Theoretical and experimental study of flower-like NiMoS/NiO/NF with interface layer as a novel highly efficient bifunctional-electrode toward supercapacitor and HER

• Published in: Journal of electroanalytical chemistry (Lausanne, Switzerland) Switzerland), 2024-05, Vol.960, p.118163, Article 118163
• Main Authors: Germán-Santiana Espín, Cristian, Marcelo Bravo Morocho, Wilian, Ángel Sánchez Cordero, Andrés, Chandra, Subhash, Bansal, Pooja, Kaur, Harpreet, Ahmed Mustafa, Mohammed, Islam, Saiful, Lasisi, Ayodele
• Format: Article
• Language: English
• Subjects: Flower-like; Hydrogen Evolution Reaction; Hydrothermal; Nanosheets; NiMoS/NiO/NF; Supercapacitor
• ISSN: 1572-6657
• DOI: 10.1016/j.jelechem.2024.118163

[Display omitted] •Two-step methods were used to design the structure of NiMoS/NiO/NF 3D- flower-like amorphous composite.•The NiMoS/NiO/NF electrode has good stability for the supercapacitor and HER.•The current density of 10 mA cm−2 is achieved at a small overpotential of 43 mV. Electrocatalytic water splitting and supercapacitor systems are considered one of the most imperative sustainable energy storage and conversion technologies as an alternative clean energy carrier/source to fossil fuels in order to address the pressing global warming problems. For achieving sustainable electrochemistry devices, highly efficient and superior durability electrocatalysts must be prepared through a facile and controllable approach. This study successfully demonstrated the development of a binder-free 3D- flower-like amorphous structure composite with self-assembled nanosheets supported on Nickel foam (NiMoS/NiO/NF) by a simple two-step hydrothermal technique as advanced electrocatalysts for alkaline hydrogen evolution reaction (HER) and supercapacitor. The as-obtained NiMoS/NiO/NF only needs a overpotential of 43 mV vs. RHE to reach 10 mA.cm−2 and remained stable after long-term HER tests. In the following, the nanostructure was operated as an electrode in the supercapacitor. According to the Galvanostatic Charge-Discharge (GCD) teats, the specific capacitance of NiMoS/NiO/NF was measured as 999F/g. Such outstanding NiMoS/NiO/NF performance can be ascribed to the synthesis of the interface layer (NiO), which makes the robust adhesion between NF and the final layer (NiMoS). The amorphous morphology with multi-component doping and heterojunctions, optimizes the hydrogen desorption sites, which leads to significant HER catalytic activity. The present experimental results and density functional theory (DFT) study offer a cost-effective, and convenient pathway to produce highly efficient non-nobel-based metal as high-valued multifunctional materials.