Sequential transformation of copper to porous copper (I) sulfide as superior electrode for supercapacitor

• Published in: Journal of electroanalytical chemistry (Lausanne, Switzerland) Switzerland), 2022-09, Vol.920, p.116587, Article 116587
• Main Authors: Shaikh, Sajeeda, Doddamani, Jyothi S., Rabinal, M.K.
• Format: Article
• Language: English
• Subjects: Binder free electrodes; Porous copper (I) sulfide; Specific capacitance; Surface modification
• ISSN: 1572-6657; 1873-2569
• DOI: 10.1016/j.jelechem.2022.116587

[Display omitted] •Copper sulfide is low cost, earth abundant and less toxic material.•Simple sequential method to form binder free porous Cu2S electrodes is proposed.•Symmetric supercapacitor of Cu2S is studied as potential material.•Cu2S devices exhibit excellent electrochemical performances.•Specific capacitance of an electrode is close to 1044 Fg−1 at 1.5 Ag−1 is observed. Herein, a highly porous copper (I) sulfide film is formed on the copper surface by employing a sequential chemical transformation. The material is characterized by X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy (XPS), and electrochemical analyses. The present method is simple, versatile, and economic for obtaining binder-free porous and highly conducting electrodes for an efficient supercapacitor. The supercapacitor of these electrodes with 3 M KOH electrolyte gives a high specific capacitance. The estimated specific capacitance is 1044 Fg−1 at 1.5 Ag−1 with retention close to 90% at the end of 3,000 cycles. The proposed method of making these electrodes can be easily scalable for mass production.