Synthesis of microcrystalline ZnO as an anodic material via a solvothermal method, and its electrochemical performance in Ni/Zn redox battery
| Autor: | Byeong Sub Kwak, Kyoung Soo Park, Kwang-il Chung, Seung Won Jo, Jaehwan Jeon, Tae Woo Cho, Misook Kang |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
General Chemical Engineering Inorganic chemistry chemistry.chemical_element 02 engineering and technology Zinc Electrolyte 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences Redox 0104 chemical sciences Crystallinity Microcrystalline chemistry Chemical engineering Transmission electron microscopy Cyclic voltammetry 0210 nano-technology |
| Zdroj: | Journal of Industrial and Engineering Chemistry. 46:111-118 |
| ISSN: | 1226-086X |
| Popis: | Highly crystalline ZnO microparticles were prepared by a conventional solvothermal route by adding ethylenediamine (EDA). The product was analyzed by X-ray diffraction (XRD) and transmission electron microscopy (TEM) to investigate its crystallinity and morphology. The ZnO microparticles showed high purity and perfect crystallinity, and hexagonal rod shapes (width 5.0 μm × length 15.0 μm) were seen in the powdered particles. ZnO microparticles (0.5 M) were dissolved in 4.0 M LiOH, NaOH, and KOH alkaline electrolytes in order to evaluate their electrochemical properties. The cyclic voltammetry (CV) curves revealed that the micro-sized hexagonal ZnO rods dissolved in KOH electrolyte exhibited superior electrochemical activity to those dissolved in LiOH and NaOH electrolytes. The micro-sized hexagonal ZnO rods in KOH electrolyte showed a significantly improved cycle stability until the 100th cycle, and reached a discharge capacity of 143.6 mA h g −1 , an efficiency of 86%, and a discharge voltage of 1.72 V at a current density of 30 mA cm −2 . Moreover, during repeated charging-discharging cycles, the growth of zinc dendrites was suppressed, resulting in improved cycle stability in Ni/Zn redox batteries. |
| Databáze: | OpenAIRE |
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