![]() ![]() As a result, the Li-ions are reduced at the anode to form Li-metal, resulting in photocharging. Simultaneously, photoholes present in Fe 2O 3 oxidize Fe 0 to Fe 3+ which provides repulsion to the Li + toward the Li-metal anode via the electrolyte. The conductive additives provide a favorable pathway for photoelectrons to reach the current collector and further the anode through an external circuit. When the PRB is exposed to light, Fe 2O 3 nanorods absorb photons of energy higher than their energy band gap and generate photogenerated charge carriers at the photocathode. Under white light LED illumination at a high current rate of 2,000 mA g -1, the PRB showed a 92.96% enhancement in specific capacities. The PRB showed independent charging when illuminated with a 470 nm blue LED, achieving a photoconversion and storage efficiency (PCSE) of 1.988%, which is a significant achievement in the field of PRBs compared to the earlier published results based on the intercalation-based ion storage. Shahab Ahmad (right) along with the PhD student Mr. ![]() ![]() Hematite can absorb sunlight and produce photogenerated charge carriers, while PCBM and carbon nanotubes conductive additives provided a suitable pathway for photogenerated electrons to reach the current collector and initiate photocharging," said Shubham Chamola, the first author of the research article.ĭr. "The highly nanoporous photocathodes are fabricated using hematite, C-61 carbon (PCBM) and carbon nanotubes. This work provides the first demonstration of standalone photocharging by exploring the conversion reaction mechanism where more than 90% enhancement in the specific capacity of the lithium-ion battery is achieved upon solar illumination. The iron oxide nanorods have shown the capability to simultaneously harvest the solar radiation in the visible region due to their bandgap of ~2.1 eV and store the Li-ions efficiently. The high theoretical specific capacity (1006 mAh g -1), earth abundance, nontoxicity, environmental friendliness and low processing techniques make the alpha phase of iron oxide an attractive anode material for lithium-ion batteries. In their study published in Advanced Sustainable Systems, researchers at the Advanced Energy Materials Lab, Department of Physics at the Indian Institute of Technology Jodhpur have demonstrated that iron oxide (also known as hematite) nanorods can work as an active material to form efficient and low-cost photocathodes for PRB applications. Light-induced conversion mechanism for PRBs This cutting-edge technology promises to be lightweight and efficient compared to the existing conventional combination of PVs and batteries. A PRB can perform solar energy harvesting and storage simultaneously in a single device using advanced nanomaterials, which can perform energy harvesting and storage efficiently. In this context, the demonstrated photorechargeable batteries (PRBs) can provide a promising solution to overcome the limitations associated with the physical integration of PVs and batteries. As a result, these issues limit applications. Moreover, these physically connected photovoltaic (PV) panels and batteries make use of different types of energy materials to achieve both energy harvesting and storage, which makes the overall system bulky. ![]()
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