当前位置:科学网首页 > 小柯机器人 >详情
CO2阴极还原和甲醇阳极氧化同步进行实现甲酸的电化学合成
作者:小柯机器人 发布时间:2020/11/10 21:47:41

中科院上海硅酸盐所施剑林团队的最新研究提出了通过电催化,同时进行二氧化碳还原和甲醇氧化以制取甲酸的方法。 相关论文于2020年11月8日发表在《德国应用化学》杂志上。

在本文中,该研究组报告了一种同时进行阴极CO2还原反应和阳极部分甲醇氧化反应(MOR)的高效合成甲酸的通用策略,该体系的阴极催化剂使用了生长在碳布上的介孔二氧化锡(mSnO2/CC),阳极催化剂使用了生长在铜泡沫上的氧化铜纳米片(CuONS/CF)。阳极的CuONS/CF使电极电势降到了非常低的程度,在100 mA/cm2的电流密度下相对于可逆氢电极(RHE)只有1.47 V,和阳极析氧反应(OER)相比体现出显著增加的电化学活性。

与此同时,阴极的mSnO2/CC在相对于可逆氢电极0.7 V的电势下,在催化CO2转化为甲酸方面表现出较高的法拉第效率(81%)。另外,使用这两种电极组成的电解池在生产甲酸时只需在两边加上相当低的电压,在10 mA/cm2的电流密度下仅需0.93 V。

据悉,通过电化学方法将二氧化碳转化为含能化合物或高附加值化学品,对缓解温室效应和高效利用二氧化碳排放意义重大。然而,这一方法通常受制于动力学上迟缓的阳极析氧反应(OER)及其产生的低附加值的副产物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

期刊信息

Angewandte Chemie:《德国应用化学》,创刊于1887年。隶属于德国化学会,最新IF:12.959
官方网址:https://onlinelibrary.wiley.com/journal/15213773
投稿链接:https://www.editorialmanager.com/anie/default.aspx