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ORR and OER of Co-N codoped carbon-based electrocatalysts enhanced by boundary layer oxygen molecules transfer

  • Zhang, Jintao
  • Zhang, Tong
  • Ma, Jing
  • Wang, Zhi
  • Liu, Junhao
  • Gong, Xuzhong
Publication Date
Feb 01, 2021
Institutional Repository of Institute of Process Engineering, CAS (IPE-IR)
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Two-step carbonization method was reported to synthesize Co-N doped coal tar pitch (CTP) carbon-based electrocatalysts with hierarchical pore structure, high local order degree and efficient Co-N-x active structure simultaneously. The synergistic effect of the carbon substrate with highly ordered structure and the Co-N-x active sites realized the "Point discharge effect". The pi-pi interactions from the CTP aromatic ring sheets and Co-N-x promoted the adsorption and dissociation of oxygen molecules, respectively. The increased diffusion coefficient (D-0) indicated the mass transfer of oxygen molecules in the boundary layer was enhanced during the ORR process. Thanks to excellent structural characteristics, ACTP(5)@Co,N-800 exhibited better ORR performance than commercial Pt/C catalyst under alkaline conditions, and the OER activity was improved simultaneously. This work demonstrated a simple and practical strategy for the development of advanced carbon-based electrocatalysts, and also provided novel insights from kinetics perspectives for improving electrocatalytic efficiency. (C) 2020 Elsevier Ltd. All rights reserved.

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