Preparation Of Underwater Superaerophilic/Superaerophobic Material And Their Application In Electrochemistry

In recent years,many studies have shown that the superwettable electrodes have an excellent positive effect on the electrochemical reaction with three-phase contact,making the electron transfer efficiency of the reaction increases dramatically,which provides a new exploration way for the development of electrochemistry.For example,hydrophobic electrodes exhibit high performance in the oxygen reduction reaction,which is attributed to the continuous capture of sufficient oxygen in the liquid/gas/solid three-phase interface.Superhydrophilic electrode shows a good promotion effect in the hydrogen evolution reaction.The electrode can prompt the bubbles to leave the reaction site quickly,and the three-phase contact surface will not form a large bubble accumulation.So far,the superwettable electrodes have been successfully applied in different research fields.However,thesuperwettable electrodes have been reported to be difficult to produce and be applied in practice due to its high price.Therefore,simple and low-cost methods to construct the three-phase interface of electrode are in extreme demand.In this paper,low-cost carbon black and foamed nickel are selected as the main raw materials,and with the help of silane-based low surface energy modifiers,a functional wetting material that can be used for electrochemical reactions is successfully prepared.The main research contents of this paper are as follows:An electrocatalyst for oxygen reduction reaction is synthesized by loading ZIF-67 on carbon black,then the hydrophobicity is bestowed on the catalyst and controlled by adjusting the amount of 1H,1H,2H,2H-perfluorodecyltriethoxysilane,aimed to preparing the carbon-based electrocatalyst with hydrophobic surface.Continuous and abundant cavitations on the catalyst surface ensure the rapid diffusion of oxygen to the three phase contact area of the reaction system.Compared with the unmodified catalyst,the hydrophobic catalyst has larger diffusion-limited current density(from 4.4 m A/cm²of the original catalyst to 5.2m A/cm² of the modified catalyst)and higher half-wave potential(from 0.81 V of the original catalyst to 0.83 V of the modified catalyst).Furthermore,the as-prepared electrocatalysts which obtained with low cost and simple method,presenting durability and stability against alkaline and acidic electrolyte solutions and providing a general and reliable strategy for the study of oxygen reduction reaction catalyst.To further expanding the practical application of superwetting interface in electrochemistry,we continue to study the promotion of superwetting interface on gas evolution electrochemical reaction.We use foam nickel as the base material,and use the hydrothermal method to sequentially load Co Ni₂S₄ and Mo S₂catalysts on the foam nickel to successfully prepare a green,environmentally friendly,strong stability,low cost,and high hydrogen production efficiency underwater superaerophobic electrode.This kind of electrode still maintains good wettability in strong acid-base electrolyte solution,and its hydrogen evolution performance hardly changes for 100 cycles test.In addition,the raw materials of the electrode are cheap and easy to obtain,which provides the possibility for the practical application of superwetting interface in gas evolution electrochemical reactions.