The rational design and construction of efficient and low-cost hydrogen evolution reaction (HER) electrocatalysts are important current research tasks. Molybdenum disulfide (MoS 2 ) is a typical platinum-like compound with limitless application potential in the HER. However, the application of MoS 2 is greatly limited by its high overpotential and poor performance in alkaline media. We report here a three-dimensional (3D) porous nitrogen-doped CoMoS 3.13 /CoS/MoS 2 (CoMoS x ) hybrid heterojunction electrocatalyst with good alkaline HER performance. Nitrogen-doped CoMoS x was prepared by a simple electrodeposition method followed by annealing treatment. Optimized nitrogen-doped CoMoS x (CoMoS x -10) prepared by 10 min of electrodeposition showed good HER performance with an overpotential of 49 mV at 10 mA cm −2 and 133 mV at 100 mA cm −2 in 1.0 M KOH, better than most recently reported self-supported cobalt-or molybdenum-based electrocatalysts. It also showed good durability, operating at current densities of 10 and 100 mA cm −2 for 80 h without significant changes in its hydrogen production efficiency. The intrinsic HER kinetic characteristics suggest that the high catalytic activity of CoMoS x -10 is due to not only the large active surface area generated by its 3D porous fleece morphology but also its intrinsic catalytic properties, which are greatly enhanced by the formation of heterogeneous junctions.
Abstract.With the advent of the information age, information expansion inevitable procedures to deal with the scale of the data is also increasing, based on C + + and Java program, there is a memory leak problem. When the data size is relatively small, these problems may be insignificant, but when processing large data, these defects will be highlighted, serious will cause the program to crash, system downtime and, ultimately, cannot do the expected goal. In large data processing program, the memory leak problem cannot be ignored, combined with multi threading technology and the self-healing technology to carry out the necessary processing, can make the program can be successfully executed to complete the intended target.
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