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Conjugated polymer modification is one of the most promising methods for preparing TiO2-based visible-light-responsive photocatalysts. In this article, TiO2 nanoparticles modified by conjugated derivatives of polyisoprene (CDPIP) were prepared from TiO2/polyisoprene nanocomposites by the bromine addition reaction of polyisoprene and dehydrobromination reaction of the brominated polyisoprene. The visible light photocatalytic activities of as-prepared nanocomposites were evaluated using methyl orange as the model contaminant and two indoor fluorescent lamps with a 400 nm cutoff filter as the visible light source. TEM images show that a layer of CDPIP attaches on the surface of TiO2 nanoparticles. XPS, FTIR, and Raman spectra further reveal the conjugated structure of CDPIP. The results of XRD, UV–vis DRS, and PL spectra show that modification of CDPIP does not change the crystalline structure of TiO2, greatly improves the absorbance of the nanocomposites in the whole range of visible light, and obviously reduces the recombination probability of photogenerated electrons and holes. The photocatalytic experiments reveal that the CDPIP-modified TiO2 nanocomposites exhibit significantly higher photocatalytic activity than that of TiO2 (P-25) under visible light irradiation.

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Hybrid supercapacitors are considered the next-generation energy storage equipment due to their superior performance. In hybrid supercapacitors, battery electrodes need to have large absolute capacities while displaying high cycling stability. However, enhancing areal capacity via decreasing the size of electrode materials results in reductions in cycling stability. To balance the capacity–stability trade-off, rationally designed proper electrode structures are in urgent need and still of great challenge. Here we report a high-capacity and high cycling stability electrode material by developing a nickel phosphate lamination structure with ultrathin nanosheets as building blocks. The nickel phosphate lamination electrode material exhibits a large specific capacity of 473.9 C g–1 (131.6 mAh g–1, 1053 F g–1) at 2.0 A g–1 and only about 21% capacity loss at 15 A g–1 (375 C g–1, 104.2 mAh g–1, 833.3 F g–1) in 6.0 M KOH. Furthermore, hybrid supercapacitors are constructed with nickel phosphate lamination and activated carbon (AC), possessing high energy density (42.1 Wh kg–1 at 160 W kg–1) as well as long cycle life (almost 100% capacity retention after 1000 cycles and 94% retention after 8000 cycles). The electrochemical performance of the nickel phosphate lamination structure not only is commensurate with the nanostructure or ultrathin materials carefully designed in supercapacitors but also has a longer cycling lifespan than them. The encouraging results show the great potential of this material for energy storage device applications.