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

Duanduan Liu; Mengfei Lu; Depei LiuShicheng YanWei ZhouLunyong ZhangZhigang Zou

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

机译：Heat-Triggered Ferri-to-Paramagnetic Transition Accelerates Redox Couple-Mediated Electrocatalytic Water Oxidation

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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 Ni~(2+)/Ni~(3+) redox couple oxidation is sharply decreased by heating the Ni_(0.67)Fe_(0.33)O_xH_y catalyst above a Curie temperature (T_c) of 70 ℃. In such a strategy, heat instead of electricity drives the spin flipping of Ni~(2+)/Ni~(3+) oxidation through heat-sensitive ferri-to-paramagnetic spin state changes. As a result of magnetic transitionassisted efficient heat-electricity coupling, Ni_(0.67)Fe_(0.33)O_xH_y exhibits the lowest OER overpotential of 221 mV at 100 mA cm~(?2) at 90 ℃ in alkaline electrolytes, outperforming the benchmark IrO_2 catalyst. The findings provide new insights into the design of efficient heat–electricity complementary OER devices.

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来源
《Advanced functional materials》 |2022年第32期|2111234.1-2111234.10|共10页
作者
Duanduan Liu; Mengfei Lu; Depei LiuShicheng YanWei ZhouLunyong ZhangZhigang Zou;
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作者单位

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 Collabora;

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;

Department of Physics Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparing Technology School of Science Tianjin University Tianjin 300072, P. R. ChinaSchool of Materials Science and Engineering Harbin Institute of Technology Harbin, Heilongjiang 150001, P. R. China;

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正文语种英语
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heat–electricity coupling; magnetic phase transition; multienergy complementary; redox couples; water oxidation;

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

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