Factorial Optimization of CoCuFe-LDH/Graphene Ternary Composites as Electrocatalysts for Water Splitting
Daniele Alves, Rafael de Andrade Moral, Darshana Jayakumari, Eithne Dempsey, Carmel B. Breslin
Abstract
High Resolution Image Download MS PowerPoint Slide The layered double hydroxides (LDHs) have demonstrated significant potential as non-noble-metal electrocatalysts for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). Their unique compositional and structural properties contribute to their efficiency and stability as catalysts. In this study, CoCuFe-LDH composites were grown on graphene (G) via a cost-effective and straightforward one-step hydrothermal process. A 2-level full-factorial model was employed to determine the impact of Co (1.5, 3, and 4.5 mmol) and graphene (10, 30, and 50 mg) concentrations on the onset potential of OER and HER, which were the chosen response variables. OER and HER activity variabilities were assessed in triplicate using Co [3] Cu [3] Fe [3] -LDH/G [30] (central point), which were determined at 0.01% and 0.02%, respectively. Statistical analyses demonstrated that Co [4.5] Cu [3] Fe [3] -LDH/G [10] and Co [1.5] Cu [3] Fe [3] -LDH/G [10] showed the lowest onset potential at 1.52 V and −0.32 V (V vs RHE) for the OER and HER, respectively, suggesting that a high cobalt concentration enhances OER performance, while optimal HER catalysis was achieved with lower cobalt concentrations. Moreover, the trimetallic composites exhibited good stability with negligible loss of catalytic activity over 24 h.