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首页> 外文期刊>Journal of Energy Storage >Pseudocapacitive behaviour of FeS_x grown on stainless steel up to 1.8 V in aqueous electrolyte
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Pseudocapacitive behaviour of FeS_x grown on stainless steel up to 1.8 V in aqueous electrolyte

机译：FeS_x在不超过1.8 V的不锈钢中在水性电解质中生长的伪电容行为

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摘要

Iron sulfide was synthesized for 4 h, 7 h and 12 h by a hydrothermal process directly on stainless steel current collectors. The synthesis time determined the material morphology and electrochemical response. The shortest synthesis time promoted the formation of randomly oriented nanowires that evolved to nanosheets decorated with nanoflakes, organized in a cuboidal-like morphology upon longer synthesis times. XRD, Raman, FTIR and XPS investigations confirmed the formation of FeSx. The electrochemical activity was studied in a potential window ranging from - 0.95 to 0 V and the material obtained after 7 h of synthesis stored the maximum specific capacitance of 730 mF cm(-2) at the current density of 1 mA cm(-2). This material also retained approximately 34% of its initial capacitance at 10 mA cm(-2) and showed very good cycling stability, keeping around 95% of the specific capacitance after 2000 galvanostatic charge-discharge (GCD) cycles. The kinetic analysis of the electrochemical results revealed the predominance of diffusional controlled processes. An asymmetric cell was assembled using FeS,, as negative electrode and carbon nanofoam (CNF) as positive electrode. The FeSx parallel to CNF cell showed enhanced capacitive response in a potential window of 1.8 V in 1 M Na2SO4 electrolyte and delivered specific capacitance of 236 mF cm(-2) at 0.5 mA cm(-2) with good rate capability. The FeSx parallel to CNF cell stored maximum energy density of 0.11 mW h cm(-2) at the power density of 0.45 mW cm(-2). The cell showed very good stability by retaining 83% of the initial capacitance after 2000 cycles of consecutive charge discharge.
机译：通过水热法直接在不锈钢集电器上合成硫化铁4 h，7 h和12 h。合成时间决定了材料的形态和电化学响应。最短的合成时间促进了随机取向的纳米线的形成，该纳米线演化为装饰有纳米薄片的纳米片，在较长的合成时间后以长方体状形态组织。 XRD，拉曼光谱，FTIR和XPS研究证实了FeSx的形成。在-0.95至0 V的电势窗口中研究了电化学活性，合成7小时后获得的材料在1 mA cm（-2）的电流密度下存储了730 mF cm（-2）的最大比电容。 。该材料在10 mA cm（-2）时还保留了约34％的初始电容，并显示出非常好的循环稳定性，在经过2000次恒流充放电（GCD）循环后，保持了约95％的比电容。电化学结果的动力学分析揭示了扩散控制过程的优势。使用FeS作为负极和碳纳米泡沫（CNF）作为正极组装了不对称电池。平行于CNF电池的FeSx在1 M Na2SO4电解质中的1.8 V电位窗口中显示出增强的电容响应，并在0.5 mA cm（-2）时具有236 mF cm（-2）的比电容，具有良好的倍率能力。平行于CNF电池的FeSx在0.45 mW cm（-2）的功率密度下存储的最大能量密度为0.11 mW h cm（-2）。通过连续充电2000次循环后保留了83％的初始电容，该电池表现出非常好的稳定性。

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