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A (101¯0$10\bar{1}0$)‐Orientated ZnO Single Crystal Chem‐Voltaic Device Beyond Conventional Fuel Cells.

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Titel: A (101¯0$10\bar{1}0$)‐Orientated ZnO Single Crystal Chem‐Voltaic Device Beyond Conventional Fuel Cells.
Autoren: Meng, Xiaohua, Liu, Bin, Yang, Heqing, Liu, Shengzhong
Quelle: Advanced Materials Technologies; Oct2024, Vol. 9 Issue 19, p1-10, 10p
Schlagwörter: CHEMICAL energy, ELECTRIC currents, ELECTRIC fields, SINGLE crystals, OXIDATION-reduction reaction
Abstract: To date, new prototype device for directly converting chemical energy into electricity is still the most important pursuit although various types of fuel cells have been developed/commercialized. In this work, a novel (101¯0$10\bar{1}0$) orientated ZnO single crystal device is reported that generates electricity using the usual redox reactions. The principle of the device is similar to that of a photovoltaic device, known as a chem‐voltaic device. The air‐KBH4 chem‐voltaic device has an open‐circuit voltage (Voc) of 2.14 ± 0.007 mV and a short‐circuit current (Isc) of 1.44 ± 0.007 µA. The Voc and Isc increase to 2.24 mV and 2.81 µA, respectively, by preadding H2O2. A similar phenomenon is also observed when glucose is used to substitute KBH4. When KBH4 or glucose solution is added to the ZnO (101¯0$10\bar{1}0$) surface, it reacts with chemisorbed oxygen to produce free electrons. Due to the presence of the spontaneous electric field (Es) in the polar [0001] azimuth of ZnO, these free electrons move along the [0001] direction, producing an electric current. So chemical energy is converted into electricity. This finding opens up research on the chem‐voltaic cell. [ABSTRACT FROM AUTHOR]
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Abstract:To date, new prototype device for directly converting chemical energy into electricity is still the most important pursuit although various types of fuel cells have been developed/commercialized. In this work, a novel (101¯0$10\bar{1}0$) orientated ZnO single crystal device is reported that generates electricity using the usual redox reactions. The principle of the device is similar to that of a photovoltaic device, known as a chem‐voltaic device. The air‐KBH4 chem‐voltaic device has an open‐circuit voltage (Voc) of 2.14 ± 0.007 mV and a short‐circuit current (Isc) of 1.44 ± 0.007 µA. The Voc and Isc increase to 2.24 mV and 2.81 µA, respectively, by preadding H2O2. A similar phenomenon is also observed when glucose is used to substitute KBH4. When KBH4 or glucose solution is added to the ZnO (101¯0$10\bar{1}0$) surface, it reacts with chemisorbed oxygen to produce free electrons. Due to the presence of the spontaneous electric field (Es) in the polar [0001] azimuth of ZnO, these free electrons move along the [0001] direction, producing an electric current. So chemical energy is converted into electricity. This finding opens up research on the chem‐voltaic cell. [ABSTRACT FROM AUTHOR]
ISSN:2365709X
DOI:10.1002/admt.202400184