Abstract
Alkaline water electrolysis is hindered by the slow kinetics of the hydrogen evolution reaction (HER) in alkaline media. We report enhanced HER activity of Pt on a mixed-metal-oxide support composed of titanium dioxide (TiO2) and ruthenium dioxide (RuO2). The Pt/RuO2-TiO2 (Pt/RTO) electrocatalyst was characterized by XRD, TEM and BET. The particle size of Pt was 6 ± 0.63 nm and the support surface area was 33 ± 1.15 m2/g. The activity of Pt/RTO toward HER and the hydrogen oxidation reaction (HOR) in 0.1 M KOH was compared against a benchmark Pt/C catalyst (46.5%Pt; Tanaka, K. K.) using the rotating disk electrode (RDE) technique. Pt/RTO outperformed the benchmark Pt/C over the range of temperatures studied (275–313 K). The exchange current density for Pt/RTO was 2.31 ± 0.06 mA/cm2Pt (at 295 K, 1600 rpm, in H2-saturated 0.1 M KOH), which was more than five times the measured exchange current density of the Pt/C benchmark under the same conditions. Pt/RTO and Pt/C were further evaluated in a solid-state alkaline water electrolyzer operated with ultrapure water. MEAs fabricated with Pt/RTO as the cathode and IrO2 as anode catalyst showed a 100–200 mV reduction in the cell voltage across the entire current density range, when compared to MEAs fabricated with Pt/C at the cathode and IrO2 at the anode.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
