Abstract
Metal-free (i.e., residual metallic impurities-blocked) carbon nanotubes (CNTs) do show electrocatalytic activity for H2 evolution, O2 evolution and O2 reduction reactions (HER, OER & ORR) in alkaline solutions, but their activities strongly depend on the number of walls or inner tubes with a maximum for CNTs with 2-3 walls.
Highlights
Metal-free carbon nanotubes (CNTs) do show electrocatalytic activity for H2 evolution, O2 evolution and O2 reduction reactions (HER, OER & ORR) in alkaline solutions, but their activities strongly depend on the number of walls or inner tubes with a maximum for CNTs with 2–3 walls
Wang and Pumera studied the ORR on three different MWNTs with different levels of metal impurities and the results show that Ni, Co and Fe oxides are not active for ORR and the only active metal impurity for ORR in KOH solution is MnO2
We recently studied the electrocatalytic activity of pristine CNTs and showed that CNTs composed of 2–7 concentric tubes or walls have significantly higher electrochemical activities for the OER in alkaline solutions as compared with typical SWNTs and MWNTs.[10]
Summary
Metal-free (i.e., residual metallic impurities-blocked) carbon nanotubes (CNTs) do show electrocatalytic activity for H2 evolution, O2 evolution and O2 reduction reactions (HER, OER & ORR) in alkaline solutions, but their activities strongly depend on the number of walls or inner tubes with a maximum for CNTs with 2–3 walls.
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