Electrocatalytic study of NiO-MOF with activated carbon composites for methanol oxidation reaction

Abstract

In this work, the methanol oxidation reaction is investigated on Ni based metal organic frameworks (MOF) and its composites with biomass derived activated carbon. NiO-MOF and composites with activated carbon were synthesized using hydrothermal method. SEM, EDX, and XRD, FTIR, TGA techniques were used for characterization of composites. The electrochemical activity of catalysts for oxidation of methanol was tested using cyclic voltammetry (CV) in 1 M KOH and 3 M CH3OH on glassy carbon electrode in three electrode setup. The electrochemical performance shows the effect of activated carbon concentration on methanol oxidation. The electro-oxidation catalyzed by NiO-MOF with activated carbon (40 mg) composite exhibits a peak current density of 182.72 mA/cm2 at 0.89 V potential with a scan rate of 50 mV/s making it a potential catalyst for electrocatalysis of methanol.

Tubular Nickel Hydroxide Embedded in Zeolitic Cobalt Oxide for Methanol Oxidation Reaction

“…The CV analysis plots are represented in Figure a–e. The CV analysis provided clear evidence for the ability of both materials to participate in electrochemical oxidation of methanol with onset potential of 1.29 V and peak current density of 1.50 Amg –1 with Ni­(OH) 2 -Co 3 O 4 (Figure a, green), while the same in the case of Ni­(OH) 2 -Co 3 O 4 -MWCNT catalysts (Figure a, black) was observed with onset potential of 1.4 V, giving a peak current density of 4.2 Amg –1 . − The sharp rise in current density on modification with MWCNTs clearly indicated the influence of the carbon matrix on the overall MOR activity of the catalyst. The addition of MWCNTs that are known for their high electronic conductivity may account for the high current density generated by the material, Ni­(OH) 2 -Co 3 O 4 -MWCNT.…”

An Efficient and Stable Electrocatalyst Derived from Ni−Mo−Co MOF for Methanol Oxidation Reaction

“…This shows that loading catalytic MOFs made of a single metal onto porous, conductive substrates is also a good way to get around the problems of low electrical conductivity and low mass permeability. Metals in different oxidation states provide a number of active sites during the methanol oxidation reaction process [43] …”

“…Metals in different oxidation states provide a number of active sites during the methanol oxidation reaction process. [43] Further, the backward scan of Ni-MOF/NF and Mo-MOF/NF is also recorded at 200 mVs À 1 in alkaline 3 M methanol and was also applied to calculate charge integration and disclose the actual amount of electrochemically available charge sites for the methanol oxidation reaction (Figure 6b, 6d). Figure 6 13 .…”

Fabrication of MoS2/rGO hybrids as electrocatalyst for water splitting applications

“…This is attributable to the vacant d-orbital of transition metals and their hybrids, which plays an essential part in forming a moderate hydrogen bond and is highly signicant for hydrogen generation. 27,28 In this particular instance, there has been an emphasis placed on the use of transition metal compounds, particularly transition metal suldes that have been found to possess high activity for HER and OER because of their unique electrical characteristics, high valence, transition metal ion synergy, and great corrosion resistance in an alkaline environment. [29][30][31] Molybdenum disul-de (MoS 2 ) is a robust substance having a distinctive twodimensional layered architecture similar to graphene.…”