【作者】 李忠水； 谢易欣； 刘莹； 叶乙祥； 林深；

【Author】 Zhongshui Li;Yixin Xie;Ying Liu;Yixiang Ye;Shen Lin;College of Chem.& Mater.,Fujian Normal Univ.;

【机构】 福建师范大学化学与材料学院；

【摘要】 本文采用微波合成法合成了一系列不同Pt:Au比例的Pt-Au/graphene催化剂（简称Pt-Au/GNs）,微波反应中用乙醇作为还原剂可将K₂PtCl₄、HAuCl₄和氧化石墨（GO）一步法同步还原。而且研究发现当所加入的Au比例较低时,Pt与Au元素在Pt-Au/GNs中可形成异质结的Pt-Au纳米粒子,但随着所加入金的量的进一步增加,过量的Au会形成尺寸较大的Au颗粒。电催化测试分析显示较低Au含量所形成的Pt-Au/GNs催化剂对甲醇氧化反应（MOR）及氧还原反应（ORR）均显示出更高的催化活性及更好的催化稳定性。然而,在外部可见光光照下具有更高Au含量的Pt-Au/GNs催化剂对MOR及ORR会显示出性能更佳的电光催化效应,而且这种协同催化效应会随着催化剂中Au含量的增高而增加。综合考虑下,当Pt:Au的最佳比例为1:0.1时Pt-Au/GNs催化剂可作为同时催化MOR及ORR的双功能高效电光协同催化剂。更多还原

【Abstract】 A facile microwave assisted strategy was used to synthesize a series of Pt–Au/graphene （simplified as Pt–Au/GNs）catalysts with controllable Pt:Au ratios,in which K₂PtCl₄,HAuCl₄ and graphite oxide were synchronously reduced using ethanol as a reducing agent.Pt and Au elements form a heterostructure Pt-Au nanoparticles in Pt–Au/GNs composites when a lower content of Au is added,while with further increasing Au contents the excessive Au particles may easily aggregate into blocks.Electrochemical experiments show that Pt–Au/GNs composites with lower Au content exhibit advantageous electrocatalytic performances and stability towards methanol oxidation reaction （MOR） and oxygen reduction reaction （ORR）.However,under simulated sunlight irradiation,Pt-Au/GNs composites with higher Au content behave superior electro-photo catalytic activities towards MOR and ORR,which is proportional to Au sizes and contents.From the view point of cost and comprehensive effect,Pt–Au/GNs with the optimal Pt:Au ratio of 1:0.1 can serve as an efficient bifunctional electro-photo catalyst for catalyzing MOR and ORR.更多还原