Exploring the high activity and stability of HER electrocatalysts in alkaline media is highly desirable. In this paper, a facile hydrothermal method is proposed for synthesizing the Ru decorated graphite carbon nitride/reduced graphene oxide (Ru‐CN‐rGO), which can be used as efficient electrocatalysts in alkaline media. The optimal Ru‐CN‐rGO (Ru: 4.4 wt%) exhibits enhanced electrocatalytic activity than these of Ru/C and Pt/C, which requires a low overpotential (45 mV) to derive a current density of 10 mA cm−2, a small Tafel slope (40.0 mV dec−1) and a large exchange current density (1.13 mA cm−2). More importantly, the obtained Ru‐CN‐rGO exhibits the long‐term stability in alkaline electrolyte. The comparable results reveal that the CN can adjust the electronic structure of Ru, which is beneficial for accelerating the kinetics reaction, resulting in excellent HER performances. This work provides a new strategy for designing the efficient electrocatalyst.

A new dinuclear cobalt(II) compound,[(TPA*)CoII(DHBQ2–)CoII(TPA*)]2+ (12+) {TPA* =tris[(3, 5‐dimethyl‐pyrazol‐l‐yl)methyl] amine, DHBQ = deprotonated 2, 5‐dihydroxy‐1, 4‐benzoquinone}, was prepared and structurally and magnetically characterized. X‐ray crystallography revealed the centrosymmetric dinuclear divalent cobalt ions bridged by DHBQ2– unit. The cobalt ions in the title compound have a distorted octahedral arrangement by coordination with four nitrogens of a TPA* and two oxygens of a bridging DHBQ unit. Due to the interdimer offset face‐to‐face π–π stacking in the crystallographic ac plane, the complex shows extended 2D supramolecular structure. Magnetic experiments showed the cobalt‐based dinuclear compound exhibits antiferromagnetic interactions with g = 2.35 and J/kB = –2.76 K, respectively.

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