Recent Progress of Metal Single-atom Catalysts for Energy Applications

The electrochemical CO2 reduction reaction can effectively convert CO2 into promising fuels and chemicals, which is helpful in establishing a low-carbon emission economy. Compared with other types of electrocatalysts, single-atom catalysts (SACs) immobilized on carbon substrates are considered to be promising candidate catalysts. Atomically dispersed SACs exhibit excellent catalytic performance in CO2RR due to their maximum atomic utilization, unique electronic structure, and coordination environment. In this paper, we first briefly introduce the synthetic strategies and characterization techniques of SACs. Then, we focus on the optimization strategies of the atomic structure of carbon-based SACs, including adjusting the coordination atoms and coordination numbers, constructing the axial chemical environment, and regulating the carbon substrate, focusing on exploring the structure-performance relationship of SACs in the CO2RR process. In addition, this paper also briefly introduces the diatomic catalysts (DACs) as an extension of SACs. At the end of the paper, we summarize the article with an exciting outlook discussing the current challenges and prospects for research on the application of SACs in CO2RR.

Emerging materials for electrochemical CO2 reduction: progress and optimization strategies of carbon-based single-atom catalysts.

Structural construction of Bi-anchored honeycomb N-doped porous carbon catalyst for efficient CO2 conversion

The conversion of CO2 into high-value fuels and chemicals through electrochemical CO2 reduction reaction (CO2RR) might be one effective way to control current effects of greenhouse gas emissions. However, the slow kinetics and side reactions involved in the process of CO2RR lead to low selectivity, inactivity and limited durability. Additionally, CO2RR is less selective for hydrocarbons due to interference by the hydrogen evolution reaction (HER) and the multiple electron transfer processes involved in the reaction process. In fact, CO2RR is sensitive to the dynamic changes of the catalyst and non-catalyst components (i.e. the reaction micro-environment) at the electrode/electrolyte interface. These factors regulate the transportation of reactive substances, and also affect the intermediates and the paths of the electrocatalytic reaction. There is a large body of literature in this field that focuses on the structure (chemical state, composition, crystal surface and morphology) of the electrocatalyst for CO2RR. Although the impact of the reaction conditions (including temperature and pressure) on CO2RR should not be underestimated, to date, few studies have been done on this aspect. In this mini review, we first describe the evaluation parameters, the current mainstream catalysts and then, by focusing on the effect of temperature and pressure in the CO2RR, elucidate on its controlling influence on the performance of CO2RR. Finally, current problems and future development trends are summarized. We suggest that this review may provide some theoretical basis for the design of catalytic CO2RR processes. 

Effect of temperature and pressure on electrochemical CO2 reduction: a mini review

Cu/Fe3O4 Nanocomposites from Layered Double Hydroxides as Catalysts for Selective Electroreduction of Carbon Dioxide

https://onlinelibrary.wiley.com/doi/pdf/10.1002/ese3.889

Electrodeposition of Ni on MWNTs as a promising catalyst for CO2RR

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Electrodeposition of Ni on MWNTs as a promising catalyst for CO2RR