Journal
ACS CATALYSIS
Volume 5, Issue 11, Pages 6355-6361Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.5b01657
Keywords
hydrogen evolution reaction (HER); nickel diphosphide (NiP2); nickel diselenide (NiSe2); electrocatalysis; doping; pyrite phase
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Funding
- U.S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering [DE-FG02-09ER46664]
- UW-Madison H. I. Romnes Faculty Fellowship
- China Scholarship Council (CSC)
- NSF Graduate Research Fellowship
- National Natural Science Foundation of China [21275010]
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The study of efficient, robust, and earth-abundant electrocatalysts for the hydrogen evolution reaction (HER) is essential for hydrogen-based energy technologies. Previous works have demonstrated that pyrite-structure materials (e.g., CoS2, NiSe2) are efficient HER catalysts. Here, we first systematically investigate the nanostructure synthesis of a series of pyrite-phase nickel phosphoselenide materials-NiP2, Se-doped NiP2 (NiP1.93Se0.07), P-doped NiSe2 (NiP0.09Se1.91), and NiSe2-through a facile thermal conversion of Ni(OH)(2) nanoflakes. The similar nanostructures enable a systematic and fair comparison of their structural properties and catalytic activities for HER We found that NiP1.93Se0.07 shows the best HER performance, followed by NiP2, NiP0.09Se1.91, and NiSe2. Se-doped NiP2 grown on carbon fiber paper can achieve an electrocatalytic current density of 10 mA cm(-2) at an overpotential as low as 84 mV and a small Tafel slope of 41 mV decade(-1). This study not only estabilishes Se-doped NiP2 as a competitive HER catalyst, but also demonstrates that doping or alloying of developed catalysts (especially doping with anions from another group; e.g., selenium to phosphorus) can improve the HER catalytic activity, which provides a general strategy to improve catalytic efficiencies of existing electrocatalysts for HER.
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