In-situ synthesis of cobalt boride nanoarrays: a highly efficient electrocatalytic catalyst for total water splitting

The global energy crisis and environmental pollution caused by the burning of fossil fuels have prompted researchers to search for clean and renewable energy. Electrocatalytic decomposition of water to produce hydrogen and oxygen is a potential strategy to solve this energy and environmental problem. However, the decomposition of water is a very difficult reaction process in thermodynamics. It usually requires a higher overpotential to achieve the complete water splitting process of hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) at the same time, which greatly hinders The development of electrocatalytic total water splitting. Therefore, the development of a dual-functional water splitting catalyst with high efficiency and abundant earth resources is highly attractive.

In recent years, the research on transition metal-based dual-functional catalysts (including alloys, oxides, hydroxides, sulfides, phosphides, etc.) has achieved great success and is considered to be expected to replace traditional noble metal electrocatalysts. Transition metal borides have become an important scientific and technological research subject because of their attractive physical and chemical properties. In recent years, some research results indicate that transition metal boride has become an effective water splitting catalyst, such as: molybdenum boride (MoB), cobalt boride (Co-B), nickel boride (Ni-B), cobalt doped Mixed nickel boride (Co-Ni-B) and so on. However, most of the transition metal borides prepared by the current synthesis methods are particles or blocks with random morphology. Its ubiquitous shortcomings, such as low surface exposed active sites and large series resistance, inhibit the further improvement of its electrocatalytic performance. The catalyst directly grown on the nanoarray is a more effective catalyst. It is a self-assembled electrode that does not require polymer connection. It has stronger stability, lower series resistance, more active sites and Advantages such as higher diffusion rate. Therefore, the preparation of a Co-B nanoarray electrode is a very urgent and challenging task.

This electrocatalyst is prepared from Co-B nanoparticles grown on the surface of CoO nano-arrays in-situ by cobalt oxide (CoO) nano-arrays grown on a titanium mesh and treated with alkaline sodium borohydride solution. Wrap CoO (Co-B@CoO) nano array. Compared with general electrocatalysts, Co-B@CoO nanoarrays have highly exposed electrocatalytic reaction active sites and significantly improved conductivity. As a three-dimensional dual-function catalyst electrode, compared with CoO/Ti nanoarray, this Co-B@CoO/Ti nanoarray exhibits excellent catalytic performance (50 mA· It has a low overpotential of 102 and 290 mV at current density of cm-2, respectively. During the total electrolysis of water, the Co-B@CoO nanoarray electrode has a catalytic current of up to 50 mA·cm-2 at a potential of 1.67 V, and has Good catalytic stability. In order to study the intrinsic characteristics of this electrocatalytic material in more depth and detail, through the analysis of electrochemical impedance diagram and nitrogen adsorption/desorption isotherm, the researchers found that its superior catalytic performance mainly comes from Co -B@CoO nanoarrays have a faster reaction rate and more electrocatalytic active sites. At the same time, larger catalyst loading and specific surface area are also one of the reasons why Co-B@CoO nanoarrays have high-efficiency catalytic performance. This paper proposes a new method for preparing Co-B nanoarrays by generating Co-B nanoparticles in situ on the surface of cobalt oxide nanoarrays, in order to explore the application of metal boride nanoarrays in electrochemical energy conversion, storage and sensing. Provides new research ideas in the field.

Overview of cobalt boride CoB powder

Cobalt boride is an inorganic compound with the general formula CoxBy. The two main types of cobalt boride are Cob and Co2B. These are refractory materials. Prismatic rhomboid crystals. Cobalt boride has very high magnetic properties. Soluble in nitric acid and aqua regia. Decomposes in water. When used as a catalyst, cobalt boride is prepared by reducing a cobalt salt such as cobalt(II) nitrate with sodium borohydride. Before reduction, the surface area of the catalyst can be maximized by loading the salt on another material. Usually, this material is activated carbon.

The chemical formula of cobalt boride is CoB and the molecular weight is 69.74. It is a prismatic rhombic crystal with strong magnetism. Cobalt boride dissolves in nitric acid and aqua regia, and decomposes in water.

Application of cobalt boride CoB powder

Materials Science

As we all know, cobalt boride has special oxidation resistance, and this chemical property makes it very useful in the field of materials science. For example, studies have shown that when cobalt boride is used as a coating, it can extend the service life of metal parts and give the surface higher corrosion and wear resistance. In the field of biomedicine, these features have been used to design specialized drug delivery systems.

Renewable energy

Cobalt boride is also being studied as a catalyst for hydrogen storage and fuel cell technology.

Organic Synthesis

Cobalt boride is also an effective hydrogenation catalyst for organic synthesis. In a study, it was found that cobalt boride is the most selective transition metal-based catalyst for the production of primary amines by nitrile reduction, even surpassing other cobalt-containing catalysts.

Cobalt boride CoB powder price

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