Hierarchically Porous Cellulose Membrane via Self‐Assembly Engineering for Ultra High‐Power Thermoelectrical Generation in Natural Convection
Haodong Sun,
Fengjie Tang,
Yinghao Bi
et al.
Abstract:Renewable heat‐to‐power conversion based on thermoelectric strategy holds strong prospect toward clean electricity generation in low‐carbon society, in which its conversion performance is mainly decided by the temperature gradient. However, achieving a high temperature gradient spontaneously throughout the day in natural convection remains a significant challenge. Herein, cost‐effective, sustainable, and hierarchically porous cellulose membrane (HPCM) created through a simple self‐assembly engineering of cellu… Show more
“…A critical challenge in osmotic energy harvesting is the advancement of ion exchange membranes that are both porous and highly surface-charged (Sun et al 2023;Li et al 2022;Pattle 1954). Drawing inspiration from biological ion channels, recent studies have explored ion exchange membranes equipped with nano uidic ion channels ( Gao et al 2021;Chen et al 2017;Fu et al 2023).…”
Energy derived from the salinity gradient between seawater and river water is recognized as a sustainable energy source and an alternative solution for meeting the growing energy demand. The ion exchange membrane is essential for efficiently converting the osmotic energy of the salinity gradient into electrical energy. Herein, we reported a sustainable, porous cellulose membrane (PCM) by a doping-removing strategy of polyvinyl pyrrolidone (PVP) during the fabricating process of the cellulose membrane. Such a strategy effectively optimizes the structure of cellulose membrane, such as improved porosity (from 66.2–89%), enlarged specific surface area (from 7.99 m2/g to 12.86 m2/g), and increased water retention value (from 113.4–141.1%). As a result, the developed PCM shows excellent ion transport capacity and selectivity with a high t+ of 0.88. The power density of PCM reaches up to 4.16 W/m2, substantially exceeding that of the primary cellulose membrane. Moreover, the PCM harvests osmotic energy very well with long-term stability, over 80000 s with continuous operation. The PCM, utilizing sustainable and low-cost natural materials, shows considerable promise for renewable osmotic energy harvesting.
“…A critical challenge in osmotic energy harvesting is the advancement of ion exchange membranes that are both porous and highly surface-charged (Sun et al 2023;Li et al 2022;Pattle 1954). Drawing inspiration from biological ion channels, recent studies have explored ion exchange membranes equipped with nano uidic ion channels ( Gao et al 2021;Chen et al 2017;Fu et al 2023).…”
Energy derived from the salinity gradient between seawater and river water is recognized as a sustainable energy source and an alternative solution for meeting the growing energy demand. The ion exchange membrane is essential for efficiently converting the osmotic energy of the salinity gradient into electrical energy. Herein, we reported a sustainable, porous cellulose membrane (PCM) by a doping-removing strategy of polyvinyl pyrrolidone (PVP) during the fabricating process of the cellulose membrane. Such a strategy effectively optimizes the structure of cellulose membrane, such as improved porosity (from 66.2–89%), enlarged specific surface area (from 7.99 m2/g to 12.86 m2/g), and increased water retention value (from 113.4–141.1%). As a result, the developed PCM shows excellent ion transport capacity and selectivity with a high t+ of 0.88. The power density of PCM reaches up to 4.16 W/m2, substantially exceeding that of the primary cellulose membrane. Moreover, the PCM harvests osmotic energy very well with long-term stability, over 80000 s with continuous operation. The PCM, utilizing sustainable and low-cost natural materials, shows considerable promise for renewable osmotic energy harvesting.
Passive daytime radiative cooling (PDRC) materials with sustainable energy harvesting capability is critical to concurrently reduce traditional cooling energy utilized for thermal comfort and transfer natural clean energies into electricity. Herein, a versatile photonic film (Ecoflex@BTO@UAFL) based on a novel fluorescent luminescence color passive radiative cooling with triboelectric and piezoelectric effect is developed by filling the dielectric BaTiO3 (BTO) nanoparticles and ultraviolet absorption fluorescent luminescence (UAFL) powder into the elastic Ecoflex matrix. Test results demonstrate that the Ecoflex@BTO@UAFL photonic film exhibits a maximum passive radiative cooling effect of ∽10.1 °C in the daytime. Meanwhile, its average temperature drop in the daytime is ~4.48 °C, which is 0.91 °C higher than that of the Ecoflex@BTO photonic film (3.56 °C) due to the addition of UAFL material. Owing to the high dielectric constant and piezoelectric effect of BTO nanoparticles, the maximum power density (0.53 W m−2, 1 Hz @ 10 N) of the Ecoflex@BTO photonic film‐based hybrid nanogenerator is promoted by 70.9% compared to the Ecoflex film‐based TENG. This work provides an ingenious strategy for combining PDRC effects with triboelectric and piezoelectric properties, which can spontaneously achieve thermal comfort and energy conservation, offering a new insight into multifunctional energy saving.
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