With the rapid development of wind and solar power generations, electricity from clean and renewable sources are getting more accessible. One of the future challenges will be developing green and efficient energy storage. And a possible solution is to use electrochemical conversion to store energies in the bond of molecules. Selective transformation of small molecules, such as nitrogen, carbon dioxide, methane and water, into chemical feedstocks and fuels are attracting global attention. Most of these reactions are inner-sphere electron transfer process where the solid-liquid interface plays a crucial role. Our group focuses on the investigation and understanding of chemical reactions occurring at the electrode-solution interface, therefore, to design more efficient systems for energy storage.