The persistent utilization of fossil fuels has resulted
in a continuous
increase in atmospheric carbon dioxide levels. As a potential solution
to environmental concerns, the electrochemical reduction of carbon
dioxide to solid carbon is recognized for its straightforward operation,
precise reaction control, and environment friendliness. Moreover,
with this process combined with renewable energy sources, such as
solar or wind power, electrochemical reduction can further contribute
to reducing carbon emissions and promoting sustainable development.
However, the strong double covalent bond between carbon and oxygen
atoms and the degradation of the electrodes hinder the commercialization
of this technology. Several strategies have been reported, including
reduction of carbon dioxide in solid oxide electrolysis cells, in
molten salt and liquid metal, and using a hybrid electro-thermochemical
looping strategy. This mini-review presents a systematic and critical
analysis of the experimental conditions, mechanisms, and product morphologies
reported in the literature, thereby offering reference for future
research endeavors in this rapidly emerging field.