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Article

Covalently Bonded Ir(IV) on Conducted Blue TiO2 for Efficient Electrocatalytic Oxygen Evolution Reaction in Acid Media

by 1,2,†, 1,†, 1,2 and 1,2,3,4,*
1
Center for Integrated Nanostructure Physics, Institute for Basic Science (IBS), Sungkyunkwan University, Suwon 16419, Korea
2
Department of Chemistry, Sungkyunkwan University, Suwon 16419, Korea
3
Department of Biophysics, Sungkyunkwan University, Suwon 16419, Korea
4
Creative Research Institute, Sungkyunkwan University, Suwon 16419, Korea
*
Author to whom correspondence should be addressed.
Contribute equally to this work.
Academic Editor: Nicolas Alonso-Vante
Catalysts 2021, 11(10), 1176; https://doi.org/10.3390/catal11101176
Received: 3 September 2021 / Revised: 23 September 2021 / Accepted: 27 September 2021 / Published: 28 September 2021
The stability of anode electrode has been a primary obstacle for the oxygen evolution reaction (OER) in acid media. We design Ir-oxygen of hydroxyl-rich blue TiO2 through covalent bonds (Ir–O2–2Ti) and investigate the outcome of favored exposure of different amounts of covalent Ir–oxygen linked to the conductive blue TiO2 in the acidic OER. The Ir-oxygen-blue TiO2 nanoclusters show a strong synergy in terms of improved conductivity and tiny amount usage of Ir by using blue TiO2 supporter, and enhanced stability using covalent Ir-oxygen-linking (i.e., Ir oxide) in acid media, leading to high acidic OER performance with a current density of 10 mA cm−2 at an overpotential of 342 mV, which is much higher than that of IrO2 at 438 mV in 0.1 M HClO4 electrolyte. Notably, the Ir–O2–2Ti has a great mass activity of 1.38 A/mgIr at an overpotential 350 mV, which is almost 27 times higher than the mass activity of IrO2 at the same overpotential. Therefore, our work provides some insight into non-costly, highly enhanced, and stable electrocatalysts for the OER in acid media. View Full-Text
Keywords: acidic OER; blue TiO2; iridium nanoclusters; mass activity acidic OER; blue TiO2; iridium nanoclusters; mass activity
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MDPI and ACS Style

Nguyen, C.T.K.; Tran, N.Q.; Le, T.A.; Lee, H. Covalently Bonded Ir(IV) on Conducted Blue TiO2 for Efficient Electrocatalytic Oxygen Evolution Reaction in Acid Media. Catalysts 2021, 11, 1176. https://doi.org/10.3390/catal11101176

AMA Style

Nguyen CTK, Tran NQ, Le TA, Lee H. Covalently Bonded Ir(IV) on Conducted Blue TiO2 for Efficient Electrocatalytic Oxygen Evolution Reaction in Acid Media. Catalysts. 2021; 11(10):1176. https://doi.org/10.3390/catal11101176

Chicago/Turabian Style

Nguyen, Chau T. K., Ngoc Quang Tran, Thi Anh Le, and Hyoyoung Lee. 2021. "Covalently Bonded Ir(IV) on Conducted Blue TiO2 for Efficient Electrocatalytic Oxygen Evolution Reaction in Acid Media" Catalysts 11, no. 10: 1176. https://doi.org/10.3390/catal11101176

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