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Active Site Engineering of Fe- and Ni-sites for Highly Efficient Electrochemical Overall Water Splitting

Abstract

Cost-effective, highly efficient, and durable catalyst electrodes play a critical role towards large-scale water splitting. Although bimetallic phosphides show great potential in electrocatalytic water splitting, the synergistic effect between different active sites has not been detailed investigated to date, which implies lack of effective strategy to optimize the water splitting performance in a reasonable way. Here we realize robust oxygen evolution (OER) performance with an extremely low overpotential (500 mA/cm2 @ 255 mV), low Tafel slope (29.1 mV dec−1), and superior stability by controlling the Fe sites in Ni-Fe-P surface. The prepared OER electrode exhibit superior non-noble metal catalysts for oxygen evolution and meets the commercial water electrolyzer requirements. 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 O-containing intermediates chemisorption 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 to affect alkaline HER performance. This work highlights the the controllable water splitting performance on Ni-Fe-P surface by precisely manipulating the surface active Fe-sites.

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Publication details

The article was received on 23 Aug 2018, accepted on 12 Oct 2018 and first published on 12 Oct 2018


Article type: Paper
DOI: 10.1039/C8TA08217K
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Active Site Engineering of Fe- and Ni-sites for Highly Efficient Electrochemical Overall Water Splitting

    L. Cai, B. Qiu, Z. Lin , Y. Wang, S. Ma, M. Wang, Y. H. Tsang and Y. Chai, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA08217K

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