High-performance spinel NiMn2O4 supported carbon felt for effective electrochemical conversion of ethylene glycol and hydrogen evolution applications

Abstract

One of the most effective electrocatalysts for electrochemical oxidation reactions is NiMn2O4 spinel oxide. Here, a 3-D porous substrate with good conductivity called carbon felt (CF) is utilized. The composite of NiMn2O4-supported carbon felt was prepared using the facile hydrothermal method. The prepared electrode was characterized by various surface and bulk analyses like powder X-ray diffraction, X-ray photon spectroscopy (XPS), Scanning and transmitted electron microscopy, thermal analysis (DTA), energy dispersive X-ray (EDX), and Brunauer–Emmett–Teller (BET). The activity of NiMn2O4 toward the electrochemical conversion of ethylene glycol at a wide range of concentrations was investigated. The electrode showed a current density of 24 mA cm−2 at a potential of 0.5 V (vs. Ag/AgCl). Furthermore, the ability of the electrode toward hydrogen evaluation in an alkaline medium was performed. Thus, the electrode achieved a current density equal 10 mA cm−2 at an overpotential of 210 mV (vs. RHE), and the provided Tafel slope was 98 mV dec−1.

Facile Hydrothermal Synthesis of NiMn2O4/C Nanosheets for Solid-State Asymmetric Supercapacitor and Electrocatalytic Oxygen Evolution Reaction

“…The LSV measurements were conducted at a potential scan rate of 5 mV s –1 versus SCE in a 2 M KOH. The recorded potential values were converted from the SCE to the RHE scale utilizing the Nernst eq : E RHE = E SCE + 0.059 · pH + E SCE 0 where the standard redox potential of SCE at 298 K is 0.244 V. This potential was subsequently converted to the potential versus the RHE. The electrocatalytic efficiency, expressed as the overpotential (η), was derived from the LSV curve at a specified current density ( j , mA cm –2 ) using the following eq η = E RHE false( V false) − 1.23 false( V false) The Tafel slope was determined by applying eq to a linear fit of the Tafel plot …”

Modified NiFe2O4-Supported Graphene Oxide for Effective Urea Electrochemical Oxidation and Water Splitting Applications

“…Utilizing renewable energy sources like solar and water energy for electrochemical water splitting is a sustainable method to generate green hydrogen. Commercial Pt/C is the most effective catalyst for the hydrogen evolution process (HER) (2H+ + 2e−→H2) [ 16 , 17 ]. However, its high cost and limited availability have hindered its widespread use in industrial production.…”