Vertically Aligned Micropillar Arrays Coated with a Conductive Polymer for Advanced Pseudocapacitance Energy Storage

Abstract

With the development of high-performance supercapacitors, a conductive polymer (CP)-based pseudocapacitance electrode with good electrical conductivity and low processing costs holds a promising application prospect. As the core component of supercapacitors, the CP electrode with adjustable spacing, a high specific surface area, and a faster ion diffusion path has been extensively investigated. Herein, based on accurate topdown photolithography and electropolymerization approaches, we fabricate a CP-coated vertically aligned micropillar array (MPA) electrode. The electrode presents an overwhelming enhanced areal specific capacitance compared with that of a flat configuration, which is partially ascribed to an increased electroactive surface area, two rapid channels for ion diffusion and electron transfer, and enhanced electric field intensity that is provided by the MPA structure. Based on the fabricated CP-based MPA electrode, an asymmetric supercapacitor is assembled with two thiophene derivatives, presenting a high energy density and excellent cycling stability. A supercapacitor system cascading with three asymmetric supercapacitor devices further demonstrates the practical applications by driving the light-emitting diodes. This work provides a good reference for the further development of CP-based energy storage devices with high energy density and superior cycling stability.

Rare Earth Doping Engineering Tailoring Advanced Oxygen‐Vacancy Co3O4 with Tunable Structures for High‐Efficiency Energy Storage

“…[ 70 ] Compared to the pristine Co 3 O 4 electrode, the RE‐doped Co 3 O 4 electrodes exhibit smaller R ct and R s value, which means that the RE‐doped Co 3 O 4 electrode has better conductive contacts, faster charge transfer kinetics, and electrical response. [ 73 ] And the R ct values from small to large are Eu‐Co 3 O 4 (0.30 ohm), Nd‐Co 3 O 4 (0.33 ohm), Ho‐Co 3 O 4 (0.34 ohm), Er‐Co 3 O 4 (0.35 ohm), Ce‐Co 3 O 4 (0.37 ohm), Y‐Co 3 O 4 (0.41 ohm), Yb‐Co 3 O 4 (0.44 ohm), La‐Co 3 O 4 (0.57 ohm), and pristine Co 3 O 4 (1.18 ohm). The main reason for the significant decrease in R ct value is that the RE doping causes the generation of abundant oxygen vacancies and local distortions, thereby increasing the electrical conductivity.…”

Role of Defects in Graphene-Passivated Ti3C2 MXene for Energy Conversion and Storage Applications: A First-Principles Study

“…Thus, lot of efforts have been devoted to the investigation of abundant and cost-effective alternatives to Pt-based catalysts. Similarly, supercapacitors, which are excessive energy storage devices, exhibit not only energy storage behavior as conventional batteries but also advantageous characteristics such as rapid charging, long lifetimes, safety, high power density, and excellent low-temperature adaptability for applications such as electric vehicles, electronic devices, etc. − It is worth noting that multiple diverse class of materials have been used as electrode materials for supercapacitors such as metal oxides, transition-metal dichalcogenides (TMDs), carbon and their derivatives, transition-metal carbides (TMCs), and other materials. − …”

Self-assembled micropillar arrays via near-field electrospinning

“…5,6 Controlled spacing allows micropillar arrays to be used in electrochemical detection, and optical, biomedical and energy harvesting applications. [7][8][9][10][11][12] Therefore, the fabrication and application of microcolumn arrays are essential for research.…”