Shaohua Shen, PhD, is Professor at the International Research Center for Renewable Energy and Vice Director of the State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, China. He has worked for decades as a researcher in photocatalysis and electrocatalysis in both the US and China, and has published very widely on photo(electro)catalysis and related subjects. Shuangyin Wang, PhD, is Professor at the Key Laboratory for Graphene Materials and Devices and the College of Chemistry and Chemical Engineering, Hunan University, China. He has considerable research experience in Singapore, the US, the UK and China, and has published extensively on electrocatalysis and related subjects.