Issue 23, 2024

Guanine-derived carbon nanosheet encapsulated Ni nanoparticles for efficient CO2 electroreduction

Abstract

Developing novel electrocatalysts for achieving high selectivity and faradaic efficiency in the carbon dioxide reduction reaction (CO2RR) poses a major challenge. In this study, a catalyst featuring a nitrogen-doped carbon shell-coated Ni nanoparticle structure is designed for efficient carbon dioxide (CO2) electroreduction to carbon monoxide (CO). The optimal Ni@NC-1000 catalyst exhibits remarkable CO faradaic efficiency (FECO) values exceeding 90% across a broad potential range of −0.55 to −0.9 V (vs. RHE), and attains the maximum FECO of 95.6% at −0.75 V (vs. RHE) in 0.5 M NaHCO3. This catalyst exhibits sustained carbon dioxide electroreduction activity with negligible decay after continuous electrolysis for 20 h. More encouragingly, a substantial current density of 200.3 mA cm−2 is achieved in a flow cell at −0.9 V (vs. RHE), reaching an industrial-level current density. In situ Fourier transform infrared spectroscopy and theoretical calculations demonstrate that its excellent catalytic performance is attributed to highly active pyrrolic nitrogen sites, promoting CO2 activation and significantly reducing the energy barrier for generating *COOH. To a considerable extent, this work presents an effective strategy for developing high-efficiency catalysts for electrochemical CO2 reduction across a wide potential window.

Graphical abstract: Guanine-derived carbon nanosheet encapsulated Ni nanoparticles for efficient CO2 electroreduction

Supplementary files

Article information

Article type
Paper
Submitted
21 feb. 2024
Accepted
05 may. 2024
First published
21 may. 2024

Dalton Trans., 2024,53, 9724-9731

Guanine-derived carbon nanosheet encapsulated Ni nanoparticles for efficient CO2 electroreduction

Y. Peng, S. Chen, Z. Hu, M. Yin, L. Pei, Q. Wei and Z. Xie, Dalton Trans., 2024, 53, 9724 DOI: 10.1039/D4DT00495G

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