Journal
ACS ENERGY LETTERS
Volume 3, Issue 6, Pages 1434-1442Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.8b00584
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Funding
- NSF project - National Science Foundation, Division of Chemical, Bioengineering, Environmental, and Transport Systems (CBET) [CBET-1433401]
- U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, Fuel Cell Technologies Office
- National Science Foundation [CHE-1230246, DMR-1534686]
- Office of Science of the U.S. Department of Energy [DE-AC02-05CH11231]
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Practical application of electrochemical water splitting demands durable, efficient, and non-noble metal catalysts for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). Herein, we report a new hydrogen evolution nanowire electrocatalyst, consisting of S-doped CoWP nanoparticles embedded in S- and N-doped carbon matrix (S-CoWP@(S,N)-C), which is in situ transformed from Hofmann-type (Co, W)-based metal-organic framework (MOF) nanowires. Because of S and N doping to the carbon matrix and the S doping to CoWP nanoparticles, the obtained S-CoWP@(S,N)-C catalyst reaches a current density of -10 mA cm(-2) at -35 and -67 mV (vs RHE) in acidic and alkaline electrolytes, respectively. Powered by a lead halide perovskite solar cell, an unassisted two-electrode solar water-splitting device using MOF-derived S-CoWP@(S,N)-C HER electrocatalysts and S-CoW@(S,N)-C OER electrocatalysts displays a solar-to-hydrogen conversion efficiency of 10.98%. Our method is highly applicable for developing robust electrocatalysts toward efficient and low-cost solar-driven water splitting.
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