Developing new optimized bifunctional photocatalyst is of great significant for achieving the high-performance photo-assisted Li-O 2 batteries. Herein, a novel bifunctional photo-assisted Li-O 2 system is constructed by using siloxene nanosheets with ultra-large size and few-layers due to its superior light harvesting, semiconductor characteristic, and low recombination rate. An ultra-low charge potential of 1.90 V and ultra-high discharge of 3.51 V have been obtained due to the introduction of this bifunctional photocatalyst into Li-O 2 batteries, and these results have realized the round-trip efficiency up to 185 %. In addition, this photo-assisted Li-O 2 batteries exhibits a high rate (129 % round-trip efficiency at 1 mAcm À2 ), a prolonged cycling life with 92 % efficiency retention after 100 cycles, and the highly reversible capacity of 1170 mAh g À1 at 0.75 mA cm À2 . This work will open the vigorous opportunity for high-efficiency utilization of solar energy into electric system.
In order to increase the capacity and improve the sluggish Na+-reaction kinetics of anodes as sodium ion capacitors (SICs), Ti2Nb2O9/CNF self-standing film electrode comprised of Ti2Nb2O9 nanosheets and carbon nanofibers...
Directly
integrating the bifunctional photoelectrode into Li–O2 batteries has been considered an effective way to reduce
the overpotential and promote electric energy saving. However, more
regular investigations on various bifunctional photocatalysts have
still been desired for high-performance photoassisted Li–O2 batteries. Herein, a systematic exploration of various-sized
siloxene photocatalysts affected by Li–O2 batteries
has been introduced. Compared with the utilization of larger-sized
siloxene nanosheets (SNSs), the photoassisted Li–O2 battery with a siloxene quantum dot (SQD) photoelectrode delivers
a superior round-trip efficiency of 230% based on the highest discharge
potential up to 3.72 V and lowest charge potential of 1.60 V and enables
the maintenance of a long-term cycling life with only 13% efficiency
attenuation after 200 cycles at 0.075 mA/cm2. Furthermore,
this system exhibits a record-high rate-cycling performance (162%
round-trip efficiency, even at 3 mA/cm2) and a high discharge
capacity of 2212 mAh/g at 1 mA/cm2. These ground-breaking
performances could be attributed to the synergistic effect of the
photocatalytic and electrocatalytic activities of SQD photocatalysts
with the ideal conduction band/valence band values, the abundant defective
sites, and the stronger O2 and lower LiO2 adsorption
strengths of SQD photocatalysts. These systematic research studies
highlight the significance of SQD bifunctional photocatalysts and
could be extended to other photocatalysts for further high-efficiency
photoelectric conversion and storage.
Developing new optimized bifunctional photocatalyst is of great significant for achieving the high-performance photo-assisted Li-O 2 batteries. Herein, a novel bifunctional photo-assisted Li-O 2 system is constructed by using siloxene nanosheets with ultra-large size and few-layers due to its superior light harvesting, semiconductor characteristic, and low recombination rate. An ultra-low charge potential of 1.90 V and ultra-high discharge of 3.51 V have been obtained due to the introduction of this bifunctional photocatalyst into Li-O 2 batteries, and these results have realized the round-trip efficiency up to 185 %. In addition, this photo-assisted Li-O 2 batteries exhibits a high rate (129 % round-trip efficiency at 1 mAcm À2 ), a prolonged cycling life with 92 % efficiency retention after 100 cycles, and the highly reversible capacity of 1170 mAh g À1 at 0.75 mA cm À2 . This work will open the vigorous opportunity for high-efficiency utilization of solar energy into electric system.
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