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Research Article

Low-coordinated surface sites make truncated Pd tetrahedrons as robust ORR electrocatalysts outperforming Pt for DMFC devices

Xiaoling Wang1Jingwei Li4Xiaotong Yang1Fengling Zhao1Yongfei Li2Daliang Zhang4Li-Yong Gan2,5( )Ke Xin Yao2,4( )Qiang Yuan1,3( )
State-Local Joint Laboratory for Comprehensive Utilization of Biomass, Center for R&D of Fine Chemicals, College of Chemistry and Chemical Engineering, Guizhou University, Guiyang 550025, China
State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China
Key Lab of Organic Optoelectronics & Molecular Engineering, Tsinghua University, Beijing 100084, China
Multi-scale Porous Materials Center, Institute of Advanced Interdisciplinary Studies & School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, China
College of Physics and Center of Quantum Materials and Devices, Chongqing University, Chongqing 401331, China
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Graphical Abstract

Truncated Pd tetrahedrons (T-Pd-Ths) rich in low-coordinated surface sites and lattice distortions with a size of around 13.4 nm have been successfully synthesized. The T-Pd-Ths/C as highly active and stable oxygen reduction reaction (ORR) electrocatalyst exhibits superior power output to commercial Pt/C from 25 to 80 °C.

Abstract

Developing highly stable and active non-Pt oxygen reduction reaction (ORR) electrocatalysts for power generation device raises great concerns and remains a challenge. Here, we report novel truncated Pd tetrahedrons (T-Pd-Ths) enclosed by {111} facets with excellent uniformity, which have both low-coordinated surface sites and distinct lattice distortions that would induce “local strain”. In alkaline electrolyte, the T-Pd-Ths/C achieves remarkable ORR specific/mass activity (SA/MA) of 2.46 mA·cm−2/1.69 A·mgPd−1, which is 12.3/16.9 and 10.7/14.1 times higher than commercial Pd/C and Pt/C, respectively. The T-Pd-Ths/C also exhibits high in-situ carbon monoxide (CO) tolerance and 50,000 cycles durability with an activity loss of 7.69% and morphological stability. The rotating ring-disk electrode (RRDE) measurements show that a 4-electron process occurs on T-Pd-Ths/C. Theoretical calculations demonstrate that the low-coordinated surface sites contribute largely to the enhancement of ORR activity. In actual direct methanol fuel cell (DMFC) device, the T-Pd-Ths/C delivers superior open-circuit voltage (OCV) and peak power density (PPD) to commercial Pt/C from 25 to 80 °C, and the maximum PPD can reach up to 163.7 mW·cm−2. This study demonstrates that the T-Pd-Ths/C holds promise as alternatives to Pt for ORR in DMFC device.

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Nano Research
Pages 7951-7958
Cite this article:
Wang X, Li J, Yang X, et al. Low-coordinated surface sites make truncated Pd tetrahedrons as robust ORR electrocatalysts outperforming Pt for DMFC devices. Nano Research, 2022, 15(9): 7951-7958. https://doi.org/10.1007/s12274-022-4492-2
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Received: 29 March 2022
Revised: 24 April 2022
Accepted: 01 May 2022
Published: 23 June 2022
© Tsinghua University Press 2022
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