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Fabrication of Porous Mesh‐Like FeCo 2 S 4 Nanosheet Arrays on Ni Foam for High Performance all Solid‐State Supercapacitors and Water Splitting
Author(s) -
Ma Dandan,
Lv Minglian,
Shen Yu,
Zhu Yongqiang,
Wang Fumin,
Zhang Xubin
Publication year - 2019
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201803107
Subject(s) - overpotential , nanosheet , materials science , supercapacitor , water splitting , electrode , current density , capacitance , anode , electrocatalyst , chemical engineering , oxygen evolution , nanotechnology , electrochemistry , chemistry , catalysis , biochemistry , physics , photocatalysis , quantum mechanics , engineering
Porous mesh‐like FeCo 2 S 4 nanosheet arrays on Ni foam (NF) have been prepared by a two‐step hydrothermal approach and employed as electrodes for supercapacitors and efficient bifunctional electrocatalysts for water splitting. FeCo 2 S 4 /NF exhibits ultrahigh areal capacitance of 7.37 F cm −2 at current density of 5 mA cm −2 and achieves good cycling stability retaining 92% capacitance after 3000 cycles at 10 mA cm −2 . Symmetric solid‐state device of FeCo 2 S 4 /NF as positive and negative electrodes delivers a remarkable energy density of 19.12 W h kg −1 (434.61 W kg −1 ). Furthermore, FeCo 2 S 4 /NF electrode delivers a low overpotential of 155 mV at a hydrogen evolution reaction (HER) current density of 10 mA cm −2 and shows no obvious attenuation after stability test for 100,000 s in 1 M KOH solution. While a low overpotential of 234 mV at 50 mA cm −2 for oxygen evolution reaction (OER) can be demonstrated in alkaline environment as an anode electrocatalyst. FeCo 2 S 4 /NF shows excellent activity toward overall water splitting with 10 mA cm −2 by applying just 1.405 V across the two electrodes. Hence, the porous mesh‐like FeCo 2 S 4 nanosheet arrays on Ni foam are promising electrode materials for supercapacitor application and water splitting.