Affiliation:
1. Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle Institute of Environmental and Chemical Engineering National‐local Joint Engineering Research Center of Heavy Metals Pollutants Control and Resource Utilization Nanchang Hangkong University Nanchang 330063 P. R. China
2. Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle Institute of Environmental and Chemical Engineering Nanchang Hangkong University Nanchang 330063 P. R. China
Abstract
AbstractThe rational design of inexpensive metal electrocatalysts with exciting catalytic activity for overall water splitting (OWS) remains a significant challenge. Heterostructures of NiFe layered double hydroxides (NiFe‐LDHs) with abundant oxygen defects and tunable electronic properties have garnered considerable attention. Here, a self‐supporting heterostructured catalyst (named MoO3/NiFe‐NF) is synthesized via a hydrothermal method to grow NiFe‐LDH with oxygen vacancies (OV) in situ on inexpensive nickel foam (NF). Subsequently, MoO3 is anchored and grown on the surface of NiFe‐LDH by electrodeposition. The obtained catalysts achieved outstanding oxygen/hydrogen evolution reaction (OER/HER, 212 mV/85 mV@10 mA cm−2) performance in 1 m KOH. Additionally, when MoO3/NiFe‐NF is utilized as the cathode and anode in OWS, a current density of 10 mA cm−2 can be obtained as an ultralow battery voltage of 1.43 V, a significantly lower value compared to the commercial electrolyzer incorporating Pt/C and IrO2 electrode materials. Finally, density functional theory (DFT) calculations and advanced spectroscopy technology are conducted to reveal the effects of heterojunctions and OV on the internal electronic structure of the electrical catalysts. Mainly, the present study provides a novel tactic for the rational design of remarkable, low‐cost NiFe‐LDH electrocatalysts with heterostructures for OWS.
Funder
National Natural Science Foundation of China
Major Discipline Academic and Technical Leaders Training Program of Jiangxi Province
Natural Science Foundation of Jiangxi Province
Subject
Biomaterials,Biotechnology,General Materials Science,General Chemistry