Li Ting, Liu Yidan, Huang Yibin, Yu Zhong, Huang Lei
Jiangxi Province Key Laboratory of Applied Optical Technology (2024SSY03051), School of Physical Science and Intelligent Education, Shangrao Normal University, Shangrao 334001, China.
International Institute of Silk, College of Textile Science and Engineering, Zhejiang Sci-Tech University, Hangzhou 310018, China.
Molecules. 2024 Aug 7;29(16):3753. doi: 10.3390/molecules29163753.
Developing novel catalysts with high activity and high stability for the methanol oxidation reaction (MOR) is of great importance for the ever-broader applications of methanol fuel cells. Herein, we present a facile technique for synthesizing AuPt@MnO catalysts using a wet chemical method and investigate their catalytic performance for the MOR. Notably, the AuPt@MnO-M composite demonstrated a significantly high peak mass activity of 15.52 A mg(Pt), which is 35.3, 57.5, and 21.9 times greater than those of the Pt/C (0.44 A mg(Pt)), Pd/C (0.27 A mg(Pt)), and AuPt (0.71 A mg(Pt)) catalysts, respectively. Comparative analysis with commercial Pt/C and Pd/C catalysts, as well as AuPt HSNRs, revealed that the AuPt@MnO-M composite exhibited the lowest initial potential, the highest peak current density, and superior CO anti-poisoning capability. The results demonstrate that the introduction of MnO nanosheets, with excellent oxidation capability, not only significantly increases the reactive sites, but also promotes the reaction kinetics of the catalyst. Furthermore, the high surface area of the MnO nanosheets facilitates charge transfer and induces modifications in the electronic structure of the composite. This research provides a straightforward and effective strategy for the design of efficient electrocatalytic nanostructures for MOR applications.
开发具有高活性和高稳定性的新型甲醇氧化反应（MOR）催化剂对于甲醇燃料电池日益广泛的应用具有重要意义。在此，我们展示了一种使用湿化学方法合成AuPt@MnO催化剂的简便技术，并研究了它们对MOR的催化性能。值得注意的是，AuPt@MnO-M复合材料表现出高达15.52 A mg(Pt)的显著高峰质量活性，分别是Pt/C（0.44 A mg(Pt)）、Pd/C（0.27 A mg(Pt)）和AuPt（0.71 A mg(Pt)）催化剂的35.3倍、57.5倍和21.9倍。与商业Pt/C和Pd/C催化剂以及AuPt HSNRs的对比分析表明，AuPt@MnO-M复合材料表现出最低的初始电位、最高的峰值电流密度和优异的抗CO中毒能力。结果表明，引入具有优异氧化能力的MnO纳米片不仅显著增加了反应位点，还促进了催化剂的反应动力学。此外，MnO纳米片的高表面积有助于电荷转移，并引起复合材料电子结构的改变。这项研究为设计用于MOR应用的高效电催化纳米结构提供了一种直接有效的策略。
