期刊
SMALL
卷 17, 期 17, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.202007557
关键词
electrocatalysis; heterostructure; hydrogen generation; interface engineering; transition metal phosphide
类别
资金
- Science and Technology Development Fund from Macau SAR (FDCT) [0102/2019/A2, 0035/2019/AGJ, 0154/2019/A3, 0033/2019/AMJ, 0081/2019/AMJ]
- University of Macau [MYRG2018-00003-IAPME]
- Natural Science Foundation of China [91733302, 61935017]
This study presents a 3D porous hierarchical CoNiP/CoxP multi-phase heterostructure on Ni foam via electrodeposition and phosphorization, showing ultra-high catalytic activity for HER. The optimized structure exhibits exceptional performance and stability, providing insights for designing cost-effective electrocatalysts with superior HER activity.
Hydrogen evolution reaction (HER) is a key step for electrochemical energy conversion and storage. Developing well defined nanostructures as noble-metal-free electrocatalysts for HER is promising for the application of hydrogen technology. Herein, it is reported that 3D porous hierarchical CoNiP/CoxP multi-phase heterostructure on Ni foam via an electrodeposition method followed by phosphorization exhibits ultra-highly catalytic activity for HER. The optimized CoNiP/CoxP multi-phase heterostructure achieves an excellent HER performance with an ultralow overpotential of 36 mV at 10 mA cm(-2), superior to commercial Pt/C. Importantly, the multi-phase heterostructure shows exceptional stability as confirmed by the long-term potential cycles (30,000 cycles) and extended electrocatalysis (up to 500 h) in alkaline solution and natural seawater. Experimental characterizations and DFT calculations demonstrate that the strong electronic interaction at the heterointerface of CoNiP/CoP is achieved via the electron transfer from CoNiP to the heterointerface, which directly promotes the dissociation of water at heterointerface and desorption of hydrogen on CoNiP. These findings may provide deep understanding on the HER mechanism of heterostructure electrocatalysts and guidance on the design of earth-abundant, cost-effective electrocatalysts with superior HER activity for practical applications.
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