Guo Jiangbin, Yan Qiyu, Zhang Man, Fang Jun, Luo Shuiyuan, Xu Jing
College of Chemical Engineering and Materials, Quanzhou Normal University Quanzhou Fujian 362000 P. R. China
State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Fudan University Shanghai 200433 P. R. China.
Nanoscale Adv. 2024 Aug 8;6(20):5106-11. doi: 10.1039/d4na00210e.
Composition and morphology are crucial factors in the design of Pt-based catalysts with high performance, particularly in direct methanol fuel cells (DMFCs). Herein, PtRu mesoporous nanospheres (PtRu MNs) with tunable compositions were synthesized a facile method and then deposited on a carbon support to act as electrocatalyst materials for the methanol oxidation reaction (MOR). Superior catalytic activity, better catalytic stability, and good tolerance to CO were achieved by the optimum PtRu (2 : 1) MNs/C catalyst compared with Pt MNs/C. The mass activity on PtRu (2 : 1) MNs/C reached 111.77 mA mg , which was approximately 6.45-fold higher than that of Pt MNs/C (17.33 mA mg ). Meanwhile, PtRu (2 : 1) MNs/C retained much more current density (84.7%) than Pt MNs/C (17.7%) after 500 cycles. The improved catalytic performance is due to several factors, including the formation of a mesoporous nanostructure with abundant active sites and the favorable effects of the Ru species. This work provides guidance toward designing and fabricating effective Pt-based electrocatalysts for DMFC applications.
组成和形态是设计高性能铂基催化剂的关键因素，尤其是在直接甲醇燃料电池（DMFC）中。在此，采用简便方法合成了组成可调的铂钌介孔纳米球（PtRu MNs），然后将其负载在碳载体上，用作甲醇氧化反应（MOR）的电催化剂材料。与Pt MNs/C相比，最佳的PtRu（2∶1）MNs/C催化剂具有优异的催化活性、更好的催化稳定性和对CO的良好耐受性。PtRu（2∶1）MNs/C的质量活性达到111.77 mA mg ，约为Pt MNs/C（17.33 mA mg ）的6.45倍。同时，经过500次循环后，PtRu（2∶1）MNs/C保留的电流密度（84.7%）比Pt MNs/C（17.7%）多得多。催化性能的提高归因于几个因素，包括形成具有丰富活性位点的介孔纳米结构以及Ru物种的有利影响。这项工作为设计和制造用于DMFC应用的有效铂基电催化剂提供了指导。
