Electrochemical Synthesis of 3D Porous Co(OH)_2/ErGO Nanoflake for High-Performance Supercapacitor and Non-Enzymatic Glucose Sensor

摘要

Co(OH)_2 is a promising electrochemical material owing to its high theoretical specific capacitance, low cost and eco-friendliness. However, the poor conductivity hinders its application. In this work, 3D porous Co(OH)_2/ErGO nanoflake vertically grown on the surface of Ni foam (NF) through a facile two-step electrodeposition approach, avoiding the need for binders and conducting agents. When used for supercapacitors (SCs), the Co(OH)_2/ErGO/NF electrode exhibits a high specific capacitance of 857.1 F g~(-1) at a current density of 2 A g~(-1), and a favorable cycling stability with 85.0% retention even at 12 A g~(-1) after 2000 cycles. Additionally, serving as a non-enzymatic sensor, the 3D Co(OH)_2/ErGO/NF electrode exhibits remarkable electrocatalytic activity towards glucose oxidation with a high sensitivity of 10.2 mA mM~(-1) cm~(-2). Owing to its favorable electrochemical performance, the 3D Co(OH)_2/ErGO/NF electrode with porous structure has great potential applications in the fields of electrochemical SCs and non-enzymatic glucose sensors.