VISIBLE LIGHT-DRIVEN CONVERSION OF CO2 OVER Cu2O/MXene
COMPOSITES
Magdaléna Linko á, Pa la Eliášo á, Luis A. M. Ca ascosa, Jiří Čejka
Facul y o Science, Cha les Uni e si y, Albe o 6, 128 00 P aha 2
This esea ch ocuses on con e ing ca bon dioxide, a p ominen g eenhouse gas, in o
alue-added p oduc s h ough pho o-elec oca aly ic p ocesses. We in es iga e Cu2O as
ou p ima y pho o esponsi e ma e ial due o i s abili y o be ac i a ed by isible ligh and
i s sui able edox po en ial o CO2 con e sion. Ou app oach seeks o add ess key
challenges wi h Cu2O, such as pho oco osion and apid cha ge ecombina ion. To his
end, we examined p,n-he e ojunc ion semiconduc o s composed o Cu2O and TiO2,
inco po a ing non-p ecious-me al-based co-ca alys s, speci ically MXenes (Scheme 1).¹
T ea ing MXenes, pa icula ly Ti3C2Tx, a empe a u es abo e 350°C and unde a ying
a mosphe es led o he in-si u o ma ion o TiO2 di ec ly on he MXene su ace. We
p epa ed a se ies o elec odes using luo ine-doped in oxide (FTO) glass as a subs a e,
wi h a laye o elec odeposi ed Cu2O and MXene o TiO2-MXene sp ay-coa ed on op.
On he p epa ed pho o-elec oca alys s, we conduc ed linea sweep ol amme y es s
using a 150W Xe-lamp in a 0.5M K2SO4, 0.5M KHCO3 elec oly e, sa u a ed wi h a gon
o CO2. Addi ionally, p oduc analysis was pe o med unde pho o-elec oca aly ic
condi ions a e 2 hou s o i adia ion using gas ch oma og aphy wi h TCD and BID
de ec o s. CO2 con e sion on he ba e Cu2O elec ode p oduced e hanol. When Cu2O was
coa ed wi h p e-calcined Ti3C2Tx, p oduc selec i i y shi ed owa d CO, H2, and
CH3COOH.
In his con ibu ion, we will explo e he ela ionship be ween he in-si u o med TiO2 on
Ti3C2Tx a a ious empe a u es and a mosphe es, and he o e all ca aly ic pe o mance
o he pho oca hodes.
Acknowledgemen :
Au ho s acknowledge P o . Michele A es a and D . Tomasz Ba an o CO2RR p oduc
analysis pe o med a IC2R L d - P.IVA 07459780727 - ia Camillo Rosalha 49, 70124,
Ba i, I aly. This wo k was inanced by he EU wi hin Ho izon Eu ope Resea ch –
DESIRED p ojec (p ojec code: 101083355).
Re e ences:
1 Low, J. e al. TiO2/MXene Ti3C2 Composi e wi h Excellen Pho oca aly ic CO2 Reduc ion
Ac i i y. Jou nal o Ca alysis 2018, 361, s55–266. DOI: 10.1016/j.jca .2018.03.009
Scheme 1: Ene gy band s uc u e o Cu2O, TiO2
and MXene, and edox po en ial o a ious CO2
p oduc s o ma ion.
Figu e 1: Linea sweep ol amme y o
FTO/Cu2O/TiO2-MXenes in 0.5M K2SO4, 0.5M
KHCO3 sa u a ed CO2 unde chop ligh i adia ion.
