Cobalt/cobalt phosphide/nitrogen-doped carbon derived from zeolitic imidazolate framework-11@zeolitic imidazolate framework-12 core-shell structure as efficient electrocatalyst for oxygen evolution reaction
Journal
International Journal of Hydrogen Energy
Journal Volume
101
Start Page
1279
End Page
1287
ISSN
0360-3199
Date Issued
2025-02-03
Author(s)
DOI
10.1016/j.ijhydene.2025.01.014
Abstract
Electrochemical water splitting is considered as a promising and efficient way to produce hydrogen and oxygen, which are regarded as sustainable energy. Zeolitic imidazolate frameworks (ZIFs) have been widely utilized as sacrificial templates for synthesizing efficient electrochemical active materials with porous structure and tunable pore properties. In this study, cobalt/cobalt phosphide on N-doped carbon matrix (CPZ11@12–150) derived from the novel core-shell structure of ZIF-11@ZIF-12 is reported as a highly efficient electrocatalyst for oxygen evolution reaction (OER). With the enhanced electrical conductivity from N-doped carbon and excellent electrocatalytic activity from cobalt phosphide, the CPZ11@12–150 possesses a low overpotential (274 mV) at 10 mA cm−2 and a small Tafel slope of 76.2 mV·dec−1 in 1 M KOH. The CPZ11@12–150 also shows superior long-term stability for at least 100 h, owing to good attachment of CoP on N-doped carbon matrix and its mesoporous structure for effective releases of O2 bubbles.
Subjects
Cobalt phosphide
Core-shell structure
Electrocatalysis
Oxygen evolution reaction
Zeolitic imidazolate framework
SDGs
Publisher
Elsevier BV
Type
journal article