A magnetically separable adsorbent, anhydride-functionalized Fe3O4@SiO2@PEI-NTDA, was successfully constructed for removal of heavy metal ions from aqueous solution.

Aqueous zinc-ion batteries (ZIBs) have been considered as safe and scalable energy storage solutions, but the dendrite and corrosion issues of Zn anodes have hindered their further application. Herein, we demonstrate that two-dimensional metalorganic framework (MOF) nanosheets can act as protective coatings to prevent dendrite formation and hydrogen evolution of Zn anodes. The morphology of MOFs was tuned from octahedral nanoparticles (UiO-67-3D) to nanosheets (UiO-67-2D), leading to significantly enhanced protective performance. UiO-67-2D nanosheets-coated Zn anodes displayed smaller polarization, longer cycling lifetime and lower H 2 evolution than those of UiO-67-3D nanoparticles in symmetrical cells, which has been attributed to the higher concentration of surface Zr-OH/H 2 O to induce uniform Zn deposition and one-dimensional (1D) channels perpendicular to the Zn surface to regulate Zn 2+ diffusion. The assembled UiO-67-2D@Zn||Mn 2 O 3 /C full cell shows a high capacity of 240 mAh g −1 at 1 A g −1 and excellent cycling stability.

The optimal therapy effect of tumors is frequently restricted by the dense extracellular matrix (ECM) and anoxia. Herein, an intelligent BPNs-Arg-GOx@MnO2 (BAGM) nanozyme is innovatively designed as a multimodal synergistic therapeutic paradigm that possesses both nitric oxide (NO) self-supplying and ECM degradation properties to reinforce the therapy effect by a tumor microenvironment (TME)-activatable cyclic cascade catalytic reaction. This theranostic nanoplatform is constructed by using polyethyleneimine-modified black phosphorus nanosheets as a “fishnet” to attach l-Arginine (l-Arg) and glucose oxidase (GOx) and then depositing mini-sized MnO2 nanosheets (MNs) on the surface by a facile situ biomineralization method. As an intelligent “switch”, the MNs can effectively trigger the cascade reaction by disintegrating intracellular H2O2 to release O2. Then, the conjugated GOx can utilize O2 production to catalyze intracellular glucose to generate H2O2, which not only starves the tumor cells but also promotes oxidation of l-Arg to NO. Thereafter, matrix metalloproteinases will be activated by NO production to degrade the dense ECM and transform matrix collagen into a loose state. In turn, a loose ECM can enhance the accumulation of the BAGM nanozyme and thereby reinforce synergistic photothermal therapy/starvation therapy/NO gas therapy. Both in vitro and in vivo results indicate that the TME-tunable BAGM therapeutic nanoplatform with cascade anticancer property and satisfactory biosecurity shows potential in nanomedicine.

Zn is a promising anode for aqueous energy storage owing to it intrinsic superior properties such as large capacity, abundant reserves, low potential and safety. But, the growth of dendrites during charge and discharge leads to a decrease in reversibility. In addition, further development of zinc‐ion hybrid capacitors (ZICs) is seriously challenging because of the lack of an exceptional cathode. Herein, we use ZIF‐8 annealed at 500 °C (annealed ZIF‐8) as a host material for stable and dendrite‐free Zn anodes. Utilization of annealed ZIF‐8 results in dendrite‐free Zn deposition and stripping as a result of its porous construction, which contains trace Zn. Furthermore, we firstly proposed innovative N,O dual‐doped carbon which was designed by the derived ZIF‐8 (ZIF‐8 derived C) as cathode for high‐energy and power‐density ZICs. The new ZIC assembled by Zn@annealed ZIF‐8 anode and ZIF‐8 derived C cathode provides a capacity of 135.5 mAh g−1 and an energy density of 108.4 Wh kg−1 with a power density of 800 W kg−1 at 1.0 A g−1. In addition, it shows outstanding cycling stability of 91% capacity retention after 6000 cycles at 5.0 A g−1. Moreover, the solid‐state ZICs can drive LEDs and smart watches. This ZIC holds promise for the practical application of supercapacitors.

Urgent requests for environmentally friendly clean energy and the development of modern electronic products have resulted in fervent research on novel energy storage technologies, particularly for supercapacitors. But supercapacitors suffer from low energy densities, restricting their development. In order to obtain high performance supercapacitors with a high energy density and power density, the indispensable factor is designing electrode materials with excellent capacitive performance. We have successfully prepared innovative materials and unique structures to apply in high-performance supercapacitors. The nanowire is good for making close contact with the electrolyte for fast ion diffusion, and the nanoflower sheet enables shortening the electron convey route and provides a number of reaction active sites. Herein, we use copper foam (CF) as the substrate, and binder-free core–shell nanoflower-like CuO/CF@NiCoMn–OH is designed as a battery-style positive electrode. Benefiting from the advantages of a metal–organic framework (MOF)-assisted growth strategy and simple hydrothermal dynamics, the prepared optimizing electrode structure delivers a distinguished specific capacity of 26.8 F cm–2 at 8 mA cm–2 (3356 F g–1 at 1 A g–1). The assembled CuO/CF@NiCoMn–OH//AC exhibits a high energy density of 37.28 W h kg–1 and a power density of 170 W kg–1, under a potential window of 1.5 V. This work implies that MOF-assisted construction of core–shell nanoflower-like CuO/CF@NiCoMn–OH has broad application prospects in high-performance energy storage equipment.