Reverse Microemulsion‐Assisted Synthesis of NiCo<sub>2</sub>S<sub>4</sub> Nanoflakes Supported on Nickel Foam for Electrochemical Overall Water Splitting

Yu, Jing; Lv, Chunxiao; Zhao, Lu; Zhang, Lixue; Wang, Zonghua; Liu, Qingyun

doi:10.1002/admi.201701396

Cited by 53 publications

(40 citation statements)

References 51 publications

(55 reference statements)

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“…A cell voltage of 1.60 V was obtained to afford the current density of 10 mA cm −2 at room temperature (25 °C), which is only 370 mV higher than the value of 1.23 V (theoretical reversible voltage for water‐splitting reaction). Such a low catalytic overpotential of N‐NiMoO 4 /NiS 2 is 10, 50, and 80 mV, 100 and 240 mV, lower than the values of NiCo 2 S 4 /NF (1.61 V), NiCo 2 O 4 (1.65 V), Ni 5 P 4 Co 1 Mn 1 CH (1.68 V), (1.70 V), and NiCo 2 O 4 /NF (1.84 V), respectively, thus demonstrating N‐NiMoO 4 /NiS 2 as a highly efficient bifunctional catalyst for the overall water‐splitting electrolyzer. In adidition, the kinetics and thermodynamics can be greatly improved with the increase in temperature, showing a much lower voltage of 1.55 V (45 °C) and 1.50 V (65 °C) at the current density of 10 mA cm −2 .…”

Section: Resultsmentioning

confidence: 87%

Epitaxial Heterogeneous Interfaces on N‐NiMoO₄/NiS₂ Nanowires/Nanosheets to Boost Hydrogen and Oxygen Production for Overall Water Splitting

Feng

Zhang

et al. 2018

Adv Funct Materials

412

223

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Developing bifunctional efficient electrocatalysts for both the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is in high demand for the development of overall water-splitting devices. In particular, the electrocatalytic performance can be largely improved by designing positive nanoscale-heterojunction with well-tuned interfaces. Herein, a novel top-down strategy is reported to construct the oxide/ sulfide heterostructures (N-NiMoO 4 /NiS 2 nanowires/nanosheets) as a multisite HER/OER catalyst. Starting with the NiMoO 4 nanowires, nitridation in a controlled manner enables activation of Ni sites in NiMoO 4 and then yields oxide/sulfide heterojunction by directly vulcanizing the highly composition-segregated N-NiMoO 4 nanowires. The abundant epitaxial heterogeneous interfaces at atomic-level facilitate the electron transfer from N-NiMoO 4 to NiS 2 , which further cooperate synergistically toward both the hydrogen and oxygen generation in alkali solution. Furthermore, with N-NiMoO 4 /NiS 2 grown carbon fiber cloth as the engineering electrode, the assembled N-NiMoO 4 /NiS 2 -N-NiMoO 4 /NiS 2 system can deliver a current density of 10 mA cm −2 with the cell voltage of 1.60 V in the water-splitting reaction. This current density is 3.39 times higher than that of the Pt-Ir set (2.95 mA cm −2 ). The excellent catalytic performance offered of N-NiMoO 4 /NiS 2 nanowires/nanosheets presents a great example to demonstrate the significance of interface engineering in the field of electrocatalysis.

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Section: Resultsmentioning

confidence: 87%

Epitaxial Heterogeneous Interfaces on N‐NiMoO₄/NiS₂ Nanowires/Nanosheets to Boost Hydrogen and Oxygen Production for Overall Water Splitting

Feng

Zhang

et al. 2018

Adv Funct Materials

412

223

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“…Using noble metal free electro catalysts are being in process in these recent researches; producing an efficient electro catalysts in affordable cost, sufficient long‐time stability with low over potential is still very complicated for large scale applications . Hence, researchers are synthesizing transition metal based oxides, sulphides, phosphides, carbides, nitrides and borides etc for electrochemical water splitting applications . Among other metal oxides, nickel and cobalt are the best and inevitable transition metals available in abundance with very good catalyzing ability towards OER activity.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Water Oxidation of NiCo₂O₄ and CoNi₂S₄ Nanospheres Supported on Ni Foam Substrate

et al. 2019

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Electrochemical water splitting is an environment-friendly technique for producing clean energy. Low-cost, high performance and robust electro catalysts for electrochemical oxygen evolution reaction (OER) is highly essential for improving the overall efficiency of water splitting. In the present study, NiCo 2 O 4 and CoNi 2 S 4 nanospheres were successfully prepared by employing solvothermal method and optimized at 180°C. XRD result confirmed the formation of cubic structure of both NiCo 2 O 4 and CoNi 2 S 4 nanospheres. SEM images evidently revealed the perfect nanospherical surface morphology of NiCo 2 O 4 and distorted nanospherical morphology of CoNi 2 S 4 . The obtained characteristic Raman active modes of vibrations confirmed the product formation. Photoluminescence study proclaimed the emission behavior of the product. FTIR results confirmed the metal oxygen vibrations such as NiÀ O, CoÀ O and NiÀ S of NiCo 2 O 4 and CoNi 2 S 4 nanospheres. UV spectra and Tauc plot revealed the optical band gaps of Ni and Co based oxide and sulfide nanospheres. Electrochemical studies of optimized NiCo 2 O 4 and CoNi 2 S 4 revealed the respective specific capacitance of 767.067 F/g and 648.11 F/g at scan rate of 10 mVs À 1 in 1 M KOH electrolyte solution. Furthermore, the current density of 331 and 159 mAg À 1 was achieved for the best performed NiCo 2 O 4 and CoNi 2 S 4 electrodes with improved electrical conductivity. The stability over 12 h of highly performed NiCo 2 O 4 nanospheres has been reported. This work suggested a viable and optimized approach to synthesize Ni and Co based oxide and sulfide nanospheres for efficient electrochemical water oxidation.

