Silver Nanoparticle/Multiwalled Carbon Nanotube Hybrid as an Efficient Electrocatalyst for Oxygen Reduction Reaction in Alkaline Medium

Guo, LuLu, Xiang, Li, Li, Fujie, Liu, Terence (Xiaoteng), Xing, Lei, Li, Degui, Luo, Zhihong and Luo, Kun (2019) Silver Nanoparticle/Multiwalled Carbon Nanotube Hybrid as an Efficient Electrocatalyst for Oxygen Reduction Reaction in Alkaline Medium. ChemElectroChem, 6 (9). pp. 2489-2496. ISSN 2196-0216

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Abstract

A facile approach is employed to synthesize Ag/MWNTs hybrids by the direct reduction of silver nitrate with presence of MWNTs, where Ag nanoparticles capped with tris(hydroxymethyl)phosphine oxide (d = 2.9 nm) are uniformly deposited on multi‐walled carbon nanotubes. The as‐synthesized Ag/MWNTs hybrids exhibit high catalytic activity toward oxygen reduction, which increases with the loading amounts of Ag nanoparticles. RDE and RRDE analyses further indicate that the Ag/MWNTs hybrids follow the same four‐electron pathway towards 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.

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