Volume 43, Issue 9 pp. 1093-1097
Communication

Excess dopant effect in platinum-based alloys toward the oxygen electroreduction reaction

Mrinal Kanti Kabiraz

Mrinal Kanti Kabiraz

Department of Chemistry and Green-Nano Materials Research Center, Kyungpook National University, Daegu, South Korea

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Hee Jin Kim

Hee Jin Kim

Department of Chemistry and Green-Nano Materials Research Center, Kyungpook National University, Daegu, South Korea

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Youngmin Hong

Youngmin Hong

Department of Chemistry and Green-Nano Materials Research Center, Kyungpook National University, Daegu, South Korea

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Qiaowan Chang

Qiaowan Chang

Department of Chemical Engineering, Columbia University, New York, New York, USA

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Sang-Il Choi

Corresponding Author

Sang-Il Choi

Department of Chemistry and Green-Nano Materials Research Center, Kyungpook National University, Daegu, South Korea

Department of Hydrogen and Renewable Energy, Kyungpook National University, Daegu, South Korea

CE Square Corp., Daegu, South Korea

Correspondence

Sang-Il Choi, Department of Chemistry and Green-Nano Materials Research Center, Kyungpook National University, Daegu 41566, South Korea.

Email: [email protected]

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First published: 13 July 2022
Citations: 6

Mrinal Kanti Kabiraz and Hee Jin Kim contributed equally to this study.

Funding information: National Research Foundation of Korea, Grant/Award Numbers: 2020R1I1A1A01072100, 2021R1A2C4001411, 2022R1I1A1A01064467

Abstract

Doping the PtNi octahedra with trace amount of transition metals has recently been shown to significantly improve the activity and durability of the oxygen reduction reaction (ORR). However, the role of excessive amounts of doped elements on ORR performance is unclear. In this work, PtNi octahedra were synthesized with and without excess Mo dopant. Also, spherical PtNi nanoparticles containing excess Co dopant were synthesized. The ORR performance revealed that PtNiMo octahedra and PtNiCo nanoparticles showed inferior ORR activities compared to bimetallic PtNi octahedra. Based on the electrochemical analysis, we found that unfavorable oxygen-binding strengths of PtNiMo and PtNiCo catalysts decrease the ORR performances.

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