Pan Dawei, Chen Jinhua, Tao Wenyan, Nie Lihua, Yao Shouzhuo
State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and ChemicalEngineering, Hunan University, Changsha 410082, People's Republic of China.
Langmuir. 2006 Jun 20;22(13):5872-6. doi: 10.1021/la053171w.
A new catalyst support, polyoxometalate-modified carbon nanotubes, is presented in this paper through the chemisorption between polyoxometalate and carbon. Pt and Pt-Ru nanoparticles were electrochemically deposited on polyoxometalate-modified carbon nanotubes electrodes, and their electrocatalytic properties for methanol electro-oxidation are investigated in detail. Due to the unique electrical properties of carbon nanotubes and the excellent redox properties and the high protonic conductivity of polyoxometalate, for the similar deposition charge of Pt and Pt-Ru catalysts, 1.4 times larger exchange current density, 1.5 times higher specific activity, and better cycle stabilities can be obtained at polyoxometalate-modified carbon nanotube electrodes as compared to the electrodes without polyoxometalate modification. These results show that polyoxometalate-modified carbon nanotubes as a new catalyst support have good potential application in direct methanol fuel cells.
本文通过多金属氧酸盐与碳之间的化学吸附作用，提出了一种新型催化剂载体——多金属氧酸盐修饰的碳纳米管。将Pt和Pt-Ru纳米颗粒电化学沉积在多金属氧酸盐修饰的碳纳米管电极上，并详细研究了它们对甲醇电氧化的电催化性能。由于碳纳米管独特的电学性质、多金属氧酸盐优异的氧化还原性质和高质子传导率，对于Pt和Pt-Ru催化剂相似的沉积电荷量，与未修饰多金属氧酸盐的电极相比，在多金属氧酸盐修饰的碳纳米管电极上可获得大1.4倍的交换电流密度、高1.5倍的比活性以及更好的循环稳定性。这些结果表明，多金属氧酸盐修饰的碳纳米管作为一种新型催化剂载体在直接甲醇燃料电池中具有良好的潜在应用前景。
