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Issue 20, 2018
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A metal-vacancy-solid-solution NiAlP nanowall array bifunctional electrocatalyst for exceptional all-pH overall water splitting

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Abstract

The development of active and durable bifunctional electrocatalysts for overall water splitting in a wide pH range is highly desirable for industrial water electrolysis. Herein, we develop a new type of 3D metal-vacancy solid-solution NiAlP nanowall array synthesized by a combination of selective alkali-etching and phosphorization strategies as a highly-active and earth-abundant all-pH bifunctional electrocatalyst for efficient overall water splitting. These metal-vacancy NiAlδP nanowall arrays as both the anode and cathode are highly efficient in overall-water-splitting catalysis, realizing 10 mA cm−2 at quite low cell voltages of 1.50–1.70 V for pH = 0–14. In particular, the NiAlδP nanowall arrays could achieve an outstanding overall water splitting activity in acidic electrolyte (pH = 0) with high turnover frequencies of ∼11 000 H2 per h and ∼5000 O2 per h at 50 and 300 mV overpotentials for the HER and OER, respectively, far exceeding those of the best noble-metal-free catalysts and the Pt/C–RuO2 combination.

Graphical abstract: A metal-vacancy-solid-solution NiAlP nanowall array bifunctional electrocatalyst for exceptional all-pH overall water splitting

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Publication details

The article was received on 19 Feb 2018, accepted on 28 Mar 2018 and first published on 29 Mar 2018


Article type: Paper
DOI: 10.1039/C8TA01662C
Citation: J. Mater. Chem. A, 2018,6, 9420-9427
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    A metal-vacancy-solid-solution NiAlP nanowall array bifunctional electrocatalyst for exceptional all-pH overall water splitting

    W. Cheng, H. Zhang, X. Zhao, H. Su, F. Tang, J. Tian and Q. Liu, J. Mater. Chem. A, 2018, 6, 9420
    DOI: 10.1039/C8TA01662C

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