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Efficient separation of photoexcited carriers in a g-CN-decorated WO nanowire array heterojunction as the cathode of a rechargeable Li-O battery
Ist Teil von
Nanoscale, 2020-09, Vol.12 (36), p.18742-18749
Erscheinungsjahr
2020
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
Utilization of solar energy is very important for alleviating the global energy crisis; however, solar-to-electric energy conversion in a compact battery is a great challenge. High charging overpotential of conventional aprotic Li-O
2
batteries still restricts their practical application. Herein, we propose a photo-involved rechargeable Li-O
2
battery to not only realize direct solar-to-electric energy conversion/storage but also address the overpotential issue. In this photo-involved battery system, the g-C
3
N
4
-decorated WO
3
nanowire array (WO
3
@g-C
3
N
4
NWA) heterojunction semiconductor is used as both the photoelectrode and oxygen electrode. Upon charging under visible-light irradiation, the photoexcited holes and electrons are
in situ
generated on the WO
3
@g-C
3
N
4
NWA heterojunction cathode. The fabrication of the heterojunction can distinctly reduce the recombination rate between electrons and holes, while photon-generated carriers are effectively and quickly separated and then migrate under a large current density. The discharge product (Li
2
O
2
) can be oxidized to O
2
and Li
+
with a reduced charging voltage (3.69 V) by the abundant photoexcited holes, leading to high energy efficiency, good cycling stability and excellent rate capability. This newly photo-involved reaction scheme could open new avenues toward the design of advanced solar-to-electric energy conversion and storage systems.
The efficient separation of photoexcited carriers within the g-C
3
N
4
-decorated WO
3
nanowire array distinctly reduces the charging voltage and enhances the cycle performance of the photo-involved Li-O
2
battery.
Sprache
Englisch
Identifikatoren
ISSN: 2040-3364
eISSN: 2040-3372
DOI: 10.1039/d0nr04956e
Titel-ID: cdi_rsc_primary_d0nr04956e
Format
–
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