Smart Energy Storage: W18O49 NW/Ti3C2Tx Composite ‐Enabled All Solid State Flexible Electrochromic Supercapacitors

Efficient electrochromic energy storage devices are essential for energy-saving applications. A stable W18O49 NW/Ti3C2Tx composite electrode, with 15 layers, is utilized to form a bifunctional symmetric electrochromic supercapacitor, demonstrating substantial energy and power densities with excellent stability over 4000 cycles. The device also exhibits mechanical flexibility over 100 bending cycles and fast color switching below 7  s, promising practical applications. AbstractDeveloping a highly efficient electrochromic energy storage device with sufficient color fluctuation and significant electrochemical performance is highly desirable for practical energy-saving applications. Here, to achieve a highly stable material with a large electrochemical storage capacity, a W18O49 NW/Ti3C2Tx composite has been fabricated and deposited on a pre-assembled Ag and W18O49 NW conductive network by Langmuir –Blodgett technique. The resulting hybrid electrode composed of 15 layers of W18O49 NW/Ti3C2Tx composite exhibits an areal capacitance of 125  mF cm−2, with a fast and reversible switching response. An optical modulation of 98.2% can be maintained at a current density of 5  mA cm−2. Using this electrode, a bifunctional symmetric electrochromic supercapacitor device having an energy density of 10.26  µWh cm−2 and a power density of 0.605  mW cm−2 is fabricated, with high capacity retention and full columbic efficiency over 4000 charge-discharge cycles. Meanwhile, the...

Source: Small - March 29, 2024 Category: Nanotechnology Authors: Muhammad Hassan, Pingping Li, Ju Lin, Zihao Li, Muhammad S. Javed, Zhengchun Peng, Kemal Celebi Tags: Research Article Source Type: research