Boosting Oxygen Evolution Reaction by Creating Both Metal Ion and Lattice-Oxygen Active Sites in a Complex Oxide

Yinlong Zhu; Hassan A. Tahini; Zhiwei Hu; Zhi Gang Chen; Wei Zhou; Alexander C. Komarek; Qian Lin; Hong Ji Lin; Chien Te Chen; Yijun Zhong; M. T. Fernández-Díaz; Sean C. Smith; Huanting Wang; Meilin Liu; Zongping Shao

doi:10.1002/adma.201905025

Boosting Oxygen Evolution Reaction by Creating Both Metal Ion and Lattice-Oxygen Active Sites in a Complex Oxide

Yinlong Zhu, Hassan A. Tahini, Zhiwei Hu, Zhi Gang Chen, Wei Zhou^*, Alexander C. Komarek, Qian Lin, Hong Ji Lin, Chien Te Chen, Yijun Zhong, M. T. Fernández-Díaz, Sean C. Smith, Huanting Wang, Meilin Liu, Zongping Shao

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

248 Citations (Scopus)

Abstract

Developing efficient and low-cost electrocatalysts for the oxygen evolution reaction (OER) is of paramount importance to many chemical and energy transformation technologies. The diversity and flexibility of metal oxides offer numerous degrees of freedom for enhancing catalytic activity by tailoring their physicochemical properties, but the active site of current metal oxides for OER is still limited to either metal ions or lattice oxygen. Here, a new complex oxide with unique hexagonal structure consisting of one honeycomb-like network, Ba₄Sr₄(Co_0.8Fe_0.2)₄O₁₅ (hex-BSCF), is reported, demonstrating ultrahigh OER activity because both the tetrahedral Co ions and the octahedral oxygen ions on the surface are active, as confirmed by combined X-ray absorption spectroscopy analysis and theoretical calculations. The bulk hex-BSCF material synthesized by the facile and scalable sol–gel method achieves 10 mA cm⁻² at a low overpotential of only 340 mV (and small Tafel slope of 47 mV dec⁻¹) in 0.1 m KOH, surpassing most metal oxides ever reported for OER, while maintaining excellent durability. This study opens up a new avenue to dramatically enhancing catalytic activity of metal oxides for other applications through rational design of structures with multiple active sites.

Original language	English
Article number	1905025
Journal	Advanced Materials
Volume	32
Issue number	1
DOIs	https://doi.org/10.1002/adma.201905025
Publication status	Published - 1 Jan 2020

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Zhu, Y., Tahini, H. A., Hu, Z., Chen, Z. G., Zhou, W., Komarek, A. C., Lin, Q., Lin, H. J., Chen, C. T., Zhong, Y., Fernández-Díaz, M. T., Smith, S. C., Wang, H., Liu, M., & Shao, Z. (2020). Boosting Oxygen Evolution Reaction by Creating Both Metal Ion and Lattice-Oxygen Active Sites in a Complex Oxide. Advanced Materials, 32(1), Article 1905025. https://doi.org/10.1002/adma.201905025

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abstract = "Developing efficient and low-cost electrocatalysts for the oxygen evolution reaction (OER) is of paramount importance to many chemical and energy transformation technologies. The diversity and flexibility of metal oxides offer numerous degrees of freedom for enhancing catalytic activity by tailoring their physicochemical properties, but the active site of current metal oxides for OER is still limited to either metal ions or lattice oxygen. Here, a new complex oxide with unique hexagonal structure consisting of one honeycomb-like network, Ba4Sr4(Co0.8Fe0.2)4O15 (hex-BSCF), is reported, demonstrating ultrahigh OER activity because both the tetrahedral Co ions and the octahedral oxygen ions on the surface are active, as confirmed by combined X-ray absorption spectroscopy analysis and theoretical calculations. The bulk hex-BSCF material synthesized by the facile and scalable sol–gel method achieves 10 mA cm−2 at a low overpotential of only 340 mV (and small Tafel slope of 47 mV dec−1) in 0.1 m KOH, surpassing most metal oxides ever reported for OER, while maintaining excellent durability. This study opens up a new avenue to dramatically enhancing catalytic activity of metal oxides for other applications through rational design of structures with multiple active sites.",

