Preparation of Indigo Electrocatalytic Hydrogenation Reduction Electrode and Its Dyeing Applications
Since traditional indigo dyeing requires the reduction of reductants into cryptochromes for dyeing,which generates a large amount of sulphur-containing wastewater,the electrocatalytic hydrogen reduction technology is proposed,which is energy-saving and environmentally friendly as well as precise and controllable.In this paper,Ni@S electrodes with different substrates,such as nickel foam,copper foam,carbon felt and stainless steel mesh,were prepared by electrodeposition using sodium thiosulfate as the sulphur source,and their morphology structures and electrochemical properties were characterised.The Ni-Ni@S electrochemically active area is calculated to be maximum 1 048.25 cm2,the Tafel slope is minimum 177.5 mV/dec,the overpotential is minimum 145.8 mV,the current density of 10.00 mA/cm2 can be achieved at low potential,and the charge transfer resistance is minimum 279 Ω for the electrical impedance test,which is the best performing electrode substrate among the four electrodes.The electrocatalytic hydrogenation reduction dyeing is carried out with the Ni-Ni@S electrode as the cathode,and the comparison with the fabric samples obtained from the reduction dyeing with the traditional insurance powder show that the Ni-Ni@S electrode could reduce indigo and top-dye the cotton fabric,and the K/S value is positively correlated with the dye concentration,which is comparable to the results of the dyeing with the traditional insurance powder.
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