PPy-Cr₂O₃ hybrid flexible electrodes (HFEs) have been synthesized by successive ionic layer adsorption and reaction (SILAR) method using flexible aluminum (Al) strips (derived from cold drink cans) as substrates. For the synthesis, 0.1 M pyrrole and 0.02 M K₂Cr₂O₇ dissolved in 0.5 M aqueous H₂SO₄ were used as precursors while the flexible aluminum strips derived from waste cold drink cans were used as substrates. XRD pattern shows the peak at \(50.48^\circ\) indicating the existence of rhombohedral Cr₂O₃ in the hybrid. FTIR spectrum corroborates the formation of hybrid. SEM image exhibits porous morphology with interconnected granules. TEM image depicts the Cr₂O₃ granules of average size 20 nm and PPy globules of average size 50 nm. The liquid–solid contact angle was found to be \(10^\circ 30{\prime }\) indicating the near-superhydrophilic nature of HFE. Cyclic voltammetric (CV) analyses of HFEs have been carried out in each of 20 ml, 0.5 M solutions H₂SO₄, Na₂SO₄, and K₂SO₄. Changes in potential window, redox behavior and hence, the specific capacitance have been observed. The pseudocapacitance of HFE is combined effect of doping–dedoping of PPy matrix with SO₄²⁻ anions as well as redox reaction shown by Cr₂O₃. HFE shows maximum specific capacitance 4246 Fg⁻¹ in K₂SO₄ as measured from CV. HFE shows appreciable stability with 58.20% retention in capacitance even after 1000 cycles.

中文翻译：

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在等摩尔H 2 SO 4，Na 2 SO 4和K 2 SO 4水溶液中SILAR沉积的PPy-Cr 2 O 3的合成和依赖阳离子的循环伏安研究

PPy-Cr ₂ O ₃混合柔性电极（HFEs）是通过连续的离子层吸附和反应（SILAR）方法使用柔性铝（Al）条（源自冷饮罐）作为基材而合成的。对于合成，将溶解在0.5 M H ₂ SO ₄中的0.1 M吡咯和0.02 MK ₂ Cr ₂ O ₇用作前体，而将源自废冷饮料罐的柔性铝条用作底物。X射线衍射图显示在\（50.48 ^ \ circ \）处的峰，表明存在菱形Cr ₂ O ₃在混合动力。FTIR光谱证实了杂化物的形成。SEM图像显示具有相互连接的颗粒的多孔形态。TEM图像描绘了平均大小为20 nm的Cr ₂ O ₃颗粒和平均大小为50 nm的PPy小球。发现液固接触角为\（10 ^ \ circ 30 {\ prime} \），表明HFE具有近超亲水性。在20 ml，0.5 M的H ₂ SO ₄，Na ₂ SO ₄和K ₂ SO ₄溶液中分别进行了HFE的循环伏安（CV）分析。。已经观察到电势窗口，氧化还原行为以及因此的比电容的变化。HFE的假电容是PPy基质与SO ₄ ^2-阴离子的掺杂-去掺杂以及Cr ₂ O ₃所示的氧化还原反应的综合作用。从CV测量，HFE显示出K ₂ SO ₄中的最大比电容4246 Fg ^-1。HFE表现出可观的稳定性，即使在1000次循环后仍保持58.20％的电容。