微结构对纳米碳纤维氧阴极还原性能影响

Microstructure Effect of Carbon Nanofibers on Oxygen Reduction Properties of Cathode

摘要:

在制备微结构可控纳米碳纤维基础上,研究纳米碳纤维微结构对氧气电催化还原反应(oxygen reduction reaction,ORR) 性能的影响.利用化学还原法合成了Pt电催化剂,研究了纳米碳纤维微结构对Pt/CNFs电催化剂电催化性能的影响.研究发现,相对于基于活性炭的电催化剂,载于纳米碳纤维的电催化剂具有较高的ORR活性;同时,基于板式纳米碳纤维的电催化剂表现出最高的ORR活性.

关键词:纳米碳纤维; 微结构; 电催化剂; 氧的阴极还原性能

Abstract:

Microstructures controllable carbon nanofibers (CNFs),i.e.platelet CNFs (pCNFs),fishbone CNFs (fCNFs) and tube CNFs (tCNFs),were synthesized and the microstructure effect on oxygen reduction reaction (ORR) performance was investigated.The physicochemical and electrochemical properties of the CNFs and Pt/CNFs were characterized by high resolution transmission electron microscope (HRTEM),Xray diffraction (XRD) and cyclic voltammetry.Platinum electrocatalysts supported on CNFs and activated carbons were synthesized,too.Pt/p-CNFs exhibits more positive ORR onset reduction potential than the electrocatalyst supported on other CNFs and activated carbon.

Key words:carbon nanofibers; microstructure; electrocatalyst; oxygen reduction reaction