Study On Electrocatalytic Performance Of Mn_xCo_3-xO₄ Nanoarrays Towards Oxygen Evolution Reaction

Although new energy is not lacking,there are still many problems to achieve large output of it.It is promising to obtain hydrogen from water splitting,but the issue is the slow kinetic process of oxygen evolution(OER),which hinders the efficiency of the hydrogen production.Therefore,the development of efficient OER catalyst is an urgent requirement for human survival.There have been a large number of studies on OER catalysts,and most of them focused on metal-air batteries,fuel cells,etc.In addition,some dual-function catalyst with OER catalytic function also used in energy storage and capacity devices like lithium batteries,including cobalt manganese oxide materials studied for the field of Photocatalytic electrolysis of water.The state of the subject is also a wide range of powder,nanoparticles,nanocrystals,nano-porous structure,etc.,probably for the preparation of large surface area and new structure of materials to expose more active sites and found new reaction mechanism to better guide the experiment.Cobalt manganese oxide is very stable and has the basis of OER reaction.More importantly,the present research cannot meet the requirements of the ideal OER catalyst.Secondly,for the sake of economy,the cobalt manganese oxide was chosen as the main subject,and the nickel foam with superior conductivity was chosen as the substrate.A simple and mild hydrothermal synthesis method was adopted to prepare the nanoarrays with excellent catalytic properties.When the current density is 10 m A cm-2 at 25?,the potential of the electrolyzed water is 0.54 V with respect to the saturated calomel electrode(SCE),which is converted to the reversible hydrogen electrode(RHE)with the overpotential of 0.31 V;Work for 15 hours later,the current of Potentiostatic method retained 92.2% with great stability.The catalytic performance of Cobalt manganese oxide is better than the precious metals and their oxides in the same conditions,and also better than parts of the present non-precious metals.XPS,EDS and other data analysis shows that the product is manganese doped cobalt oxide,thus forming a new synthesis method of manganese-doped cobalt oxide nano-array for oxygen evolution reaction in alkaline electrolyte.This study promoted the progress of the water electrolysis to a certain extent,and filled the vacancies in the aspect that cobalt-manganese oxide nanoarrays acted as a catalyst for the OER of water electrolysis.