Mohammad Dashti Najafi , Ali Ehsani , Mehdi Nabatian , Zainab Hamza , Nariman Neekzad
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Comparative electrochemical analyses demonstrated that the composites exhibit remarkable performance with reduced charge transfer resistance. In the three-electrode configuration, FGO-Bi(BDC) and FGO-Bi(BTC) exhibited specific capacitances of 559 and 422 F g<sup>-1</sup> at 1 A g<sup>-1</sup>, respectively. After conducting 10,000 cycles of charge and discharge at 8 A g<sup>-1</sup>, the FGO-Bi(BDC) and FGO-Bi(BTC) electrodes exhibited impressive retention rates of 97.6% and 95.64% for their initial specific capacitance (C<sub>s</sub>). Notably, the three-electrode system's results indicated superior electrochemical performance of the FGO-Bi(BDC) electrode over the FGO-Bi(BTC) electrode. This superiority is attributed to the FGO-Bi(BDC)'s larger specific surface area (SSA) and reduced oxygen concentration. For a more practical assessment, the FGO-Bi(BDC) composite was selected for evaluation in the two-electrode system. The FGO-Bi(BDC)//FGO-Bi(BDC) two-electrode system demonstrated a cyclic stability of 94.2% over 10,000 cycles, attaining a substantial C<sub>s</sub> of 295 F g<sup>-1</sup> at 1 A g<sup>-1</sup>. Moreover, it accomplished a power density of 750 W kg<sup>-1</sup> and an energy density of 34.61 Wh kg<sup>-1</sup>, emphasizing the exceptional electrochemical attributes that position the FGO-Bi(BDC) composite as a promising electrode material for supercapacitors.</p></div>","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":null,"pages":null},"PeriodicalIF":5.5000,"publicationDate":"2024-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Advanced supercapacitor electrodes: Synthesis and electrochemical characterization of graphene oxide-bismuth metal-organic framework composites for superior performance\",\"authors\":\"Mohammad Dashti Najafi , Ali Ehsani , Mehdi Nabatian , Zainab Hamza , Nariman Neekzad\",\"doi\":\"10.1016/j.electacta.2024.144636\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>The primary requirements for a viable supercapacitor electrode material are increased energy density, high specific capacitance, and excellent cycle stability. 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引用次数: 0
摘要
对可行的超级电容器电极材料的主要要求是提高能量密度、高比电容和出色的循环稳定性。将不同的活性材料组合在一起可以达到理想的效果。本研究采用简便的溶热法合成了含有 1,4-苯二甲酸(H2BDC)和 1,3,5-苯三酸酐(H3BTC)有机连接体的两种 Bi-MOFs,并将其键合在氧化石墨烯表面,制备出 FGO-Bi(BTC)和 FGO-Bi(BDC)复合材料。在三电极设置下,通过 GCD、CV 和 EIS 测试评估了这两种电活性化合物的电化学特性。比较电化学分析表明,复合材料在降低电荷转移电阻方面表现出色。在三电极配置中,FGO-Bi(BDC)和 FGO-Bi(BTC)在 1 A g-1 时的比电容分别为 559 和 422 F g-1。在 8 A g-1 下进行 10,000 次充放电循环后,FGO-Bi(BDC) 和 FGO-Bi(BTC)电极的初始比电容(Cs)保持率分别达到 97.6% 和 95.64%,令人印象深刻。值得注意的是,三电极系统的结果表明,FGO-Bi(BDC)电极的电化学性能优于 FGO-Bi(BTC)电极。这种优越性归功于 FGO-Bi(BDC)更大的比表面积(SSA)和更低的氧气浓度。为了进行更实际的评估,我们选择 FGO-Bi(BDC)复合材料在双电极系统中进行评估。FGO-Bi(BDC)//FGO-Bi(BDC) 双电极系统在 10,000 次循环中显示出 94.2% 的循环稳定性,在 1 A g-1 电流条件下达到 295 F g-1 的高 Cs 值。此外,它还实现了 750 W kg-1 的功率密度和 34.61 Wh kg-1 的能量密度,突出了 FGO-Bi(BDC)复合材料作为超级电容器电极材料的卓越电化学特性。
Advanced supercapacitor electrodes: Synthesis and electrochemical characterization of graphene oxide-bismuth metal-organic framework composites for superior performance
The primary requirements for a viable supercapacitor electrode material are increased energy density, high specific capacitance, and excellent cycle stability. The desired outcome may be attained by combining diverse active materials. In this research, two Bi-MOFs with 1,4-benzenetdicarboxylic (H2BDC) and 1,3,5-benzenetricarboxylic (H3BTC) organic linkers were synthesized by facile solvothermal method and bonded on the surface of graphene oxide to produce FGO-Bi(BTC) and FGO-Bi(BDC) composites. The electrochemical characteristics of the two electroactive compounds were evaluated by GCD, CV, and EIS tests in a three-electrode setup. Comparative electrochemical analyses demonstrated that the composites exhibit remarkable performance with reduced charge transfer resistance. In the three-electrode configuration, FGO-Bi(BDC) and FGO-Bi(BTC) exhibited specific capacitances of 559 and 422 F g-1 at 1 A g-1, respectively. After conducting 10,000 cycles of charge and discharge at 8 A g-1, the FGO-Bi(BDC) and FGO-Bi(BTC) electrodes exhibited impressive retention rates of 97.6% and 95.64% for their initial specific capacitance (Cs). Notably, the three-electrode system's results indicated superior electrochemical performance of the FGO-Bi(BDC) electrode over the FGO-Bi(BTC) electrode. This superiority is attributed to the FGO-Bi(BDC)'s larger specific surface area (SSA) and reduced oxygen concentration. For a more practical assessment, the FGO-Bi(BDC) composite was selected for evaluation in the two-electrode system. The FGO-Bi(BDC)//FGO-Bi(BDC) two-electrode system demonstrated a cyclic stability of 94.2% over 10,000 cycles, attaining a substantial Cs of 295 F g-1 at 1 A g-1. Moreover, it accomplished a power density of 750 W kg-1 and an energy density of 34.61 Wh kg-1, emphasizing the exceptional electrochemical attributes that position the FGO-Bi(BDC) composite as a promising electrode material for supercapacitors.
期刊介绍:
Electrochimica Acta is an international journal. It is intended for the publication of both original work and reviews in the field of electrochemistry. Electrochemistry should be interpreted to mean any of the research fields covered by the Divisions of the International Society of Electrochemistry listed below, as well as emerging scientific domains covered by ISE New Topics Committee.