当前位置: X-MOL 学术Nat. Catal. › 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.)
Efficient electrocatalytic CO 2 reduction on a three-phase interface
Nature Catalysis ( IF 42.8 ) Pub Date : 2018-07-23 , DOI: 10.1038/s41929-018-0108-3
Jun Li , Guangxu Chen , Yangying Zhu , Zheng Liang , Allen Pei , Chun-Lan Wu , Hongxia Wang , Hye Ryoung Lee , Kai Liu , Steven Chu , Yi Cui

Electrochemical CO2 reduction is a critical approach to reducing the globally accelerating CO2 emission and generating value-added products. Despite great efforts to optimize catalyst activity and selectivity, facilitating the catalyst accessibility to high CO2 concentrations while maintaining electrode durability remains a significant challenge. Here, we designed a catalytic system that mimics the alveolus structure in mammalian lungs with high gas permeability but very low water diffusibility, enabling an array of three-phase catalytic interfaces. Flexible, hydrophobic, nanoporous polyethylene membranes with high gas permeability were used to enable efficient CO2 access and a high local alkalinity on the catalyst surface at different CO2 flow rates. Such an alveolus-mimicking structure generates a high CO production Faradaic efficiency of 92% and excellent geometric current densities of CO production (25.5 mA cm−2) at −0.6 V versus the reversible hydrogen electrode, with a very thin catalyst thickness of 20−80 nm.



中文翻译:

在三相界面上高效电催化还原CO 2

电化学减少CO 2是减少全球范围内加速CO 2排放并产生增值产品的关键方法。尽管为优化催化剂活性和选择性做出了巨大努力,但是在保持电极耐用性的同时,促进催化剂易于达到高CO 2浓度仍然是一个重大挑战。在这里,我们设计了一种催化系统,该系统可以模拟哺乳动物肺中的肺泡结构,具有高的气体渗透性,但水扩散性非常低,因此可以实现一系列三相催化界面。使用具有高透气性的柔性疏水性纳米多孔聚乙烯膜以实现有效的CO 2在不同的CO 2流速下,在催化剂表面具有较高的可及性和较高的局部碱度。与可逆氢电极相比,这种可模仿肺泡的结构产生高的CO产生法拉第效率,达到92%,在-0.6 V时产生出色的CO产生的几何电流密度(25.5 mA cm -2),催化剂厚度非常薄,仅为20- 80纳米

更新日期:2018-07-24
down
wechat
bug