NiS-modified zeolite imidazolic acid frame-67 as a bi-functional catalyst: A non-enzymatic lactic acid sensor and supercapacitor

The ZIF-67/NiS composite electrode was prepared on nickel foam (NF) matrix by hydrothermal method . NiS has been widely studied in sensors and supercapacitors due to its good electron transfer ability and good pseudocapacitor performance. Therefore, we prepared ZIF-67/NiS composite electrode. The synthesised ZIF-67/NiS composite electrode not only has certain electrochemical performance of battery type electrode, but also is sensitive to lactic acid (LA), and can be used as a non-enzymatic LA sensor and a dual-function material for supercapacitors . The detection limit of LA concentration in alkaline solution is 0.8 μM, and the sensitivity is 1.34 μA μM −1  cm −2 . Indicating that the electrode has good electrochemical sensing performance. The GCD test results show that the charging capacity of the ZIF-67/NiS is 2.5 times that of the ZIF-67. The ZIF-67/NiS composite has good cyclic performance, and the capacitance retention rate of the ZIF-67/NiS composite is 87% at 10 A/g current density .