Extended Graphite Supported Flower-like MnO2 as Bifunctional Materials for Supercapacitors and Glucose Sensing

Abstract

A simple, efficient, and cost-effective extended graphite as a supporting platform further supported the MnO2 growth for the construction of hierarchical flower-like MnO2/extended graphite. MnO2/extended graphite exhibited an increase in sp2 carbon bonds in comparison with that of extended graphite. It can be expected to display better electrical conductivity and further promote electron/ion transport kinetics for boosting the electrochemical performance in supercapacitors and glucose sensing. In supercapacitors, MnO2/extended graphite delivered an areal capacitance value of 20.4 mF cm−2 at 0.25 mA cm−2 current densities and great cycling stability (capacitance retention of 83% after 1000 cycles). In glucose sensing, MnO2/extended graphite exhibited a good linear relationship in glucose concentration up to about 5 mM, sensitivity of 43 μA mM−1cm−2, and the limit of detection of 0.081 mM. It is further concluded that MnO2/extended graphite could be a good candidate for the future design of synergistic multifunctional materials in electrochemical techniques.

Enhanced Cycling Performance of Fe‐doped LiMn2O4 Truncated Octahedral Cathodes for Li‐Ion Batteries

“…The chemical states of the LMO and LFMO samples were characterized using XPS (Figure 4, S6, and S7). In the XPS spectra, the characteristic peaks associated with Mn2p 1/2 and Mn2p 3/2 of Mn 4+ appeared at 654.5 and 643.3 eV, respectively, and those of Mn 3+ appeared at 653.5 and 641.9 eV, respectively (Figure 4a,b) [41,42] …”

Acetate-assisted in situ electrodeposited β-MnO2 for the fabrication of nano-architectonics for non-enzymatic glucose detection

“…Such a well-designed nanostructure with a large surface area can provide more active sites to participate in the glucose redox reaction and build suitable ion intercalation channels to accelerate the fast electron transfer with a faster current response. 22,23 The considerable nanostructure could be constructed using different methods such as hydrothermal, 24,25 atomic layer deposition, 26 spray pyrolysis, 27 and wet chemical techniques. 28 However, the above-mentioned methods generally require huge energy, special conditions, or complex multistep procedures.…”

Electrospun Manganese-Based Metal–Organic Frameworks for MnOx Nanostructures Embedded in Carbon Nanofibers as a High-Performance Nonenzymatic Glucose Sensor

“…Among them, MnO 2 exhibits unique electronic and electrochemical properties that make it an attractive material for glucose sensor fabrication . The material has a high surface area and good conductivity, which enables it to efficiently catalyze the oxidation of glucose molecules . Additionally, the intrinsic redox behavior of MnO 2 (Mn 3+ /Mn 4+ ) allows for the material to act as an electron mediator, facilitating the transfer of electrons between the glucose molecules and the electrode surface .…”