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Constructing nanolaminate structures with covalent bridges for high-performance photo-assisted Zn-ion storage
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DOI：10.1016/j.nanoms.2026.06.007.png)
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Abstract
En 中文
Photo-assisted rechargeable zinc-ion batteries (PAZIBs) have received extensive attention due to their promising performance under illumination. However, the development of highly efficient photocathodes for PAZIBs, with high capacity and durability, remains a significant challenge. Herein, we construct a nanolaminate MnO2/polypyrrole stack (PPy-MnO2) through an in situ polymerization technique, which is used to boost the overall performance of PAZIBs. Through density-functional theory (DFT) calculations, we verify that the intercalation of the PPy polymer chains within δ-MnO2 interlayers can help in expanding the interlayer spacing and facilitating the Zn2+ insertion. Furthermore, we discover that the in situ polymerization pathway induces oxygen vacancies in the δ-MnO2 layers, which enables the direct bonding between the bare Mn and N from pyrrolic rings, resulting in twisted polymer steric structures in the nanolaminates. This further expands the interlayer spacing, provides additional Zn2+ interactions, generating additional electron pathways, and optimizes the bandgap structures. Therefore, PAZIBs with PPy-MnO2 nanolaminates display high specific capacities (523 mAh g−1 under illumination vs. 318 mAh g−1 under dark conditions) and excellent cycling behavior (95.7% after 1500 cycles). This work opens up new avenues for designing efficient and environmentally friendly photoelectrode materials for advanced energy storage applications.
Keywords:
Photo-assisted
Zinc-ion battery
PPy-MnO2
Nanolaminate
Electron reorganization
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