Highly Active and Durable PtIr Nanoparticles Toward Oxygen Reduction and Oxygen Evolution Reaction

doi:10.1007/s40242-025-5070-4

Chemical Research in Chinese Universities ›› 2025, Vol. 41 ›› Issue (5): 1217-1224.doi: 10.1007/s40242-025-5070-4

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Highly Active and Durable PtIr Nanoparticles Toward Oxygen Reduction and Oxygen Evolution Reaction

HAN Shuo¹, LV Yang¹, YANG Mengyu¹, LI Yongpeng¹, TAN Cui², LIU Feng³, YANG Hao¹, CHU Jianan¹, LIU Miao¹, ZHU Chengyu¹, GAO Rui¹, SONG Yujiang¹

1. State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, P. R. China;
2. Chemistry Analysis & Research Center, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, P. R. China;
3. Instrumental Analysis & Research Center, Dalian University of Technology · Panjin, Panjin 124221, P. R. China

Received:2025-04-19 Accepted:2025-05-23 Online:2025-10-01 Published:2025-09-26
Contact: SONG Yujiang, E-mail: yjsong@dlut.edu.cn;LV Yang, E-mail: yanglv@dlut.edu.cn E-mail:yjsong@dlut.edu.cn;yanglv@dlut.edu.cn
Supported by:
This work was supported by the National Natural Science Foundation of China (No. 22278057), the Science and Technology Major Project of Liaoning Province, China (No. 2024JH1/11700015), and the Science & Technology Innovation Funds of Dalian, China (No. 2024JJ12CG028).

Abstract

Abstract: Design and synthesis of highly active and durable bifunctional electrocatalysts is crucial toward oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) in unitized regenerative proton exchange membrane fuel cells (UR-PEMFCs). Herein, we report a simple phase-transfer reduction method to synthesize PtIr nanoparticles with different molar ratios. When the Pt/Ir molar ratio is 2.2:1, the bifunctional oxygen activity is optimal. The ORR mass activity of Pt_2.2Ir nanoparticles is 190.3 mA/mg_Pt @ 0.9 V (vs. RHE), which is 1.8 times and 3.7 times those of commercial Pt black and physically mixed commercial Pt and Ir black (Pt+Ir black), respectively. At the potential of 1.53 V vs. RHE, the OER mass activity of Pt_2.2Ir nanoparticles is 202.7 mA/mgIr, which is 2.0 times and 1.3 times those of Ir black and Pt+Ir black, respectively. An overpotential gap of Pt_2.2Ir nanoparticles (618 mV) between the half-wave potential of ORR and the potential at 10 mA/cm² of OER is superior to Pt+Ir black (662 mV). After durability tests, the ORR/OER activity of Pt_2.2Ir nanoparticles remained much better than Pt+Ir black. X-Ray photoelectron spectroscopy suggests that the electronic interaction between Pt and Ir accounts for enhanced bifunctional oxygen activity. Eventually, the Pt_2.2Ir nanoparticles were evaluated in UR-PEMFCs.

Key words: Unitized regenerative proton exchange membrane fuel cell, Oxygen reduction reaction, Oxygen evolution reaction, Bifunctional oxygen electrocatalyst

HAN Shuo, LV Yang, YANG Mengyu, LI Yongpeng, TAN Cui, LIU Feng, YANG Hao, CHU Jianan, LIU Miao, ZHU Chengyu, GAO Rui, SONG Yujiang. Highly Active and Durable PtIr Nanoparticles Toward Oxygen Reduction and Oxygen Evolution Reaction[J]. Chemical Research in Chinese Universities, 2025, 41(5): 1217-1224.

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Highly Active and Durable PtIr Nanoparticles Toward Oxygen Reduction and Oxygen Evolution Reaction

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