In situ hydrothermal growth of metallic Co9S8-Ni3S2 nanoarrays on nickel foam as bifunctional electrocatalysts for hydrogen and oxygen evolution reactions

Zhou, Yun; Xi, Shengqi; Yang, Xigang; Wu, Hongjing

doi:10.1016/j.jssc.2018.12.004

Cited by 50 publications

(18 citation statements)

References 54 publications

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“…The resulting electrode performed well in overall water splitting with an encouraging overpotential

η_{10}

=85 mV for the HER in 1 M KOH . Conceptually related electrodes featuring Co 9 S 8 −Ni 3 S 2 nanoarrays on Ni foam were prepared and the observed overpotential of

η_{10}

=120 mV confirms the interesting prospects of these composite catalysts …”

Section: Metal‐rich Transition‐metal Chalcogenides For Hermentioning

confidence: 64%

Metal‐Rich Chalcogenides for Electrocatalytic Hydrogen Evolution: Activity of Electrodes and Bulk Materials

et al. 2020

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rich chalcogenides composed of highly abundant elements recently emerged as promising catalysts for the electrocatalytic hydrogen evolution reaction (HER). Many of these materials benefit from a high intrinsic conductivity as compared to their chalcogen-rich congeners, greatly reducing the necessity for conductive additives or sophisticated nanostructuring. Herein, we showcase the high potential of metal-rich transitionmetal chalcogenides for the electrocatalytic hydrogen formation by summarizing the recent progress achieved with M 9 S 8 (pentlandite type) and M 3 S 2 (heazlewoodite type) based materials, which represent the most frequently applied compositions for this purpose. By a detailed electrochemical comparison of bulk as well as pellet electrodes of metal-rich Fe 4.5 Ni 4.5 S 8 , we also aim at raising awareness in the community for the inherent differences in catalytic properties of the materials themselves and those of the fabricated electrodes, a point that is often disregarded in reports on HER-catalyst systems.[a] Dr.

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“…The resulting electrode performed well in overall water splitting with an encouraging overpotential

η_{10}

=85 mV for the HER in 1 M KOH . Conceptually related electrodes featuring Co 9 S 8 −Ni 3 S 2 nanoarrays on Ni foam were prepared and the observed overpotential of

η_{10}

=120 mV confirms the interesting prospects of these composite catalysts …”

Section: Metal‐rich Transition‐metal Chalcogenides For Hermentioning

confidence: 64%

Metal‐Rich Chalcogenides for Electrocatalytic Hydrogen Evolution: Activity of Electrodes and Bulk Materials

et al. 2020

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“…[24,29] The fitting peaks of S 2p at binding energies of 161.1, 162.2 and 163.4 eV in Figure 4b are coincided with S 2p 3/2 , S 2p 1/2 and NiÀ S bonding of the divalent sulfide ions. [42] The additional peak at 168.5 eV is typical for NiÀ OÀ S species with a high oxidation state of sulfur due to the surface oxidation in air. [24,27,43] The peak at binding energy of 705.2 eV in the Fe 2p spectrum can be assigned to the Ni auger peak, [44,45] and the peaks at 711.3 and 724.4 eV are accorded with Fe 3 + (Figure 4c).…”

Section: Resultsmentioning

confidence: 99%

Fe‐Doped Ni₃S₂ Nanowires with Surface‐Restricted Oxidation Toward High‐Current‐Density Overall Water Splitting

Wang

Zhang

et al. 2019

ChemElectroChem

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It is critical to develop a highly effective and economical electrocatalyst to lower the energy losses for the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER). In this work, Fe‐doped Ni3S2 nanowires with diameters of ca. 17 nm and lengths of 1.4∼2 μm are synthesized on Ni foam through a one‐step solvothermal route for alkaline water splitting, which display notable active and excellent durability for both OER and HER under high current densities. The optimal Fe13.7%‐Ni3S2 nanowires electrode can attain 200 mA cm−2 at a fairly low overpotential of 223 mV, and 500 mA cm−2 at 245 mV toward OER. Furthermore, it yields a considerable low overpotential of 109 mV to garner 10 mA cm−2, and 246 mV for 500 mA cm−2 toward HER. The incorporation of iron simultaneously modifies the electronic structure and morphology of Ni3S2, which not only enhances the conductivity but also generates abundant active edge sites. The slight surface‐restricted oxidation of nanowires in a strongly basic electrolyte in situ generates a large number of interfaces, which enables the reactivity and durability for both OER and HER. Accordingly, an alkaline water electrolyzer with two Fe13.7%‐Ni3S2 electrodes only requires a low cell voltage of 1.53 V to achieve 10 mA cm−2, and 1.95 V to 500 mA cm−2 with striking stability. The as‐prepared Fe‐doped Ni3S2 nanowires can be potentially utilized for actual water electrolysis under high current densities.

