Solar energy, although it has the highest power density available in terms of renewable energy, has the drawback of being erratic. Integrating an energy harvesting and storage device into photovoltaic energy storage modules is a viable route for obtaining self-powered energy systems. Herein, an MXene-based all-solution processed semitransparent flexible photovoltaic supercapacitor (PSC) was fabricated by integrating a flexible organic photovoltaic (OPV) with Ti 3 C 2 T x MXene as the electrode and transparent MXene supercapacitors with an organic ionogel as the electrolyte in the vertical direction, using Ti 3 C 2 T x thin film as a common electrode. In the quest for a semitransparent flexible PSC, Ti 3 C 2 T x MXene was first used as a transparent electrode for OPV with a high power conversion efficiency of 13.6%. The ionogel electrolyte-based transparent MXene supercapacitor shows a high volumetric capacitance of 502 F cm À3 and excellent stability. Finally, a flexible PSC with a high average transmittance of over 33.5% was successfully constructed by allsolution processing and a remarkable storage efficiency of 88% was achieved. This strategy enables a simple route for fabricating MXene based high-performance all-solution-processed flexible PSCs, which is important for realizing flexible and printable electronics for future technologies.
Intracellular lipid
metabolism occurs in lipid droplets (LDs),
which is critical to the survival of cells. Imaging LDs is an intuitive
way to understand their physiology in live cells. However, this is
limited by the availability of specific probes that can properly visualize
LDs in vivo. Here, an LDs-specific red-emitting probe is proposed
to address this need, which is not merely with an ultrahigh signal-to-noise
(S/N) ratio and a large Stokes shift (up to 214 nm) but also with
superior resistance to photobleaching. The probe has been successfully
applied to real-time tracking of intracellular LDs behaviors, including
fusion, migration, and lipophagy processes. We deem that the proposed
probe here offers a new possibility for deeper understanding of LDs-associated
behaviors, elucidation of their roles and mechanisms in cellular metabolism,
and determination of the transition between adaptive lipid storage
and lipotoxicity as well.
Restricted by the
energy gap rule, near-infrared (NIR) luminescent
materials face great challenges. Here, we report a newly designed
and synthesized organic molecule, 5,5′-([1,2,5]thiadiazolo[3,4-c]pyridine-4,7-diyl)bis(N,N-diphenylthiophen-2-amine) (DTPS-PT), which has strong donor and
acceptor interactions for NIR emission applications. The results demonstrate
that the higher planarity of the DTPS-PT molecular structure enhances
the pi-conjugation and hybridization between the charge transfer state
(CT) and localized pi states (LE). As a result, DTPS-PT exhibits NIR
emissions from an LE involved in hybridized local and charge transfer
(HLCT) states, showing a 79% high fluorescence quantum yield in the
low polar solvent tetrachloromethane. For both doped and nondoped
devices, the NIR OLEDs based on DTPS-PT achieved “real”
NIR emission with the λonset above 700 nm. The best
performing OLED device within the doped devices gave a maximum emission
peak around 840 nm with a maximum radiance of 2202 mW Sr–1 m–2.
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