Yang Yi, Guo Yi-Fei, Fu Ce, Zhang Rong-Hua, Zhan Wei, Wang Pan, Zhang Xin, Wang Qi, Zhou Xin-Wen
College of Biological and Pharmaceutical Sciences, China Three Gorges University, Yichang 443002, China; School of Engineering Sciences in Chemistry, Biotechnology and Health, KTH Royal Institute of Technology, Stockholm 10044, Sweden.
College of Biological and Pharmaceutical Sciences, China Three Gorges University, Yichang 443002, China.
J Colloid Interface Sci. 2021 Aug;595:107-117. doi: 10.1016/j.jcis.2021.03.129. Epub 2021 Mar 24.
A perfect PtCu nanocube with partial hollow structure was prepared by hydrothermal reaction and its electrocatalytic methanol oxidation reaction (MOR) was studied. The appropriate concentration of shape-control additives KI and triblock pluronic copolymers, poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) (PEO-PPO-PEO) (P123) play crucial roles in the final product morphology. The PtCu nanocubes can be perfectly in situ immobilizedonto graphene under the action of P123 while the structure and cubic morphologyremain unchanged. The electrochemical tests suggest that the obtained PtCu nanocube (PtCu-NCb) exhibits better MOR activity and stability than PtCu hexagon nanosheet (PtCu-NSt), PtCu nanoellipsoid (PtCu-NEs) and commercial Pt/C in alkaline medium. When in situ immobilized onto graphene, the MOR catalytic activity and stability of PtCu cubes are further improved. The markedly enhanced electrocatalytic activity and durability maybe attributed to the special cubic morphology with partial hollow structure enclosed by highly efficient facet and the probably the synergistic effect of PtCu and intermediate state CuI decorated on the surface and graphene.
通过水热反应制备了具有部分中空结构的完美PtCu纳米立方体，并研究了其电催化甲醇氧化反应（MOR）。形状控制添加剂KI和三嵌段普朗尼克共聚物聚（环氧乙烷）-聚（环氧丙烷）-聚（环氧乙烷）（PEO-PPO-PEO）（P123）的适当浓度对最终产物的形态起着关键作用。在P123的作用下，PtCu纳米立方体可以完美地原位固定在石墨烯上，同时结构和立方形态保持不变。电化学测试表明，所制备的PtCu纳米立方体（PtCu-NCb）在碱性介质中比PtCu六边形纳米片（PtCu-NSt）、PtCu纳米椭球体（PtCu-NEs）和商业Pt/C表现出更好的MOR活性和稳定性。当原位固定在石墨烯上时，PtCu立方体的MOR催化活性和稳定性进一步提高。显著增强的电催化活性和耐久性可能归因于具有由高效晶面围成的部分中空结构的特殊立方形态，以及表面修饰的PtCu和中间态CuI与石墨烯之间可能的协同效应。
