4.7 Article

Synergistic effect of metallic nickel and cobalt oxides with nitrogen-doped carbon nanospheres for highly efficient oxygen evolution

Journal

CHINESE JOURNAL OF CATALYSIS
Volume 41, Issue 11, Pages 1782-1789

Publisher

ELSEVIER
DOI: 10.1016/S1872-2067(20)63621-X

Keywords

Ni/Co3O4@NC; N-doped carbon; Electrocatalyst; Synergistic effect; Oxygen evolution reaction

Funding

  1. Shandong Provincial Natural Science Foundation [ZR2017MB059]
  2. National Natural Science Foundation of China [21776314]
  3. Fundamental Research Funds for the Central Universities [18CX05016A]
  4. Postgraduate Innovation Project of China University of Petroleum [YCX2019096]

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The most energy-inefficient step in the oxygen evolution reaction (OER), which involves a complicated four-electron transfer process, limits the efficiency of the electrochemical water splitting. Here, well-defined Ni/Co3O4 nanoparticles coupled with N-doped carbon hybrids (Ni/Co3O4@NC) were synthesized via a facile impregnation-calcination method as efficient electrocatalysts for OER in alkaline media. Notably, the impregnation of the polymer with Ni and Co ions in the first step ensured the homogeneous distribution of metals, thus guaranteeing the subsequent in situ calcination reaction, which produced well-dispersed Ni and Co3O4 nanoparticles. Moreover, the N-doped carbon matrix formed at high temperatures could effectively prevent the aggregation and coalescence, and regulate the electronic configuration of active species. Benefiting from the synergistic effect between the Ni, Co3O4, and NC species, the obtained Ni/Co3O4@NC hybrids exhibited enhanced OER activities and remarkable stability in an alkaline solution with a smaller overpotential of 350 mV to afford 10 mA cm(-2), lower Tafel slope of 52.27 mV dec(-1), smaller charge-transfer resistance, and higher double-layer capacitance of 25.53 mF cm(-2) compared to those of unary Co3O4@NC or Ni@NC metal hybrids. Therefore, this paper presents a facile strategy for designing other heteroatom-doped oxides coupled with ideal carbon materials as electrocatalysts for the OER. (c) 2020, Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved.

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