Issue 9, 2020

How to make an efficient gas-phase heterogeneous CO2 hydrogenation photocatalyst

Abstract

Tailoring the performance of a photocatalyst by design is challenge in the field of renewable synthetic fuels. Herein, polymorphic heterostructures comprised of two indium oxide based photocatalysts, with distinct structures yet continuously adjustable fractions of the same composition, enable optimization of the activity and selectivity of CO2 hydrogenation to CO and CH3OH. The strategy rests on the cubic (c-) to rhombohedral (rh-) indium oxide hydroxide In2O3−x(OH)y phase transition, in which the fraction of the cubic phase that nucleates and grows within the rhombohedral phase is under precise structural and compositional control. Interfaces so-formed between cubic and rhombohedral polymorphs with distinct electronic band structures as well as separate locations of electron trapping oxygen vacancies and hole trapping hydroxyl defects in individual In2O3−x(OH)y components, enable charge generation, separation and lifetimes of photogenerated electron–hole pairs to be finely tuned. This facilitates command over H2 and CO2 surface chemical reactions that are responsible for the activity and selectivity towards products CO and CH3OH. The control over the performance metrics of a CO2 hydrogenation photocatalyst provided by tuneable rh/c-In2O3−x(OH)y polymorphic heterostructures, affords promising opportunities for the future development of renewable synthetic fuels.

Graphical abstract: How to make an efficient gas-phase heterogeneous CO2 hydrogenation photocatalyst

Supplementary files

Article information

Article type
Paper
Submitted
10 Apr 2020
Accepted
04 Aug 2020
First published
04 Aug 2020

Energy Environ. Sci., 2020,13, 3054-3063

How to make an efficient gas-phase heterogeneous CO2 hydrogenation photocatalyst

T. Yan, N. Li, L. Wang, Q. Liu, A. Jelle, L. Wang, Y. Xu, Y. Liang, Y. Dai, B. Huang, J. You and G. A. Ozin, Energy Environ. Sci., 2020, 13, 3054 DOI: 10.1039/D0EE01124J

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements