Rational design of bimetallic metal-organic framework derived three-dimensional flower-like and porous NiCoFe LDH/NF electrocatalyst for electrochemical overall water splitting

• Published in: Journal of electroanalytical chemistry (Lausanne, Switzerland) Vol. 960; p. 118167
• Main Authors: Su, Chang, Wang, Dan, Wang, Wenchang, Mitsuzaki, Naotoshi, Shao, Rong, Xu, Qi, Chen, Zhidong
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.05.2024
• Subjects: 3D flower-like porous structure; Metal-organic framework; NiCoFe LDH/NF; Overall water splitting; 3D flower-like porous structure; NiCoFe LDH/NF; Metal-organic framework; Overall water splitting
• ISSN: 1572-6657; 1873-2569
• DOI: 10.1016/j.jelechem.2024.118167

We have report a high-performance self-supporting and cost-effective 3D flower-like and porous NiCoFe LDH/NF electrocatalyst for the HER and OER using an electrochemical deposition method subsequent an ion-exchange process. [Display omitted] •The NiCoFe LDH/NF catalyst has good transfer capability and abundance active sites.•MOF-derived LDHs benefit from evenly spaced cationic sheets with avoided aggregation.•3D flower-like NiCoFe LDH/NF have outstanding bifunctional electrocatalytic properties of OER and HER. Porous structured metal–organic frameworks (MOFs) and their derivatives are desired in catalysis and energy storage. Herein, three-dimensional (3D) flower-like NiCoFe LDH/NF are first synthesized though a convenient cathodic electrodeposition strategy subsequent an ion-exchange process. And the morphology and catalytic performance of the CoFe-MOF/NF can be finely by tailoring the electrodeposition voltage, deposition time and the ratio of Co: Fe. The 3D flower-like and porous NiCoFe/NF not only retains structural integrity to promote durability but also greatly alleviates the aggregation of active sites. In addition, the 3D flower-like and porous NiCoFe/NF display remarkable results with low overpotentials of 233 mV at a current density of 50 mA cm−2 for OER and 84 mV at a current density of 10 mA cm−2 for HER in 1 M KOH, respectively. When acting as electrocatalytic electrodes for overall water splitting, NiCoFe/NF displays a low overpotential of 1.52 V to achieve a current density of 10 mA cm−2. The study provides a promising approach to design MOF electrocatalysts for electrocatalytic applications.