Realizing CO-Free Pathway and Boosting Durability on Highly Dispersed Cu-Doped PtBi Nanoalloys towards Methanol Full Electrooxidation
Pt is the most active anodic electrocatalyst for the oxidation of methanol in direct methanol fuel cells (DMFCs), however, the weak resistance to CO or CO-like species poisoning has been a matter of great concern. Therefore, the development of highly durable anode Pt-based electrocatalyst is indispensable for finally large-scale application of DMFCs. Here, we demonstrate that a CO-free pathway, 6-electron full electrooxidation of methanol is realized on highly dispersed Cu-doped PtBi alloy-phase nanocrystal by combining nuclear magnetic resonance (NMR) spectroscopy and in situ fourier transform infrared (FTIR) spectroscopy analysis. A mass activity (MA) of 5.25 A mg-1Pt and 30-hour durability test without current decay are obtained on PtBiCu nanoalloy. The abundant surface defects, downshifting of Pt d-band center and dual active site of “Pt-Bi” and “Pt-Cu” endow the PtBiCu nanoalloy faster oxidation kinetics of methanol, thus enhancing activity and durability. This work provides a new strategy to synthesize alloy-phase PtBiCu nanocrsytal by crystal phase transition as highly efficient and durable anode electrocatalyst for DMFCs.
- This article is part of the themed collection: Journal of Materials Chemistry A HOT Papers