Preparation and activity of carbon-supported porous platinum as electrocatalyst for methanol oxidation
Preparation and activity of carbon-supported porous platinum as electrocatalyst for methanol oxidation
复制标题
DOI：
10.1016/j.ijhydene.2010.01.024
复制
发表时间：
2010-08
影响因子：
7.2
通讯作者：
Fu Zhao;Weishan Li;Wei-guang Zhang;F. Sun;Zhi-xiang Zhou;X. Xiang
中科院分区：
文献类型：
--
作者：
Fu Zhao;Weishan Li;Wei-guang Zhang;F. Sun;Zhi-xiang Zhou;X. Xiang
本文报道了一种新型的甲醇氧化电催化剂，Vulcan XC-72负载的多孔纳米铂（Ptp/C）。在Ptp/C的制备中，铂前驱体首先被吸附在碳上，然后在乙二醇溶液中被l-抗坏血酸还原。采用透射电镜（TEM）、BET比表面积（BET）、X射线衍射（XRD）、能谱（EDS）、循环伏安（CV）、计时电流（CA）等方法对Ptp/C的结构、形貌及其对甲醇的氧化活性进行了表征，并与硼氢化钠还原的Pts/C电催化剂进行了比较。结果表明，两种催化剂具有相似的颗粒尺寸，但具有不同的铂表面形貌，因此对甲醇氧化表现出不同的电催化活性。两种电催化剂的铂颗粒尺寸为3- 5 nm，但相应的BET表面积显著不同，Ptp/C和Pts/C分别为131.6m2g− 1和87.7m2g− 1，表明Ptp/C中铂颗粒的多孔结构。甲醇氧化的峰电流分别为167 mAmg − 1和44 mAmg− 1，表明Ptp/C对甲醇氧化具有高电催化活性。CA结果表明，Ptp/C作为甲醇氧化的电催化剂具有良好的稳定性。
In this paper, we reported a novel electrocatalyst, Vulcan XC-72-supported porous platinum nano-particles (Ptp/C) for methanol oxidation. In the preparation of Ptp/C, platinum precursor was first adsorbed on carbon and then reduced by l-ascorbic acid in ethylene glycol solution. The structure and morphology of Ptp/C and its activity toward methanol oxidation were characterized by transmission electron microscopy (TEM), Brunauer–Emmett–Teller (BET) measurement, X-ray diffraction (XRD), energy-dispersion spectrometer (EDS), cyclic voltammetry (CV), and chronoamperometry (CA), with a comparison of the electrocatalyst prepared with sodium borohydride as reducer (Pts/C). It is found that both electrocatalysts have similar particle size but have different surface morphology of platinum and thus exhibit different electrocatalytic activity toward methanol oxidation. The platinum particle size of both electrocatalysts is 3–5nm, but the corresponding BET surface areas are different significantly, 131.6m2g−1and 87.7m2g−1for Ptp/C and Pts/C, respectively, indicative of the porous structure of platinum particles in Ptp/C. The peak current for methanol oxidation on CV is 167mAmg−1and 44 mAmg−1for Ptp/C and Pts/C, respectively, indicative of the high electrocataytic activity of Ptp/C toward methanol oxidation. The result from CA shows that Ptp/C has good stability as the electrocatalyst for methanol oxidation.