On April 13, the reporter learned that, with the support of the key project of "advanced research on large scientific devices", Zhu Qinggong and Han Buxing research groups of the Institute of chemistry, Chinese Academy of Sciences, found that the excellent performance of copper selenide nano catalyst in the production of methanol by electrochemical reduction of carbon dioxide was found. Under the low overvoltage of 285mv, the current density could be as high as 41.5 The Faraday efficiency is 77.6%. The current density is higher than that reported at present, and the Faraday efficiency of methanol production is very high. The catalyst is also very stable in the reaction, in which copper and selenium have a good synergistic effect. This work is reported to be the first electrochemical reduction of carbon dioxide with copper selenide as catalyst. It is also pointed out that some other transition metal selenides can be designed as effective electrocatalysts for carbon dioxide reduction. The related research results were recently published in nature communications.
The use of a large number of fossil fuels has led to the increasing concentration of global atmospheric carbon dioxide. The conversion of carbon dioxide into fuel through electroreduction is one of the most promising ways to realize the carbon cycle, which may reduce our dependence on fossil fuels and reduce air pollution. Some electrocatalysts, such as noble metal and copper based catalysts, have been shown to be able to produce methanol by electroreduction of carbon dioxide. However, it is still a challenge to convert carbon dioxide to methanol at high current density and high Faraday efficiency (percentage of actual to theoretical products).
Energy shortage and environmental pollution are the most serious problems facing the development of human society. The current world energy consumption is still dominated by fossil energy. Increasing human activities will not only accelerate the consumption of fossil fuels, but also increase the emission of greenhouse gases, mainly CO2, in the atmosphere, breaking the carbon balance in nature. Since the end of the 19th century, the concentration of CO2 in the atmosphere has increased from 280 ppm to the current 400 ppm. In this context, exploring effective techniques for reducing the concentration of CO2 in the atmosphere has become a key research direction for governments and scientists in various countries. Among several feasible strategies, the technology of reducing CO2 by electrochemical or photochemical means and converting it into hydrocarbon fuels beneficial to humans is particularly attractive. Because these two methods can be carried out at room temperature and pressure, the required energy can be directly or indirectly provided by renewable energy sources such as solar energy, realizing the recycling of carbon elements. Although the technical routes of the two strategies of CO2 electrocatalytic reduction and photocatalytic reduction are different, their essence is the same: that is, how to activate the inert CO2 molecules and promote their reduction and conversion. In addition, the electron transfer and CO2 activation process of the photocatalytic process is essentially an electrochemical process, and can be enhanced by appropriate promoters.
In recent years, metal nanomaterials, non-metallic nanomaterials, and semiconductor nanomaterials have been widely introduced into luminescent systems due to their superior catalytic activity, biocompatibility, and easy self-assembly. They have been successfully used in bioanalysis. These studies have made important progress in improving the sensitivity of analysis methods and shortening the analysis time. In the past, the research field of chemiluminescence was mainly limited to systems such as molecules and ions. In recent years, with the rapid development of nanotechnology, the liquid phase chemiluminescence reaction involving nanomaterials has received widespread attention. This paper introduces common chemiluminescence systems, and summarizes the chemiluminescence systems involving nanomaterials and their applications in analytical chemistry. The laboratory found that semiconductor nanoparticles, copper selenide nanoparticles, can be used as catalysts to enhance the chemiluminescence signal of the liquid phase luminol hydrogen peroxide system. However, the commonly used nanoparticles that have been reported are mainly concentrated in precious metal nanoparticles such as nano gold and silver. There are very few reports on the study of copper selenide catalyzed chemiluminescence. Therefore, in this paper, copper selenide nanoparticles are applied in the liquid phase chemiluminescence system, the catalytic effect of copper selenide nanoparticles on the luminol chemiluminescence system is studied, and the mechanism of catalytic chemiluminescence is further discussed and applied to biology. In the detection of molecules, the results show that the sensitivity of analysis has been further improved and the linear range of the analysis method has been broadened. The specific research content includes the following three aspects: (1) Establish a new method for detecting cholesterol with copper selenide catalyzed by chemiluminescence.
This research work laid the foundation for the rational design of electrocatalysts that can produce high current density, high selectivity, high activity and high robustness, and is of great significance for the large-scale application of carbon dioxide electroreduction.
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