Utilizing ion leaching effects for achieving high oxygen-evolving performance on hybrid nanocomposite with self-optimized behaviors

Daqin Guan, Gihun Ryu, Zhiwei Hu, Jing Zhou, Chung-Li Dong, Yu-Cheng Huang, Kaifeng Zhang, Yijun Zhong, Alexander C. Komarek, Ming Zhu, Xinhao Wu, Chih-Wen Pao, Chung-Kai Chang, Hong-Ji Lin, Chien-Te Chen, Wei Zhou () and Zongping Shao ()
Additional contact information
Daqin Guan: Nanjing Tech University
Gihun Ryu: Max-Planck-Institute for Chemical Physics of Solids
Zhiwei Hu: Max-Planck-Institute for Chemical Physics of Solids
Jing Zhou: Chinese Academy of Sciences
Chung-Li Dong: Tamkang University
Yu-Cheng Huang: Tamkang University
Kaifeng Zhang: Nanjing Tech University
Yijun Zhong: Curtin University
Alexander C. Komarek: Max-Planck-Institute for Chemical Physics of Solids
Ming Zhu: Nanjing Tech University
Xinhao Wu: Nanjing Tech University
Chih-Wen Pao: National Synchrotron Radiation Research Center
Chung-Kai Chang: National Synchrotron Radiation Research Center
Hong-Ji Lin: National Synchrotron Radiation Research Center
Chien-Te Chen: National Synchrotron Radiation Research Center
Wei Zhou: Nanjing Tech University
Zongping Shao: Nanjing Tech University

Nature Communications, 2020, vol. 11, issue 1, 1-10

Abstract: Abstract Ion leaching from pure-phase oxygen-evolving electrocatalysts generally exists, leading to the collapse and loss of catalyst crystalline matrix. Here, different from previous design methodologies of pure-phase perovskites, we introduce soluble BaCl2 and SrCl2 into perovskites through a self-assembly process aimed at simultaneously tuning dual cation/anion leaching effects and optimizing ion match in perovskites to protect the crystalline matrix. As a proof-of-concept, self-assembled hybrid Ba0.35Sr0.65Co0.8Fe0.2O3-δ (BSCF) nanocomposite (with BaCl2 and SrCl2) exhibits the low overpotential of 260 mV at 10 mA cm-2 in 0.1 M KOH. Multiple operando spectroscopic techniques reveal that the pre-leaching of soluble compounds lowers the difference of interfacial ion concentrations and thus endows the host phase in hybrid BSCF with abundant time and space to form stable edge/face-sharing surface structures. These self-optimized crystalline structures show stable lattice oxygen active sites and short reaction pathways between Co–Co/Fe metal active sites to trigger favorable adsorption of OH− species.

Date: 2020
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DOI: 10.1038/s41467-020-17108-5

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