Silver Nanoparticle/Multiwalled Carbon Nanotube Hybrid as an Efficient Electrocatalyst for the Oxygen Reduction Reaction in Alkaline Medium
writer：Lulu Guo, Li Xiang, Fujie Li, Xiaoteng Liu, Lei Xing, Degui Li, Zhihong Luo, Kun Luo
keywords：silver nanoparticle, carbon nanotube, hybrid, electrocatalyst, oxygen reduction reaction
source：期刊
Issue time：2019年
A straightforward approach is employed to synthesize silver nanoparticle/multiwalled carbon nanotube (Ag/MWNTs) hybrids through the direct reduction of silver nitrate in the presence of MWNTs, where Ag nanoparticles capped with tris(hydroxymethyl)phosphine oxide (d=2.9 nm) are uniformly deposited on MWNTs. The as-synthesized Ag/MWNTs hybrids exhibit high catalytic activity toward the oxygen reduction, which increases with the loading amount of Ag nanoparticles. Rotating disk electrode and rotating ring-disk electrode analyses further indicate that the Ag/MWNTs hybrids follow the same four electron pathway towards the oxygen reduction reaction as the Pt/C catalyst, and the Ag/MWNTs hybrid (22.8 wt.%) manifests
comparable catalytic activity to the 20% Pt/C catalyst, together with superior long-term stability and methanol tolerance, demonstrating the potential application on direct methanol
fuel cells as an effective oxygen reduction catalyst.