【摘 要】
：
Hydrogel electrolytes with anti-freezing properties are crucial for flexible quasi-solid-state supercapacitors operating at low temperatures.However,the electrolyte freezing and sluggish ion migration caused by the cold temperature inevitably damage the f
【机 构】
：
MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage,School of
论文部分内容阅读
Hydrogel electrolytes with anti-freezing properties are crucial for flexible quasi-solid-state supercapacitors operating at low temperatures.However,the electrolyte freezing and sluggish ion migration caused by the cold temperature inevitably damage the flexibility and electrochemical properties of supercapacitors.Herein,we introduce the concentrated electrolyte into a freeze-casted poly(vinyl alcohol) hydrogel film not only reducing the freezing point of the electrolyte (-51.14 ℃) in gels for ensuring the flexibility,but also improving the ionic conductivity of the hydrogel electrolyte (5.92 mS cm-1 at-40 ℃) at low tem-peratures.As a proof,an all-in-one supercapacitor,synthesized by the one-step polymerization method,exhibits a good specific capacitance of 278.6 mF cm-2 at-40 ℃(accounting for 93.8％ of the capacitance at room temperature),high rate performance(50％ retention under the 100-fold increase in current densities),and long cycle life (88.9％ retention after 8,000 cycles at-40 ℃),representing an excellent low-temperature performance.Our results provide a fresh insight into the hydrogel electrolyte design for flexible energy storage devices operating in the wide range of temperature and open up an exciting direction for improving all-in-one supercapacitors.
其他文献
The development of nanomedicine systems for applications in cancer therapies has been widely explored in the last decade.With inherent biocompatibility,nanomedicine devices derived from biological membranes have shown many unique advantages compared with
Carbon nanohoop,a class of constrained molecular architecture consisting of linked arene units,has attracted considerable interest from both experimental and theoretical chemists due to its synthetic challenge and aesthetic architectures.Another fascinati
Ultralong organic room-temperature phosphorescence (RTP) materials have attracted tremendous attention recently due to their diverse applications.Several ultralong organic RTP materials mimicking the host-guest architecture of inorganic systems have been
The design of efficient iron-based catalysts remains a great challenge for selective cyclohexane oxidation to cyclohexanone under mild conditions.Because of the complex distribution of iron location on the support,the selectivity is always low.Here,we rep
The regulated crystallization of perovskite and highly repeatable preparation are decisive challenges for large-scale flexible perovskite solar cells (PSCs).Herein,we synthesize an oil-soluble poly(3,4-ethylenedioxythiophene) (Oil-PEDOT) as a hole transpo
Photodynamic therapy (PDT),a light triggered therapeutic mode,has been recognized as an attractive treatment for oncotherapy.The phototoxicity to normal tissues during treatment limited the development of PDT owing to the always “on” properties of photose
Electrochromic transition metal oxides (ETMOs) are useful in energy saving devices and smart indicators.Among these ETMO candidates,titanium dioxide (TiO2) is intriguing for its abundance and environmental safety,but the low color efficiency and slow colo
Monomer sequence influences the properties and applications of polymers.Consequently,massive efforts have been made to implement sequence control of polymers.In this work,we developed a computer-aided droplet-flow polymerization based on photo-controlled
An N-heterocyclic carbene (NHC)-catalyzed enantioselective Mannich reaction of the remote 7-carbon of cyclopro-pylcarbaldehydes is disclosed for the first time.Diastereo-and enantiomerically enriched multicyclic δ-lactam compound is afforded as the main p
As an emerging type of important macrocycles for supramolecular chemistry,pillararenes and their derivatives have been widely studied and applied in numerous fields,which intensively promotes the development of chemistry,materials science and biology.Pill