4.6 Article

NiFe-CN catalysts derived from the solid-phase exfoliation of NiFe-layered double hydroxide for CO2 electroreduction

期刊

NEW JOURNAL OF CHEMISTRY
卷 46, 期 33, 页码 16019-16024

出版社

ROYAL SOC CHEMISTRY
DOI: 10.1039/d2nj02234f

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资金

  1. National Natural Science Foundation of China [U20A20125]
  2. State Key Laboratory of Environment-friendly Energy Materials research on independent subjects [21FKSY18]

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This study developed a porous NiFe-CN catalyst through solid-phase exfoliation, which showed excellent catalytic performance for the reduction of CO2. Particularly, the NiFe-CN-1 catalyst exhibited high faradaic efficiency and CO current density under specific conditions.
The development of efficient carbon dioxide reduction reaction (CO2RR) catalysts is one of the practical solutions to the current environmental problems. Usually, metal-doped catalysts are used for the CO2RR, but the metal elements can easily aggregate, resulting in a reduction in the catalytic performance. In this study, NiFe-LDH was exfoliated to single layer by a solid-phase exfoliation strategy, wherein Ni and Fe were doped on the char material owing to the pyrolysis of the solid-phase exfoliation agent, and the NiFe-CN catalyst with a gauzy and porous structure was obtained. The catalyst possessed excellent catalytic performance; particularly, when the mass fraction of NiFe-LDH was 1 wt%, the prepared catalyst (NiFe-CN-1) showed a faradaic efficiency of 93.5% for the reduction of CO2 to CO at -0.8 V (vs. reversible hydrogen electrode (RHE)) with a CO current density of 10.4 mA cm(-2), which was due to the sufficient exposure of active sites and efficient proton transfer channels of NiFe-CN. This strategy provides a new idea to easily mass produce CO2RR electrocatalysts in an environmentally benign way.

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