The photocatalytic splitting of water is an attractive, environmentally friendly method that offers a way of capturing available solar energy and converting it into valuable hydrogen. [ 1 ] In the past few decades, although various efforts have been made to improve the photocatalytic activities of the photocatalysts, only a few effective photocatalysts for H 2 production under visible-light irradiation have been reported. [2][3][4][5][6][7] Therefore, it is desirable to seek novel visible-light photocatalysts with high effi ciency for energy conversion. In recent years, sulfi de solid solutions, such as ZnS-AgInS 2 , [ 8 ] ZnS-CuInS 2 , [ 9 ] and ZnSAgInS 2 -CuInS 2 , [ 10 ] have been extensively studied because of their controllable band structures and excellent performance for photocatalytic hydrogen production under visible light irradiation. However, a high-temperature heat treatment is needed for the preparation of these solid solutions and expensive noble metals need to be loaded on the surface as co-catalysts in order to improve their photocatalytic effi ciency.Porous inorganic materials have also received a great deal of interest because of their wide range of applications in the fi elds of catalysis, [ 11 , 12 ] solar cells, [ 13 ] supercapacitors, [ 14 ] and gas sensors. [ 15 ] For photocatalysts with a nanoporous structure e − /h + recombination in the bulk is reduced and, moreover, a quicker surface e − /h + separation, faster interfacial charge-carrier transfer, and better charge-carrier trapping are achieved. [ 16 ] Therefore, nanoporous photocatalysts are capable of exhibiting a high activity for H 2 evolution under visible-light irradiation. In our previous work, [ 17 ] hierarchically assembled porous ZnS-In 2 S 3 -Ag 2 S solid solutions showed relatively high activities for photocatalytic H 2 evolution under visible-light irradiation ( λ > 400 nm) even in the absence of co-catalysts. This result implies that the preparation of porous sulfi de solid solutions may provide a new pathway to designing and fabricating novel photocatalyst materials with high activities under visiblelight irradiation.The self-assembly of nanoparticles into three-dimensional (3D) hierarchical superstructures is a well-known route for fabricating porous materials. [ 18 , 19 ] Binary II-VI nanocrystals [20][21][22][23][24][25][26][27][28][29][30] and polynary chalcogenides [31][32][33][34][35][36] have been intensively studied owing to their unique structures and enhanced performances in various applications. However, very limited successes have been achieved on the fabrication of complex ZnS solid-solution hierarchitectures (hierarchical architectures) with a nanoporous structure. Therefore, the preparation of ZnS solid solutions with novel hierarchitectures is attractive because unique properties might be derived from their special morphologies. Moreover, it is important to explore the underlying mechanism by which the complex nanostructures are assembled from the primary species because a good understanding of the proc...

Coexistence of negative differential resistance (NDR) and resistive switching (RS) memory is observed using a Ag|TiOx|F‐doped‐SnO2 memory cell at room temperature. Unlike other reports, the coexistence of NDR and RS strongly depends on the relative humidity levels at room temperature. The NDR disappears when the cells are placed in a dry air ambient (H2O < 5 ppm) or in vacuum, but the coexistence emerges and gradually becomes obvious after the cells are exposed to ambient air with relative humidity of 35%, and then becomes dramatically enhanced as the relative humidity becomes higher. Due to the excellent stability and reversibility of the coexistence of NDR and RS, a multilevel RS memory is developed at room temperature. Hydroxide ion (OH−) is induced by gas‐phase water‐molecule splitting on the surface and interface of the memory cell. The OH− interacts with oxygen vacancies and transports in the bulk of memory cell to facilitate the migration of Ag ions and oxygen vacancies along grain boundaries. These processes are responsible for the moisture‐modulated and room‐temperature coexistence. This work demonstrates moisture‐modulated coexistence of NDR and RS for the first time and gives an insight into the influence of water molecules on transition‐metal‐oxide‐based RS memory systems.

The discovery of natural adhesion phenomena and mechanisms has advanced the development of a new generation of tissue adhesives in recent decades. In this study, we develop a natural biological adhesive from snail mucus gel, which consists a network of positively charged protein and polyanionic glycosaminoglycan. The malleable bulk adhesive matrix can adhere to wet tissue through multiple interactions. The biomaterial exhibits excellent haemostatic activity, biocompatibility and biodegradability, and it is effective in accelerating the healing of full-thickness skin wounds in both normal and diabetic male rats. Further mechanistic study shows it effectively promotes the polarization of macrophages towards the anti-inflammatory phenotype, alleviates inflammation in chronic wounds, and significantly improves epithelial regeneration and angiogenesis. Its abundant heparin-like glycosaminoglycan component is the main active ingredient. These findings provide theoretical and material insights into bio-inspired tissue adhesives and bioengineered scaffold designs.

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