of cerium oxide suspended nanoparticles doped with gadolinium oxide under the ultrasound for Co/CeO2 and Ni/CeO2 composite fuel cells. EQCM can also be used to study the energy storage performance and influencing factors of supercapacitors and electrochemical capacitors. For example, EQCM is used to study the ion movement gauge of conductive polymer of capacitor on cathode. Some work studied the EQCM application in solar energy, which is mostly additive and thin film material related, for instance, using EQCM to study the electrochemical deposition process and stability of Co-Pi oxygen evolution catalyst for solar storage. References Electrochemistry Weighing instruments