keywords = "complex oxides, coordination environment, dual active sites, honeycomb-like structures, oxygen evolution reaction",

author = "Yinlong Zhu and Tahini, {Hassan A.} and Zhiwei Hu and Chen, {Zhi Gang} and Wei Zhou and Komarek, {Alexander C.} and Qian Lin and Lin, {Hong Ji} and Chen, {Chien Te} and Yijun Zhong and Fern{\'a}ndez-D{\'i}az, {M. T.} and Smith, {Sean C.} and Huanting Wang and Meilin Liu and Zongping Shao",

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AU - Hu, Zhiwei

AU - Chen, Zhi Gang

AU - Zhou, Wei

AU - Komarek, Alexander C.

AU - Lin, Qian

AU - Lin, Hong Ji

AU - Chen, Chien Te

AU - Zhong, Yijun

AU - Fernández-Díaz, M. T.

AU - Smith, Sean C.

AU - Wang, Huanting

AU - Liu, Meilin

AU - Shao, Zongping

PY - 2020/1/1

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N2 - Developing efficient and low-cost electrocatalysts for the oxygen evolution reaction (OER) is of paramount importance to many chemical and energy transformation technologies. The diversity and flexibility of metal oxides offer numerous degrees of freedom for enhancing catalytic activity by tailoring their physicochemical properties, but the active site of current metal oxides for OER is still limited to either metal ions or lattice oxygen. Here, a new complex oxide with unique hexagonal structure consisting of one honeycomb-like network, Ba4Sr4(Co0.8Fe0.2)4O15 (hex-BSCF), is reported, demonstrating ultrahigh OER activity because both the tetrahedral Co ions and the octahedral oxygen ions on the surface are active, as confirmed by combined X-ray absorption spectroscopy analysis and theoretical calculations. The bulk hex-BSCF material synthesized by the facile and scalable sol–gel method achieves 10 mA cm−2 at a low overpotential of only 340 mV (and small Tafel slope of 47 mV dec−1) in 0.1 m KOH, surpassing most metal oxides ever reported for OER, while maintaining excellent durability. This study opens up a new avenue to dramatically enhancing catalytic activity of metal oxides for other applications through rational design of structures with multiple active sites.

AB - Developing efficient and low-cost electrocatalysts for the oxygen evolution reaction (OER) is of paramount importance to many chemical and energy transformation technologies. The diversity and flexibility of metal oxides offer numerous degrees of freedom for enhancing catalytic activity by tailoring their physicochemical properties, but the active site of current metal oxides for OER is still limited to either metal ions or lattice oxygen. Here, a new complex oxide with unique hexagonal structure consisting of one honeycomb-like network, Ba4Sr4(Co0.8Fe0.2)4O15 (hex-BSCF), is reported, demonstrating ultrahigh OER activity because both the tetrahedral Co ions and the octahedral oxygen ions on the surface are active, as confirmed by combined X-ray absorption spectroscopy analysis and theoretical calculations. The bulk hex-BSCF material synthesized by the facile and scalable sol–gel method achieves 10 mA cm−2 at a low overpotential of only 340 mV (and small Tafel slope of 47 mV dec−1) in 0.1 m KOH, surpassing most metal oxides ever reported for OER, while maintaining excellent durability. This study opens up a new avenue to dramatically enhancing catalytic activity of metal oxides for other applications through rational design of structures with multiple active sites.

KW - complex oxides

KW - coordination environment

KW - dual active sites

KW - honeycomb-like structures

KW - oxygen evolution reaction

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Boosting Oxygen Evolution Reaction by Creating Both Metal Ion and Lattice-Oxygen Active Sites in a Complex Oxide

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