MOF-derived N-doped CoNi@C as bifunctional catalysts for efficient water splitting

Abstract

The development of efficient and stable bifunctional non-noble metal catalysts for the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) is essential for electrochemical water splitting. In this study, CoNi@C core–shell structure catalysts derived from ZIF-67 were synthesized through high-temperature calcination. The hydrophilic carbon shell inhibits the oxidation of Co and Ni and enhances the activity and stability of the water splitting reaction. CoNi serves as the active site of the reaction, while the doped nitrogen further promotes the electrocatalytic reaction. The synthesized Ni1Co10/C catalyst exhibits high bifunctional performance, with low overpotentials at 100 mA cm−2 for the OER (380 mV) and HER (357 mV), and a high double-layer capacitance (54 mF cm−2). Moreover, the Ni1Co10/C catalyst serves as an effective cathode for water splitting in a two-electrode system, demonstrating a stable cell voltage of 2.05 V and maintaining a constant catalytic current of 100 mA cm−2 over 24 hours. DFT calculation showed that the active site of the OER and HER was Co.

Graphical abstract: MOF-derived N-doped CoNi@C as bifunctional catalysts for efficient water splitting

Supplementary files

Article information

Article type
Paper
Submitted
26 Jul 2024
Accepted
10 Oct 2024
First published
11 Oct 2024

Catal. Sci. Technol., 2024, Advance Article

MOF-derived N-doped CoNi@C as bifunctional catalysts for efficient water splitting

X. Yang, Z. Li, Z. Yang, D. Meng and Z. Wang, Catal. Sci. Technol., 2024, Advance Article , DOI: 10.1039/D4CY00924J

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