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

2 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

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)

Fingerprint

Dive into the research topics of 'Mn-Dopant Differentiating the Ru and Ir Oxidation States in Catalytic Oxides Toward Durable Oxygen Evolution Reaction in Acidic Electrolyte'. Together they form a unique fingerprint.

Cite this