posted on 2023-01-09, 18:04authored byHongmin Liu, Pankun Wu, Ronghao Wang, Huanjiang Meng, Yaqi Zhang, Weizhai Bao, Jingfa Li
The
combination of photo-driven self-powered supplies and energy
storage systems is considered as a promising candidate to solve the
global energy dilemma. The photo-absorber and the energy storage material
are integrated into the photocathode to effectively achieve a high-energy
and high-efficiency energy system. In this work, we report the customized Janus-jointed photocathode design (integrating with highly
efficient halide perovskite and tellurium composite electrode) and
introduce it into the aqueous zinc–tellurium battery. The well-matched
energy level of the Janus-jointed photocathode ensures
the conversion of the photoenergy into electrical energy by transferring
the photoexcited charge between each. As expected, in the photo-assisted
recharging model, the decreased 0.1 V charge voltage and the extra
362 mA h g–1 at 100 mA g–1 demonstrated
the significant merits of saving energy for such a photo-rechargeable
Zn–Te (PRZT) battery. When the current density is 1000 mA g–1, the specific capacity of the prepared photocathode
is 83% higher than that under dark conditions. More importantly, the
photogenerated charge by the perovskite under light illumination could
also directly photocharge the battery with no external current, indicating
the self-powering traits. The rational design in this work is believed
to provide a sustainable mode for efficient charging of the aqueous
PRZT battery.