▎ 摘　　要

NOVELTY - An electrode comprises a substrate, and a coating applied to a surface of the substrate. The coating contains conductive carbon material, semi-conductive polymer and an oxygen evolution reaction (OER) catalyst. USE - Electrode for aqueous redox-flow battery for generating hydrogen (all claimed). ADVANTAGE - The electrode has high energy density and better lifetime of the energy storage itself, and is suitable for dual use as well as a respective redox flow battery, and can be used for energy storage during daily and seasonal fluctuations in energy production. The electrode is capable of storing energy in the form of a chemical potential in liquid electrolyte solutions, which are pumped through electrochemical cells, which is a resource in the multi-million-ton scale is needed to meet the worldwide need of energy storage systems, which exceeds the multi ternary capacity, and the electrode can be cycled as quickly as possible for optimal battery lifetime, thus improving the cycle life of the battery. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) aqueous redox-flow battery; (2) method for operating an aqueous redox-flow battery, which involves providing an aqueous redox-flow battery, operating the redox-flow battery in a charging/discharging mode, overcharging the redox-flow battery by generating hydrogen gas, terminating overcharging of the redox-flow battery and discharging the redox-flow battery, and operating the redox-flow battery in a charging/discharging mode; and (3) method for generating hydrogen with an aqueous redox-flow battery, which involves providing an aqueous redox-flow battery, fully charging the redox-flow battery, continuing charging of the redox-flow battery after the battery is fully charged by generating hydrogen gas, discharging the redox-flow battery, and optionally, operating the redox-flow battery in the charging/discharging mode.