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Bioadhesives are of great interest for tissue/wound closure to reduce surgical time, minimize treatment invasiveness, and prevent body fluid leakage.

Rechargeable zinc–air batteries (ZAB) with solid‐state electrolyte are a potential power source for flexible electronic devices. However, solid electrolytes for the battery at large currents remain a challenge in bubble removal at the electrode surface and the small contact area of the electrolyte–electrode interface, as well as low conductivity itself. Herein, a three‐electrode structure is proposed for the solid‐state rechargeable ZAB, where the sodium polyacrylate (PAA‐Na) hydrogel serving as the electrolyte exhibits good mechanical properties, excellent water retention ability, and high conductivity (0.19 S cm−1) after being soaked in potassium hydroxide and zinc acetate solution. The zinc electrode of porous structure is sandwiched by the electrolyte on both sides, facilitating ion transport during charge/discharge. MnO2/C, as the catalyst of the air electrode, is in contact with the hydrogel, increasing the catalyst active area. Nickel mesh is the charging electrode which facilitates the removal of the evolved bubbles. The results demonstrate that rechargeable ZAB with the PAA‐Na hydrogel electrolyte can release a maximum power density of 100.7 mW cm−2 and run for 183 cycles at a current density of 10 mA cm−2, which can be a strong competitor in the flexible energy‐storage field.

Biomineralization is the process by which organisms form mineralized tissues with hierarchical structures and excellent properties, including the bones and teeth in vertebrates. The underlying mechanisms and pathways of biomineralization provide inspiration for designing and constructing materials to repair hard tissues. In particular, the formation processes of minerals can be partly replicated by utilizing bioinspired artificial materials to mimic the functions of biomolecules or stabilize intermediate mineral phases involved in biomineralization. Here, we review recent advances in biomineralization-inspired materials developed for hard tissue repair. Biomineralization-inspired materials are categorized into different types based on their specific applications, which include bone repair, dentin remineralization, and enamel remineralization. Finally, the advantages and limitations of these materials are summarized, and several perspectives on future directions are discussed.

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Conventional orthopedic/dental implants can trigger foreign body reactions and are vulnerable to biocontamination because of the lack of suitable surface functions from natural biointerfaces, which may lead to inflammation, infection, and subsequent poor osseointegration and implant failure. Instead of attempting to synthetically replicate the sophisticated biointerface properties, directly utilizing natural cell membranes to bestow implant surfaces with integrated functions is a promising strategy to avoid implant failure. This study presents a facile general strategy for fabricating a controllable (patterned) and bioactive cell membrane-based coating for orthopedic/dental implants at the macroscopic level by leveraging a polyphenol layer (poly­(tannic acid)) as an intermediate to bind the cell membranes to the implant surface. The poly­(tannic acid) layer provides significant immobilization and stability for the cell membrane layer on the implant surface. This homogeneous cell membrane-based coating presents excellent antibiofouling capabilities, which can effectively prevent the nonspecific adsorption of model proteins (bovine serum albumin, fibrinogen, and lysozyme) and bacteria (Escherichia coli and Staphylococcus aureus). Additionally, it exhibits excellent biocompatibility and macrophage immunoregulatory capacity and can potentially decrease the risk of implant infection. This technique can be applied to diverse cell types and implants for better implant integration because of the high cell affinity of polyphenols.