Alem Asab Fetene, Worku Ababay Ketema, Ayele Delele Worku, Wubieneh Tessera Alemneh, Teshager Alebel Abebaw, Admasu Bimrew Tamrat, Teshager Minbale Admas, Asege Addisu Alemayehu, Ambaw Mehary Dagnew, Zeleke Misganaw Alemu, Shibesh Alemayehu Kifle, Yemata Temesgen Atnafu
Bahir Dar Energy Center, Bahir Dar Institute of Technology, Bahir Dar University, P.O. Box 26, Bahir Dar, Ethiopia.
Department of Chemistry, College of Science, Bahir Dar University, P.O. Box 79, Bahir Dar, Ethiopia.
Heliyon. 2023 Jan 31;9(2):e13286. doi: 10.1016/j.heliyon.2023.e13286. eCollection 2023 Feb.
Ag doped CoO nanoparticles (NPs) were synthesized via a co-precipitation method changing the concentration of Ag. The crystal structure, morphology, surface area, functional group, optical band gap, and thermal property were investigated by XRD, SEM, BET, FTIR, UV-Vis, and TGA/DTA techniques. The XRD results showed the formation of single-cubic CoO nanostructured materials with an average crystal size of 19.37 nm and 12.98 nm for pristine CoO and 0.25 M Ag-doped CoO NPs. Morphological studies showed that pristine CoO and 0.25 M Ag-doped CoO NPs having a porous structure with small spherical grains, porous structures with sponge-like structures, and loosely packed porous structures, respectively. The pristine and 0.25 M Ag-doped CoO NPs showed BET surface areas of 53.06 m/g, and 407.33 m/g, respectively. The band gap energy of CoO NPs were 2.96 eV, with additional sub-bandgap energy of 1.95 eV. Additionally, it was discovered that the band gap energies of 0.25 M Ag-doped CoO NPs ranged from 2.2 to 2.75 eV, with an extra sub-band with energies ranging from 1.43 to 1.94 eV for all as-prepared samples. The Ag-doped CoO as prepared samples show improved thermal properties due to the doping effect of silver. The CV test confirmed that the 0.25 M Ag-doped CoO NPs exhibited the highest specific capacitance value of 992.7 F/g at 5 mV/s in a 0.1 M KOH electrolyte solution. The energy density and power density of 0.25 M Ag-doped CoO NPs were 27.9 W h/kg and 3816.1 W/kg, respectively.
通过共沉淀法合成了不同银浓度掺杂的钴酸银纳米颗粒（NPs）。采用X射线衍射（XRD）、扫描电子显微镜（SEM）、比表面积分析仪（BET）、傅里叶变换红外光谱仪（FTIR）、紫外可见分光光度计（UV-Vis）和热重/差示热分析仪（TGA/DTA）技术对其晶体结构、形貌、比表面积、官能团、光学带隙和热性能进行了研究。XRD结果表明，原始的CoO和0.25M银掺杂的CoO NPs形成了平均晶体尺寸分别为19.37nm和12.98nm的单立方CoO纳米结构材料。形貌研究表明，原始CoO和0.25M银掺杂的CoO NPs分别具有小球形颗粒的多孔结构、海绵状结构的多孔结构和松散堆积的多孔结构。原始CoO和0.25M银掺杂的CoO NPs的BET比表面积分别为53.06m²/g和407.33m²/g。CoO NPs的带隙能量为2.96eV，还有1.95eV的附加亚带隙能量。此外，发现0.25M银掺杂的CoO NPs的带隙能量范围为2.2至2.75eV，对于所有制备的样品，还有一个能量范围为1.43至1.94eV的额外亚带。由于银的掺杂效应，制备的银掺杂CoO样品表现出改善的热性能。循环伏安（CV）测试证实，在0.1M KOH电解质溶液中，0.25M银掺杂的CoO NPs在5mV/s时表现出最高比电容值992.7F/g。0.25M银掺杂的CoO NPs的能量密度和功率密度分别为27.9W h/kg和3816.1W/kg。
