期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 8, 期 23, 页码 11564-11572出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0ta03330h
关键词
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资金
- National Natural Science Foundation of China [21571038]
- Foundation for Excellent Young Scientific and Technological Talents of Guizhou Province [2019-5666]
- Special Fund for Natural Science of Guizhou University [201801]
- Open Fund of the Key Lab of Organic Optoelectronics & Molecular Engineering (Tsinghua University)
Pt is the most active anode electrocatalyst for the oxidation of methanol in direct methanol fuel cells (DMFCs); however, its weak resistance to CO or CO-like species poisoning has been a matter of great concern. Therefore, the development of a highly durable anode Pt-based electrocatalyst is indispensable for large-scale application of DMFCs. Here, we demonstrate that a CO-free pathway, 6-electron full electrooxidation of methanol, is realized in highly dispersed Cu-doped PtBi alloy-phase nanocrystals by combining nuclear magnetic resonance (NMR) spectroscopy andin situFourier transform infrared (FTIR) spectroscopy analysis. A mass activity (MA) of 5.25 A mg(Pt)(-1)and durability for 30 hours without current decay are obtained for the PtBiCu nanoalloys. The abundant surface defects, downshift of the Pt d-band center and the dual active site of Pt-Bi and Pt-Cu endow the PtBiCu nanoalloys with faster methanol oxidation kinetics, thus enhancing activity and durability. This work provides a new strategy to synthesize alloy-phase PtBiCu nanocrystals by crystal phase transition as a highly efficient and durable anode electrocatalyst for DMFCs.
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