催化劑的性能
(湘潭大學(xué) 化學(xué)學(xué)院 環(huán)境友好化學(xué)與應(yīng)用教育部重點實驗室，湘潭 411105)
摘 要: 采用浸漬還原法制備不同比例的AuPd/C納米粒子；分別采用X線衍射儀(XRD)和透射電鏡(TEM)對催化劑進行結(jié)構(gòu)和形貌分析；利用CHI660a電化學(xué)工作站對催化劑進行電化學(xué)測試，結(jié)果表明：催化劑材料均為面心立方結(jié)構(gòu)，AuPd/C中納米合金粒子的粒徑為5 nm左右，比Au/C中的納米Au粒子更小，且均勻分散在VXC−72R炭黑的表面；Au/C的峰電流密度為25.05 mA/cm2，與Au/C相比，AuPd/C明顯提高NaBH4的電氧化催化活性；以納米AuPd/C為陽極催化劑、Au/C為陰極催化劑制成直接NaBH4-H2O2燃料電池(DBHFC)，發(fā)現(xiàn)以Au1Pd2/C為陽極催化劑的DBHFC擁有良好的電池性能；在溫度為60 ℃、NaBH4濃度為1 mol/L時DBHFC的最大功率密度達到114.6 mW/cm2。
關(guān)鍵字: 直接NaBH4-H2O2燃料電池；AuPd/C；納米粒子；陽極催化劑
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
