Anodic oxidation of formic acid on PdAuIr /C-Sb2O5·SnO2 electrocatalysts prepared by borohydride reduction

作     者：A. O. Neto J. Nandenha R. F. B. De Souza G. S Buzzo J. C. M . Silva E. V. Spinacé M . H. M . T. Assumpo 

作者机构：Instituto de Pesquisas Energeticas e Nucleares-IPEN-CNEN/SP Cidade UniversitCtria Sao Paulo 05508-900 Brazil 

出 版 物：《燃料化学学报》 (Journal of Fuel Chemistry and Technology)

年 卷 期：2014年第42卷第7期

页      面：851-857页

核心收录：

学科分类：0808[工学-电气工程] 08[工学] 

基　　金：the Laboratório de Microscopia do Centro de Ciências e Tecnologia de Materiais(CCTM) by TEM measurements FAPESP(2011/18246-0 2012/03516-5) and CNPQ(150639/2013-9)for the financial support 

主　　题：PdAuIr/C—Sb2O5·SnO2 甲酸氧化 燃料电池 电力 

摘      要：PdAuIr/C-Sb2O5·SnO2electrocatalysts with Pd∶Au∶Ir molar ratios of 90∶5∶5,70∶20∶10 and 50∶45∶5 were prepared by borohydride reduction *** electrocatalysts were characterized by EDX,X-ray diffraction,transmission electron microscopy and the catalytic activity toward formic acid electro-oxidation in acid medium investigated by cyclic voltammetry(CV),chroamperometry(CA)and tests on direct formic acid fuel cell(DFAFC)at 100℃.X-ray diffractograms of PdAuIr/C-Sb2O5·SnO2electrocatalysts showed the presence of Pd fcc phase,Pd-Au fcc alloys,carbon and ATO phases,while Ir phases were not *** micrographs and histograms indicated that the nanoparticles were not well dispersed on the support and some *** cyclic voltammetry and chroamperometry studies showed that PdAuIr/C-Sb2O5·SnO2(50∶45∶5)had superior performance toward formic acid electro-oxidation at 25℃compared to PdAuIr/C-Sb2O5·SnO2(70∶20∶10),PdAuIr/C-Sb2O5·SnO2(90∶5∶5)and Pd/C-Sb2O5·*** experiments in a single DFAFC also showed that all PdAuIr/C-Sb2O5·SnO2electrocatalysts exhibited higher performance for formic acid oxidation in comparison with Pd/C-Sb2O5·SnO2electrocatalysts,however PdAuIr/C-Sb2O5·SnO2(90∶5∶5)had superior *** results indicated that the addition of Au and Ir to Pd favor the electro-oxidation of formic acid,which could be attributed to the bifunctional mechanism(the presence of ATO,Au and Ir oxides species)associated to the electronic effect(Pd-Au fcc alloys).