High-performance bifunctional porous non-noble metal phosphide catalyst for overall water splitting

Fang Yu, Haiqing Zhou, Yufeng Huang, Jingying Sun, Fan Qin, Jiming Bao, William A. Goddard, Shuo Chen () and Zhifeng Ren ()
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Fang Yu: University of Houston
Haiqing Zhou: University of Houston
Yufeng Huang: California Institute of Technology
Jingying Sun: University of Houston
Fan Qin: University of Houston
Jiming Bao: University of Houston
William A. Goddard: California Institute of Technology
Shuo Chen: University of Houston
Zhifeng Ren: University of Houston

Nature Communications, 2018, vol. 9, issue 1, 1-9

Abstract: Abstract Water electrolysis is an advanced energy conversion technology to produce hydrogen as a clean and sustainable chemical fuel, which potentially stores the abundant but intermittent renewable energy sources scalably. Since the overall water splitting is an uphill reaction in low efficiency, innovative breakthroughs are desirable to greatly improve the efficiency by rationally designing non-precious metal-based robust bifunctional catalysts for promoting both the cathodic hydrogen evolution and anodic oxygen evolution reactions. We report a hybrid catalyst constructed by iron and dinickel phosphides on nickel foams that drives both the hydrogen and oxygen evolution reactions well in base, and thus substantially expedites overall water splitting at 10 mA cm−2 with 1.42 V, which outperforms the integrated iridium (IV) oxide and platinum couple (1.57 V), and are among the best activities currently. Especially, it delivers 500 mA cm−2 at 1.72 V without decay even after the durability test for 40 h, providing great potential for large-scale applications.

Date: 2018
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DOI: 10.1038/s41467-018-04746-z

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