Bifunctional electrochemical properties of La0.8Sr0.2Co0.8M0.2O3−δ (M = Ni, Fe, Mn, and Cu): efficient elemental doping based on a structural and pH-dependent study

J. Cheng; P. Ganesan; Z. Wang; M. Zhang; G. Zhang; N. Maeda; J. Matsuda; M. Yamauchi; B. Chi; N. Nakashima

doi:10.1039/D1MA00632K

Bifunctional electrochemical properties of La_0.8Sr_0.2Co_0.8M_0.2O_3−δ (M = Ni, Fe, Mn, and Cu): efficient elemental doping based on a structural and pH-dependent study†

J. Cheng,

*^ab P. Ganesan,

^a Z. Wang,^b M. Zhang,

^c G. Zhang,

^d N. Maeda,^a J. Matsuda,^ae M. Yamauchi,

^af B. Chi

^b and N. Nakashima

*^a

Author affiliations

* Corresponding authors

^a International Institute for Carbon-Neutral Energy Research (I2CNER), Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, Japan
E-mail: cheng.junfang.423@m.kyushu-u.ac.jp, pandian.ganesan.631@m.kyushu-u.ac.jp, nakashima.naotoshi.614@m.kyushu-u.ac.jp

^b Center for Fuel Cell Innovation, State Key Laboratory of Material Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science & Technology, Wuhan, China

^c CAS Key Laboratory of Design and Assembly of Functional Nanostructures, and Fujian Provincial Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, China

^d Department of Applied Chemistry, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan

^e International Research Center for Hydrogen Energy, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, Japan

^f Advanced Institute for Materials Research (WPI-AIMR), Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, Japan

Abstract

Perovskite oxides with a low cost and high catalytic activity are considered as suitable candidates for the oxygen evolution reaction (OER)/oxygen reduction reaction (ORR), but most of them favour only either the ORR or the OER. Besides, their underlying catalytic mechanisms are subject of an ongoing debate. Herein, La_0.8Sr_0.2CoO_3−δ (LSC) was selected as a base perovskite oxide for doping different elements into its B-site to fabricate four different La_0.8Sr_0.2Co_0.8M_0.2O_3−δ (LSCM; M = Ni, Fe, Mn, and Cu) perovskite oxides. Among the catalysts tested with and without multi-walled carbon nanotubes (MWNTs), La_0.8Sr_0.2Co_0.8Fe_0.2O_3−δ (LSCF) outperformed any other catalysts in terms of both OER and ORR activity. The OER/ORR activity enhancement with LSCF is also discussed based on spectroscopic and microscopic analyses and lattice oxygen transportation.

Materials Advances

Bifunctional electrochemical properties of La_0.8Sr_0.2Co_0.8M_0.2O_3−δ (M = Ni, Fe, Mn, and Cu): efficient elemental doping based on a structural and pH-dependent study†

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Bifunctional electrochemical properties of La_0.8Sr_0.2Co_0.8M_0.2O_3−δ (M = Ni, Fe, Mn, and Cu): efficient elemental doping based on a structural and pH-dependent study

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Materials Advances

Bifunctional electrochemical properties of La0.8Sr0.2Co0.8M0.2O3−δ (M = Ni, Fe, Mn, and Cu): efficient elemental doping based on a structural and pH-dependent study†

Abstract

Supplementary files

Article information

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Bifunctional electrochemical properties of La0.8Sr0.2Co0.8M0.2O3−δ (M = Ni, Fe, Mn, and Cu): efficient elemental doping based on a structural and pH-dependent study

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Bifunctional electrochemical properties of La_0.8Sr_0.2Co_0.8M_0.2O_3−δ (M = Ni, Fe, Mn, and Cu): efficient elemental doping based on a structural and pH-dependent study†

Bifunctional electrochemical properties of La_0.8Sr_0.2Co_0.8M_0.2O_3−δ (M = Ni, Fe, Mn, and Cu): efficient elemental doping based on a structural and pH-dependent study