Preparation of mulberry-like RuO2 electrode material for supercapacitors

Abstract

As a newly emerging excellent energy storage device, supercapacitors have been widely studied due to their unique advantages. Electrode material is one of the key components that determine the performance of a supercapacitor. Among the various electrode materials of supercapacitors, RuO 2 has attracted great attention in the scientific community due to its high theoretical energy storage capability and excellent stability. However, most RuO 2 materials suffer the problem of low specific surface area, causing a much lower actual capacitance value compared to the theoretical performance of the material. In this work, a mulberry-like RuO 2 electrode material with large specific surface area (159.4 m 2 Ág -1 ) was successfully synthesized by a facial hydrothermal method. The electrochemical characterization has shown that the RuO 2 possesses a high specific capacitance of 400 FÁg -1 at a current density of 0.2 AÁg -1 and good capacitance retention rate of 84.7% after 6000 charge/discharge cycles under a current density of 10 AÁg -1 . The energy densities and power densities of the RuO 2 -AC supercapacitor vary from 25.0 to 11.7 WhÁkg -1 and 160 to 10,560 WÁkg -1 at current density ranging from 0.2 to 10.0 AÁg -1 , respectively.

Transition Metal Oxide Electrode Materials for Supercapacitors: A Review of Recent Developments

“…It has good electrical conductivity, high chemical and thermal stability, as well as a big voltage window. Thus, RuO 2 is called the most ideal pseudocapacitive electrode material [ 40 , 56 ]. However, ruthenium is too expensive to be used for large-scale synthesis of electrode materials.…”

Controllable Intercalated Polyaniline Nanofibers Highly Enhancing the Utilization of Delaminated RuO2 Nanosheets for High‐Performance Hybrid Supercapacitors

“…Overall, the energy and power density of the PANI/RuO 2 -64//AC ASC device are competitive with those of the reported RuO 2 -based and PANI-based devices. [15,27,4,[53][54][55][56][57] In addition, the ACS shows 82.5 % capacity retention after 10000 cycles at 10 A g À 1 (Figure 6e), the degenerative capacity maybe originated from the PANI unstable microstructure during the process of the repeated charge/discharge. Nyquist plots of the device recorded at initial indicated low internal resistance and high ionic accessibility (Figure 6f).…”

A Novel Strategy of Multi‐element Nanocomposite Synthesis for High Performance ZnO‐CoSe2 Supercapacitor Material Development

“…Transition metal oxides, as one class of typical pseudocapacitor materials, such as RuO 2 , [ 11‐12 ] NiO, [ 13 ] Cu 2 O, [ 14 ] MnO 2 , [ 15 ] Co 3 O 4 , [ 16 ] ZnO, [ 17‐19 ] NiCoO 2 , [ 20 ] etc ., have attracted tremendous attentions. Among the various transition metal oxides, ZnO exhibits direct band gap, which may promote a quicker electrochemical response and a higher power density.…”