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Nano Research 2023, 16(5): 7724-7732 https://doi.org/10.1007/s12274-022-5280-8
Research Article | Issue | Published: 27 December 2022

Rational design of robust iridium-ceria oxide-carbon nanofibers to boost oxygen evolution reaction in both alkaline and acidic media

Show Author's Information Xiaojie Chen1,§,  Wenying Liao2,§,  Mengxiao Zhong1,  Junjie Chen3,  Su Yan1,  Weimo Li1,  Ce Wang1,  Wei Chen2,4( ),  Xiaofeng Lu1( )
Alan G. MacDiarmid Institute, College of Chemistry, Jilin University, 2699 Qianjin Street, Changchun 130012, China
Engineering Research Center of Industrial Biocatalysis, College of Chemistry and Materials Science, Fujian Normal University, Fuzhou 350007, China
State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun 130012, China
Academy of Carbon Neutrality of Fujian Normal University, Fuzhou 350007, China

§ Xiaojie Chen and Wenying Liao contributed equally to this work.

Keywords:
electrospinning, electrocatalysis, oxygen evolution reaction, iridium, ceria oxide
Topics:
ElectrospinningNanofibers
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Chen X, Liao W, Zhong M, et al. Rational design of robust iridium-ceria oxide-carbon nanofibers to boost oxygen evolution reaction in both alkaline and acidic media. Nano Research, 2023, 16(5): 7724-7732. https://doi.org/10.1007/s12274-022-5280-8
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Abstract Full text Electronic supplementary material About this article

Anodic oxygen evolution reaction (OER) is essential to participate in diverse renewable energy conversion and storage processes, while most OER electrocatalysts present satisfactory catalytic performance in only alkaline or acidic medium, limiting their practical applications in many aspects. Herein, we have designed and prepared Ir-CeO2-C nanofibers (NFs) via an electrospinning and a relatively low-temperature calcination strategy for OER application in both alkaline and acidic conditions. Density functional theory (DFT) simulations demonstrate the high catalytic active sites of Ir atoms for OER, and that the formation of Ir–O bonds at the interface between Ir and CeO2 can modulate the electron density of the relevant Ir atoms to promote the OER activity. In addition, the unique nanofibrous heterostructure increases the exposed active sites and promotes the electrical conductivity. Therefore, the prepared Ir-CeO2-C nanofibrous catalyst delivers an excellent OER property in both alkaline and acidic solutions. Impressively, the overpotentials to reach 10 mA·cm−2 are only 279 and 283 mV in the alkaline and acidic electrolyte, respectively, with favorable long-term stabilities. In addition, the two-electrode overall water splitting set-ups equipped with Ir-CeO2-C NFs as anode and commercial Pt/C as cathode provide a cell voltage of 1.54 and 1.53 V to drive 10 mA·cm−2 in the alkaline and acidic electrolyte, respectively, which are much lower than Pt/C||IrO2 and lots of transition metal oxides-based electrolyzers. This research presents an efficient means to design OER catalysts with superior properties in both alkaline and acidic solutions.


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Electronic supplementary material
About this article

Rational design of robust iridium-ceria oxide-carbon nanofibers to boost oxygen evolution reaction in both alkaline and acidic media

Show Author's information Xiaojie Chen1,§, Wenying Liao2,§, Mengxiao Zhong1, Junjie Chen3, Su Yan1, Weimo Li1, Ce Wang1, Wei Chen2,4( ), Xiaofeng Lu1( )
Alan G. MacDiarmid Institute, College of Chemistry, Jilin University, 2699 Qianjin Street, Changchun 130012, China
Engineering Research Center of Industrial Biocatalysis, College of Chemistry and Materials Science, Fujian Normal University, Fuzhou 350007, China
State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun 130012, China
Academy of Carbon Neutrality of Fujian Normal University, Fuzhou 350007, China

§ Xiaojie Chen and Wenying Liao contributed equally to this work.

Abstract

Anodic oxygen evolution reaction (OER) is essential to participate in diverse renewable energy conversion and storage processes, while most OER electrocatalysts present satisfactory catalytic performance in only alkaline or acidic medium, limiting their practical applications in many aspects. Herein, we have designed and prepared Ir-CeO2-C nanofibers (NFs) via an electrospinning and a relatively low-temperature calcination strategy for OER application in both alkaline and acidic conditions. Density functional theory (DFT) simulations demonstrate the high catalytic active sites of Ir atoms for OER, and that the formation of Ir–O bonds at the interface between Ir and CeO2 can modulate the electron density of the relevant Ir atoms to promote the OER activity. In addition, the unique nanofibrous heterostructure increases the exposed active sites and promotes the electrical conductivity. Therefore, the prepared Ir-CeO2-C nanofibrous catalyst delivers an excellent OER property in both alkaline and acidic solutions. Impressively, the overpotentials to reach 10 mA·cm−2 are only 279 and 283 mV in the alkaline and acidic electrolyte, respectively, with favorable long-term stabilities. In addition, the two-electrode overall water splitting set-ups equipped with Ir-CeO2-C NFs as anode and commercial Pt/C as cathode provide a cell voltage of 1.54 and 1.53 V to drive 10 mA·cm−2 in the alkaline and acidic electrolyte, respectively, which are much lower than Pt/C||IrO2 and lots of transition metal oxides-based electrolyzers. This research presents an efficient means to design OER catalysts with superior properties in both alkaline and acidic solutions.

Keywords: electrospinning, electrocatalysis, oxygen evolution reaction, iridium, ceria oxide

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Publication history
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Acknowledgements

Publication history

Received: 07 August 2022
Revised: 19 October 2022
Accepted: 01 November 2022
Published: 27 December 2022
Issue date: May 2023

Copyright

© Tsinghua University Press 2022

Acknowledgements

Acknowledgement

This work was financially supported by the National Natural Science Foundation of China (Nos. 51973079 and 21673093), the Natural Science Foundation of Fujian Province (No. 2020J01147), Research Foundation of Academy of Carbon Neutrality of Fujian Normal University (No. TZH2022-05), and Minjiang Scholar and Startup Fund for High-level Talent at Fujian Normal University.

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