(2021) Ajou-Kyoto-Zhejiang Joint Symposium on Energy Science was held on Nov. 29th 2021 online. There are 67 participants from Ajou university (Korea), Kyoto University (Japan) and Zhejiang University (China) attended this symposium. There are 6 general oral presentations and 8 young-scientist oral presentations from students and professors in Kyoto University, making it a meaningful opportunity for research exchange.