| Under the pressure of energy crisis and environmental pollution,people are aware of the importance of energy conversion and storage.The root way of alleviating these problems is to develop efficient catalysts.Molybdenum disulfide（Mo S2）attracted more attention in the fields of electrocatalysis,photocatalysis,and energy storage due to its unique physical and chemical properties.However,the shortcomings of Mo S2,such as self-aggregation and surface inertia,hinder its application prospects.In this paper,we use methods such as doping and combining with natural agar-derived carbon-based materials to avoid the disadvantages of Mo S2,and promote the application of Mo S2 in electrochemistry.The main content and results are as follows:（1）Natural agar was used as a carbon source and urea as a nitrogen source,annealed in a nitrogen atmosphere to obtain three-dimensional nitrogen-doped porous carbon（NPC）.The Mo S2/NPC nanomaterials were prepared by hydrothermally reacting of NPC with Mo S2.The characterization findings show that Mo S2 is evenly anchored on the NPC,which not only exposes the active site but also improves the conductivity.The Mo S2/NPC composite has a low overpotential（209 m V）at the current density of 10 m A cm-2 and a small Tafel slope(41 m V dec-1).When used as the anode electrode of lithium-ion battery,Mo S2/NPC has an initial discharge capacity of 1289m Ah g-1 at 0.1 A g-1,and a rate capacity of 712 and 419 m Ah g-1 at 0.5 and 2.0 A g-1,respectively.（2）The P-doped Mo S2/C composite material based on NPC was synthesized by hydrothermal method.It was found by characterization that non-metallic P doping further activates the surface inertness of Mo S2,thereby increases the number of active sites in the plane and the conductivity.The effect of P doping amount on electrocatalytic performance was explored,and it shows that the catalytic effect is the best when the doping amount of P is 0.1 g.At the current density of 10 m A cm-2,the overpotential can reach 167 m V,and the Tafel slope is 45 m V dec-1.（3）Using agar as carbon source and sodium dodecyl sulfate as surfactant for hydrothermal reaction,tubular and bowl-like carbon precursor were prepared by controlling the hydrothermal reaction time.After being calcined at high temperature and hydrothermally combined with Mo S2,the electrocatalytic hydrogen evolution performance of the composite was explored.The experiment results prove that the bowl-shaped carbon obtained by hydrothermal treatment for 12 h shows the best performance when combined with Mo S2,and the overpotential is 231 m V at a current density of 10 m A cm-2. |
