催化剂的性能
(湘潭大学 化学学院 环境友好化学与应用教育部重点实验室，湘潭 411105)
摘 要: 采用浸渍还原法制备不同比例的AuPd/C纳米粒子；分别采用X线衍射仪(XRD)和透射电镜(TEM)对催化剂进行结构和形貌分析；利用CHI660a电化学工作站对催化剂进行电化学测试，结果表明：催化剂材料均为面心立方结构，AuPd/C中纳米合金粒子的粒径为5 nm左右，比Au/C中的纳米Au粒子更小，且均匀分散在VXC−72R炭黑的表面；Au/C的峰电流密度为25.05 mA/cm2，与Au/C相比，AuPd/C明显提高NaBH4的电氧化催化活性；以纳米AuPd/C为阳极催化剂、Au/C为阴极催化剂制成直接NaBH4-H2O2燃料电池(DBHFC)，发现以Au1Pd2/C为阳极催化剂的DBHFC拥有良好的电池性能；在温度为60 ℃、NaBH4浓度为1 mol/L时DBHFC的最大功率密度达到114.6 mW/cm2。
关键字: 直接NaBH4-H2O2燃料电池；AuPd/C；纳米粒子；阳极催化剂
direct NaBH4-H2O2 fuel cell
（Key Laboratory of Environmentally Friendly Chemistry and Applications, Ministry of Education,
School of Chemistry, Xiangtan University, Xiangtan 411105, China）
Abstract:The nanosized AuPd alloys were prepared by impregnation method. The structure and surface morphology were characterized by X-ray diffractometry (XRD) and transmission electron microscopy (TEM). The electrochemical performance was tested by a CHI660a Electrochemistry Workstation. The results show that the nanosized electrocatalyst particles have face cubic structure and uniformly distribute on the surfaces of the VXC−72R carbon black. The size of the AuPd alloys particles is about 5 nm, which is apparently less than that of the Au particles. The peak current density of Au/C is 25.05 mA/cm2 and compared to pure Au/C catalyst, AuPd/C catalysts distinctly enhance the catalytic activity for the direct oxidation of NaBH4. A simple direct borohydride-hydrogen peroxide fuel cell (DBHFC) is fabricated in which the Au/C is used as the cathode catalyst and the AuPb/C is used as the anode catalyst. The Au1Pd2/C catalytic anode presents the highest catalytic activity among the AuPd/C alloys studied and the DBHFC shows as high as 114.6 mW/cm2 power density at 1 mol/L NaBH4 and 60 ℃.
Key words: direct borohydride-hydrogen peroxide fuel cell; AuPd/C; nanosized particles; anode electrocatalyst
