| Autor: |
Lin, Dou, Zhou, Ziyan, Shi, Ronghao, Chen, Bin, Huang, Zhulin, Tang, Haibin, Wang, Jun, Zhu, Xiaoguang, Shao, Cheng, Han, Fangming |
| Zdroj: |
Journal of Materials Chemistry A; 8/21/2024, Vol. 12 Issue 31, p19885-19890, 6p |
| Abstrakt: |
High-pressure environments require that power supplies of electronic devices can withstand high pressure without a hard shell. While compact reduced graphene oxide (rGO) electrodes enhance pressure tolerance, they suffer from compromised capacitance and power output due to the decreased ion-accessible surface area and blocked or collapsed ion channels. To overcome this challenge, carbon quantum dots (CQDs) were uniformly embedded into rGO film to create a compact yet porous electrode. This was achieved via a hydrothermal reaction to form a rGO/CQDs hydrosol by bonding CQDs to rGO nanosheets, followed by a subsequent vacuum filtering. The "spacer" function of CQDs improves the ion-accessible surface area, ion migration, and compressive strength of the rGO/CQDs films. Molecular dynamics simulations further confirm that embedded CQDs enhance both Young's modulus and the diffusion coefficient of hydronium ions within the rGO/CQDs films. Thus, at an ultra-high pressure of 360 MPa, the prepared rGO/CQDs films retained an impressive 81.2% of their initial capacitance (219.7 F cm−3 at 0.8 mA cm−2). The rGO/CQDs-based supercapacitors retained a high volumetric power density of 59.4 W cm−3 at 180 MPa. These findings demonstrate the great potential of rGO/CQDs films for pressure-tolerant power supply devices. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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