Synergistically Interfaced Bifunctional Transition Metal Selenides for High‐Rate Hydrogen Production Via Urea Electrolysis

• Published in: ChemCatChem 2022-01, Vol.14 (1), p.n/a
• Main Authors: Desalegn, Bezawit Z., Hern, Kim, Gil Seo, Jeong
• Format: Article
• Language: English
• Subjects: Charge transfer; Electric potential; Electrolysis; Hydrogen evolution reaction; Hydrogen production; Oxygen evolution reaction; Power consumption; Selenides; Transition metals; Urea oxidation reaction; Ureas; Urine electrolysis; Voltage
• ISSN: 1867-3880; 1867-3899
• DOI: 10.1002/cctc.202100969

The realization of carbon‐neutral energy is regarded a prime challenge as the environment and energy have become two key issues facing modern society. Here, synergistically interfaced transition metal selenides are studied for hydrogen production via urea electrolysis with concurrent environmental treatment. Extremely low overpotentials of 210 mV, 250 mV, and 1.41 V vs. RHE were observed at 100 mA cm−2 for HER, OER and UOR, respectively with a 98.3 % faradaic efficiency. A notably low cell voltage of 1.6 and 1.84 V was required at 200 mA cm−2 for urea and water electrolysis, respectively along with a remarkably stable performance for 4 days. Additionally, A 1.45‐fold increase in H2 production rate was observed for urea electrolysis [26.6 μmol min−1] when compared with water electrolysis [18 μmol min−1] decreasing the power consumption by 37 %. Real human urine electrolysis was conducted with excellent performance requiring a cell voltage of only 1.9 V at 200 mA cm−2, attributed to the synergistic intermediate‐active site interaction, improved charge transfer capability, and slow surface transformation‐induced activation. Waste to Energy: Synergistic and multifunctional transition metal selenides with leaching induced activation for HER and slow surface reconstruction assisted active site generation for UOR exhibit enhanced urea assisted water electrolysis aiming towards waste‐water utilization and high rate carbon neutral H2 Production. A 37 % reduction in power consumption was achieved for urea electrolysis compared with water electrolysis.