Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 615, Issue -, Pages 456-464Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2022.02.007
Keywords
Heteroatom doping; Ion-exchange; Phosphorization; Active sites; Overall water splitting
Categories
Funding
- National Natural Science Foun-dation of China [51978372, 51978373]
- National Key R&D Program of China [2019YFA0705802]
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Designing non-precious electrocatalysts with multiple active centers and durability is important for storing renewable energy. This study reports a low-cost Mo, Fe codoped NiCoPx electrocatalyst with competitive oxygen and hydrogen evolution reaction performance. The Mo, Fe codoped heterostructure accelerates the kinetics of electrochemical water splitting.
Designing non-precious electrocatalysts with multiple active centers and durability toward overall water splitting is of great significance for storing renewable energy. This study reports a low-cost Mo, Fe codoped NiCoPx electrocatalysts derived from Co-Fe Prussian blue analogue and following phosphorization process. Benefitted from the optimized electronic configuration, hierarchical structure and abundant active sites, the Mo,Fe-NiCoPx/NF electrode has shown competitive oxygen evolution reaction (eta(10) = 197 mV) and hydrogen evolution reaction performance (eta(10)& nbsp;= 99 mV) when the current density is 10 mA cm(-2) in 1 M KOH solution. Moreover, the integrated water splitting device assembled by Mo, Fe-NiCoPx/NF as both anode and cathode only needs a voltage of 1.545 V to reach 10 mA cm(-2). Density functional theory results further confirm that the Mo, Fe codoped heterostructure can synergistically optimize the d-band center and Gibbs free energy during electrocatalytic processes, thus accelerating the kinetics of electrochemical water splitting. This work demonstrates the importance of rational combination of metal doping and interface engineering for advanced catalytic materials. (C)& nbsp;2022 Published by Elsevier Inc.
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