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Mn-Dopant Differentiating the Ru and Ir Oxidation States in Catalytic Oxides Toward Durable Oxygen Evolution Reaction in Acidic Electrolyte.
Joo, Jinwhan; Park, YeJi; Kim, Jun; Kwon, Taehyun; Jun, Minki; Ahn, Docheon; Baik, Hionsuck; Jang, Jong Hyun; Kim, Jin Young; Lee, Kwangyeol.
Afiliación
  • Joo J; Department of Chemistry and Research Institute for Natural Sciences, Korea University, Seoul, 02841, Republic of Korea.
  • Park Y; Department of Chemistry and Research Institute for Natural Sciences, Korea University, Seoul, 02841, Republic of Korea.
  • Kim J; Center for Hydrogen & Fuel Cell Research, Korea Institute of Science and Technology (KIST), Seoul, 02792, Republic of Korea.
  • Kwon T; Department of Chemistry and Research Institute for Natural Sciences, Korea University, Seoul, 02841, Republic of Korea.
  • Jun M; Department of Chemistry and Research Institute for Natural Sciences, Korea University, Seoul, 02841, Republic of Korea.
  • Ahn D; Beamline Department, Pohang Accelerator Laboratory, Pohang, 37673, Republic of Korea.
  • Baik H; Korea Basic Science Institute (KBSI), Seoul, 02841, Republic of Korea.
  • Jang JH; Center for Hydrogen & Fuel Cell Research, Korea Institute of Science and Technology (KIST), Seoul, 02792, Republic of Korea.
  • Kim JY; Center for Hydrogen & Fuel Cell Research, Korea Institute of Science and Technology (KIST), Seoul, 02792, Republic of Korea.
  • Lee K; Department of Chemistry and Research Institute for Natural Sciences, Korea University, Seoul, 02841, Republic of Korea.
Small Methods ; 6(1): e2101236, 2022 Jan.
Article en En | MEDLINE | ID: mdl-35041273
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.
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Texto completo: 1 Colección: 01-internacional Banco de datos: MEDLINE Idioma: En Revista: Small Methods Año: 2022 Tipo del documento: Article

Texto completo: 1 Colección: 01-internacional Banco de datos: MEDLINE Idioma: En Revista: Small Methods Año: 2022 Tipo del documento: Article