FexNiyOOH/etched stainless steel mesh with different morphology for water electrolysis

Water electrolysis was recognized as an effective method for new energy sources. In this work, an effective Fe x Ni y OOH/ESS with high surface area and good catalytic activity was prepared for water electrolysis. Its morphologies at different ratio of Fe/Ni atoms were diverse, such as flower ball, flake, and block, etc. Test results showed that at 10 mA cm −2 and 300 mA cm −2 , the hydrogen evolution overpotentials of Fe 1.5 Ni 0.5 OOH/ESS were 172 mV and 258 mV. The oxygen evolution overpotentials of Fe 0.2 Ni 1.8 OOH/ESS were 208 mV and 308 mV at 10 mA cm −2 and 600 mA cm −2 . During the 136-h stability test, the oxygen evolution activity of Fe 0.2 Ni 1.8 OOH/ESS was basically unchanged. The Fe 1.5 Ni 0.5 OOH//Fe 0.2 Ni 1.8 OOH in alkaline conditions presented good performance for water electrolysis. Water electrolysis experiment was carried out at 1.58 V, and the current density reached to 10 mA cm −2 . Fe x Ni y OOH/ESS exhibited higher electrocatalytic activity and superior stability at high current density.