Chalcogenide solution-mediated activation protocol for scalable and ultrafast synthesis of single-crystalline 1-D copper sulfide for supercapacitors

John Hong, Byung Sung Kim, Seungmo Yang, A. Rang Jang, Young Woo Lee, Sangyeon Pak, Sanghyo Lee, Yuljae Cho, Dongwoo Kang, Hyeon Suk Shin, Jin Pyo Hong, Stephen M. Morris, Seung Nam Cha, Jung Inn Sohn, Jong Min Kim

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

Traditional synthetic routes for transition metal sulfides typically involve solution and thermal-based processes to exploit their favorable pseudo-capacitive properties. However, there is a practical need to develop alternative processes to fabricate metal sulfide electrodes because of the time-consuming processes (>12 h), additional heat-treatment to active reactants, relatively high post-heat-treatment temperature (200-400 °C) and non-scalable nature of existing synthetic routes. Herein, utilizing a solution-based sulfur precursor, one-dimensional single-crystalline Cu 2 S nanostructures have been successfully prepared via a solution-based direct synthesis process within 10 min at room temperature without the need for thermal treatment steps. The fabricated electrode exhibits a capacitance of 750 mF cm -2 at a current density of 2 mA cm -2 . Moreover, the rate capacitance is maintained at about 82.3% as the current density is increased to 40 mA cm -2 , and the capacity retains 90.5% of the initial value after 20000 cycles. Importantly, as this method involves a solution-based formulation it is compatible with roll-to-roll processes, which is promising for mass and scalable production of the electrodes. The synthetic method ensures a facile and efficient approach to fabricating scalable one-dimensional single crystalline Cu 2 S nanostructures, highlighting the uniqueness of the solution-based sulfur activation method.

Original languageEnglish
Pages (from-to)2529-2535
Number of pages7
JournalJournal of Materials Chemistry A
Volume7
Issue number6
DOIs
StatePublished - 2019

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