Novel nanocomposite of MnFe2O4 and nitrogen-doped carbon from polyaniline carbonization as electrode material for symmetric ultra-stable supercapacitor

Design and Regulation of Novel MnFe2O4@C Nanowires as High Performance Electrode for Supercapacitor

“…Furthermore, the Ragone plot of the assembled MnFe 2 O 4 @C//AC deviceis obtained from calculating the results of GCD plots (Figure 7d). The MnFe 2 O 4 @C//AC device delivers a high energy density of 27 W·h·kg −1 at a power density of 290 W·kg −1 , and remains at a 10 W·h·kg −1 energy density at a high power density of 9300 W·kg −1 , which is higher than the previous reports [15,18,20,33,35]. The outstanding high-rate performance and cycling stability could be due to the following two aspects: (1) the unique porous, core-shell architecture and carbon coating’s mechanical and electrochemical stability, which contributes to fast electron and ion transportation and long-time charge-discharge measurements; (2) the uncontrolled space between core-shell nanoparticles or between the whole nanowires cantolerate the volume change from the fast and long-term electrochemical reactions.…”

“…MnFe 2 O 4 @C (such as graphene, rGO and carbon black, etc.) nanocomposites have been widely studied [17,18,19,20]. Although the electrochemical performances of MnFe 2 O 4 @C composites have been effectively enhanced through tuning the morphology and porous structure, the preparation procedures usually experience some rough or tedious steps, with high energy consumption and toxic or unfriendly effects to the environment.…”

Electrodeposition Polyaniline Nanofiber on the PEDOT:PSS-Coated SiNWs for High Performance Supercapacitors

“…The bands at 1298 cm -1 and 1240 cm -1 are attributed to C-N stretching vibration of secondary aromatic amino structures [42]. The main characteristic band at 791 cm -1 is ascribed to the aromatic N-H stretching vibration of the secondary aromatic amine bending vibration [43]. Furthermore, the two main band at 876 cm -1 and 1121 cm -1 are ascribed to the out-of-plane bending vibration of C-H within the 1,4-disubstituted aromatic ring and the stretching vibration of C-N of the secondary aromatic amine structures bending vibration, respectively [44].…”

“…2c. The two typical characteristic peaks of PANI are at 1590 and 1340 cm -1 ,which are corresponded to C-C stretching of benzenoid structure and C-N stretching of quinoid structure of PANI[43]. The characteristic peak at 1490 cm -1 is ascribed to C=C stretching of quinoid structure of PANI[40].…”

Preparation and Pseudocapacitive Properties of Phosphate Ion-doped MnFe2O4

“…超级电容器具有高功率密度，是新一代高效 的储能装置，其中电极材料对超级电容器的发展 至关重要 [1][2] 。作为重要的电极材料，过渡金属氧 化物因其丰富的资源储量和易于制备等优点而被 广泛研究 [3][4][5] 。 在众多过渡金属氧化物电极材料中， MnFe2O4(MFO)具有高理论容量、环境友好及 低成本等优势，成为关注的重点 [6] 。然而 MFO 仍 然存在着较低的电导率、电化学活性低等不足， 限制了它的实际应用 [7][8] 。近年来，为了改善这些 问题，人们通过采用复合导电性高的材料来提高 MFO 的电化学性能。 例如，Lei 等 [7] 合成了 MnFe2O4@C，在 1 A/g 电流密度下比容量可达到 605 F/g； Tran 等 [5] 报道了 MFO 复合 PPy 电极材料， 在 0.5 A/g 电流密度下达到 66.1 F/g 的比容量。尽 管有了这些进展，但要实现对 MFO 的实际应用仍 然需要进一步努力。 近期，Lu 等 [9] 报道了磷酸根功能化的 Co3O4 纳米阵列， 降低了 Co3O4 在电化学过程中电荷转移 的阻力、增加了表面活性位点，进一步提高了材料 的反应活性和赝电容性能。Yu 等 [10] 报道了氮掺杂 的 Co3O4 纳米阵列，通过磷酸根离子功能化提升 了材料的电化学性能；Bu 等 [11] 报道了掺杂磷的 Fe2O3 材料，通过掺杂磷增加了材料的活性位点， 提升了材料的催化性能。Kang 等 [12] 报道了磷酸根 掺杂 TiO2 纳米阵列材料，通过掺杂改善了材料的 循环稳定性。这些研究表明：通过引入磷酸根， 构建材料的缺陷并产生足够的电化学活性位点， 可以改善并提升材料的电化学性能 [13][14][15] [7,[24][25][26][27]…”