In 2019, many exciting breakthroughs were achieved in the clean energy field. The progress made on small molecule catalytic transformation has contributed to the integrated development of clean energy and the continuous development of zeroemission energy system. Breakthroughs have been achieved in stability and efficiency of solar cells and fuel cell technologies. Besides, big data and machine learning have been introduced into the field of lithium batteries to promote further development of new energy vehicles. Lithium batteries and biomass energies are also reviewed in this paper.

clean energy  /  catalytic small molecules conversion  /  solar cell  /  fuel cell  /  lithium battery  /  biomass energy