In 2020, a series of valuable research results were achieved in clean energy technology. Electrochemical conversion of small molecules, such as CO₂, accelerated the realization of ‘carbon neutrality’. The conversion efficiency of solar cells exceeded 29.15% in 2020. The alkaline membrane fuel cells' power density exceeded 2.58 W cm^-2, making the low-cost fuel cell closer to commercialization. Biomass energies are also prospected in this article.

clean energy  /  electrochemical conversion  /  fuel cell  /  storage battery  /  biomass energy