Journal
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
Volume 833, Issue -, Pages 105-112Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jelechem.2018.11.028
Keywords
Co-electrodeposition; Sulfur doped nickel cobalt layered double hydroxide; Nanosheet arrays; Hydrogen evolution reaction; Battery-type electrode
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Funding
- National Research Foundation of Korea (NRF) - Ministry of Science and ICT (MSIT) of Korea government [2017R1C1B5076286]
- Priority Research Centers Program [2014R1A6A1031189]
- Korean Ministry of Education, Science and Technology [2012M3A7B4049675]
- National Research Foundation of Korea [2017R1C1B5076286] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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In this work, sulfur doped nickel cobalt layered double hydroxide nanosheet arrays are fabricated on a stainless steel (S-LDH/SS) substrate by simple electrodeposition technique for electrocatalytic hydrogen evolution reaction (HER) and supercapacitor applications. The surface morphology and chemical composition of S-LDH/SS are accessed by field emission electron microscopy (FE-SEM) with energy dispersive X-ray spectroscopy (EDX) and X-ray photoelectron spectroscopy (XPS), respectively. Remarkably, the fabricated S-LDH/SS electrode requires low overpotential of -0.38 V vs. RHE to accomplish a current density of -10 mA cm(-2) with a less Tafel slope of -69 mV dec(-1) for HER in aqueous KOH. Further, the tailored S-LDH/SS behaves like a battery-type electrode and delivers maximum specific capacity of 344 C g(-1) (95.5 mAh g(-1)) at scan rate of 5 mV s(-1), which possess excellent cyclic stability and capacity retention. The S-LDH/SS comprised by two types of active catalytic sites along with anions furnish an excellent conductivity, which improving the mass and ionic transportations. Hopefully, exceptional electrochemical interpretation substantiates that this S-LDH/SS electrode might be a favorable material for the energy conversion and storage applications.
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