Abstract：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.
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2021, Vol. 39 
