Department of Chemistry, Brown University, Providence, Rhode Island 02912, USA.
Nanoscale. 2017 Jun 14;9(23):7745-7749. doi: 10.1039/c7nr02711g.
We report an electrochemical method to deposit atomic scale Pt on a 5 nm Au nanoparticle (NP) surface in N-saturated 0.5 M HSO. Pt is provided by the Pt wire counter electrode via one-step Pt wire oxidation, dissolution, and deposition realized by controlled electrochemical scanning. Scanning from 0.6-1.0 V (vs. RHE) for 10 000 cycles gives AuPt, which serves as an excellent catalyst for the formic acid oxidation reaction, showing 41 times higher specific activity (20.19 mA cm) and 25 times higher mass activity (10.80 A mg) with much better CO-tolerance and stability than commercial Pt. Our work demonstrates a unique strategy to minimize the use of Pt as a catalyst for electrochemical reactions.
我们报告了一种电化学方法，用于在 N 饱和的 0.5 M HSO 中在 5nm Au 纳米颗粒（NP）表面上沉积原子级 Pt。Pt 通过一步 Pt 丝氧化、溶解和沉积由控制电化学扫描实现，由 Pt 丝对电极提供。在 0.6-1.0 V（相对于 RHE）下扫描 10000 个循环得到 AuPt，其作为甲酸氧化反应的优异催化剂，比商业 Pt 具有高 41 倍的比活性（20.19 mA cm）和高 25 倍的质量活性（10.80 A mg），且具有更好的 CO 耐受性和稳定性。我们的工作展示了一种独特的策略，可最大程度地减少 Pt 在电化学反应中的使用量。
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