当前位置: X-MOL 学术Joule › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
High-Current-Density CO2-to-CO Electroreduction on Ag-Alloyed Zn Dendrites at Elevated Pressure
Joule ( IF 39.8 ) Pub Date : 2020-01-07 , DOI: 10.1016/j.joule.2019.11.014
Sarah Lamaison , David Wakerley , Juliette Blanchard , David Montero , Gwenaëlle Rousse , Dimitri Mercier , Philippe Marcus , Dario Taverna , Domitille Giaume , Victor Mougel , Marc Fontecave

The electrocatalytic conversion of CO2 into valuable chemical feedstocks is a highly sought-after route to recycle CO2 emissions. Among the expected products, CO is a valuable synthon for organic syntheses and fuel generation. Nevertheless, most current electrocatalytic systems do not generate CO at a sufficient rate or purity for its subsequent direct conversion. Herein, we report the rational design of novel and highly active Ag-alloyed Zn dendritic electrodes with remarkable CO2-to-CO selectivity. Through fine-tuning of the individual electrodeposition parameters, the Ag content, porosity, thickness, and surface area of the electrodes were optimized, leading to a CO2-to-CO selectivity as high as 91%, which could be sustained above an average of 90% over 40 h. Increase of the CO2 pressure (up to 9.5 bar) to enhance the CO2 concentration allowed CO partial current densities as high as –286 mA.cm−2 to be achieved, setting a new record for predominantly Zn-based electrodes operating in neutral pH.



中文翻译:

银合金锌枝晶在高压下的高电流密度CO 2 -CO电还原

将CO 2电催化转化为有价值的化学原料是回收CO 2排放的极受追捧的途径。在预期的产品中,CO是有机合成和燃料产生的有价值的合成子。然而,大多数当前的电催化系统不能以足够的速率或纯度产生用于其随后的直接转化的CO。本文中,我们报告了新颖且具有高活性的Ag合金化Zn树枝状电极的合理设计,该电极具有显着的CO 2至CO选择性。通过微调各个电沉积参数,可优化电极的银含量,孔隙率,厚度和表面积,从而产生CO 2-CO选择性高达91%,可以在40小时内维持在平均90%以上。通过增加CO 2压力(最高9.5 bar)来提高CO 2浓度,可以实现高达–286 mA.cm -2的CO分流密度,从而为主要在中性条件下运行的基于Zn的电极创造了新记录pH值

更新日期:2020-01-07
down
wechat
bug