A synergistic architecture design on integrally boosting the hydroxyl adsorption and charge transfer for oxygen evolution reaction

Chen, Jiani and Zhu, Shiliang and Ge, Lei ORCID: https://orcid.org/0000-0003-2989-0329 and She, Sixuan and Liu, Dongliang and Sha, Yuchen and Zhou, Wei and Shao, Zongping (2022) A synergistic architecture design on integrally boosting the hydroxyl adsorption and charge transfer for oxygen evolution reaction. Journal of Materials Chemistry A. ISSN 2050-7488


Abstract

The adsorption of surface reactant hydroxyl and subsequent charge transfer are the cornerstones of alkaline oxygen evolution reaction (OER). Though exhibiting benign OER performance, the catalytic activity of perovskite oxides is restricted by their inferior specific area and insufficient hydroxyl affinity. Here, a novel architecture composed of karren-structure and hybrid phase was proposed to uplift the kinetic limitation of hydroxyl adsorption and charge transfer. As a proof-of-concept, the karren-structure perovskite-based compound (Pr0.5Ba0.25Sr0.25Co0.8Fe0.2O3-δ-Co3O4) synthesized by a facile molten-salt synthesis exhibits excellent OER activity with a low overpotential of 360 mV at 10 mA cm-2 in 0.1 M KOH, and delivers 5-fold mass activity at 1.63 V relative to the pristine perovskite Pr0.5Ba0.25Sr0.25Co0.8Fe0.2O3-δ, outperforming various transition metal oxides and noble metal RuO2. With insights from physicochemical characterization and in situ electrochemical analysis, the interlinked karren-structure is effective in providing active area and ion transfer channels for promoting the contact of hydroxyl with active sites, while the strong electronic interaction of the hybrid phase further favors the hydroxyl adsorption and charge transfer, synergistically expediting the sluggish OER kinetics. This work provides insights into the design of perovskite-based electrocatalysts with high performance via a synergistic structural modulation.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Files associated with this item cannot be displayed due to copyright restrictions.
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Future Materials (1 Jan 2017 -)
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Future Materials (1 Jan 2017 -)
Date Deposited: 14 Aug 2022 23:32
Last Modified: 28 Sep 2022 04:47
Uncontrolled Keywords: hydroxyl adsorption; oxygen evolution reaction; catalytic activity; perovskite oxides
Fields of Research (2020): 40 ENGINEERING > 4016 Materials engineering > 401605 Functional materials
40 ENGINEERING > 4004 Chemical engineering > 400404 Electrochemical energy storage and conversion
34 CHEMICAL SCIENCES > 3403 Macromolecular and materials chemistry > 340303 Nanochemistry
Identification Number or DOI: https://doi.org/10.1039/D2TA05356J
URI: http://eprints.usq.edu.au/id/eprint/50907

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