| 학회 | 한국재료학회 |
| 학술대회 | 2021년 가을 (11/24 ~ 11/26, 경주 라한호텔) |
| 권호 | 27권 2호 |
| 발표분야 | C. 에너지 재료 분과 |
| 제목 | Why does water in porous carbon generate electricity? |
| 초록 | To resolve the global energy crisis, the emerging technology of hydrovoltaic has drawn extensive attention in last decade. Hydrovoltaic utilizes the flow of water through porous materials, of which driving forces are conjectured as streaming potential or ion diffusion. This simple interaction of water-nanomaterials generates enough electricity to power small electronic devices and further scalable. However, it is a sophisticated event involving multiple concurrent physics and a lack of understanding in principles underlying electricity generation has slowed technological advances. There have been serious debates on underlying physics on this novel phenomenon, but the progress is extremely sluggish due to difficulty in observing atomic-scale non-equilibrium event. Here, we propose the first theoretical model for hydrovoltaic devices to provide in-depth interpretation and analysis of the working principles. The multiphysics model, which considers flow in an unsaturated porous medium, the chemical reactions, transportation of dilute species, and electrostatics, was validated using surrogate experiments and the literature. Our analysis demonstrates that electricity generation in this case is governed by ion diffusion, and protonation in the reaction between carbon material and water is the key. Furthermore, sensitivity analysis for the output voltage reveals that the reaction barrier height, relative humidity, and porosity are the most crucial parameters. Optimization of these parameters can significantly enhance the output voltage without requiring high investment in topology or material design. |
| 저자 | 조성범, 고현석 |
| 소속 | 한국세라믹기술원 가상공학센터 |
| 키워드 | Hydrovoltaic; Multiphysics simulation; energy harvester |
