Abstract
Simultaneously harvesting, converting and storing solar energy in a single device represents an ideal technological approach for the next generation of power sources. Herein, we propose a device consisting of an integrated carbon-based perovskite solar cell module capable of harvesting solar energy (and converting it into electricity) and a rechargeable aqueous zinc metal cell. The electrochemical energy storage cell utilizes heterostructural Co2P-CoP-NiCoO2 nanometric arrays and zinc metal as the cathode and anode, respectively, and shows a capacity retention of approximately 78% after 25000 cycles at 32 A/g. In particular, the battery cathode and perovskite material of the solar cell are combined in a sandwich joint electrode unit. As a result, the device delivers a specific power of 54 kW/kg and specific energy of 366 Wh/kg at 32 A/g and 2 A/g, respectively. Moreover, benefiting from its narrow voltage range (1.40–1.90 V), the device demonstrates an efficiency of approximately 6%, which is stable for 200 photocharge and discharge cycles.
Highlights
Harvesting, converting and storing solar energy in a single device represents an ideal technological approach for the generation of power sources
The integrated solar rechargeable zinc battery (SRZB) has a layer-by-layer structure, where the solar energy-conversion unit and energy storage unit are connected into one structural unit via a sandwich joint electrode (Fig. 1)
Following the 4H1L principle, we present a brief comparison of various solar rechargeable devices
Summary
Harvesting, converting and storing solar energy in a single device represents an ideal technological approach for the generation of power sources. We propose a device consisting of an integrated carbon-based perovskite solar cell module capable of harvesting solar energy (and converting it into electricity) and a rechargeable aqueous zinc metal cell. Traditional SRSs consist of wire-connected independent solar cells and energy storage modules. Such a four-electrode structure is easy to fabricate and efficient but needs additional inactive components that are redundant, which results in increased cost and wasted space[3,4]. By combining solar cells and secondary batteries, such as Li-ion batteries (LIBs)[11,12], lithiumsulfur batteries (LSBs)[13] or other secondary battery systems[14,15,16,17,18,19], solar rechargeable battery (SRB) systems can achieve an efficient photocharging mode and high specific energy[20,21]; they have inferior power performance.
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