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“…14-0020). The peaks at 854.9 eV and 872.7 eV are assigned to Ni 2 + , [12] and the binding energy at 855.9 eV corresponds to Ni 3 + . Note that the atomic percentage of N dopant reached 10.37 %.…”

Section: Resultsmentioning

confidence: 99%

“…[11] In the Ni 2p region (Figure 2c), it was fitted with two spin-orbit doublets and two shakeup satellites. The peaks at 854.9 eV and 872.7 eV are assigned to Ni 2 + , [12] and the binding energy at 855.9 eV corresponds to Ni 3 + . [13] The deconvoluted two peaks at 284.7 eV and 285.8 eV in C 1s spectra ( Figure S3a) represent CÀ C and CÀ N bands, respectively, in which CÀ N bonding further indicates the successful doping of N. [14] In deconvoluted O 1s spectra ( Figure S3b), the peak at 531.9 eV is ascribed to O vacancy, favorable for catalytic ORR.…”

Section: Resultsmentioning

confidence: 99%

In‐situ One‐Step Preparation of Nickel‐Tipped N‐doped Carbon Nanotubes for Oxygen Reduction

Huai

et al. 2019

ChemCatChem

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Here, we successfully synthesized N-doped carbon nanotubes embedded with nickel-based nanoparticles on the top (N-CNTs/ E-NNPs) by directly procedural calcination of melamine and nickel foam at 520°C, 540°C and 700°C in Ar. When applied for oxygen reduction reaction (ORR), the onset potential and halfwave potential are 0.96 V and 0.86 V in 0.1 M KOH, comparable to that of the commercial 10 wt% Pt/C. Moreover, the hybrids possess higher stability and better methanol tolerance. Additionally, the Tafel slope of N-CNTs/E-NNPs is 76 mV dec À 1 in 0.1 M KOH, lower than 83 mV dec À 1 of the commercial 10 wt% Pt/C, demonstrating a good kinetic process. The remarkable features are mainly ascribed to synergistic enhancement effect from N-rich doped carbon nanotubes (N-CNTs) and embedded Ni-based nanoparticles on the top, promoting mass and electrons transport, enhancing the activity of active sites and making it a promising highly efficient non-precious metal ORR catalyst.

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In situ hydrothermal growth of metallic Co9S8-Ni3S2 nanoarrays on nickel foam as bifunctional electrocatalysts for hydrogen and oxygen evolution reactions

Cited by 50 publications

References 54 publications

Metal‐Rich Chalcogenides for Electrocatalytic Hydrogen Evolution: Activity of Electrodes and Bulk Materials

Metal‐Rich Chalcogenides for Electrocatalytic Hydrogen Evolution: Activity of Electrodes and Bulk Materials

Fe‐Doped Ni₃S₂ Nanowires with Surface‐Restricted Oxidation Toward High‐Current‐Density Overall Water Splitting

In‐situ One‐Step Preparation of Nickel‐Tipped N‐doped Carbon Nanotubes for Oxygen Reduction

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In situ hydrothermal growth of metallic Co9S8-Ni3S2 nanoarrays on nickel foam as bifunctional electrocatalysts for hydrogen and oxygen evolution reactions

Cited by 50 publications

References 54 publications

Metal‐Rich Chalcogenides for Electrocatalytic Hydrogen Evolution: Activity of Electrodes and Bulk Materials

Metal‐Rich Chalcogenides for Electrocatalytic Hydrogen Evolution: Activity of Electrodes and Bulk Materials

Fe‐Doped Ni3S2 Nanowires with Surface‐Restricted Oxidation Toward High‐Current‐Density Overall Water Splitting

In‐situ One‐Step Preparation of Nickel‐Tipped N‐doped Carbon Nanotubes for Oxygen Reduction

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Fe‐Doped Ni₃S₂ Nanowires with Surface‐Restricted Oxidation Toward High‐Current‐Density Overall Water Splitting