Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 298, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2021.120587
Keywords
Layered double hydroxide; Charge transfer channel; Synergistic effect; Bifunctional electrocatalyst; Overall water splitting
Funding
- National NaturalScience Foundation of China [51972024]
- Fundamental Research Funds for the Central Universities [FRF-TP-20-005A3]
- Interdisci-plinary Research Project for Young Teachers of USTB (Fundamental Research Funds for the Central Universities) [FRF-IDRY-19-020]
- Scientific and Technological Innovation Foundation of Shunde Graduate School, University of Science and Technology Beijing [BK19AE029]
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By systematically tuning the molar ratios of M2+:M3+ and Fe3+:V3+ in tri-metallic LDHs, a self-supported electrocatalyst named Co8FeV@CC with optimal OER and HER performance has been successfully constructed. This unique catalyst demonstrates high catalytic activity and stability, showing low overpotentials and nearly 100% Faraday efficiency for both OER and HER.
A series of self-supported electrocatalysts composed of tri-metallic CoFeV-LDHs generated on conductive carbon cloth (denoted as CoFeV@CC) have been constructed. The specific interaction among Co, Fe and V is systematically revealed via tuning the molar ratios of M2+:M3+ and Fe3+:V3+ in these tri-metallic LDHs. Finally, the optimal synergistic effect is reached when the molar ratios of M2+:M3+ and Fe3+:V3+ are respectively 4:1 and 1:1, resulting in the product named Co8FeV@CC, which displays the best overall OER and HER performance. Only rather low overpotentials of 235 and 182 mV are required to attain the current density of 100 mA cm-2 with a Faradaic efficiency of nearly 100 % for OER and HER, respectively. Co8FeV@CC can thus be applied as both an anode and cathode in the symmetrical two-electrode and possesses a current density of 100 mA cm-2 at the cell voltage of 1.65 V, and further demonstrates ultra-high stability for 100 h.
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