Surface-Exposed Single-Ni Atoms with Potential-Driven Dynamic Behaviors for Highly Efficient Electrocatalytic Oxygen Evolution

Yafei Zhao, Xue Feng Lu, Guilan Fan, Deyan Luan, Xiaojun Gu*, Xiong Wen (David) Lou*

*Corresponding author for this work

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

58 Citations (Scopus)

Abstract

Trapping the active sites on the exterior surface of hollow supports can reduce mass transfer resistance and enhance atomic utilization. Herein, we report a facile chemical vapor deposition strategy to synthesize single-Ni atoms decorated hollow S/N-doped football-like carbon spheres (Ni SAs@S/N-FCS). Specifically, the CdS@3-aminophenol/formaldehyde is carbonized into S/N-FCS. The gas-migrated Ni species are anchored on the surface of S/N-FCS simultaneously, yielding Ni SAs@S/N-FCS. The obtained catalyst exhibits outstanding performance for alkaline oxygen evolution reaction (OER) with an overpotential of 249 mV at 10 mA cm−2, a small Tafel slope of 56.5 mV dec−1, and ultra-long stability up to 166 hours without obvious fading. Moreover, the potential-driven dynamic behaviors of Ni-N4 sites and the contribution of the S dopant at different locations in the matrix to the OER activity are revealed by the operando X-ray absorption spectroscopy and theoretical calculations, respectively. © 2022 Wiley-VCH GmbH.
Original languageEnglish
Article numbere202212542
JournalAngewandte Chemie - International Edition
Volume61
Issue number45
Online published12 Sept 2022
DOIs
Publication statusPublished - 7 Nov 2022
Externally publishedYes

Research Keywords

  • Electrocatalysis
  • Hollow S/N-Doped Carbon Spheres
  • Oxygen Evolution Reaction
  • Single-Ni Atoms

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