Mille-Crêpe-like Metal Phosphide Nanocrystals/Carbon Nanotube Film Composites as High-Capacitance Negative Electrodes in Asymmetric Supercapacitors

• DOI: 10.1021/acsaem.0c00263
• Publication Date: 2020-04-27T22:53:29Z
• Authors: Nan Zhang; Junyuan Xu; Bin Wei; Junjie Li; Isilda Amorim; Rajesh Thomas; Sitaramanjaneya M...; Zhongchang Wang; Weiya Zhou; Sishen Xie; Lifeng Liu
• Keywords: Phosphide; Current collector; Bimetallic strip

Transition metal phosphides (TMPs) are emerging as high-performance and promising electrode materials for use in asymmetric supercapacitors (ASCs). Herein, we demonstrate that cobalt phosphide (CoP) nanocrystals supported on carbon nanofibers (CoP/CNF) can serve negative ASCs show outstanding specific capacitance 748 F g–1 at 2 A superior long-term cycle stability, outperforming conventional carbon-based nearly all TMP-based reported previously. binder-free mille-crêpe-like is fabricated by loading CoP/CNF onto an ultrathin, interconnected nanotube (CNT) film current collector, followed folding the multiple times, which exhibits a high total mass (active collector) based of 200.0 1 g–1, due to lightweight CNT collector. Furthermore, fabricate all-phosphide ASC (APASC) using CoP/CNF/CNT NiP/CNF/CNT positive electrode, delivers 163.8 shows excellent long-cycle stability up 50000 cycles. The APASC's be further improved 209 if bimetallic CoNiP/CNF/CNT used. APASC holds substantial promise next generation energy storage systems.