Extended Graphite Supported Flower-like MnO(2) as Bifunctional Materials for Supercapacitors and Glucose Sensing

A simple, efficient, and cost-effective extended graphite as a supporting platform further supported the MnO(2) growth for the construction of hierarchical flower-like MnO(2)/extended graphite. MnO(2)/extended graphite exhibited an increase in sp(2) 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, MnO(2)/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, MnO(2)/extended graphite exhibited a good linear relationship in glucose concentration up to about 5 mM, sensitivity of 43 μA mM(−1)cm(−2), and the limit of detection of 0.081 mM. It is further concluded that MnO(2)/extended graphite could be a good candidate for the future design of synergistic multifunctional materials in electrochemical techniques.