Electrocatalysis of the hydrogen evolution reaction (HER) is a vital and demanding, yet challenging, task to produce clean energy applications. Here, the RuRh2 bimetallene nanoring with rich structural defects is designed and successfully synthesized by a mixed‐solvent strategy, displaying ascendant HER performance with high mass activity at −0.05 and −0.07 V, separately higher than that of the commercial Pt catalyst. Also, it maintains steady hydrogen bubble evolution even after 30 000 potential cycles in acid media. Furthermore, the RuRh2 bimetallene nanoring shows an outstanding activity in both alkaline and neutral media, outperforming that of Pt catalysts and other reported HER catalysts. A combination of atomic‐scale structure observation and density functional theory calculations demonstrates that both the grain boundaries and symmetry breaking of RuRh2 bimetallene cannot only weaken the adsorption strength of atomic hydrogen, but also facilitate the transfer of electrons and the adsorption of reactants, further boosting the HER electrocatalytic performance in all pH values.

The inter-diffusion of Cu2+ cations into CuS nanocrystals generates CuS@Cu2−xS core–shell and Cu2S NCs in the presence of ascorbic acid (AA) at varying precursor Cu2+ : Cu+ molar ratios. The inter-diffusion process has a confining effect on the microwave absorption properties.

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Generating aqueous soluble covellite CuS nanocrystals with well-defined NIR plasmon absorbance by reacting Cu2+ with S2− ions via a facile and scalable protocol at room temperature, in the presence of various ligands.

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