摘要
A facile in situ redox strategy has been developed to fabricate surfactant-free M-Fe_2O_3(M = Pt, Pd, Au) hybrid nanospheres. In this process, noble metal salts were directly reduced by the pre-prepared Fe_3O_4 components in an alkaline aqueous solution without using organic reductants and surfactants. During the redox reaction, Fe_3O_4 was oxidized into Fe_2O_3,and the reduzates of noble metal nanoparticles were deposited on the surface of the Fe_2O_3 nanospheres. Then the characterizations were discussed in detail to study the formation of M-Fe_2O_3 hybrids. At last, catalytic CO oxidation was selected as a model reaction to evaluate the catalytic performance of these samples.It demonstrates that Pt-Fe_2O_3 nanospheres can catalyze 100 % conversion of CO into CO_2 at 90°C, indicating superior activity relative to Pd-Fe_2O_3 and Au-Fe_2O_3.
本工作利用原位氧化还原策略,成功制备出无表面活性剂修饰的M-Fe_2O_3(M=Pt,Pd,Au)杂化纳米球.在反应过程中,以事先制备好的Fe_3O_4纳米球作为载体和还原剂,在碱性条件下直接还原高价态的贵金属盐前躯体.反应后,Fe_3O_4被氧化成Fe_2O_3,而贵金属纳米粒子作为还原产物则牢牢的沉积在氧化产物Fe_2O_3表面形成M-Fe_2O_3杂化纳米球.通过表征系统研究了所得产物的形貌、结构和催化性质.并以CO催化氧化为模型反应对产物进行评估,结果表明,样品Pt-Fe_2O_3在90°C即可将CO 100%催化转化为CO_2,相比Pd-Fe_2O_3和Au-Fe_2O_3具有更高的催化活性.
基金
supported by the Fundamental Research Funds for the Central Universities
the National Natural Science Foundation of China(51272249,51372007 and 21301014)
the China Postdoctoral Science Foundation funded project
