Characterization of MnO2 and AgNWs Co-Doped into an Activated Carbon Thin Film Electrode for Supercapacitors

Abstract

In this study, the properties of supercapacitors were improved by doping nanomaterials. Transition metal oxides (i.e., MnO 2 ) with Faraday's reduction-oxidation (redox) reaction and silver nanowires (AgNWs) with high conductivity were doped into activated carbon based material to prepare thin-film electrodes. The results indicated that doping with AgNWs can effectively improve the conductivity of the thin film electrode. A conductive network was constructed between activated carbon and MnO 2 , and the optimal balance between conductivity and specific surface area was achieved through suitable doping. Thus, the electrochemical efficacy of the developed supercapacitor was effectively improved, and its specific capacitance increased from 240.14 F/g before doping to 1020.91 F/g (by 3.25 times) after doping. In addition, the prepared thin-film electrodes had favorable reproducibility at different voltage scan rates. Electrochemical impedance spectroscopy indicated a noticeable decrease in the charge transfer resistance of the thin-film electrodes from 1.46 Ω before doping to 0.66 Ω after doping. The doping of the two nanomaterials preserved their respective advantages and created a synergistic effect. The doping of transition metal oxides with metal AgNWs has applications in thin-film preparation for different types of supercapacitors, thereby enhancing the capacitance effect.

Exploring Zn doped η′‐Cu6Sn5: Structural stability, fracture toughness and thermal conductivity

“…Table 1 shows the advanced crystal structure parameters, along with the relevant experimental values [20] and calculated theoretical results [21–23]. It is found that there is a high agreement between the values, which indicates that this computational effort is meaningful.…”

“…Table 1 shows the heats of formation for seven compounds, along with the theoretical values [21–24] and experimental results [25]. When Zn is doped into η ′‐Cu 6 Sn 5 , the predicted heats of formation are all negative, indicating that η ′‐Cu 6 Sn 5 ‐based IMCs are all stable.…”

“…Table 1 shows the heats of formation for seven compounds, along with the theoretical values [21][22][23][24] and experimental results [25]. When…”

A Review of Fabrication Technologies for Carbon Electrode-Based Micro-Supercapacitors

“…Electrodes of activated carbon fibres with well-aligned tin oxynitride nanorod arrays have shown a high specific capacitance of 673 F/g at 1 A/g and a cycling stability of 99% at 5 A/g for 2000 cycles in 1 M H 2 SO 4 electrolyte [74]. Activated carbon was doped with MnO 2 and silver nanowires in order to improve the conductivity of the thin film electrode, resulting in a specific capacitance of 1021 F/g, a 325% increase from the undoped activated carbon [75]. Another recent study presented the direct fabrication of hierarchical porous carbon/silicon carbide (HPC/SiC) composite from bamboo waste raw biomass via a facile method [76].…”

Bibliometric study on the application of manganese dioxide in environmental catalysis worldwide from 1991 to 2021

“…Since Antonsson et al 1 selectively formed substituted cyclopentane derivatives in the presence of Pd(OAc) 2 -MnO 2 -benzoquinone as the catalyst in 1986, manganese dioxide (MnO 2 ) has been capturing more and more attention worldwide. As an important environment-benign transition metal oxide, MnO 2 has the advantages of abundant reserves, diverse morphology, rich crystalline forms and controllable grain sizes, and has a wide range of promising applications in electrode materials, [2][3][4] electrochromism, 5 catalysis, [6][7][8] biosensors, [9][10][11] etc.…”