title: In Situ Synthesis Strategy for Hierarchically Porous Ni2P Polyhedrons from MOFs Templates with Enhanced Electrochemical Properties for Hydrogen Evolution.
abstract: 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 m2·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.
authors.affiliation: Research Centre of New Energy Science and Technology, Research Institute of Unconventional Oil & Gas and Renewable Energy, and ‡College of Science, China University of Petroleum (East China) , Qingdao 266580, P. R. China.
authors.forename: Liting
authors.identifier: http://orcid.org/0000-0002-3600-0323
authors.initials: L
authors.lastname: Yan
authors.affiliation: Research Centre of New Energy Science and Technology, Research Institute of Unconventional Oil & Gas and Renewable Energy, and ‡College of Science, China University of Petroleum (East China) , Qingdao 266580, P. R. China.
authors.forename: Pengcheng
authors.initials: P
authors.lastname: Dai
authors.affiliation: Research Centre of New Energy Science and Technology, Research Institute of Unconventional Oil & Gas and Renewable Energy, and ‡College of Science, China University of Petroleum (East China) , Qingdao 266580, P. R. China.
authors.forename: Ying
authors.initials: Y
authors.lastname: Wang
authors.affiliation: Research Centre of New Energy Science and Technology, Research Institute of Unconventional Oil & Gas and Renewable Energy, and ‡College of Science, China University of Petroleum (East China) , Qingdao 266580, P. R. China.
authors.forename: Xin
authors.initials: X
authors.lastname: Gu
authors.affiliation: Research Centre of New Energy Science and Technology, Research Institute of Unconventional Oil & Gas and Renewable Energy, and ‡College of Science, China University of Petroleum (East China) , Qingdao 266580, P. R. China.
authors.forename: Liangjun
authors.identifier: http://orcid.org/0000-0001-9370-4995
authors.initials: L
authors.lastname: Li
authors.affiliation: Research Centre of New Energy Science and Technology, Research Institute of Unconventional Oil & Gas and Renewable Energy, and ‡College of Science, China University of Petroleum (East China) , Qingdao 266580, P. R. China.
authors.forename: Lei
authors.initials: L
authors.lastname: Cao
authors.affiliation: Research Centre of New Energy Science and Technology, Research Institute of Unconventional Oil & Gas and Renewable Energy, and ‡College of Science, China University of Petroleum (East China) , Qingdao 266580, P. R. China.
authors.forename: Xuebo
authors.initials: X
authors.lastname: Zhao
keywords: electrocatalyst; hierarchical pores; hydrogen evolution reaction; metal−organic frameworks; nickel phosphide