用于储能器件的 Bi2O3、Fe2O3 和 BiFeO3 纳米材料的相和晶体结构控制合成,ACS Applied Nano Materials

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用于储能器件的 Bi2O3、Fe2O3 和 BiFeO3 纳米材料的相和晶体结构控制合成
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2022-10-07 , DOI: 10.1021/acsanm.2c03026
Arpan Kumar Nayak ₁ , Thamizharasan Gopalakrishnan ₁

Affiliation

控制纳米材料的相和晶体结构是湿化学方法中的一项具有挑战性的任务，对材料性能具有显着的重要性。在此，我们展示了一种简便的溶胶-凝胶法合成 Bi ₂ O ₃、Fe ₂ O ₃、BiFeO ₃、Bi ₃₆ Fe ₂ O ₅₇、第二相和BiFeO ₃的混合相（Bi ₂₅ FeO ₄₀和Bi ₂ Fe ₄ O ₉) 通过调整摩尔浓度、煅烧温度和持续时间等参数。此外，所有电极材料都被证明可用于超级电容器（SC）应用。与在 3 M KOH 电解质下的所有其他电极相比，纯相 BiFeO ₃纳米颗粒在 1 A/g 的电流密度下显示出 253 F/g 的最高比电容。BiFeO ₃纳米粒子较高的比电容归因于其较高的表面积、纯ABO ₃结构和较低的电荷转移电阻。此外，BiFeO ₃纳米颗粒还在中性电解质（1 M Na ₂ SO ₄) 并发现其比电容比碱性电解质 (3 M KOH) 低 3.7 倍。合成后的活性电极的电动研究说明了最大的电容参与来存储总电荷。BiFeO ₃纳米颗粒在不同电流密度下连续 1100 次恒电流充放电循环后显示出出色的稳定性，保留率为 99.02%。_{此外，使用BiFeO 3}纳米粒子制造了固态对称SC器件（SSD）。该器件在电流密度为 1 A/g 时的最大能量密度为 17.01 Wh/kg，在电流密度为 10 A/g 时的功率密度为 7.2 kW/kg。BiFeO ₃SSD 在 5000 次循环后表现出 88% 的优异电容保持率，表明它可能是一种很有前途的电极材料，可在储能装置中实际应用。

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Phase- and Crystal Structure-Controlled Synthesis of Bi2O3, Fe2O3, and BiFeO3 Nanomaterials for Energy Storage Devices

Controlling the phase and crystal structure of nanomaterials is a challenging mission in a wet chemical method and has remarkable importance to the materials properties. Herein, we demonstrate a facile sol–gel method to synthesize Bi₂O₃, Fe₂O₃, BiFeO₃, Bi₃₆Fe₂O₅₇, secondary phase, and mixed phase of BiFeO₃ (Bi₂₅FeO₄₀ and Bi₂Fe₄O₉) by tailoring the parameters such as molar concentration, calcination temperature, and duration. Further, all the electrode materials were demonstrated for supercapacitor (SC) application. The pure-phase BiFeO₃ nanoparticles show a highest specific capacitance of 253 F/g at a current density of 1 A/g compared to all other electrodes under a 3 M KOH electrolyte. The higher specific capacitance of BiFeO₃ nanoparticles is ascribed to their higher surface area, pure ABO₃ structure, and lower charge-transfer resistance. Moreover, the BiFeO₃ nanoparticles were also tested under a neutral electrolyte (1 M Na₂SO₄) and found to have 3.7 times lower specific capacitance compared to the alkaline electrolyte (3 M KOH). The electrokinetic study of the as-synthesized active electrodes illustrates the maximum capacitive involvement to store the overall charge. The BiFeO₃ nanoparticles display outstanding stability with a retention rate of 99.02% after 1100 consecutive galvanostatic charge–discharge cycles at various current densities. Moreover, a solid-state symmetric SC device (SSD) was fabricated using BiFeO₃ nanoparticles. The device delivered a maximum energy density of 17.01 W h/kg at a current density of 1 A/g and a power density of 7.2 kW/kg at a current density of 10 A/g. The BiFeO₃ SSD showed an excellent capacitive retention rate of 88% after 5000 cycles, suggesting that it could be a promising electrode material for practical application in energy storage devices.

更新日期：2022-10-07

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