微波辐照快速合成Pd/石墨烯纳米复合材料及其对甲醇氧化的电催化性能  

Rapid Synthesis of Palladium/Graphene Nanocomposites via Microwave Irradiation and Their Electrocatalytic Oxidation of Methanol

作　　者：杨木泉 张旋 颜悦 YANG Mu-Quan;ZHANG Xuan;YAN Yue(Affiliation Beijing Institute of Aeronautical Materials,Beijing Engineering Research Centre of Advanced Structure Transparencies for the Modern Traffic System,Beijing 100095,China)

机构地区：[1]北京市先进运载系统结构透明件工程技术研究中心,北京航空材料研究院,北京100095

出　　处：《分析化学》2018年第12期1968-1974,共7页Chinese Journal of Analytical Chemistry

基　　金：国家自然科学基金项目(No.51702305)资助。

摘　　要：通过微波辅助"一锅合成"的方法,利用环境友好、价格低廉的表没食子儿茶素(EGCG)为还原剂,快速制备了钯/石墨烯(Pd/GN)纳米复合材料,通过控制反应物比例和微波辐照时间对负载在石墨烯上的Pd纳米粒子的尺寸及负载量进行调控。实验结果表明,此Pd/GN纳米复合结构中,Pd纳米粒子均匀分散在石墨烯表面,当氧化石墨(GO)添加量为0.25 m L、微波辐照时间为1 min时,Pd纳米粒子的平均粒径约为10 nm。电化学测试结果表明,Pd/GN复合材料催化剂的电化学活性面积(ECSA)达到60. 5 m^2/g,为商用Pd/C催化剂ECSA(30.7 m^2/g)的1.97倍。另外,在碱性条件下,通过循环伏安法(CV)和计时电流法(CA)研究了Pd/GN的电化学催化甲醇氧化过程,结果表明,与商业Pd/C催化剂相比,Pd/GN催化剂的电催化活性和稳定性都大大提高,当催化剂负载量为15.5μg/cm2时,氧化电流密度峰值达到7.95 mA/cm^2。合成的Pd/GN材料具有优异电催化性能,在甲醇燃料电池领域有良好的应用前景。Palladium/graphene nanocomposites(Pd/GN)were synthesized through a rapid,microwave irradiation,“one pot”method with epigallocatechin gallate(EGCG)as a reducing agent.The loading amount and size of Pd nanoparticles in Pd/Graphene nanocomposites could be controlled by the irradiation time and the ratio of the graphite oxide(GO)and H 2PdCl 4.Results showed that Pd nanoparticles were well dispersed on the surface of graphene in Pd/GN nanocomposite.When the additive amount of graphene oxide(GO)was 0.25 mL and the microwave irradiation time was 1 min,the size of Pd nanoparticles was about 10 nm.The electro-catalytic activity of the as-prepared Pd/GN towards the oxidation of methanol was studied by cyclic voltammetry(CV)and chronoamperometry(CA)methods.The electrochemical active area(ECSA)value of Pd/GN nanocomposite catalysts was about 60.5 m 2/g,which was 1.97 times higher than that of the commercial Pd/C catalyst(30.7 m 2/g).The peak current density on the Pd/GN catalyst for methanol oxidation was much larger than that of Pd/C catalyst in the alkaline conditions.When the loading amount of the Pd/GN catalyst was about 15.5μg/cm 2,the value of the oxidation peak current density reached 7.95 mA/cm 2.All the experimental results indicated that the Pd/GN catalyst significantly enhanced catalytic activity and stability than the commercial Pd/C catalyst.

关 键 词：微波辐照 石墨烯复合材料 电催化 甲醇氧化 

分 类 号：O643.36[理学—物理化学] TB33[理学—化学]