期刊
NANO RESEARCH
卷 15, 期 7, 页码 6036-6044出版社
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-022-4299-1
关键词
Au-doped PdBi (PdBiAu) nanochains; one-dimensional structure; active auxiliary; oxygen reduction reaction; direct methanol fuel cells
类别
资金
- National Natural Science Foundation of China [21571038]
- Foundation of Guizhou Province [2019-5666]
- Education Department of Guizhou Province [2021312]
- State Key Laboratory of Coal Mine Disaster Dynamics and Control (Chongqing University) [2011DA105287-ZR202101]
- Open Fund of the Key Lab of Organic Optoelectronics & Molecular Engineering (Tsinghua University)
- State Key Laboratory of Physical Chemistry of Solid Surfaces [202009]
In this study, interface-rich Au-doped PdBi (PdBiAu) nanochains with high ORR activity, durability, and methanol tolerance were prepared. In actual DMFC device tests, PdBiAu nanochains outperformed PdBi nanochains and Pt/C catalysts.
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.mg(Pd)(-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 center dot mg(Pt)(-1)) and Pd/C (0.08 A.mg(Pd)(-1)). The MA of binary PdBi nanochains also reaches 5.71 A.mg(Pd)(-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 O-2)/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.
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