2D Assembly of Confined Space toward Enhanced CO2 Electroreduction. Issue 25 (5th July 2018)

• Record Type: Journal Article
• Authors: Han, Peng; Wang, Zhijie; Kuang, Min; Wang, Yifei; Liu, Jianing; Hu, Linfeng; Qian, Linping; Zheng, Gengfeng
• Is Part Of: Advanced energy materials. Volume 8:Issue 25(2018)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2018-07-05
• Subjects: 2D nanosheets -- assembly -- electrocatalytic CO2 reduction -- Faradaic efficiency -- interlayer spacings; Energy harvesting -- Materials -- Periodicals; Energy conversion -- Materials -- Periodicals; Energy storage -- Materials -- Periodicals; Photovoltaics -- Periodicals; Fuel cells -- Periodicals; Thermoelectric materials -- Periodicals; 621.31
• DOI: 10.1002/aenm.201801230
• Languages: English
• ISSNs: 1614-6832

Abstract

Abstract: Rational design of electrocatalysts toward efficient CO2 electroreduction has the potential to reduce carbon emission and produce value‐added chemicals. In this work, a strategy of constructing 2D confined‐space as molecular reactors for enhanced electrocatalytic CO2 reduction selectivity is demonstrated. Highly ordered 2D nanosheet lamella assemblies are achieved via weak molecular interaction of atomically thin titania nanosheets, a variety of cationic surfactants, and SnO2 nanoparticles. The interlayer spacings can be tuned from 0.9 to 3.0 nm by using different surfactant molecules. These 2D assemblies of confined‐space catalysts exhibit a strong size dependence of CO2 electroreduction selectivity, with a peak Faradaic efficiency of 73% for formate production and excellent electrochemical stability at an optimal interspacing of ≈2.0 nm. This work suggests great potential for constructing new molecular‐size reactors, for highly selective electrocatalytic CO2 reduction. Abstract : A strategy of constructing 2D confined‐space as molecular reactors is demonstrated via weak molecular interaction of a variety of atomically thin titania nanosheets, cationic surfactants, and SnO2 nanoparticles. The interlayer spacings can be tuned from 0.9 to 3.0 nm by using different surfactant molecules. These 2D assemblies of confined space catalysts exhibit a strong size dependence of CO2 electroreduction selectivity.