论文写作实践6
- 格式：docx
- 大小：22.93 KB
- 文档页数：2
1
Research Paper Writing Task (6)
Name Zhang Hao Student ID
192212066
School College of physics and electronic Class C6 (New campus)
Task Discussion/Conclusion Date Nov. 12, 2019
Study on energy storage performance of graphene ultracapacitor
Discussion
The electrolyte in the pore structure of horizontal graphene discharges the air in the pore structure
under the action of capillary force and additional driving pressure. For a large number of stacked and
agglomerated horizontal graphene sheet structures, capillarity can only provide a driving force in the
horizontal direction. The electrolyte seepage must be driven by additional seepage pressure to penetrate
the hole structure vertically. Compared with the single pore structure unit composed of graphene flake
layers in chapter 4, in the complex pore structure of horizontal graphene, a large number of graphene flake
layers are randomly stacked and agglomerated. To completely drain the pore structure with the electrolyte,
the air inside must pass vertically through tightly stacked graphene sheets. Therefore, the significant
increase of air resistance brings great difficulties to the flow of electrolyte in the pore structure of
horizontal graphene. When the driving pressure is small, the electrolyte is difficult to break through the
hole structure in the vertical direction. This invalids the capillary driving force of the graphene sheet on
the electrolyte in the horizontal direction, The seepage force of electrolyte is not enough to overcome the
large air resistance in horizontal graphene lamella structure. At this time, the effect of electrolyte
displacement of air is poor, and the electrolyte can only penetrate into the surface graphene sheet. Increase
drive pressure· promote the electrolyte to flow in the vertical direction and break through more pore
structures, thus further improving the degree of electrolyte flow and the effective utilization rate of
horizontal graphene sheet surface area. The above simulation results reveal that the driving pressure
promotes the flow of electrolyte in the pore structure of horizontal graphene.
Combined with the simulation results, it can be seen that the change of average pore diameter has
different effects on capillary driving force and seepage resistance. For horizontal graphene electrode
materials, the decrease of average pore diameter leads to more serious stacking and agglomeration of
graphene. At this time, the flow channel becomes more tortuous and complex, and the seepage resistance
is greater than the capillary driving force formed on the surface of the graphene sheet. Therefore, the
degree of electrolyte seepage is weakened, and the utilization degree of the surface of the graphene sheet
decreases accordingly. When the mean pore diameter increased, the stacking and agglomeration effects of
graphene gradually decreased. At this time, the overall curvature of the electrolyte seepage channel
decreases, the complexity of the morphology and structure is greatly reduced, and the seepage resistance
is less than the capillary driving force formed on the surface of the graphene sheet, so the overall seepage
2
degree of the electrolyte is further improved.
评分表
自己评分 评语 签名
同学评分 评语 签名
教师评分 评语 签名
