Volume 61, Issue 45 e202212542
Communication

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

Dr. Yafei Zhao

Dr. Yafei Zhao

School of Chemical and Biomedical Engineering, Nanyang Technological University, 62 Nanyang Drive, Singapore, 637459 Singapore

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Dr. Xue Feng Lu

Dr. Xue Feng Lu

School of Chemical and Biomedical Engineering, Nanyang Technological University, 62 Nanyang Drive, Singapore, 637459 Singapore

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Dr. Guilan Fan

Dr. Guilan Fan

School of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot, 010021 China

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Dr. Deyan Luan

Dr. Deyan Luan

School of Chemical and Biomedical Engineering, Nanyang Technological University, 62 Nanyang Drive, Singapore, 637459 Singapore

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Prof. Xiaojun Gu

Corresponding Author

Prof. Xiaojun Gu

School of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot, 010021 China

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Prof. Xiong Wen (David) Lou

Corresponding Author

Prof. Xiong Wen (David) Lou

School of Chemical and Biomedical Engineering, Nanyang Technological University, 62 Nanyang Drive, Singapore, 637459 Singapore

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First published: 12 September 2022
Citations: 66

Graphical Abstract

An advanced electrocatalyst has been developed by decorating single-Ni atoms on hollow S/N-doped football-like carbon spheres (Ni SAs@S/N-FCS) for the oxygen evolution reaction. Thanks to the abundantly surface-exposed single-Ni atoms, hollow S/N-codoped carbon matrix, as well as their strong synergistic interactions, the resultant Ni SAs@S/N-FCS electrocatalyst exhibits outstanding activity and stability for alkaline oxygen evolution reaction.

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.

Data Availability Statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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