Cobalt And Nickel-based Catalysts For Electrocatalytic Oxidation Of Organic Substrates

Activation of molecular oxygen for controlled oxidation is an ideal and useful target for electrochemical processes,and the oxidation of organic compounds under mild conditions could make many industrial processes more sustainable.The water molecule is composed of one oxygen atom and two hydrogen atoms,and water is abundant on earth and is the most suitable source of oxygen.Therefore,the direct or indirect activation of the substrate at the anode to generate the corresponding desired product by electrochemically using oxygen in water as the oxygen source,and the concomitant reduction of protons at the cathode leading to the formation of hydrogen gas becomes a challenging but Environmentally friendly methods for constructing various functional molecules.Epoxy compounds provide a variety of important building blocks for the chemical industry as well as for fine chemicals and pharmaceuticals.For chemical processes,carrying out epoxidation reactions often requires harsh reaction conditions or the use of synthetic oxidants,under which oxidation-sensitive oxidants cannot be tolerated.functional groups,and the high cost and high energy consumption are not economical.In this paper,CoTPP-COFs/CNT electrocatalysts were synthesized and prepared,in the environment of acetonitrile and water,using water as the oxygen source,the anode electrocatalyzed the oxidation of cyclooctene and the cathode hydrogen evolution.The effect of the applied voltage on the Faradaic efficiency of the epoxidized product was explored.When the applied voltage was 1.8 V vs.RHE,when the concentrations of water and cyclooctene were 12 M and 200 m M,respectively,the anode products was detected by the GC-2014 gas chromatograph.One of the products is epoxycyclooctane with the highest Faradaic efficiency of 14.7%.5-Hydroxymethylfurfural（HMF）,as an important dehydration product from cellulosic biomass,has great potential as a platform substrate for the production of value-added feedstocks,and 2,5-furandicarboxylic acid（FDCA）can be processed by HMF Oxidative direct synthesis,FDCA can replace terephthalic acid to produce important fine chemicals,and has very important industrial value.In this paper,a bimetallic electrocatalyst（Co-doped-（Ni-MOFs））integrated with Co-doped Ni MOFs was also synthesized by hydrothermal method and electrodeposition method for the oxidation of HMF in 0.1 M KOH solution.The experimental results demonstrate that the catalytic activity of the bimetallic（Co Ni）-based catalysts is higher than that of any single-metallic（Co/Ni）-based catalysts.Co-doped-（Ni-MOFs）electrocatalytic oxidation of 5 m M HMF in 0.1 M KOH solution,electrolysis at 1.60 V vs.RHE applied potential for 4 h,the HMF conversion rate reached 99.3%,and the oxidation product FDCA yield reached 99.01%,the selectivity is as high as 99.7%,and the formation rate of FDCA is 37.13μmol cm^-2 h^-1,and its catalytic performance exceeds most of the electrocatalysts used in the reported literature.