Origin of the electrocatalytic activity in carbon nanotube fiber counter-electrodes for solar-energy conversion.

ABSTRACT: Carbon nanotubes are a versatile platform to develop sustainable and stable electrodes for energy-related applications. However, their electrocatalytic activity is still poorly understood. This work deciphers the origin of the catalytic activity of counter-electrodes (CEs)/current collectors made of self-standing carbon nanotube fibers (CNTfs) using Co²⁺/Co³⁺ redox couple electrolytes. This is based on comprehensive electrochemical and spectroscopic characterization of fresh and used electrodes applied to symmetric electrochemical cells using platinum-based CEs as a reference. As the most relevant findings, two straight relationships were established: (i) the limiting current and stability increase rapidly with the surface concentration of oxygen-containing functional

SUBMITTER: Martinez-Muino A 

PROVIDER: S-EPMC9417869 | biostudies-literature | 2020 Oct

REPOSITORIES: biostudies-literature