Mn-Dopant Differentiating the Ru and Ir Oxidation States in Catalytic Oxides Toward Durable Oxygen Evolution Reaction in Acidic Electrolyte

Jinwhan Joo, Ye Ji Park, Jun Kim, Taehyun Kwon, Minki Jun, Docheon Ahn, Hionsuck Baik, Jong Hyun Jang, Jin Young Kim, Kwangyeol Lee

Research output: Contribution to journalArticlepeer-review

29 Citations (Scopus)

Abstract

Designing an efficient and durable electrocatalyst for the sluggish oxygen evolution reaction (OER) at the anode remains the foremost challenge in developing proton exchange membrane (PEM) electrolyzers. Here, a highly active and durable cactus-like nanoparticle with an exposed heterointerface between the IrO2 and the low oxidation state Ru by introducing a trace amount of Mn dopant is reported. The heterostructure fabrication relies on initial mixing of the Ru and Ir phases before electrochemical oxidation to produce a conjoined Ru/IrO2 heterointerface. Benefitting from electron transfer at the heterointerface, the low oxidation state Ru species shows excellent initial activity, which is maintained even after 180 h of continuous OER test. In a half-cell test, the Mn-doped RuIr nanocactus (Mn-RuIr NCT) achieves a mass activity of 1.85 A mgIr+Ru−1 at 1.48 VRHE, which is 139-fold higher than that of commercial IrO2. Moreover, the superior electrocatalytic performance of Mn-RuIr NCT in the PEM electrolysis system ensures its viability in practical uses. The results of the excellent catalytic performance for acidic OER indicate that the heterostructuring robust rutile IrO2 and the highly active Ru species with a low oxidation state on the catalyst surface drive a synergistic effect.

Original languageEnglish
Article number2101236
JournalSmall Methods
Volume6
Issue number1
DOIs
Publication statusPublished - 2022 Jan 20

Bibliographical note

Funding Information:
J.J., Y.P., and J.K. contributed equally to this work. This work was supported by the National Research Foundation (NRF) of Korea, Grant No. NRF‐2019R1A6A1A11044070, NRF‐2019M3E5A1064709, and NRF‐2020R1A2B5B03002475, the KIST Institutional Program (2E31002), and the KBSI under the R&D program (Project No. C123000) supervised by the Ministry of Science and the Hydrogen Energy Innovation Technology Development Program of the National Research Foundation of Korea (NRF) funded by the Korean government (Ministry of Science and ICT (MSIT)) (No. 2019M3E6A1063674). Experiments at PLS‐II were supported by MSICT and POSTECH. The authors also thank KBSI Seoul Center and Busan Center to use their HRTEM and XPS instruments.

Funding Information:
J.J., Y.P., and J.K. contributed equally to this work. This work was supported by the National Research Foundation (NRF) of Korea, Grant No. NRF-2019R1A6A1A11044070, NRF-2019M3E5A1064709, and NRF-2020R1A2B5B03002475, the KIST Institutional Program (2E31002), and the KBSI under the R&D program (Project No. C123000) supervised by the Ministry of Science and the Hydrogen Energy Innovation Technology Development Program of the National Research Foundation of Korea (NRF) funded by the Korean government (Ministry of Science and ICT (MSIT)) (No. 2019M3E6A1063674). Experiments at PLS-II were supported by MSICT and POSTECH. The authors also thank KBSI Seoul Center and Busan Center to use their HRTEM and XPS instruments.

Publisher Copyright:
© 2021 Wiley-VCH GmbH

ASJC Scopus subject areas

  • General Chemistry
  • General Materials Science

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