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    Antimony Sulfoiodide-Based Energy Harvesting and Self-Powered Temperature Detection
    (2024-03-01)
    Song, Heewon
    ;
    Hajra, Sugato
    ;
    Panda, Swati
    ;
    Hwang, Subhin
    ;
    Kim, Nayoon
    The ferroelectric-semiconductor behavior of antimony sulfoiodide (SbSI) has opened up the material as a base for energy-harvesting devices. Specifically, SbSI has drawn much attention for pyroelectric energy harvesting and thermal sensing with outstanding electrothermal properties. This work investigates the thermistor properties of an SbSI material and presents the development of an SbSI nanorod/Kapton-based triboelectric nanogenerator (TENG) for effective energy harvesting and temperature sensing. The TENG based on SbSI/ Kapton operating in vertical contact separation mode delivers a peak-to-peak voltage of 90 V and a current of 1510 nA, respectively. Introducing SbSI nanorods for TENG opens the possibility of extending the conventional triboelectric series. The electrical and dielectric properties of the SbSI nanorods are investigated. SbSI exhibits a highly linear temperature coefficient of resistance (TCR) of −0.026 °C<sup>−1</sup>, making it an excellent candidate material for a thermistor. In addition, the material exhibits an excellent thermal sensitivity (β<inf>20/80</inf> = 1612.1 K). For demonstration, the SbSI thermistor is connected with TENG, and the outputs at various temperatures are analyzed for self-powered temperature sensing. This capability allows for efficient temperature monitoring without relying on external power sources, advancing remote, and autonomous sensing applications.
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    High Surface Area ZnO-Nanorods Catalyze the Clean Thermal Methane Oxidation to CO2
    (2022-12-01)
    Kessaratikoon, Tanika
    ;
    Saengsaen, Sawarin
    ;
    Del Gobbo, Silvano
    ;
    D’Elia, Valerio
    ;
    Sooknoi, Tawan
    ZnO nanostructures were synthesized by a combination of non-aqueous and aqueous sol-gel techniques to obtain morphologically different ZnO nanostructures, nanorods, and nanopyramids, featuring oxygen vacancies-rich exposed lattice faces and exhibiting different catalytic properties and activity. In particular, ZnO nanorods with high surface area (36 m<sup>2</sup>/g) were obtained through a rapid, scalable, and convenient procedure. The materials were tested for complete methane oxidation as an important benchmark reaction that is sensitive to surface area and to the availability of oxygen vacancies. Simple ZnO nanorods derived from nanosized quantum dots showed the best catalytic performance that compared well to that of several literature-reported perovskites, mixed metal oxides, and single-metal oxides in terms of T<inf>50</inf> (576 °C) and T<inf>90</inf> (659 °C) temperatures. Such a result was attributed to their high surface-to-volume ratio enhancing the availability of catalytically active sites such as oxygen vacancies whose abundance further increased following catalytic application at high temperatures. The latter effect allowed us to maintain a nearly stable catalytic performance with over 90% conversion for 12 h at 700 °C despite sintering. This research shows that ZnO-based nanomaterials with a high surface area are viable alternatives to oxides of commonly applied (but of potentially limited availability) transition metals (La, Mn, Co, Ni) for the complete combustion of methane when working at moderate temperatures (600–700 °C).