Zirconium ferrite nanoparticles as smart materials for energy and environmental applications: fractional-order supercapacitors, reservoirs of F− ions, and efficient electrocatalysts for water splitting

IF 4.6 3区 材料科学 Q2 CHEMISTRY, MULTIDISCIPLINARY
Amit Sahoo, Achyuta N. Acharya, Priyambada Jena, M. Moonis, J. P. Biswal, S. Swain and M. C. Tripathy
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Abstract

A novel electrocatalyst, zirconium ferrite nanoparticles (NPs) (ZrFe2O5 NPs), was synthesized through coprecipitation and calcination processes at 300 °C and 500 °C using iron rust. The ZrFe2O5 NPs were used as catalysts for the hydrogen evolution reaction. Furthermore, these NPs in an alkaline medium exhibited superior properties of a fractional order supercapacitor, based on which a prototype device was fabricated to demonstrate its energy storage applications. The capacitance and phase graphs of the fractional-order supercapacitor exhibit a peak value of 1.5 F s−1−α in the mid-frequency range, followed by a decrease at increased frequencies. Furthermore, these NPs were found to be the most effective agents for removing fluoride ions. In a modified one-pot synthetic approach, the hydrogel (Hy) was synthesized using PVA and glycerine in an aqueous medium at 100 °C. The composite Hy membranes were prepared by mixing Hy with these NPs, which were applied to remove fluoride ions efficiently within the pH range of 1–10 from the aqueous medium through adsorption, yielding defluorinated water. The adsorption process of fluoride ions was correlated with the Freundlich and Langmuir isotherms, with pseudo-second-order kinetics as the preferred approach. The zirconium ferrite NPs and the composite Hy membranes were characterized through various characterization techniques, i.e., XRD, XPS, FTIR, solid UV-visible spectroscopy, STA, FESEM, HRTEM, and BET surface area analysis.

Abstract Image

作为能源和环境应用的智能材料的氧化锆铁氧体纳米颗粒:分数级超级电容器,F离子储存器和水分解的高效电催化剂。
以铁锈为原料,在300℃和500℃条件下,通过共沉淀法和煅烧法合成了新型电催化剂铁酸锆纳米颗粒(ZrFe2O5 NPs)。ZrFe2O5 NPs作为析氢反应的催化剂。此外,这些NPs在碱性介质中表现出分数阶超级电容器的优异性能,并在此基础上制作了一个原型装置来演示其储能应用。分数阶超级电容器的电容和相位图在中频范围内峰值为1.5 F s-1-α,随频率的增加而减小。此外,这些NPs被发现是去除氟离子最有效的剂。采用改进的一锅合成方法,在100℃的水介质中,以聚乙烯醇和甘油为原料合成水凝胶(Hy)。将Hy与这些NPs混合制备复合Hy膜,并将其用于吸附水中pH在1-10范围内的氟离子,得到除氟水。氟离子的吸附过程与Freundlich和Langmuir等温线相关,拟二级动力学是首选的方法。采用XRD、XPS、FTIR、固相紫外可见光谱、STA、FESEM、HRTEM、BET等表征技术对铁酸锆纳米粒子及其复合Hy膜进行了表征。
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来源期刊
Nanoscale Advances
Nanoscale Advances Multiple-
CiteScore
8.00
自引率
2.10%
发文量
461
审稿时长
9 weeks
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