Biocompatible platinum-silver nanoparticles decorated graphene composite for printed supercapacitor with wide potential window operates in human sweat and serum

Microsupercapacitors with physiological fluid as the electrolyte emerge as a promising strategy to develop compact energy storage by avoiding complex encapsulation methods. In this work, we present a highly biocompatible bimetallic decorated reduced graphene oxide as a promising electrode material for printed supercapacitors that operate in human serum and sweat. The preliminary evaluation of the supercapacitor is carried out in phosphate buffered saline and artificial sweat as the electrolyte. Further, human serum and sweat are collected from healthy volunteers and used as electrolytes in supercapacitors . The supercapacitor exhibits high areal capacitance of 42.07 mF cm −2 along with 14.90 μWh cm −2 energy density and 479.0 μW cm −2 power density when using human sweat as the electrolyte at 0.6 mA cm -2 . Similarly, when using serum as the electrolyte, the supercapacitor exhibits 42.10 mF cm −2 areal capacitance along with 14.90 μWh cm −2 energy density and 481 μW cm −2 power density at 0.6 mA cm −2 . The nanocomposite also shows antimicrobial activity and high percentage of cell viability in the presence human monocytic cell line . The superior electrochemical activity in physiological conditions shows the potential application of the developed supercapacitor towards wearable and implantable electronic devices. • Microsupercapacitor operates with physiological fluid as the electrolyte. • Excellent capacitance retention even after 10000 charge discharge cycles. • Capability to meet the power requirements of different biomedical devices. • Superior performance compared to recent reports utilizing conventional electrolytes.