Potentiodynamic polarization assisted phosphorus-containing amorphous trimetal hydroxide nanofibers for highly efficient hybrid supercapacitors. Issue 11 (9th March 2020)

• Record Type: Journal Article
• Authors: Chodankar, Nilesh R.; Rama Raju, Ganji Seeta; Park, Bumjun; Shinde, Pragati A.; Chan Jun, Seong; Dubal, Deepak P.; Huh, Yun Suk; Han, Young-Kyu
• Is Part Of: Journal of materials chemistry. Volume 8:Issue 11(2020)
• Page Start: 5721
• Page End: 5733
• Publication Date: 2020-03-09
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c9ta13225b
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : A potentiodynamic polarization approach is presented for the preparation of battery-type phosphorus-containing amorphous trimetal nickel–ruthenium–cobalt hydroxide nanofibers for high-energy hybrid supercapacitors. Abstract : Due to their high capacity, nickel–cobalt-based cathode materials have attracted significant attention as potential components of hybrid solid-state supercapacitors (HSSCs). However, their poor cycling stability and low rate capability have impeded their implementation. In the present study, a single-step, binder-free potentiodynamic polarization approach is presented for the preparation of battery-type phosphorus-containing amorphous trimetal nickel–ruthenium–cobalt hydroxide (P@NRC-OH) nanofibers on Ni foam for use in high-energy, stable HSSCs. The phosphate dopant and the trimetal-rich electrode surface increase the intrinsic electron conductivity and redox activity and generate a large number of active defects. As a consequence, a P@NRC-OH electrode exhibited enhanced energy storage properties in terms of specific capacity (541.66 mA h g −1 at 3 mA cm −2 ), cycling durability (90.35% over 20 000 cycles), and rate capability (308.64 mA h g −1 at 20 mA cm −2 ). An assembled full-cell HSSC with P@NRC-OH nanofibers as the cathode material and porous activated carbon as the anode material produced a maximum specific energy of 90.02 W h kg −1 at a specific power of 1363 W kg −1 which remained as high as 37.87 W h kg −1 at a power density of 6818.18 W kg −1, with remarkable cycling stability over 15 000 charge–discharge cycles. The proposed approach thus represents a scalable and efficient strategy for the design of electrodes and devices with superior electrochemical performance.