Tang Hao, Chen Jinhua, Nie Lihua, Liu Dengyou, Deng Wei, Kuang Yafei, Yao Shouzhuo
College of Chemistry and Chemical Engineering, State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, Changsha 410082, People's Republic of China.
J Colloid Interface Sci. 2004 Jan 1;269(1):26-31. doi: 10.1016/s0021-9797(03)00608-8.
Highly dispersed platinum nanoparticles were electrodeposited on graphitic carbon nanofibers (GCNFs) by cyclic voltammetry (CV) in 7.7 mM H2PtCl6+0.5 M HCl aqueous solutions. The graphitic carbon nanofibers (GCNFs) used in this paper were grown directly on a graphite disk by chemical vapor deposition (CVD). The micrographs and element composition of Pt/GCNFs/graphite electrode were characterized by scanning electron microscopy (SEM) and electron diffraction spectroscopy (EDS). The electrocatalytic properties of Pt/GCNFs/graphite electrode for methanol oxidation have been investigated by CV and excellent electrocatalytic activity can be observed even at very low platinum loading (md=8.79 microg cm(-2)). The highest mass activity (MA) for methanol oxidation reaches 323 Ag(-1) when Pt/GCNFs/graphite electrode was cycled at a sweep rate of 50 mVs(-1) by CV in 2 M CH3OH+1 M H2SO4 aqueous solutions. This may be attributed to the small particle size and high dispersion of platinum particles coated on GCNFs and shows good potential application in direct methanol fuel cell (DMFC). Additionally, the long-term cycling stability of platinum catalysts was also investigated.
通过循环伏安法（CV）在7.7 mM H2PtCl6 + 0.5 M HCl水溶液中，将高度分散的铂纳米颗粒电沉积在石墨碳纳米纤维（GCNF）上。本文中使用的石墨碳纳米纤维（GCNF）通过化学气相沉积（CVD）直接生长在石墨盘上。通过扫描电子显微镜（SEM）和电子衍射光谱（EDS）对Pt/GCNF/石墨电极的显微照片和元素组成进行了表征。通过CV研究了Pt/GCNF/石墨电极对甲醇氧化的电催化性能，即使在非常低的铂负载量（md = 8.79 μg cm(-2)）下也能观察到优异的电催化活性。当Pt/GCNF/石墨电极在2 M CH3OH + 1 M H2SO4水溶液中以50 mV s(-1)的扫描速率通过CV循环时，甲醇氧化的最高质量活性（MA）达到323 A g(-1)。这可能归因于涂覆在GCNF上的铂颗粒的小粒径和高分散性，并在直接甲醇燃料电池（DMFC）中显示出良好的潜在应用。此外，还研究了铂催化剂的长期循环稳定性。
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