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The energy density of carbon microtube bundles (CMTBs) is usually low and the preparation process is complex. After carbonization, washing and activation, the prepared metaplexis shell-based carbon microtube bundles (MS-CMTBs) not only have an open structure, but also a rich porous structure on the tube wall. The pulsed electrooxidation technology can promote the formation of functional groups on the tube wall and further enhance the energy density of the material. After assembling the electrooxidized material into an all-solid-state supercapacitor, the capacitor has a capacity of 15.1 Wh kg−1 at 0.5 A g−1 and a capacity retention rate of 95.9% after 10 000 cycles at 10 A g−1, indicating that these functional groups are relatively stable. The result shows that the MS-CMTBs before pulsed electrooxidation are more suitable as positive electrode materials, while the electrooxidized material can be either a positive or negative electrode material. This work provides an idea for the design and development of electrode materials in high-performance all-solid-state supercapacitors.

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Hydrogen energy has become the most potential energy source due to its high calorific value and environment-friendly combustion products. However, there are huge economic problems in hydrogen storage and transportation. Hydrogen can be prepared by catalysis in a way of reducing cost and speeding up speed which is the core idea of electrocatalytic water decomposition for hydrogen production. In this work, we developed an electrode material for Hydrogen evolution reaction (HER) bimetallic catalyst, and achieved that the hydrogen overpotential produced by acidic non-precious metal catalyst under acidic environment was only 275mV. More importantly, a good idea was provided for bimetallic co-catalysis of HER.

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