Journal
CHEMISTRY OF MATERIALS
Volume 27, Issue 22, Pages 7636-7642Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.5b02877
Keywords
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Funding
- Utah State University (USU)
- Ralph E. Powe Junior Faculty Enhancement Award (ORAU)
- Governor's Energy Leadership Scholars Grant of the State of Utah
- Office of Science, Office of Basic Energy Sciences (OBES), Division of Chemical Sciences, Geosciences, and Biosciences of the Department of Energy (DOE) [DE-AC02-05CH11231]
- DOE Office of Biological and Environmental Research
- NIH [P41GM103393]
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [1337932] Funding Source: National Science Foundation
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The design of active, robust, and nonprecious electrocatalysts with both H-2 and O-2 evolution reaction (HER and OER) activities for overall water splitting is highly desirable but remains a grand challenge. Herein, we report a facile two-step method to synthesize porous Co-P/NC nano-polyhedrons composed of CoPx (a mixture of CoP and Co2P) nanoparticles embedded in N-doped carbon matrices as electrocatalysts for overall water splitting. The Co-P/NC catalysts were prepared by direct carbonization of Co-based zeolitic imidazolate framework (ZIF-67) followed by phosphidation. Benefiting from the large specific surface area, controllable pore texture, and high nitrogen content of ZIF (a subclass of metal-organic frameworks), the optimal Co-P/NC showed high specific surface area of 183 m(2) g(-1) and large mesopores, and exhibited remarkable catalytic performance for both HER and OER in 1.0, M KOH, affording a current density of 10 mA cm(-2) at low overpotentials of -154 mV for HER and 319 mV for OER, respectively. Furthermore, a Co-P/NC-based alkaline electrolyzer approached 165 mA cm(-2) at 2.0 V, superior to that of Pt/IrO2 couple, along with strong stability. Various characterization techniques including X-ray absorption spectroscopy (XAS) revealed that the superior activity and strong stability of Co-P/NC originated from its 3D interconnected mesoporosity with high specific surface area, high conductivity, and synergistic effect of CoPx encapsulated within N-doped carbon matrices.
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