Nanoindentation on peeled high-performance polymeric fibers reveals failure mechanisms
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lectrification of remote areas needs low-cost, off-grid power systems. Solar flow battery (SFB) technology is one such option. However, obtaining both high energy-conversion efficiency and long device lifetime simultaneously for SFB systems has been a challenge. Work by Anita Ho-Baillie, Song Jin, and co-workers, reported in Nature Materials (doi:10.1038/s41563-020-0720-x), showed that a combination of highefficiency (FAPbI3)0.83(MAPbBr3)0.17 perovskite/silicon tandem solar cell and redox batteries based on bis-
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nowledge of the electronic energy landscape of an electronic material is important for the optimization of its optoelectronic properties, as well as its application in devices. Formamidinium lead triiodide (FAPbI3), a three-dimensional electronic material, shows an intriguing quantum confinement effect, as reported by Laura Herz from the University of Oxford and co-workers in Nature Materials (doi:10.1038/ s41563-020-0774-9). The authors used
Nanoindentation on peeled highperformance polymeric fibers reveals failure mechanisms
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igh-performance fibers are key to many structural and lightweight applications as they are the main reinforcing components of continuous fiber-reinforced composites and fabrics. These fibers are drawn from synthetic polymers such as poly(p-phenylene terephthalamide) (PpPTA) or ultrahigh-molecular-weight polyethylene (UHMWPE). During the drawing process, highly oriented and crystalline nanofibrils of 10–50 nm width form and assemble into larger bundles of 100–500 nm width, thereby creating a hierarchical microstructure. Although it is known that hierarchy generally improves the properties of materials, its role in the failure of synthetic fibers has not been studied. In particular, measuring properties at
(trimethylammonio)propyl viologen (BTMAP-Vi) and 4-trimethylammonium-TEMPO (NMe-TEMPO) redox couples can provide a high-performance solar flow battery. The authors have used numerical methods for the rational design of components to achieve an optimal match between the maximum power point voltage (VMPP) of the solar cell and formal cell potential (E 0cell ) of the redox flow battery. The authors achieved 20.1% solar to output electricity efficiency. This perovskite on a Si tandem cell is
compatible with aqueous organic SFBs while being cost-effective. The Si bottom cell with a gold back-contact comes in contact with the aqueous electrolyte. The performance of the photo-electrode (i.e., the tandem cell with the electrolyte) is similar to the performance of a solid-state tandem solar cell, indicating the compatibility of the tandem cell and electrolytes for flow battery applications. The conceptual design in this work could help in future optimization for storage systems with integrated solar conversion ability.
temperature-dependent absorption spectroscopy and ab initio simulations to confirm the presence of an intrinsic quantum confinement in the nominally bulk semiconductor FAPbI3. They attribute this quantum confinement with a length scale of 10–20 nm to the coexistence
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