Promoting Ethylene Selectivity from CO2 Electroreduction on CuO Supported onto CO2 Capture Materials,ChemSusChem

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Promoting Ethylene Selectivity from CO2 Electroreduction on CuO Supported onto CO2 Capture Materials
ChemSusChem ( IF 7.5 ) Pub Date : 2018-02-15 , DOI: 10.1002/cssc.201702338
Hui-Juan Yang ₁ , Hong Yang ₁ , Yu-Hao Hong ₁ , Peng-Yang Zhang ₁ , Tao Wang ₁ , Li-Na Chen ₁ , Feng-Yang Zhang ₁ , Qi-Hui Wu ₂ , Na Tian ₁ , Zhi-You Zhou ₁ , Shi-Gang Sun ₁

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Cu is a unique catalyst for CO₂ electroreduction, since it can catalyze CO₂ reduction to a series of hydrocarbons, alcohols, and carboxylic acids. Nevertheless, such Cu catalysts suffer from poor selectivity. High pressure of CO₂ is considered to facilitate the activity and selectivity of CO₂ reduction. Herein, a new strategy is presented for CO₂ reduction with improved C₂H₄ selectivity on a Cu catalyst by using CO₂ capture materials as the support at ambient pressure. N‐doped carbon (N_xC) was synthesized through high‐temperature carbonization of melamine and l‐lysine. We observed that the CO₂ uptake capacity of N_xC depends on both the microporous area and the content of pyridinic N species, which can be controlled by the carbonization temperature (600–800 °C). The as‐prepared CuO/N_xC catalysts exhibit a considerably higher C₂H₄ faradaic efficiency (36 %) than CuO supported on XC‐72 carbon black (19 %), or unsupported CuO (20 %). Moreover, there is a good linear relationship between the C₂H₄ faradaic efficiency and CO₂ uptake capacity of the supports for CuO. The local high CO₂ concentration near Cu catalysts, created by CO₂ capture materials, was proposed to increase the coverage of CO intermediate, which is favorable for the coupling of two CO units in the formation of C₂H₄. This study demonstrates that pairing Cu catalysts with CO₂ capture supports is a promising approach for designing highly effective CO₂ reduction electrocatalysts.

中文翻译：

负载在CO2捕集材料上的CuO上的CO2电解还原可提高乙烯的选择性

Cu是用于CO ₂电解还原的独特催化剂，因为它可以催化将CO ₂还原为一系列烃，醇和羧酸。然而，这种Cu催化剂的选择性差。认为CO _2的高压促进了CO ₂还原的活性和选择性。在本文中，一种新的策略提出了用于CO ₂还原改良过的C ₂ ħ ₄通过使用CO在Cu催化剂选择性₂捕获材料在环境压力下的支持。N掺杂碳（N _x C）是通过三聚氰胺和l的高温碳化而合成的赖氨酸。我们观察到，N _x C的CO ₂吸收能力取决于微孔面积和吡啶类N物种的含量，这可以通过碳化温度（600–800°C）来控制。所制备的CuO / N _x C催化剂比XC-72炭黑负载的CuO（19％）或未负载的CuO（20％）表现出更高的C ₂ H ₄法拉第效率（36％）。此外，C ₂ H ₄法拉第效率和载体对CuO的CO ₂吸收能力之间具有良好的线性关系。由CO ₂产生的Cu催化剂附近的局部高CO ₂浓度为了提高CO中间体的覆盖率，提出了一种捕集材料的方法，这有利于两个CO单元在C ₂ H ₄形成中的偶联。这项研究表明，将Cu催化剂与CO ₂捕获载体配对是设计高效CO ₂还原电催化剂的一种有前途的方法。

更新日期：2018-02-15

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