双金属片
聚磷酸铵
电化学
材料科学
聚磷酸盐
纳米颗粒
兴奋剂
化学工程
多孔性
碳纤维
氢
无机化学
铵
纳米技术
化学
冶金
磷酸盐
复合材料
电极
有机化学
阻燃剂
复合数
物理化学
工程类
金属
光电子学
作者
Lifang Jiao,Yan Liu,Xiao Li,Qing‐Qing Pan,Dan Sun,Linglan Men,Bo Sun,Chunyan Xu,Zhong‐Min Su
标识
DOI:10.1016/j.cej.2021.133696
摘要
• Ammonium polyphosphate as a green phosphorus source is reported for the first time; • The supramolecular precursor is self-assembly by coordination and electrostatic interactions; • MoP/MoNiP@NC exhibits remarkable and stable HER performance; • Density functional theory (DFT) calculation assigns negative P sites as best active sites. Transition metal phosphides (TMPs) have increasingly become the research focus of hydrogen evolution catalysts. In this paper, bimetallic phosphide electrocatalyst ( MoP/MoNiP@NC ) is prepared by predesigned supramolecular gels as precursors via a simple carbonization and phosphorating process, which experience a self-assembly process of ammonium polyphosphate (APP), phosphomolybdic acid hydrate (PMo 12 ), polyaniline (PANI) and Ni 2+ ions via electrostatic and coordination interaction during heating in aqueous solutions. Ammonium polyphosphate as a new phosphorus source with non-toxicity and non-corrosive gas is reported for the first time and exhibits strong coordination ability with metal ions and polyoxometalate. MoP/MoNiP@NC displays satisfactory hydrogen evolution activity with low overpotentials of 94 and 137 mV at 10 mA cm −2 as well as excellent durability for 24 h in 1.0 M KOH and 0.5 M H 2 SO 4 , respectively. It is worth noted that the hydrogen evolution performance of the electrocatalyst is superior to the commercial Pt/C at a current density greater than 80 mA cm −2 under alkaline solution. The remarkable HER activity can be attributed to the synergistic effect of MoNiP and MoP nanoparticles, N-doped porous carbon layers protecting the nanoparticles from corrosion, exposing large amount of active sites and enhancing the mass transfer process. Density functional theory (DFT) calculations illustrate that the best active sites come from the negative P sites of MoNiP nanoparticles. This work provides an environment friendly and reproducible strategy for using APP as a green phosphorus source to synthesize transition metal phosphides as efficient electrocatalysts for energy conversion.
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