Gao Ying, Yang Xuan, Garemark Jonas, Olsson Richard T, Dai Hongqi, Ram Farsa, Li Yuanyuan
Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing 210037, China.
Wallenberg Wood Science Center, Department of Fibre and Polymer Technology, KTH Royal Institute of Technology, Stockholm SE-10044, Sweden.
ACS Sustain Chem Eng. 2023 Jul 13;11(30):11099-11109. doi: 10.1021/acssuschemeng.3c01649. eCollection 2023 Jul 31.
Hydrovoltaic energy harvesting offers the potential to utilize enormous water energy for sustainable energy systems. Here, we report the utilization and tailoring of an intrinsic anisotropic 3D continuous microchannel structure from native wood for efficient hydrovoltaic energy harvesting by FeO nanoparticle insertion. Acetone-assisted precursor infiltration ensures the homogenous distribution of Fe ions for gradience-free FeO nanoparticle formation in wood. The FeO/wood nanocomposites result in an open-circuit voltage of 63 mV and a power density of ∼52 μW/m (∼165 times higher than the original wood) under ambient conditions. The output voltage and power density are further increased to 1 V and ∼743 μW/m under 3 suns solar irradiation. The enhancement could be attributed to the increase of surface charge, nanoporosity, and photothermal effect from FeO. The device exhibits a stable voltage of ∼1 V for 30 h (3 cycles of 10 h) showing good long-term stability. The methodology offers the potential for hierarchical organic-inorganic nanocomposite design for scalable and efficient ambient energy harvesting.
水力发电能量采集为可持续能源系统利用巨大的水能提供了潜力。在此，我们报告了利用天然木材中固有的各向异性三维连续微通道结构，并通过插入FeO纳米颗粒来实现高效水力发电能量采集的方法。丙酮辅助前驱体渗透确保了铁离子的均匀分布，从而在木材中形成无梯度的FeO纳米颗粒。FeO/木材纳米复合材料在环境条件下产生的开路电压为63 mV，功率密度约为52 μW/m²（比原始木材高约165倍）。在3倍太阳光照射下，输出电压和功率密度进一步提高到1 V和约743 μW/m²。这种增强可归因于FeO表面电荷、纳米孔隙率和光热效应的增加。该装置在30小时（3个10小时周期）内表现出约1 V的稳定电压，显示出良好的长期稳定性。该方法为可扩展且高效的环境能量采集的分级有机-无机纳米复合材料设计提供了潜力。
