期刊
ACS APPLIED MATERIALS & INTERFACES
卷 9, 期 13, 页码 11642-11650出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b01037
关键词
nickel phosphide; hierarchical pores; metal organic frameworks; hydrogen evolution reaction; electrocatalyst
资金
- National Natural Science Foundation of China [21473254, 21401215]
- Special Project Fund of Taishan Scholar of Shandong Province [ts201511017]
The development of highly active and stable noble metal-free electrocatalysts of hydrogen evolution reaction (HER) under both acidic and basic conditions for renewable-energy conversion techniques is of great significance. Herein, a practical in situ synthesis strategy for a three-dimensional Ni2P polyhedron with a hierarchically porous structure was presented, which was efficiently obtained from a nickel centered metal-organic frameworks (MOF-74-Ni) by direct low-temperature phosphorization. The as-prepared Ni2P polyhedron showed a high BET surface area (175.0 m(2)center dot g-1), hierarchically porous property, and outstanding metal dispersion, which well inherited the morphology and porosity of its MOF precursor. Compared with Ni2P particles obtained from a nonporous precursor, the as-prepared Ni2P polyhedron used as electrocatalyst exhibited excellent electrocatalytic performance toward the HER, with a low overpotential of 158 mV to produce the cathodic current density of 10 mA cm(-2). A small Tafel slope of 73 mV per decade is obtained for Ni2P polyhedron, which revealed a Volmer-Heyrovsky mechanism during the HER. In addition, benefiting from the structural stability, the porous Ni2P polyhedron used as a electrocatalyst showed satisfactory long-term durability for the HER in acidic media.
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