Abstract:The development of multifunctional electrocatalysts with
rich resources,
excellent performance, and stability is necessary for water splitting
to achieve sustainable hydrogen and oxygen production. Herein, we
report the preparation of a bifunctional coral-like nanostructured
electrocatalyst (p-MoS2/NiS2) by in situ vulcanization
of polymeric sulfur with a MoO3/Ni as the precursor. It
is exciting that the whole preparation process of the electrocatalyst
can be completed in a few hours. The as-fabricated multime… Show more
“…9H5E-CF 9H5E-CC showed high stability with negligible voltage change. Additionally, compared with the reported bifunctional catalysts for HER, OER, and overall water splitting in alkaline electrolytes, a competitive overpotential of 142 mV (η 10 ) for HER, 294 mV (η 50 ) for OER, and 1.88 V (at 50 mA cm −2 ) for overall water splitting were achieved for the MoO 3 -NiS x catalyst, as shown in Table S4 [39][40][41][42][43][44][45][46][47][48][49][50][51].…”
Section: Resultsmentioning
confidence: 99%
“…The following supporting information can be downloaded at: https:// www.mdpi.com/article/10.3390/catal13111426/s1, Figure S1 S1: Listing of the experimental parameters for fabricating the samples; Table S2: R s and R ct values of 9H5E-CC, 9H-CC, and 9H15-CC; Table S3: R s and R ct values of 9H5E-CF, 9H-CF, and 9H15-CF; Table S4: Comparison of the water splitting performance of the catalyst in this study with that of other reported bifunctional catalysts in 1 M KOH. References [39][40][41][42][43][44][45][46][47][48][49][50][51] are cited in the Supplementary Materials.…”
The hydrothermal method is a frequently used approach for synthesizing HER electrocatalysts. However, a weak tolerance to high temperature is an intrinsic property of carbon cloth (CC) in most situations, and CC-based catalysts, which require complex technological processes in low-temperature environments, exhibit weak stability and electrochemical performance. Hence, we provide a new solution for these issues. In this work, MoO3-NiSx films of 9H5E-CC catalysts are synthesized, first through electrodeposition to form Ni particles on CC and then through a hydrothermal reaction to reform the reaction. The advantages of this synthetic process include mild reaction conditions and convenient operation. The obtained MoO3-NiSx film presents excellent catalytic activity and stability for HER. MoO3-NiSx film requires only a low overpotential of 142 mV to drive 10 mA cm−2 for HER in 1.0 m KOH, and the obtained 9H5E-CF film only needs 294 mV to achieve 50 mA cm−2 for OER. Remarkably, they also show excellent OER, HER, and full water splitting long-term electrochemical stability, maintaining their performance for at least 72 h. This work can be expanded to provide a new strategy for the fabrication of stable, high-performing electrodes using simple, mild reaction conditions.
“…9H5E-CF 9H5E-CC showed high stability with negligible voltage change. Additionally, compared with the reported bifunctional catalysts for HER, OER, and overall water splitting in alkaline electrolytes, a competitive overpotential of 142 mV (η 10 ) for HER, 294 mV (η 50 ) for OER, and 1.88 V (at 50 mA cm −2 ) for overall water splitting were achieved for the MoO 3 -NiS x catalyst, as shown in Table S4 [39][40][41][42][43][44][45][46][47][48][49][50][51].…”
Section: Resultsmentioning
confidence: 99%
“…The following supporting information can be downloaded at: https:// www.mdpi.com/article/10.3390/catal13111426/s1, Figure S1 S1: Listing of the experimental parameters for fabricating the samples; Table S2: R s and R ct values of 9H5E-CC, 9H-CC, and 9H15-CC; Table S3: R s and R ct values of 9H5E-CF, 9H-CF, and 9H15-CF; Table S4: Comparison of the water splitting performance of the catalyst in this study with that of other reported bifunctional catalysts in 1 M KOH. References [39][40][41][42][43][44][45][46][47][48][49][50][51] are cited in the Supplementary Materials.…”
The hydrothermal method is a frequently used approach for synthesizing HER electrocatalysts. However, a weak tolerance to high temperature is an intrinsic property of carbon cloth (CC) in most situations, and CC-based catalysts, which require complex technological processes in low-temperature environments, exhibit weak stability and electrochemical performance. Hence, we provide a new solution for these issues. In this work, MoO3-NiSx films of 9H5E-CC catalysts are synthesized, first through electrodeposition to form Ni particles on CC and then through a hydrothermal reaction to reform the reaction. The advantages of this synthetic process include mild reaction conditions and convenient operation. The obtained MoO3-NiSx film presents excellent catalytic activity and stability for HER. MoO3-NiSx film requires only a low overpotential of 142 mV to drive 10 mA cm−2 for HER in 1.0 m KOH, and the obtained 9H5E-CF film only needs 294 mV to achieve 50 mA cm−2 for OER. Remarkably, they also show excellent OER, HER, and full water splitting long-term electrochemical stability, maintaining their performance for at least 72 h. This work can be expanded to provide a new strategy for the fabrication of stable, high-performing electrodes using simple, mild reaction conditions.
“…37,38 Constructing a heterojunction between MoS 2 and other catalysts is a highly effective strategy to enhance the electrocatalytic performance of OWS. 39,40 The formation of a heterojunction induces band bending at the interface due to differences in Fermi energy levels, resulting in electron redistribution and the creation of an intrinsic electric field. This contributes to the acceleration of electron migration between interfaces and the formation of new active sites.…”
Electrochemical water splitting prompted by organic molecules presents a competitive prospect for implementing energy-efficient hydrogen evolution and alleviating organic-rich water pollution. In this work, we fabricated a heterojunction of CoFe-layered double hydroxide (CoFe LDH) needles on MoS 2 / Ni 3 S 2 /nickel foam (NF) nanoarrays (CoFe LDH/MoS 2 /Ni 3 S 2 / NF) by forming a Schottky interface and a p−p heterojunction interface. The prepared CoFe LDH/MoS 2 /Ni 3 S 2 /NF exhibits superior electrocatalytic activities with low potentials to drive 50 mA cm −2 for the hydrogen evolution reaction (HER, 0.098 V vs the reversible hydrogen electrode (RHE)), oxygen evolution reaction (OER, 1.507 V vs RHE), urea oxidation reaction (UOR, 1.460 V vs RHE), and ethanol oxidation reaction (ETOR, 1.484 V vs RHE). Meanwhile, the electrode can maintain robust stability in these reactions. The enhanced electrocatalytic activities result from the increased active sites and the acceleration of charge transfer caused by the built-in electric fields. Moreover, the prepared catalyst also exhibits remarkable catalytic performance in two-electrode electrocatalytic systems of KOH, KOH assisted by urea, and KOH assisted by polylactic acid. This work offers a rational method for designing efficient electrocatalysts via combining heterojunctions to effectively generate hydrogen energy and treat organic pollutants.
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