Electrochemically dealloyed nanoporous Fe<sub>40</sub>Ni<sub>20</sub>Co<sub>20</sub>P<sub>15</sub>C<sub>5</sub> metallic glass for efficient and stable electrocatalytic hydrogen and oxygen generation
K. S. Aneeshkumar, Jochi Tseng, Xiaodi Liu, Jinsen Tian, Dongfeng Diao, Jun Shen
Abstract
, the metallic glass ribbons, after electrochemical dealloying, needed an overpotential of 128 mV for hydrogen evolution reaction, while in 1 M KOH they needed an overpotential of 236 mV for hydrogen evolution. For the oxygen evolution reaction, the overpotential was 278 mV. The electrochemical dealloying procedure significantly reduced the overpotential, and the overpotential remained constant over 20 hours of test conditions under acidic and alkaline conditions. The improved electrocatalytic activity was explained based on the metastable nature of metallic glass and the synergistic effect of metal hydroxo species and phosphates. Based on the excellent properties and free-standing nature of these metallic glass ribbons in electrolyte medium, we propose the current metallic glass for commercial, industrial electrocatalytic applications.