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To improve the catalytic performances of Pt-based catalysts toward the methanol oxidation reaction (MOR) and reduce the consumption of Pt, we report one-step facile fabrication of radial PtCo nanodendrites (NDs) by a modified solvothermal method. It is noticeable that the radial PtCo NDs have a Pt-rich surface, and the radial PtCo NDs possess more tip areas due to unique first level NDs and more interconnected second level NDs, which can facilitate electronic transmission and mass exchange. Compared with commercial Pt/C, the radial PtCo NDs catalyst shows enhanced catalytic performance and stability toward the MOR. More importantly, this study offers more opportunities to prepare bimetallic NDs with enhanced catalytic performance.

One-pot synthesis Pt−Pd bimetallic nanostructure has become a promising way to get superior oxygen reduction reaction performance and cost-effective electrocatalyst for proton exchange membrane fuel cells. In this work, we report a facile one-pot method by tuning the feed ratio of Pt and

Three-dimensional self-assembled hierarchical NiMn2O4@CoS core–shell microspheres were synthesized via facile hydrothermal and post-electrodeposition methods on a Ni substrate. The microspheres were irregularly composed of many nanoflakes, whose diameter was approximately 1.8 μm. The NiMn2O4@CoS composites were used as electrode materials exhibiting a ultrahigh specific capacitance and excellent cycle performance for pseudocapacitors. The specific capacitance of the composite electrode reached 1751 F/g at a current density of 1 A/g and 1270 F/g at a higher current density of 30 A/g. Most importantly, the specific capacitance still maintained 95% of the original value after 5000 cycles at 10 A/g. A NiMn2O4@CoS//stereotaxically constricted graphene (SCG) asymmetric supercapacitor device also showed a high energy density of 44.56 W h kg–1 at a power density of 700.51 W/kg and an enormous power density of 20.99 kW/kg at 29.1 W h kg–1. Moreover, the capacitance still maintained 94% of the original value even after 5000 cycles at 10 A/g. This outstanding electrochemical performance possibly makes NiMn2O4@CoS the next candidate electrode material for supercapacitor applications.

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