Volume 59, Issue 19 pp. 7384-7389
Communication

Single-Atom Iron Catalysts on Overhang-Eave Carbon Cages for High-Performance Oxygen Reduction Reaction

Dr. Chun-Chao Hou

Dr. Chun-Chao Hou

AIST-Kyoto University Chemical Energy Materials Open Innovation Laboratory (ChEM-OIL), National Institute of Advanced Industrial Science and Technology (AIST), Sakyo-ku, Kyoto, 606-8501 Japan

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Dr. Lianli Zou

Dr. Lianli Zou

AIST-Kyoto University Chemical Energy Materials Open Innovation Laboratory (ChEM-OIL), National Institute of Advanced Industrial Science and Technology (AIST), Sakyo-ku, Kyoto, 606-8501 Japan

Graduate School of Engineering, Kobe University, Nada Ku, Kobe, Hyogo, 657-8501 Japan

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Dr. Liming Sun

Dr. Liming Sun

AIST-Kyoto University Chemical Energy Materials Open Innovation Laboratory (ChEM-OIL), National Institute of Advanced Industrial Science and Technology (AIST), Sakyo-ku, Kyoto, 606-8501 Japan

Laboratory of Quantum Materials Design and Application, School of Physics and Electronic Engineering, Jiangsu Normal University, Xuzhou, 221116 P. R. China

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Dr. Kexin Zhang

Dr. Kexin Zhang

Beijing Key laboratory for Theory and Technology of Advanced Battery Materials, Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing, 100871 P. R. China

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Dr. Zheng Liu

Dr. Zheng Liu

Inorganic Functional Materials Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), 2266-98 Anagahora, Shimoshidami, Moriyamaku, Nagoya, Aichi, 463-8560 Japan

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Prof. Yinwei Li

Prof. Yinwei Li

Laboratory of Quantum Materials Design and Application, School of Physics and Electronic Engineering, Jiangsu Normal University, Xuzhou, 221116 P. R. China

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Dr. Caixia Li

Dr. Caixia Li

AIST-Kyoto University Chemical Energy Materials Open Innovation Laboratory (ChEM-OIL), National Institute of Advanced Industrial Science and Technology (AIST), Sakyo-ku, Kyoto, 606-8501 Japan

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Prof. Ruqiang Zou

Prof. Ruqiang Zou

Beijing Key laboratory for Theory and Technology of Advanced Battery Materials, Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing, 100871 P. R. China

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Prof. Jihong Yu

Prof. Jihong Yu

State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry; International Center of Future Science, Jilin University, Changchun, 130012 P. R. China

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Prof. Qiang Xu

Corresponding Author

Prof. Qiang Xu

AIST-Kyoto University Chemical Energy Materials Open Innovation Laboratory (ChEM-OIL), National Institute of Advanced Industrial Science and Technology (AIST), Sakyo-ku, Kyoto, 606-8501 Japan

Graduate School of Engineering, Kobe University, Nada Ku, Kobe, Hyogo, 657-8501 Japan

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First published: 09 March 2020
Citations: 323

Graphical Abstract

An overhang-eave carbon cage decorated with single-atom iron catalysts for oxygen reduction (ORR) is prepared. This structure could furnish more stretched edges as three-phase boundaries to support the mass transport of ORR-relevant species and to expose the atomically dispersed/catalytically active iron sites to the utmost, thus increasing the utilization of each active site.

Abstract

Single-atom catalysts have drawn great attention, especially in electrocatalysis. However, most of previous works focus on the enhanced catalytic properties via improving metal loading. Engineering morphologies of catalysts to facilitate mass transport through catalyst layers, thus increasing the utilization of each active site, is regarded as an appealing way for enhanced performance. Herein, we design an overhang-eave structure decorated with isolated single-atom iron sites via a silica-mediated MOF-templated approach for oxygen reduction reaction (ORR) catalysis. This catalyst demonstrates superior ORR performance in both alkaline and acidic electrolytes, comparable to the state-of-the-art Pt/C catalyst and superior to most precious-metal-free catalysts reported to date. This activity originates from its edge-rich structure, having more three-phase boundaries with enhanced mass transport of reactants to accessible single-atom iron sites (increasing the utilization of active sites), which verifies the practicability of such a synthetic approach.

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