Mechanochemically synthesized Pb-free halide perovskite-based Cs2AgBiBr6-Cu-RGO nanocomposite for photocatalytic CO2 reduction
File(s)
Published version
Author(s)
Kumar, Santosh
Eslava, Salvador
Type
Journal Article
Abstract
Pb-based halide perovskites have recently showed great potential in various applications such as solar cells, optoelectronics and photocatalysis. Despite their high performance, the Pb2+ toxicity along with poor stability hinders long term applications in photocatalysis. Herein, we report mechanochemically prepared Pb-free Cs2AgBiBr6 double perovskite nanoplates and their heterostructure with Cu-loaded reduced graphene oxide (Cu–RGO) for gas-phase photocatalytic CO2 reduction using water vapor as the proton source in the absence of a hole scavenger. The resulting Cs2AgBiBr6–Cu–RGO nanocomposite shows significant photocatalytic activity of 10.7 (±0.6) μmol CH4 g−1 h−1, 1.9 (±0.3) μmol CO g−1 h−1 and 1.0 (±0.2) μmol H2 g−1 h−1, with a CH4 selectivity of 93.0 (±0.5)% on an electron basis with 1 sun and a remarkable apparent quantum efficiency of 0.89 (±0.21)% at 590 nm. A further 32% enhancement in photocatalytic activity on an electron basis is achieved when the light intensity is doubled (2 suns). The high performance was attributed to their improved charge separation and suppressed electron–hole recombination, along with extended visible light absorption, better stability in a humid environment and improved CO2 adsorption. These findings support Cs2AgBiBr6 as a potential Pb-free alternative to conventional halide perovskites for photocatalytic solar-to-fuel conversion and CO2 utilization.
Date Issued
2021-05-05
Date Acceptance
2021-05-04
Citation
Journal of Materials Chemistry A, 2021, 5/5/21 (20), pp.12179-12187
ISSN
2050-7488
Publisher
Royal Society of Chemistry
Start Page
12179
End Page
12187
Journal / Book Title
Journal of Materials Chemistry A
Volume
5/5/21
Issue
20
Copyright Statement
© The Royal Society of Chemistry 2021. This article is licensed under a Creative Commons Attribution 3.0 Unported Licence.
License URL
Sponsor
ESPRC
Engineering & Physical Science Research Council (EPSRC)
Engineering & Physical Science Research Council (EPSRC)
Identifier
https://pubs.rsc.org/en/content/articlelanding/2021/TA/D1TA01281A#!divAbstract
Grant Number
EP/S030727/1
EP/S030727/1
EP/R035407/2
Subjects
Science & Technology
Physical Sciences
Technology
Chemistry, Physical
Energy & Fuels
Materials Science, Multidisciplinary
Chemistry
Materials Science
ARTIFICIAL PHOTOSYNTHESIS
GRAPHENE OXIDE
WATER
EVOLUTION
OXIDATION
CATALYSTS
TIO2
CH4
0303 Macromolecular and Materials Chemistry
0912 Materials Engineering
0915 Interdisciplinary Engineering
Publication Status
Published
Date Publish Online
2021-05-05