A novel three-dimensional (3D) superstructure of cobalt hydroxide carbonate assembled from nanoneedles has been synthesized via a facile hydrothermal method. Furthermore, we tested the electrocatalytic oxygen evolution reaction performance, which demonstrated that the superstructure exhibited high catalytic activity, achieving 10 mA cm at a low overpotential of merely 240 mV.

This is a repository copy of Facile route to bulk ultrafine-grain steels for high strength and ductility.

Well-defined second-generation hot spots in end-to-end assembled gold nanobipyramids exhibit sufficient enhancement of the plasmonic field for single molecule detection.

Interfacial oxygen vacancy layer of BCN–TiO2 heterostructures as an effective interfacial mediator can promotes the direct Z-scheme charge carrier transfer process and visible light photocatalytic activity for H2 evolution.

Negative thermal expansion (NTE) is an intriguing property for not only fundamental studies but also technological applications. However, few NTE materials are available compared with the huge amount of positive thermal expansion materials. The discovery of new NTE materials remains challenging. Here we report a chemical modification strategy to transform thermal expansion from positive to negative in cubic magnetic compounds of (Zr,Nb)­Fe2 by tuning the magnetic exchange interaction. Furthermore, an isotropic zero thermal expansion can be established in Zr0.8Nb0.2Fe2 (αl = 1.4 × 10–6 K–1, 3–470 K) over a broad temperature range that is even wider than that of the prototype Invar alloy of Fe0.64Ni0.36. The NTE of (Zr,Nb)­Fe2 is originated from the weakened magnetic exchange interaction and the increased d electrons of Fe by the Nb chemical substitution, so that the magnetovolume effect overwhelms the contribution of anharmonic lattice vibration.