Self‐sacrifice: Poly(acrylic acid) was used to tune the diameter of 1D nanowires prepared from linear Cd2+/thioglycolic acid coordination polymer chains. The nanowires were then employed as sacrificial templates for preparing long CdTe nanotubes of different diameters (see the TEM images).

Flexible energy-storage devices based on supercapacitors rely largely on the scrupulous design of flexible electrodes with both good electrochemical performance and high mechanical properties. Here, nitrogen-doped carbon nanofiber networks/reduced graphene oxide/bacterial cellulose (N-CNFs/RGO/BC) freestanding paper is first designed as a high-performance, mechanically tough, and bendable electrode for a supercapacitor. The BC is exploited as both a supporting substrate for a large mass loading of 8 mg cm and a biomass precursor for N-CNFs by pyrolysis. The one-step carbonization treatment not only fabricates the nitrogen-doped three-dimensional (3D) nanostructured carbon composite materials but also forms the reduction of the GO sheets at the same time. The fabricated paper electrode exhibits an ultrahigh areal capacitance of 2106 mF cm (263 F g) in a KOH electrolyte and 2544 mF cm (318 F g) in a HSO electrolyte, exceptional cycling stability (∼100% retention after 20000 cycles), and excellent tensile strength (40.7 MPa). The symmetric supercapacitor shows a high areal capacitance (810 mF cm in KOH and 920 mF cm in HSO) and thus delivers a high energy density (0.11 mWh cm in KOH and 0.29 mWh cm in HSO) and a maximum power density (27 mW cm in KOH and 37.5 mW cm in HSO). This work shows that the new procedure is a powerful and promising way to design flexible and freestanding supercapacitor electrodes.

The Lewis acidic sites and reducing power of a photocatalyst are critical for its performance in CO2 activation for cycloadditions. In this study, we designed and synthesized a Ti18Bi4O29Bz26 (Bz = benzoate) cluster molecule that contains Lewis acidic sites on the surface and combines Ti18O22 and Bi4O7 cluster counterparts. DFT calculations combined with synchronous illumination X-ray photoelectron spectroscopy reveal that the Ti18O22 and Bi4O7 components form an S-scheme heterojunction, significantly increasing the reducing power of photogenerated electrons and spatial separation of photogenerated charges. While Ti18Bi4O29Bz26 has some catalytic activity in the cycloaddition reaction between CO2 and epoxides at room temperature, light irradiation significantly increases both the conversion rate and the selectivity of the cyclocarbonate product. Mechanistic studies show that both electrons and holes contribute to the improved performance when exposed to light, and that the increased reducing power overcomes the cycloaddition reaction’s limiting stepCO2 reductive activation. This is not only the report on photocatalytic cycloaddition of CO2 using a Lewis acidic titanium-oxide cluster but also the example of the molecular S-scheme heterojunction to the best of our knowledge.

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