Pulse Electrodeposition of Polyaniline/Mn-Fe Binary Metal Hydroxide Composite Cathode Material for a Zn-Ion Hybrid Supercapacitor.

Tung, Doan Thanh; Nguyet, Ha Minh; Dung, Ngo Thanh; Dung, Hoang Tran; Yen, Nguyen Thi; Thanh, Ngo Ba; Hong, Phan Ngoc; Van Hoi, Pham; Van Quynh, Nguyen; Minh, Phan Ngoc; Lu, Le Trong

Rechargeable aqueous zinc-ion hybrid supercapacitors and zinc-ion batteries are promising as safe energy storage systems because they combine the advantages of the high energy density of batteries and high power density of supercapacitor. This paper presents the elaboration of polyaniline (PANi)/Mn-Fe binary metal hydroxide (MnFe-BMH) composite cathode material and Zn anode for a Zn-ion hybrid supercapacitor (ZHSC) by electrochemistry. Two electrochemical techniques (voltage pulse and stepwise voltage) are carried out to perform different morphologies and structures of material modifying the cathode and anode electrodes. The ZHSC is packaged with a gel electrolyte solution of ZnSO4 1M and MnSO4 0.1M. Electrochemical performance of electrode materials and full-cell capacitors are studied by cyclic voltammetry, galvanostatic charge/discharge, and electrochemical impedance spectroscopy measurements. The composite material for electrode modification has an outstanding specific capacitance of 470.3 F/g (167 Wh/kg) at a scan rate of 5 mV/s. Furthermore, this as-prepared electrode also shows excellent cycling stability with 94.6% capacity retention after 11,602 cycles. This demonstrates an improvement in endurance and energy density compared to the industrial SC electrodes.

COMPOSITE materials; ENERGY storage; METALLIC composites; SUPERCAPACITOR electrodes; ENERGY density; BINARY metallic systems; ELECTRODE performance; ZINC ions

Journal of Electronic Materials, 2021, Vol 50, Issue 8, p4407

0361-5235

Academic Journal

10.1007/s11664-021-08959-9