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Small methods: a new way based on external field (electric field, magnetic field, stress and light) to promote electrocatalytic hydrogen evolution and oxygen evolution

wallpapers News 2020-11-20
The sustainable development of

is one of the key challenges facing mankind. However the extensive use of fossil fuels has led to serious environmental problems. As one of the cleanest renewable energy sources hydrogen is an important substitute for fossil fuels. Electrocatalytic hydrolysis is an environmental protection technology for hydrogen production. However the slow half reaction hydrogen evolution reaction (her) oxygen evolution reaction (OER) seriously restrict its practical application. External field assisted electrocatalytic reaction refers to the application of external field in the process of electrocatalytic reaction. It provides an additional degree of freedom for electrolytic water. In recent years researchers have developed a series of field assisted her oer reactions.

recently in view of the progress problems challenges in this field Professor Yan Qingyu's team of Nanyang Technological University of Singapore published an online publication entitled "promoting electrochemical hydrogen evolution reaction oxygen evolution reaction by fields: effects of electric field magnetic field domain" on small methods And light.

are summarized in detail from the four dimensions of electric field magnetic field stress light:

1. The grid electric field can regulate the conductivity of the electrocatalyst the adsorption strength of the reaction intermediate at the active site (surface Gibbs free energy) the ion distribution at the heterogeneous interface of the catalyst / electrolyte through electrostatic coupling.

2. Magnetic field can accelerate the material transport in electrolyte through Lorentz force increase the local temperature of electrocatalyst through magnetocaloric effect regulate the reaction path of electrocatalysis through spin alignment. Stress can regulate the d-b of the active site including its energy level density of States so as to regulate its intrinsic activity.

4. Light can enhance the energy state of carriers by surface plasmon resonance effect enhance the local temperature of electrocatalyst by photothermal effect increase the conductivity of electrocatalyst by light induced semiconductor / insulator metal phase transition.

finally the prospect of field assisted electrocatalysis research is presented which is mainly divided into three aspects:

. 1. Structure optimization of field assisted electrocatalysis system. For example the use of a dielectric layer with high dielectric constant can increase the carrier concentration induced by grid voltage which is conducive to the promotion of electric field assisted electrocatalysis. In addition integrating the concentrating device into the electrocatalysis system to focus the incident light on the electrocatalyst is helpful to improve the utilization efficiency of the incident light.

2. Theoretically the diversity mutual compatibility of external fields provide abundant potential schemes for multi field assisted electrocatalytic reactions. For example convection caused by vertical magnetic field can accelerate the material transport of electrolyte while stress can regulate the intrinsic activity of electrocatalyst. Therefore the synergistic effect of magnetic field stress can improve the electrocatalytic rate.

3. Extension of field assisted electrocatalytic reactions (such as carbon dioxide reduction nitrogen reduction oxygen reduction). For example copper nanostructures are typical catalysts for carbon dioxide reduction. At the same time Cu is an efficient photothermal conversion material. Therefore the photo thermal effect assisted carbon dioxide reduction based on Cu based catalysts is a promising research topic.

in short as an auxiliary technology the external field can significantly improve the electrocatalytic performance it is highly compatible with traditional Nano Engineering which is of great significance for the design implementation of high-performance electrocatalytic system in the future.

[introduction of research group]

Professor Yan Qingyu (corresponding author) introduction of research group: Professor of School of materials science engineering Nanyang University of technology chairman of Electrochemical Society of Singapore member of FRSC. The main research fields of the research group are thermoelectric materials electrochemical energy storage materials. At present more than 300 papers have been published in nature machine intelligence nature communications science advances JACS angelwte chemistry advanced materials energy & Environmental Science chem Joule nano letters ACS Nano other international famous journals with a total citation of more than 25000. The h-index is 83. The highly cited scholars in Thomson Reuters materials field in 2018 2019.

research group homepage link: HTTPS// www.ntu.edu.sg/home/alexyan

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