Synergistic Effects and Characterization of CoMn2O4/Graphene in DSSC Counter Electrodes

IF 2.2 4区 工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC Journal of Electronic Materials Pub Date : 2024-09-04 DOI:10.1007/s11664-024-11388-z
Muhammad Shahid Khan, Farasat Haider, Adnan Majeed, Muhammad Musharaf, Naeem Ahmed, Abdul Majid, Khalid Javed, Mashkoor Ahmed
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Abstract

This work is focused on fabricating a counter electrode (CE) for application in a dye-sensitized solar cell (DSSC). Cobalt manganese oxide (CoMn2O4) nanoparticles (NPs) and its nanocomposite with graphene were prepared by a hydrothermal method. The nanocomposites of cobalt manganese oxide with graphene as CoMn2O4/(graphene)x (where x = 0.2, 0.4, and 0.6) were synthesized as an electrode material, and a cell was fabricated for the x = 0.6 nanocomposite to investigate the activity for use in DSSCs. These nanocomposites were characterized by x-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive x-ray spectroscopy (EDX), and Fourier transform infrared (FTIR) spectroscopy. SEM analysis revealed the nature of the particles, and the average grain size was in good agreement with XRD results. EDX showed the ratio of the respective samples. The XRD pattern showed the hexagonal structure of CoMn2O4 NPs with an average size of 39.45 nm. The FTIR spectrum indicated O–H stretching bonds and the vibrational bending of MnO at the interstitial sites. For electrochemical analysis, cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) were performed. Through CV analysis, an anodic peak current (Ipa) was observed at 41.42 µA, while the cathodic peak current (Ipc) was observed at −37.13 µA, and peak-to-peak separation (ΔEpp) = 0.31 V for CoMn2O4 NPs. For graphene, Ipa = 180.45 µA, Ipc = −230 µA, and ΔEpp = 0.25 V, while Ipa = 100.23 µA, Ipc = 80.65 µA, and ΔEpp = 0.16 V for the CoMn2O4/graphene (x = 0.6) nanocomposite, which also showed excellent electrocatalytic properties. The charge transfer mechanism on the surface of the electrode was found to have rapid oxidation–reduction behavior and can be used as an alternative to platinum as the CE in the DSSC. The CV analysis of the CoMn2O4/graphene (x = 0.6) nanocomposite-based DSSC showed that the Ipa current was observed at 26.85 mA, while the Ipc current was observed at −27.25 mA in the two-electrode system. The Rs values for CoMn2O4/graphene with x = 0.2, 0.4, and 0.6 were 142.80 Ω, 141.33 Ω, 135.18 Ω, and 131.18 Ω, respectively, as an electrode material. The exchange current density J = 2.13 × 10−3 A/cm2 was found using the charge transfer resistance value (Rct = 6.03 Ω cm2) and was verified by the Tafel curve.

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DSSC 对电极中 CoMn2O4/Graphene 的协同效应和特性分析
这项工作的重点是制造一种应用于染料敏化太阳能电池(DSSC)的对电极(CE)。通过水热法制备了钴锰氧化物(CoMn2O4)纳米颗粒(NPs)及其与石墨烯的纳米复合材料。作为电极材料,合成了锰酸钴与石墨烯的纳米复合材料 CoMn2O4/(石墨烯)x(其中 x = 0.2、0.4 和 0.6),并制作了 x = 0.6 纳米复合材料电池,以研究其在 DSSC 中的应用活性。这些纳米复合材料通过 X 射线衍射 (XRD)、扫描电子显微镜 (SEM)、能量色散 X 射线光谱 (EDX) 和傅立叶变换红外光谱 (FTIR) 进行了表征。扫描电子显微镜分析揭示了颗粒的性质,平均粒度与 XRD 结果非常吻合。EDX 显示了各样品的比例。XRD 图谱显示 CoMn2O4 NPs 为六方结构,平均尺寸为 39.45 nm。傅立叶变换红外光谱显示了 O-H 伸展键和 MnO 在间隙位点的振动弯曲。电化学分析采用了循环伏安法(CV)和电化学阻抗谱法(EIS)。通过 CV 分析,观察到 CoMn2O4 NPs 的阳极峰值电流(Ipa)为 41.42 µA,阴极峰值电流(Ipc)为 -37.13 µA,峰-峰分离(ΔEpp)= 0.31 V。石墨烯的 Ipa = 180.45 µA、Ipc = -230 µA、ΔEpp = 0.25 V,而 CoMn2O4/ 石墨烯 (x = 0.6) 纳米复合材料的 Ipa = 100.23 µA、Ipc = 80.65 µA、ΔEpp = 0.16 V,同样表现出优异的电催化性能。研究发现,电极表面的电荷转移机制具有快速氧化还原行为,可在 DSSC 中替代铂作为 CE。CoMn2O4/ 石墨烯(x = 0.6)纳米复合材料 DSSC 的 CV 分析表明,在双电极系统中,Ipa 电流为 26.85 mA,而 Ipc 电流为 -27.25 mA。作为电极材料,x = 0.2、0.4 和 0.6 的 CoMn2O4/ 石墨烯的 Rs 值分别为 142.80 Ω、141.33 Ω、135.18 Ω 和 131.18 Ω。利用电荷转移电阻值(Rct = 6.03 Ω cm2)计算出了交换电流密度 J = 2.13 × 10-3 A/cm2,并通过塔菲尔曲线进行了验证。
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来源期刊
Journal of Electronic Materials
Journal of Electronic Materials 工程技术-材料科学:综合
CiteScore
4.10
自引率
4.80%
发文量
693
审稿时长
3.8 months
期刊介绍: The Journal of Electronic Materials (JEM) reports monthly on the science and technology of electronic materials, while examining new applications for semiconductors, magnetic alloys, dielectrics, nanoscale materials, and photonic materials. The journal welcomes articles on methods for preparing and evaluating the chemical, physical, electronic, and optical properties of these materials. Specific areas of interest are materials for state-of-the-art transistors, nanotechnology, electronic packaging, detectors, emitters, metallization, superconductivity, and energy applications. Review papers on current topics enable individuals in the field of electronics to keep abreast of activities in areas peripheral to their own. JEM also selects papers from conferences such as the Electronic Materials Conference, the U.S. Workshop on the Physics and Chemistry of II-VI Materials, and the International Conference on Thermoelectrics. It benefits both specialists and non-specialists in the electronic materials field. A journal of The Minerals, Metals & Materials Society.
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