Hydrogen has been increasingly considered as the fuel of the future and a potential alternative to fossil fuels because it is the cleanest and ideal energy carrier. Water electrolysis is one of the easiest methods for hydrogen production, offering the advantage of simplicity. Rhodium is considered as one of the best electrocatalysts for water electrolysis. This research was conducted to investigate the stability of rhodium electrode for its potential electrocatalytic application as an anode and a cathode in water electrolysis. The Rh electrode was fabricated from a 5g/L solution of Rh_2(SO_4)_3 electroplated at 3.00V for 3mins in a 92.5% Ag alloy substrate. On a 48-hour continuous water electrolysis in sulfuric acid and sodium hydroxide solutions, Rh electrode showed excellent stability as an anode on both acidic and basic media. However, it may fail as a cathode in long term water electrolysis. Stability as a cathode decreases with increasing electrolyte concentration at a higher rate on acidic medium.
展开▼
