journal article·2018-04-13

Highly Defective Fe-Based Oxyhydroxides from Electrochemical Reconstruction for Efficient Oxygen Evolution Catalysis

Qun He, Hui Xie, Zia ur Rehman, Changda Wang, Ping Wan, Hongliang Jiang, Wangsheng Chu, Li Song

ACS Energy Letters· Volume 3· Issue 4
Publisher page

Abstract

Transition metal Fe-dominated materials generally show inefficient electrocatalytic oxygen evolution reaction (OER), while Fe-incorporated multimetallic compounds can exhibit high catalytic activity. In fact, there is always a controversy about the main active sites in Fe-involved OER elelctrocatalysts. Herein, we demonstrate a highly active mono-Fe-based OER electrocatalyst with a very low overpotential of 283 mV at a current density of 10 mA cm–2 and a Tafel slope of 41.4 mV dec–1. Systematic characterization reveals that the OER performance stems from Na dissolution during the electrocatalytic oxidation process, enabling the electrocatalyst reconstruction to form highly defective oxyhydroxides as highly active catalytic sites. Notably, the electrocatalytic activity can be significantly promoted through the introduction of a heterotransition metal. This work provides insights for active sites in OER catalysis, along with a facile route to tune the intrinsic activity.
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Research context

OpenAlex topics: Electrocatalysts for Energy Conversion · Fuel Cells and Related Materials · Advanced battery technologies research

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

Affiliations

National Synchrotron Radiation Laboratory, CAS Center for Excellence in Nanoscience, University of Science and Technology of China, Hefei, Anhui 230026, People’s Republic of China

Funding

State Administration of Foreign Experts Affairs · Ministry of Science and Technology of the People's Republic of China · Hefei Institutes of Physical Science, Chinese Academy of Sciences · China Postdoctoral Science Foundation · National Natural Science Foundation of China · Chinese Academy of Sciences · Central Committee of the Communist Party of China · Ministry of Education Key Laboratory for Advanced Catalysis Materials, Zhejiang Normal University · Zhejiang Key Laboratory for Reactive Chemistry on Solid Surfaces, Zhejiang Normal University · Ministry of Education Key Laboratory of Advanced Energy Materials Chemistry, Nankai University

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