CO2陰極還原和甲醇陽極氧化同步進行實現甲酸的電化學合成
作者:
小柯機器人發布時間:2020/11/10 21:47:41
中科院上海矽酸鹽所施劍林團隊的最新研究提出了通過電催化,同時進行二氧化碳還原和甲醇氧化以製取甲酸的方法。 相關論文於2020年11月8日發表在《德國應用化學》雜誌上。
在本文中,該研究組報告了一種同時進行陰極CO2還原反應和陽極部分甲醇氧化反應(MOR)的高效合成甲酸的通用策略,該體系的陰極催化劑使用了生長在碳布上的介孔二氧化錫(mSnO2/CC),陽極催化劑使用了生長在銅泡沫上的氧化銅納米片(CuONS/CF)。陽極的CuONS/CF使電極電勢降到了非常低的程度,在100 mA/cm2的電流密度下相對於可逆氫電極(RHE)只有1.47 V,和陽極析氧反應(OER)相比體現出顯著增加的電化學活性。
與此同時,陰極的mSnO2/CC在相對於可逆氫電極0.7 V的電勢下,在催化CO2轉化為甲酸方面表現出較高的法拉第效率(81%)。另外,使用這兩種電極組成的電解池在生產甲酸時只需在兩邊加上相當低的電壓,在10 mA/cm2的電流密度下僅需0.93 V。
據悉,通過電化學方法將二氧化碳轉化為含能化合物或高附加值化學品,對緩解溫室效應和高效利用二氧化碳排放意義重大。然而,這一方法通常受制於動力學上遲緩的陽極析氧反應(OER)及其產生的低附加值的副產物O2。
附:英文原文
Title: Formic Acid Electro‐synthesis by Concurrent Cathodic CO2 Reduction and Anodic CH3OH Oxidation
Author: Xinfa Wei, Yan Li, Lisong Chen, Jianlin Shi
Issue&Volume: 2020/11/08
Abstract: Electrochemical conversion of carbon dioxide into energy carrying compounds or value‐added chemicals is of great significance for diminishing the greenhouse effect and the efficient utilization of carbon dioxide emissions, which, however, suffers from the kinetic‐sluggish anodic oxygen evolution reaction (OER) and its less value‐added production of O 2 . Herein, we report a general strategy for efficient formic acid synthesis by concurrent cathodic CO 2 reduction and anodic partial methanol oxidation reaction (MOR), using mesoporous SnO 2 grown on carbon cloth (mSnO 2 /CC) and CuO nanosheets grown on copper foam (CuONS/CF) as cathodic and anodic catalysts, respectively. Anodic CuONS/CF enables an extremely lowered potential of 1.47 V versus reversible hydrogen electrode (RHE) to obtain 100 mA cm ‐2 , featuring a significantly enhanced electro‐activity in comparison to OER. Meanwhile, the cathodic mSnO 2 /CC shows a rather high Faraday efficiency of 81% at 0.7 V vs RHE for formic acid production from CO 2 . Moreover, the established electrolyzer equipped with CuONS/CF at the anode and mSnO 2 /CC at the cathode requires a considerably low cell voltage of 0.93 V at 10 mA cm 2 for formic acid production at both sides.
DOI: 10.1002/anie.202012066
Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202012066