Performance of supercapacitors with RuO2 electrodes spray deposited with aqueous/organic solvent mixtures: effect of substrate temperature

IF 1.3 4区材料科学 Q3 CRYSTALLOGRAPHY Phase Transitions Pub Date : 2023-01-11 DOI:10.1080/01411594.2022.2164495

R. Chandrashekhar, A. A. Yadav

引用次数: 1

Abstract

ABSTRACT RuO2 electrodes were spray-deposited utilizing an aqueous/organic solvent mixture at varied substrate temperatures. X-ray diffraction data supported the rutile structure and tetragonal phase of RuO2. FESEM images showed a porous structure with small spherical grains covering the entire substrate surface. Optical studies have shown that RuO2 films have bandgaps between 1.90 and 2.13 eV. Electrical resistivity was found in the range of 0.57 × 104 Ω-cm to 1.23 × 104 Ω-cm. CV (scan rate 5 mVs−1) results confirmed the specific capacitances of 560, 637, 687, 602 and 527 Fg−1 at substrate temperatures of 250, 275, 290, 300 and 325°C, respectively, in 0.5 M H2SO4 electrolyte. RuO2 provided a high specific capacitance 741 Fg−1 (current density 0.5 Ag−1) from GCD profile besides good specific capacitance holding of 87.66% over 3000 continuous charge–discharge cycles. The results show that RuO2 films spray deposited with aqueous/organic solvent mixtures give the best results.

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水/有机溶剂混合物喷射沉积RuO2电极的超级电容器性能：衬底温度的影响

RuO2电极是利用水性/有机溶剂混合物在不同的衬底温度下喷射沉积的。X射线衍射数据支持RuO2的金红石结构和四方相。FESEM图像显示多孔结构，具有覆盖整个衬底表面的小球形颗粒。光学研究表明，RuO2薄膜的带隙在1.90和2.13之间发现电阻率在0.57的范围内 × 104 Ω-cm至1.23 × 104 Ω-cm。CV（扫描速率5 mVs−1）的结果证实了560、637、687、602和527的比电容基板温度分别为250、275、290、300和325°C时的Fg−1，0.5 M H2SO4电解质。RuO2提供了高比电容741 Fg−1（电流密度0.5 Ag−1），此外在3000次连续充放电循环中保持87.66%的良好比电容。结果表明，用水性/有机溶剂混合物喷涂沉积的RuO2膜给出了最佳的结果。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Phase Transitions 物理-晶体学

CiteScore

3.00

自引率

6.20%

发文量

审稿时长

1.4 months

期刊介绍： Phase Transitions is the only journal devoted exclusively to this important subject. It provides a focus for papers on most aspects of phase transitions in condensed matter. Although emphasis is placed primarily on experimental work, theoretical papers are welcome if they have some bearing on experimental results. The areas of interest include: -structural phase transitions (ferroelectric, ferroelastic, multiferroic, order-disorder, Jahn-Teller, etc.) under a range of external parameters (temperature, pressure, strain, electric/magnetic fields, etc.) -geophysical phase transitions -metal-insulator phase transitions -superconducting and superfluid transitions -magnetic phase transitions -critical phenomena and physical properties at phase transitions -liquid crystals -technological applications of phase transitions -quantum phase transitions Phase Transitions publishes both research papers and invited articles devoted to special topics. Major review papers are particularly welcome. A further emphasis of the journal is the publication of a selected number of small workshops, which are at the forefront of their field.