Program in Nano Science and Technology, Graduate School of Convergence Science and Technology, Seoul National University, Seoul, 08826, Republic of Korea.
Department of Chemistry and Chemical Biology, Harvard University, 12 Oxford Street, Cambridge, MA, 02138, USA.
Small. 2021 Nov;17(45):e2103448. doi: 10.1002/smll.202103448. Epub 2021 Oct 5.
Water-infiltration-induced power generation has the renewable characteristic of generating electrical energy from ambient water. Importantly, it is found that the carrier concentration in semiconductor constituting the energy generator seriously affect the electricity generation. Nevertheless, few studies are conducted on the influence of semiconductor carrier concentration, a crucial factor on electricity generation. Due to this, understanding of the energy harvesting mechanism is still insufficient. Herein, the semiconductor carrier concentration-dependent behavior in water-infiltration-induced electricity generation and the energy harvesting mechanism by ionovoltaic effect are comprehensively verified. A clue to enhance the electric power generation efficiency is also proposed. When 20 µL of water (NaCl, 0.1 m) infiltrates into a porous CuO nanowires film (PCNF), electric power of ≈0.5 V and ≈1 µA are produced for 25 min. Moreover, the PCNF shows good practicability by generating electricity using various ambient water, turning on LEDs, and being fabricated as a curved one.
水渗透发电具有从环境水中产生电能的可再生特性。重要的是，人们发现构成能源发生器的半导体中的载流子浓度严重影响发电。然而，关于半导体载流子浓度对发电的影响的研究很少，而半导体载流子浓度是影响发电的关键因素。因此，对能量收集机制的理解仍然不足。在此，全面验证了水渗透发电中半导体载流子浓度依赖性行为以及离子光伏效应的能量收集机制。还提出了提高发电效率的线索。当 20 µL 的水（NaCl，0.1 m）渗透到多孔 CuO 纳米线薄膜（PCNF）中时，可产生约 0.5 V 和约 1 µA 的电力，持续 25 分钟。此外，PCNF 还具有良好的实用性，可利用各种环境水发电、点亮 LED 灯，并可制成弯曲状。
