Fabrication of Nickel–Cobalt Bimetal Phosphide Nanocages for Enhanced Oxygen Evolution Catalysis

Bocheng Qiu, Lejuan Cai, Yang Wang, Ziyuan Lin, Yunpeng Zuo, Mengye Wang, Yang Chai

Research output: Journal article publicationJournal articleAcademic researchpeer-review

218 Citations (Scopus)

Abstract

Replacement of precious metals with earth-abundant electrocatalysts for oxygen evolution reaction (OER) holds great promise for realizing practically viable water-splitting systems. It still remains a great challenge to develop low-cost, highly efficient, and durable OER catalysts. Here, the composition and morphology of Ni–Co bimetal phosphide nanocages are engineered for a highly efficient and durable OER electrocatalyst. The nanocage structure enlarges the effective specific area and facilitates the contact between catalyst and electrolyte. The as-prepared Ni–Co bimetal phosphide nanocages show superior OER performance compared with Ni 2P and CoP nanocages. By controlling the molar ratio of Ni/Co atoms in Ni–Co bimetal hydroxides, the Ni 0.6Co 1.4P nanocages derived from Ni 0.6Co 1.4(OH) 2 nanocages exhibit remarkable OER catalytic activity (η = 300 mV at 10 mA cm −2) and long-term stability (10 h for continuous test). The density-functional-theory calculations suggest that the appropriate Co doping concentration increases density of states at the Fermi level and makes the d-states more close to Fermi level, giving rise to high charge carrier density and low intermedia adsorption energy than those of Ni 2P and CoP. This work also provides a general approach to optimize the catalysis performance of bimetal compounds.

Original languageEnglish
Article number1706008
JournalAdvanced Functional Materials
Volume28
Issue number17
DOIs
Publication statusPublished - 25 Apr 2018

Keywords

  • bimetal phosphide
  • charge transfer
  • electrocatalysis
  • nanocages
  • oxygen evolution reaction

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Condensed Matter Physics
  • Electrochemistry

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