Issue 21, 2021

Facile formation of Fe-doped NiCoP hollow nanocages as bifunctional electrocatalysts for overall water splitting

Abstract

Rational design of electrocatalysts with unique morphological structures and chemical compositions is crucial for electrochemical performance and energy storage capacity. In this work, an Fe-doped NiCoP hybrid hollow nanocage (denoted as Fe-NiCoP) was synthesized through the phosphorization of the product from [Fe(CN)6]3−-intercalated NiCo-LDH (layered double hydroxide), where the original ZIF-67-Co was used as the template. Because of the hollow nanostructure and the synergistic effect between multiple components, the Fe-NiCoP catalyst exhibited promising hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) activities in 1.0 M KOH with low overpotentials of 147 and 235 mV at 10 mA cm−2, respectively. Furthermore, the Fe-NiCoP catalyst only achieved a current density of 10 mA cm−2 at the voltage of 1.60 V. Inspired by the excellent OER performance of the Fe-NiCoP catalyst, a Zn–air battery was built to explore the Fe-NiCoP catalyst for practical application. After 900 successive cycles, the Fe-NiCoP + Pt/C catalysts exhibited excellent cycling stability at 5 mA cm−2, which was a much stronger performance than that of the RuO2 + Pt/C catalysts. This work provides a practical strategy for the synthesis of high-performance and low-cost electrocatalysts.

Graphical abstract: Facile formation of Fe-doped NiCoP hollow nanocages as bifunctional electrocatalysts for overall water splitting

Supplementary files

Article information

Article type
Paper
Submitted
29 mar 2021
Accepted
26 abr 2021
First published
30 abr 2021

CrystEngComm, 2021,23, 3861-3869

Facile formation of Fe-doped NiCoP hollow nanocages as bifunctional electrocatalysts for overall water splitting

B. He, C. Peng, F. Ye, H. Gao, Y. Wang, Y. Tang, Q. Hao, H. Liu and Z. Su, CrystEngComm, 2021, 23, 3861 DOI: 10.1039/D1CE00415H

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