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“…Furthermore, the XPS peak of S 2p, shown in Figure d, is deconvoluted into the two binding‐energy peaks at 161.7 and 162.9 eV, which correspond to the S 2p 3/2 and S 2p 1/2 orbitals of S 2− , respectively . The component at 163.9 eV is typical of the metal–S bonds, while the other peak at 168.6 eV belongs to the shakeup satellite …”

Section: Resultsmentioning

confidence: 99%

“…[27] Furthermore, the XPS peak of S 2p, shown in Figure 3d, is deconvoluted into the two binding-energy peaks at 161.7 and 162.9 eV, which correspond to the S 2p 3/2 and S 2p 1/2 orbitals of S 2− , respectively. [10,28] The component at 163.9 eV is typical of the metal-S bonds, while the other peak at 168.6 eV belongs to the shakeup satellite. [28] The electrochemical performances of the NiS-NC HS composites were investigated in the three-electrode system in the 3 m KOH aqueous solution (see the Experimental Section for details).…”

Section: Resultsmentioning

confidence: 99%

“…[10,28] The component at 163.9 eV is typical of the metal-S bonds, while the other peak at 168.6 eV belongs to the shakeup satellite. [28] The electrochemical performances of the NiS-NC HS composites were investigated in the three-electrode system in the 3 m KOH aqueous solution (see the Experimental Section for details). To ascertain the advantageousness of the etching step and the coating of the N-doped C on the NiS types, the two control samples of the Ni 3 S 2 -NC and the pristine Ni 3 S 2 were tested under identical conditions.…”

Section: Resultsmentioning

confidence: 99%

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Millerite Core–Nitrogen‐Doped Carbon Hollow Shell Structure for Electrochemical Energy Storage

Tiruneh

Kang

Choi

et al. 2018

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Nickel sulfides have drawn much attention with the benefits of a high redox activity, high electrical conductivity, low cost, and fabrication ease; however, these metal sulfides are susceptible to mechanical degradation regarding their cycling performance. Conversely, hollow carbon shells exhibit a substantial electrochemical steadiness in energy storage applications. Here, the design and development of a novel millerite core-nitrogen-doped carbon hollow shell (NiS-NC HS) structure for electrochemical energy storage is presented. The nitrogen-doped carbon hollow shell (NC HS) protects against the degradation and the millerite-core aggregation, giving rise to an excellent rate capability and stability during the electrochemical charging-discharging processes, in addition to improving the NiS-NC HS conductivity. The NiS-NC HS/18h supercapacitor electrode displays an outstanding specific capacitance of 1170.72 F g (at 0.5 A g ) and maintains 90.71% (at 6 A g ) of its initial capacitance after 4000 charge-discharge cycles, owing to the unique core-shell structure. An asymmetric-supercapacitor device using NiS-NC HS and activated-carbon electrodes exhibits a high power and energy density with a remarkable cycling stability, maintaining 89.2% of its initial capacitance after 5000 cycles.

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Reverse Microemulsion‐Assisted Synthesis of NiCo₂S₄ Nanoflakes Supported on Nickel Foam for Electrochemical Overall Water Splitting

Abstract: COMMUNICATION 1701396 (1 of 8)

Cited by 53 publications

References 51 publications

Epitaxial Heterogeneous Interfaces on N‐NiMoO₄/NiS₂ Nanowires/Nanosheets to Boost Hydrogen and Oxygen Production for Overall Water Splitting

Epitaxial Heterogeneous Interfaces on N‐NiMoO₄/NiS₂ Nanowires/Nanosheets to Boost Hydrogen and Oxygen Production for Overall Water Splitting

Electrochemical Water Oxidation of NiCo₂O₄ and CoNi₂S₄ Nanospheres Supported on Ni Foam Substrate

Millerite Core–Nitrogen‐Doped Carbon Hollow Shell Structure for Electrochemical Energy Storage

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Reverse Microemulsion‐Assisted Synthesis of NiCo2S4 Nanoflakes Supported on Nickel Foam for Electrochemical Overall Water Splitting

Abstract: COMMUNICATION 1701396 (1 of 8)

Cited by 53 publications

References 51 publications

Epitaxial Heterogeneous Interfaces on N‐NiMoO4/NiS2 Nanowires/Nanosheets to Boost Hydrogen and Oxygen Production for Overall Water Splitting

Epitaxial Heterogeneous Interfaces on N‐NiMoO4/NiS2 Nanowires/Nanosheets to Boost Hydrogen and Oxygen Production for Overall Water Splitting

Electrochemical Water Oxidation of NiCo2O4 and CoNi2S4 Nanospheres Supported on Ni Foam Substrate

Millerite Core–Nitrogen‐Doped Carbon Hollow Shell Structure for Electrochemical Energy Storage

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Product

Resources

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Reverse Microemulsion‐Assisted Synthesis of NiCo₂S₄ Nanoflakes Supported on Nickel Foam for Electrochemical Overall Water Splitting

Epitaxial Heterogeneous Interfaces on N‐NiMoO₄/NiS₂ Nanowires/Nanosheets to Boost Hydrogen and Oxygen Production for Overall Water Splitting

Epitaxial Heterogeneous Interfaces on N‐NiMoO₄/NiS₂ Nanowires/Nanosheets to Boost Hydrogen and Oxygen Production for Overall Water Splitting

Electrochemical Water Oxidation of NiCo₂O₄ and CoNi₂S₄ Nanospheres Supported on Ni Foam Substrate