Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 6, Issue 20, Pages 9420-9427Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8ta01662c
Keywords
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Funding
- National Key Research and Development Program of China [2017YFA0402800]
- National Natural Science Foundation of China [21603207, U1532265, 21533007, 11621063]
- Fundamental Research Funds for the Central Universities [WK2310000054]
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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 metalvacancy 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 NiAl d P 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 1/4 0-14. In particular, the NiAl d P nanowall arrays could achieve an outstanding overall water splitting activity in acidic electrolyte (pH 1/4 0) with high turnover frequencies of similar to 11 000 H2 per h and similar to 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.
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