Jin Changchun, Sun Chao, Dong Rulin, Chen Zhidong
Jiangsu Key Laboratory of Fine Petro-Chemicals, Department of Applied Chemistry, Changzhou University, Jiangsu 213164, China.
J Nanosci Nanotechnol. 2012 Jan;12(1):324-9. doi: 10.1166/jnn.2012.5147.
The electrocatalytic oxidation of glycerol on PtAu/C catalysts has been investigated by cyclic voltammetry. PtAu bimetallic nanoparticles are prepared by chemical reduction. Carbon-supported PtAu catalysts are found to exhibit high electrocatalytic activity for the oxidation of glycerol in alkaline solution in terms of oxidation potential and current density as well as stability, and PtAu/C catalysts with different Pt:Au composition ratios show no much difference in catalytic activity. In acidic solution, PtAu/C catalysts exhibit similar to Pt/C catalysts in activity, but the advantage of the PtAu/C catalysts in terms of per unit mass of platinum is still obvious. The PtAu/C catalysts, in a wide Pt:Au ratio range, show a remarkable enhancement in the mass specific activity of platinum with decreasing platinum content in both alkaline and acidic solutions. This is of significance for reducing the usage of platinum and indicates that though platinum acts as main active sites, gold also plays an important role in the function of PtAu/C catalysts.
通过循环伏安法研究了甘油在PtAu/C催化剂上的电催化氧化。采用化学还原法制备了PtAu双金属纳米颗粒。发现碳载PtAu催化剂在碱性溶液中对甘油氧化具有高电催化活性，在氧化电位、电流密度以及稳定性方面表现出色，并且不同Pt:Au组成比的PtAu/C催化剂在催化活性上没有太大差异。在酸性溶液中，PtAu/C催化剂在活性方面与Pt/C催化剂相似，但PtAu/C催化剂在每单位质量铂方面的优势仍然明显。在较宽的Pt:Au比例范围内，PtAu/C催化剂在碱性和酸性溶液中均表现出随着铂含量降低，铂的质量比活性显著增强。这对于减少铂的用量具有重要意义，表明尽管铂作为主要活性位点，但金在PtAu/C催化剂的功能中也起着重要作用。
