Role of the Metal-Oxide Support in the Catalytic Activity of Pd Nanoparticles for Ethanol Electrooxidation in Alkaline Media
Role of the Metal-Oxide Support in the Catalytic Activity of Pd Nanoparticles for Ethanol Electrooxidation in Alkaline Media
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DOI：
10.1002/celc.201500432
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发表时间：
2016-02-01
期刊：
影响因子：
4
通讯作者：
Baranova, Elena A.
中科院分区：
文献类型：
--
作者：
Monyoncho, Evans Angwenyi;Ntais, Spyridon;Baranova, Elena A.
介绍了氧化物载体（CeO2、SnO2、TiO2）对碱性介质中 Pd 纳米颗粒 (NP) 上乙醇电氧化的促进作用，并与碳上的 Pd 进行了比较。 XPS 显示，当 Pd NP 沉积在金属氧化物上时，Pd3d 峰的结合能发生转变，这意味着电荷从氧化物转移到 Pd。通过使用循环伏安法和计时电流法评估负载纳米粒子对乙醇电氧化的催化活性。使用偏振调制红外反射吸收光谱（PM-IRRAS）原位监测电氧化产物，结果表明载体影响钯反应的选择性。与其他三种载体相比，Pd/CeO2 对破坏 C-C 键以产生 CO2 具有优异的选择性。作为产物的乙酸盐在所有催化剂上都很明显，但比例不同。金属氧化物负载的 Pd 显示出更高的活性，特别是 CeO2 和 SnO2 脱颖而出，成为最佳载体。
The promotional role of oxide supports (CeO2, SnO2, TiO2) on ethanol electrooxidation in alkaline media over Pd nanoparticles (NPs) is presented and compared to Pd on carbon. XPS revealed a shift to lower binding energy of the Pd3d peak when Pd NPs were deposited on metal oxides, implying a charge transfer from the oxides to the Pd. The catalytic activity of the supported NPs for ethanol electrooxidation was assessed by using cyclic voltammetry and chronoamperometry. The electrooxidation products were monitored insitu, using polarization modulation-infrared reflection absorption spectroscopy (PM-IRRAS), which revealed that the supports influence the selectivity of reactions on Pd. Pd/CeO2 has superior selectivity towards breaking the C-C bond to produce CO2 compared to the other three supports. Acetate, as a product, was evident on all of the catalysts, but at different ratios. Pd supported on metal oxides showed higher activity and, in particular, CeO2 and SnO2 stand out as the best supports.