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Iron Doping Effect for Oxygen Evolution Hybrid Catalysts based on Nickel Phosphate/Nitrogen‐Doped Carbon Nanoflakes
Author(s) -
Cheng Xian,
Zheng Jianfeng,
Li Jintang,
Luo Xuetao
Publication year - 2019
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201900203
Subject(s) - overpotential , catalysis , tafel equation , oxygen evolution , carbon fibers , materials science , nickel , inorganic chemistry , bimetal , chemical engineering , chemistry , electrochemistry , electrode , metallurgy , composite number , organic chemistry , composite material , engineering
Developing highly ecient and earth‐abundant oxygen evolution reaction (OER) electrocatalysts is of great significance for sustainable energy conversion technologies. Herein, a facile thermal transformation strategy was developed to synthesize nickel iron phosphate nanoparticles incorporated in N‐doped carbon (NiFeP/N−C) nanoflakes as highly efficient OER electrocatalysts based on a metal organophosphonate precursor. The amino trismethylene phosphonic acid ligand used here has excellent affinity toward various metals and thus can act as a P, C, and N source on a molecular scale, which simplifies the synthesis of conductive material‐supported multi‐metal phosphates. Benefiting from the derived N‐doped carbon and the synergistic effect of bimetal ions, the sample denoted NiFeP/N−C‐700 exhibits outstanding electrocatalytic activity. It exhibits a lower overpotential of 280 mV, a small Tafel slope of 48 mV dec −1 at a current density of 10 mA/cm 2 , and superior stability in 1 M KOH solution.