Long afterglow materials can store and release light energy after illumination. A brick‐like, micrometer‐sized Sr2MgSi2O7:Eu2+,Dy3+ long‐afterglow material is used for hydrogen production by the photocatalytic reforming of methanol under round‐the‐clock conditions for the first time, achieving a solar‐to‐hydrogen (STH) conversion efficiency of 5.18 %. This material is one of the most efficient photocatalysts and provides the possibility of practical use on a large scale. Its remarkable photocatalytic activity is attributed to its unique carrier migration path and large number of lattice defects. These findings expand the application scope of long afterglow materials and provide a new strategy to design efficient photocatalysts by constructing trap levels that can prolong carrier lifetimes.

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Ionic liquids have attracted much attention in past decade for their unique properties. The density is an important property in industrial application, however the density data are relatively scarce compared with the great number of ILs. The quantitative structure property relationship (QSPR) and group contribution method (GCM) have been used for predicting ILs density. However, the accuracy of QSPR is not as good as that of GCM. In this work, a desirable QSPR model was developed to estimate ILs density. The general topological indexes (TIs) proposed by our research group were used to develop the QSPR model, which was on the basis of 5948 experimental data points for 188 ILs. The collected data are in the range of temperature (253.15−473.15) K and pressure (0.1−250) MPa. The correlation coefficient (R 2 ) and the overall average absolute deviation are 0.998 and 0.422 %, respectively.

Strontium Titanate has a typical perovskite structure with advantages of low cost and photochemical stability. However, the wide bandgap and rapid recombination of electrons and holes limited its application in photocatalysis. In this work, a SrTiO3 material with surface oxygen vacancies was synthesized via carbon reduction under a high temperature. It was successfully applied for photocatalytic overall water splitting to produce clean hydrogen energy under visible light irradiation without any sacrificial reagent for the first time. The photocatalytic overall water splitting ability of the as-prepared SrTiO3-C950 is attributed to the surface oxygen vacancies that can make suitable energy levels for visible light response, improving the separation and transfer efficiency of photogenerated carriers.

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