Study On Transition Metal Hydroxide In The Field Of Electrolytic Water

With the rapid development of today's society,the energy and environment crisis has become increasingly serious,so it is urgent to vigorously develop new energy technologies to solve these problems.Among them,electrolytic water technology technology attracted a lot of researchers'attention because of their huge potential and unique environmental advantages.Since the research,all kinds of materials have been proved unable to achieve good application in this field,but the recent research on NiFe-based two-dimensional transition metal compounds has achieved good results,and is expected to be applied in practical production.There are many preparation methods:such as hydrothermal method,electrodeposition method,CVD method,etc.However,the morphology,thickness and electronic properties of nanosheets by each method are different,so their electrochemical properties are often different,and may have some disadvantages.Therefore,it is a very effective strategy to improve the overall electrochemical properties by controlling and designing their structure,or by compounding other materials.In general,they only have good oxygen evolution performance,but the hydrogen evolution performance is extremely lacking.In addition,their catalytic performance is greatly limited by their poor conductivity,so it is difficult to realize their application in electrolytic water.The usual solution is to structure the material,dope heteroatoms or compound another material,but there are always various problems in the actual preparation process,so it is difficult to obtain a truly efficient bifunctional full-water-dissolving catalyst.In this paper,a series of experiments and explorations have been carried out around the preparation of two-dimensional transition metal compounds and their applications in the field of electrolytic water.According to the characteristics of transition metal hydroxides,different synthesis methods and composite objects were adopted,and nanostructured materials suitable for electrolytic water were designed purposefully,and good application results were obtained.The main contents of this paper are as follows:1.we first designed NiFe-OH into a super small nano plate structure vertically grown on the Ni nanotube wall by multi-step electrodeposition,and the nanotubes were uniformly covered on the surface of the three-dimensional porous nickel foam,enabling the whole electrode to have abundant catalytic active sites.2.Pre-plated Ni metal layer can solve the problem of insufficient conductivity of NiFe-OH and greatly accelerate the electron transport in catalysis.3.The heterogeneous interface between Ni metal layer and NiFe-OH provides a good adsorption site for hydrogen evolution reaction,which makes the material possess the advanced level of hydrogen evolution.Finally,we realized the hydrolysis test in 1M KOH solution,and the effect of 10 mA/cm2 current density can be achieved with only 1.56 V.