Efficient Bifunctional Photoelectric Integrated Cathode for Solar Energy Conversion and Storage

Abstract

The integrated photoelectric battery serves as a compact and energy-efficient form for direct conversion and storage of solar energy compared to the traditional isolated PVbattery systems. However, combining efficient light harvesting and electrochemical energy storage into a single material is a great challenge. Here, a bifunctional lead phytate−cesium lead bromide (PbPA-CsPbBr 3 ) cathode is explored for the solidstate batteries in terms of CsPbBr 3 in situ grown on the PbPA framework. Specifically, CsPbBr 3 nanocrystals generate electron−hole pairs under sunlight, the holes contribute to the lithium desorption of the discharged PbPA, and the electrons participate in the formation of the cathode interfacial film through oxygen reduction. The obtained solid-state photoelectric lithium-metal battery achieved a photoconversion efficiency of 0.72%, outperforming other systems under the same lighting conditions. The reasonable cathode design and its application in integrated solid-state batteries provide an efficient way for solar energy utilization.

Complementary Weaknesses: A Win‐Win Approach for rGO/CdS to Improve the Energy Conversion Performance of Integrated Photorechargeable Li−S Batteries

“…This makes IPRBs highly suitable for modern portable and smart devices like mobile phones, computers, and watches, highlighting their significant potential for widespread use in today's technology-driven world. [6][7] Currently, although IPRBs are favored for those abovementioned advantages, the research stream of IPRBs systems still faces several challenges. Firstly, the overall solar-to-electrical energy conversion efficiency (η STE ) should be the primary concern, which is also one of the most important parameters of PRB technologies.…”

3D Hierarchical Sunflower‐Shaped MoS2/SnO2 Photocathodes for Photo‐Rechargeable Zinc Ion Batteries

“…[ 4 , 5 , 6 ] Therefore, the design and development of solar‐driven energy systems integrating electricity generation and storage are highly desirable yet greatly challenging. [ 7 , 8 , 9 , 10 , 11 , 12 , 13 ]…”

What Makes a Photobattery Light-Rechargeable?

“…Irrespective of the system, a crucial requirement for photo charging is favorable band alignment between the light-absorber and the anode in order to enable charge transfer between the electrodes . Nevertheless, the exact energetic requirements for photocharging remain a matter of debate in the field, with several papers presenting photocharging in systems where the photoactive element appears to provide insufficient potential to drive the primary charging reaction claimed. ,,− Here, we use a 3-electrode system consisting of a dye-sensitized TiO 2 photocathode, triiodide catholyte (I – /I 3 – ) and Li 1+x Mn 2 O 4 /LiMn 2 O 4 (LMO) or Li 4 Ti 5 O 12 /Li 7 Ti 5 O 12 (LTO) anodes to study charge transfer based on energy level alignment in light-rechargeable photobatteries. A schematic of the system is provided in Figure showing that the device is composed of a dye-sensitized solar cell (DSSC) component and a battery component.…”

“…Hence, it is imperative that alternate mechanisms are put forward to address this apparent “photocharging” phenomenon. For example, Pan et al proposed that trace amounts of atmospheric oxygen may be leaking through the window of the photobattery and participating LiO 2 and Li 2 O 2 formation on the cathode, resulting in a change in cell OCV, whereas Mathieson et al proposed the buildup of a capacitive double layer due to photogenerated holes on the cathode.…”