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Research Article

Interface-rich Au-doped PdBi alloy nanochains as multifunctional oxygen reduction catalysts boost the power density and durability of a direct methanol fuel cell device

Xin Li1, Ke Xin Yao2, Fengling Zhao1, Xiaotong Yang1, Jingwei Li4, Yongfei Li2, 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
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Graphical Abstract

Interface-rich Au-doped PdBi (PdBiAu), one-dimensional (1D) alloy nanochains have been achieved using an “active auxiliary” strategy via a one-step liquid route. The PdBiAu alloy nanochains as multifunctional oxygen reduction reaction (ORR) catalysts boost the power density and durability of a direct methanol fuel cell device.

Abstract

The development of cathode oxygen reduction reaction (ORR) catalysts with high characteristics for practical, direct methanol fuel cells (DMFCs) has continuously increased the attention of researchers. In this work, interface-rich Au-doped PdBi (PdBiAu) branched one-dimensional (1D) alloyed nanochains assembled by sub-6.5 nm particles have been prepared, exhibiting an ORR mass activity (MA) of 6.40 A·mgPd−1 and long-term durability of 5,000 cycles in an alkaline medium. The MA of PdBiAu nanochains is 46 times and 80 times higher than that of commercial Pt/C (0.14 A·mgPt−1) and Pd/C (0.08 A·mgPd−1). The MA of binary PdBi nanochains also reaches 5.71 A·mgPd−1. Notably, the PdBiAu nanochains exhibit high in-situ carbon monoxide poisoning resistance and high methanol tolerance. In actual DMFC device tests, the PdBiAu nanochains enhance power density of 140.1 mW·cm−2 (in O2)/112.4 mW·cm−2 (in air) and durability compared with PdBi nanochains and Pt/C. The analysis of the structure–function relationship indicates that the enhanced performance of PdBiAu nanochains is attributed to integrated functions of surficial defect-rich 1D chain structure, improved charge transfer capability, downshift of the d-band center of Pd, as well as the synergistic effect derived from “Pd-Bi” and/or “Pd-Au” dual active sites.

Keywords

Au-doped PdBi (PdBiAu) nanochainsone-dimensional structureactive auxiliaryoxygen reduction reactiondirect methanol fuel cells

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Nano Research
Volume 15 Issue 7,
July 2022
Pages 6036-6044
DOI: 10.1007/s12274-022-4299-1
Cite this article:
Li X, Yao KX, Zhao F, et al. Interface-rich Au-doped PdBi alloy nanochains as multifunctional oxygen reduction catalysts boost the power density and durability of a direct methanol fuel cell device. Nano Research, 2022, 15(7): 6036-6044. https://doi.org/10.1007/s12274-022-4299-1
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Received: 09 January 2022
Revised: 20 February 2022
Accepted: 04 March 2022
Published: 20 April 2022
© Tsinghua University Press 2022
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