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Silver Nanoparticle/Multiwalled Carbon Nanotube Hybrid as an Efficient Electrocatalyst for the Oxygen Reduction Reaction in Alkaline Medium
Author(s) -
Guo Lulu,
Xiang Li,
Li Fujie,
Liu Xiaoteng,
Xing Lei,
Li Degui,
Luo Zhihong,
Luo Kun
Publication year - 2019
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201900232
Subject(s) - electrocatalyst , catalysis , methanol , carbon nanotube , materials science , nanoparticle , rotating ring disk electrode , nanotube , oxygen , chemical engineering , oxide , reducing agent , hydroxymethyl , inorganic chemistry , electrode , chemistry , nanotechnology , electrochemistry , organic chemistry , engineering , metallurgy
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.