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A low concentration eutectic electrolyte (LCEE) proposed by using N-methyl-2-pyrrolidone (NMP) additive delivered superior cycling ability and excellent compatibility in coin cell and pouch cell prototypes.

To tackle the crisis of fossil energy shortage and global warming, exploring a series of efficient, portable devices for the conversion/storage of clean and renewable energy sources has remained a significant topic. Supercapacitors as an advanced energy storage device have the properties of portability and stable performance, electrode materials especially flexible electrode materials as important components of supercapacitors have drawn great attention in various emerging fields such as portable, wearable electronics and memory materials. Based on high aspect ratios, specific surface areas, porosity, mechanical properties and excellent flexibility, natural polysaccharide cellulose and its derivatives have become promising building polymers for flexible electrode materials. In view of poor electrical conductivity and low areal capacitance, the compound modification of cellulose flexible materials and the corresponding application in flexible electrodes are reviewed. To further illustrate their versatile properties and performances, cellulose-based flexible electrolytes and membranes are summarized with detailed examples. Overall, this review covers recent advances regarding cellulose-based flexible materials for different components including electrodes, electrolytes and membranes used in supercapacitors and expects to provide references for further research of this promising material.

In this study, carbon dot-sensitized Ti3+ self-doped TiO2 dual-phase (TiO2−x/CDs) composite photocatalytic systems were successfully constructed using a low-temperature hydrothermal method. The TiO2−x photocatalyst showed improved photocatalytic activities for the removal of Cr6+ and RhB under visible light. Remarkably, RhB (10 mg L−1) and Cr6+ (40 mg L−1) solutions were degraded completely in 30 and 120 min, respectively, by the composite photocatalyst (1 g L−1) under visible-light irradiation. These results were much better than those of commercial P25. This fascinating photocatalytic performance was attributed to the improved photogenerated electron–hole separation efficiency from the synergistic effects of rutile and anatase, and the reduced photogenerated charge carrier recombination and facilitated visible-light absorption from the introduced CDs. This study provides a promising approach for the treatment of real wastewater using sunlight.