DataVXAdvanced Functional MaterialsPaper
journal article·2022-08

Heat‐Triggered Ferri‐to‐Paramagnetic Transition Accelerates Redox Couple‐Mediated Electrocatalytic Water Oxidation

Duanduan Liu, Mengfei Lu, Depei Liu, Shicheng Yan, Wei Zhou, Lunyong Zhang, Zhigang Zou

Advanced Functional Materials· Volume 32· Issue 32
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Source abstract

Abstract

Abstract Redox couple oxidation as an initial step of water oxidation may be key for high electricity consumption in the electrochemical oxygen evolution reaction (OER). Here, a heat‐induced magnetic transition strategy is reported to speed up the oxidation kinetics of redox couples. The activation energy of Ni2+/Ni3+ redox couple oxidation is sharply decreased by heating the Ni0.67Fe0.33OxHy catalyst above a Curie temperature (Tc) of 70 °C. In such a strategy, heat instead of electricity drives the spin flipping of Ni2+/Ni3+ oxidation through heat‐sensitive ferri‐to‐paramagnetic spin state changes. As a result of magnetic transition‐assisted efficient heat‐electricity coupling, Ni0.67Fe0.33OxHy exhibits the lowest OER overpotential of 221 mV at 100 mA cm−2 at 90 °C in alkaline electrolytes, outperforming the benchmark IrO2 catalyst. The findings provide new insights into the design of efficient heat–electricity complementary OER devices.
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Research context

Energy storageCatalysis & surfaces

OpenAlex topics: Electrocatalysts for Energy Conversion · Advanced battery technologies research · Electrochemical Analysis and Applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

National Laboratory of Solid State Microstructures Jiangsu Key Laboratory for Nano Technology School of Physics Nanjing University No. 22 Hankou Road Nanjing Jiangsu 210093 P. R. China

Jiangsu Key Laboratory of Artificial Functional Materials Collaborative Innovation Center of Advanced Microstructures Eco‐materials and Renewable Energy Research Center (ERERC) College of Engineering and Applied Sciences Nanjing University No. 22, Hankou Road Nanjing Jiangsu 210093 P. R. China

Department of Physics Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparing Technology School of Science Tianjin University Tianjin 300072 P. R. China

School of Materials Science and Engineering Harbin Institute of Technology Harbin Heilongjiang 150001 P. R. China

Funding

National Natural Science Foundation of China

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