TY - JOUR
T1 - Interface engineering of MoS2 nanopetal grown on carbon nanofibers for the electrocatalytic sensing of mercury (II) and efficient hydrogen evolution
AU - Ezhil Vilian, A. T.
AU - Ranjith, Kugalur Shanmugam
AU - Hwang, Seung Kyu
AU - Bhaskaran, Gokul
AU - Alhammadi, Munirah
AU - Park, So Young
AU - Huh, Yun Suk
AU - Han, Young Kyu
N1 - Publisher Copyright:
© 2022 Elsevier Ltd
PY - 2022/12
Y1 - 2022/12
N2 - Deep concerns about the hazards to human health posed by the misuse of Hg2+ constitute a considerable scientific challenge. To address these concerns, we coated electrospun carbon nanofibers (CNFs) with petal-like MoS2 grown and followed this with a facile hydrothermal treatment using thiourea (TA), thioacetamide (TAA), or L-cysteine (L-Cys) as sulfur precursors. The proposed MoS2-TA-CNF screen-printed carbon electrode (SPE) showed excellent electrocatalytic performance for the electrochemical detection of mercury ions (Hg2+) and hydrogen evolution reaction (HER) applications in acidic medium. Interestingly, MoS2-TA-CNFs have inherent electrocatalytic behavior and lower charge transfer kinetics (Rct = 46 Ω), higher anodic signal intensities, and lower anodic signal potentials than MoS2-L-Cys–CNF–SPEs or MoS2-TAA–CNF–SPEs. The proposed electrocatalyst had an ultra-low detection limit (0.16 nM) and a linear range of 5–125 nM with excellent sensitivity (4.152 μA nM-1 cm-2) for the one-step detection of Hg2+. Furthermore, square wave voltammetry (SWV) showed the anodic peak of Hg2+ was at 0.04 V (vs. Ag/AgCl). The practicability of the designed sensor was confirmed by on-site Hg2+ monitoring in samples of river, sea, and industrial water and provided satisfactory recoveries from 86.6% to 110.9% with RSDs below 5% as determined by ICP-OES. Furthermore, optimized MoS2-TA–CNF–SPEs had a low overpotential of only 146 mV and achieved at10 mA/cm2, a Tafel slope of 72.4 mV/dec, and better electron transfer resistance in HER than MoS2-L-Cys-CNF or MoS2-TAA–CNF–SPEs in acidic media over 25 h. The devised bifunctional electrocatalyst provides a unique novel means of rapidly monitoring Hg2+ concentrations in water and conducting hydrogen evolution reactions as alternatives to noble metal-based electrocatalysts.
AB - Deep concerns about the hazards to human health posed by the misuse of Hg2+ constitute a considerable scientific challenge. To address these concerns, we coated electrospun carbon nanofibers (CNFs) with petal-like MoS2 grown and followed this with a facile hydrothermal treatment using thiourea (TA), thioacetamide (TAA), or L-cysteine (L-Cys) as sulfur precursors. The proposed MoS2-TA-CNF screen-printed carbon electrode (SPE) showed excellent electrocatalytic performance for the electrochemical detection of mercury ions (Hg2+) and hydrogen evolution reaction (HER) applications in acidic medium. Interestingly, MoS2-TA-CNFs have inherent electrocatalytic behavior and lower charge transfer kinetics (Rct = 46 Ω), higher anodic signal intensities, and lower anodic signal potentials than MoS2-L-Cys–CNF–SPEs or MoS2-TAA–CNF–SPEs. The proposed electrocatalyst had an ultra-low detection limit (0.16 nM) and a linear range of 5–125 nM with excellent sensitivity (4.152 μA nM-1 cm-2) for the one-step detection of Hg2+. Furthermore, square wave voltammetry (SWV) showed the anodic peak of Hg2+ was at 0.04 V (vs. Ag/AgCl). The practicability of the designed sensor was confirmed by on-site Hg2+ monitoring in samples of river, sea, and industrial water and provided satisfactory recoveries from 86.6% to 110.9% with RSDs below 5% as determined by ICP-OES. Furthermore, optimized MoS2-TA–CNF–SPEs had a low overpotential of only 146 mV and achieved at10 mA/cm2, a Tafel slope of 72.4 mV/dec, and better electron transfer resistance in HER than MoS2-L-Cys-CNF or MoS2-TAA–CNF–SPEs in acidic media over 25 h. The devised bifunctional electrocatalyst provides a unique novel means of rapidly monitoring Hg2+ concentrations in water and conducting hydrogen evolution reactions as alternatives to noble metal-based electrocatalysts.
KW - Contaminants
KW - Electrocatalysts
KW - Electrocatalytic performance
KW - Electrochemical sensor
KW - Mercury ion
KW - Square-wave voltammetry
UR - http://www.scopus.com/inward/record.url?scp=85138462238&partnerID=8YFLogxK
U2 - 10.1016/j.mtnano.2022.100262
DO - 10.1016/j.mtnano.2022.100262
M3 - Article
AN - SCOPUS:85138462238
SN - 2588-8420
VL - 20
JO - Materials Today Nano
JF - Materials Today Nano
M1 - 100262
ER -