Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 6, Issue 43, Pages 21445-21451Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8ta08217k
Keywords
-
Funding
- Research Grant Council of Hong Kong [PolyU 152145/15E]
- Hong Kong Polytechnic University [1-ZVGH, G-SB53]
Ask authors/readers for more resources
Cost-effective, highly efficient, and durable catalyst electrodes play a critical role in large-scale water splitting. Although bimetallic phosphides show great potential in electrocatalytic water splitting, the synergistic effect between different active sites has not been investigated to date in detail, which implies lack of an effective strategy to optimize the water splitting performance in a reasonable way. Here werealize robust oxygen evolution (OER) performance with an extremely low overpotential (500 mA cm(-2)@255 mV), low Tafel slope (29.1 mV dec(-1)), and superior stability by controlling the Fe sites on the Ni-Fe-P surface. The prepared OER electrode employs non-noble metal catalysts for superior oxygen evolution performance and meets the requirements of commercial water electrolyzers. In addition, remarkable hydrogen evolution (HER) performance with prominent stability is also achieved by reducing the content of Fe dopant. Our theoretical calculations reveal that improved chemisorption of O-containing intermediates induced by Fe doping contributes to the enhanced OER performance and water molecule chemisorption, which is sensitive to the Fe content, is the primary cause affecting alkaline HER performance. This work highlights controllable water splitting performance on the Ni-Fe-P surface by precisely manipulating the surface active Fe-sites.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available