Nanosized nickel hexacyanoferrate modified screen-printed electrodes as flexible supercabattery platforms: Influence of annealing temperatures and supporting electrolytes

Water-insoluble nickel hexacyanoferrate Ni3[Fe(CN)6]2.nH2O (NiHCF) nanoparticles were synthesized via a facile precipitation method in the presence of polyvinylpyrrolidone (PVP) and sodium citrate (SC). Large-scale production cubic NiHCF crystals with an average diameter 35 nm specific surface area (SBET) 452.9 m2/g was shown to be possible. The drop-cast upon screen-printed graphite macroelectrode surfaces (SPEs) allowing flexible energy storage device realised. tunable pore size dual functional reactive sites offered superior capacitances 197.5, 139.35, 356.25, 406.25 F/g 0.1 M KCl, NaCl, NaOH KOH, respectively at current density 5 A/g. highest capacitance found using KOH supporting electrolyte due combination (intercalation/de-intercalation A+) faradaic processes (M2+/M3+) as supercabattery platforms. thermal treatment samples 100, 200, 300 °C performed within oxygen nitrogen atmospheres measured KOH. Interestingly, increases up 546 for annealed 100 reduces 342 if when 200 likely introduction diverse vacancies. Furthermore, NiHCF/SPEs investigated as-symmetric two-electrode system, which revealed 570 NiHCF/SPE exhibited high capability rate, capacitive retention excellent cycling stabilities particularly atmosphere. Thus, platforms can used developing new devices.