 21901064]
- Natural Science Foundation of Heilongjiang Province [QC2018014]
- University Nursing Program for Young Scholars with Creative Talents in Heilongjiang Province [UNPYSCT-2017123, UNPYSCT-2017124]
- Basic Research fund of Heilongjiang University in Heilongjiang Province [RCYJTD201801]
- Heilongjiang University Excellent Youth Foundation
The development of cost-effective and efficient catalysts for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is crucial for practical water splitting. In this study, a novel bifunctional HER/OER electrocatalyst was proposed by coupling a Co-based heterojunction with Ti3C2-MXene, showing excellent activity and stability. The catalyst demonstrated low onset potential and high Faradaic efficiency, making it ideal for consecutive production of hydrogen and oxygen gases using solar cell power.
Development of cost-effective and highly-efficient bifunctional hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) catalysts is crucial for overall water splitting in practical utilization. Herein, we proposed a novel non-noble metal bifunctional HER/OER electrocatalyst by synergistically coupling a dual-active Co-based heterojunction (Co-CoO) with high conductive and stable two-dimensional Ti3C2-MXene (defined as Co-CoO/Ti3C2-MXene). A series of characterizations and theoretical calculations verify that the synergistic effect of metallic Co with HER activity and CoO with OER performance leads to superb bifunctional catalytic performance, and Ti3C2-MXene can enhance electrical conductivity and prevent the aggregation of the Co-based catalysts, thereby improving both the activity and stability. Co-CoO/Ti3C2-MXene presents low onset potential (eta(onset)) of 8 mV and Tafel slope of 47 mV.dec(-1 )for HER (close to that of PVC) and eta(onset) of 196 mV and Tafel slope of 47 mV.dec(-1) for OER (superior to that of RuO2). Assembled as an electrolyzer, Co-CoO/Ti3C2-MXene shows a low voltage of 1.55 V at 10 mA.cm(-2), high Faradaic efficiency and remarkable stability. It can be driven by a solar cell of similar to 1.55 V for consecutive production of hydrogen and oxygen gases.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据