Vertically oriented cobalt selenide/NiFe layered-double-hydroxide nanosheets supported on exfoliated graphene foil: an efficient 3D electrode for overall water splitting

Hou, Yang; Lohe, Martin R.; Zhang, Jian; Liu, Shaohua; Zhuang, Xiaodong; Feng, Xinliang

doi:10.1039/c5ee03440j

Cited by 774 publications

(458 citation statements)

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“…Upon increasing the current density, the potential of the conditioned CoP NWs rises but gets stabilized quickly, indicating their outstanding mass transfer properties and mechanical robustness. 41,42 At each current density, the overpotential of the conditioned CoP NWs is significantly lower than that of the bare CF. The conditioned CoP NW electrode only needs a potential of 1.60 V (non iR -corrected) to deliver a high current density of 400 mA cm –2 .…”

Section: Resultsmentioning

confidence: 98%

“…The outstanding rate capability of the monolithic NW electrode is superior to that of graphene/Co 0.85 Se/NiFe-LDH composites and NiSe/Ni foam with a similar self-supported electrode structure. 41,42 Besides, the conditioned CoP NW electrode demonstrates excellent durability with a stable potential of 1.54 V (non iR -corrected) to deliver 50 mA cm –2 for 24 h without obvious degradation. After the continuous CP test, the conditioned CoP NW electrode still exhibits a CV curve pretty similar to the initial one, implying its remarkable stability.…”

Section: Resultsmentioning

confidence: 99%

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Vapor–solid synthesis of monolithic single-crystalline CoP nanowire electrodes for efficient and robust water electrolysis

et al. 2017

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Vapor–solid synthesis of monolithic single-crystalline CoP nanowire electrodes for efficient and robust water electrolysis

et al. 2017

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“…The charge transport process could be realized as the followings: an "electron hopping" along the layers occurs owing to an inner redox reaction of the M 2+ and M 3+ couple, and a migration of anions inside the interlayers to compensate the positive extra charge 221 . In particular, various LDHs such as binary MgAl, NiAl, ZnAl, CoAl, MgGa, NiGa, ZnGa, ZnCo, CoCo, CoFe, NiCo, NiFe and LiFe and ternary FeNiCo, NiFeMn [220][221][222][223][224][225][226][227][228][229][230][231][232][233] have been devoted to promote water oxidization. In particular, various LDHs such as binary MgAl, NiAl, ZnAl, CoAl, MgGa, NiGa, ZnGa, ZnCo, CoCo, CoFe, NiCo, NiFe and LiFe and ternary FeNiCo, NiFeMn [220][221][222][223][224][225][226][227][228][229][230][231][232][233] have been devoted to promote water oxidization.…”

Section: Ldh-based Oer Catalystsmentioning

confidence: 99%

Nanostructured catalysts for electrochemical water splitting: current state and prospects

et al. 2016

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Hydrogen is an ideal candidate for the replacement of fossil fuels in the future due to its zero emission of the carbonaceous species during its utilization. Water electrolysis is a dependable link of primary renewable energy and stable hydrogen energy. In this work, the fundamentals of water electrolysis, current popular electrocatalysts developed for cathodic hydrogen evolution reaction (HER) and anodic oxygen evoltion reacion (OER) in liquid electrolyte water electrolysis are reviewed. The main HER catalysts include noble metals, non-noble metal and composites, noble metal-free alloy, metal carbides, chalcogenides, phosphides and metal-free materials while the OER catalysts are focused on efficient Co-based, Ni-based materials and layered double hydroxides (LDH) materials. The strategies to improve catalytic activity, long-term durability and endurance to electrochemical erosions are introduced. The main challenges and future prospects for the further development of electrodes for water electrolysis are discussed. It is expected to give a guidance to the development of novel nanostructured electrocatalysts with low-cost for the electrochemical water splitting.

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“…Among these first row transition metal-based OER electrocatalysts, nickel containing materials have attracted great attentions due to its highly abundant nature and excellent OER activity. [10,28,[30][31][32][33][34][35][36][37]42] However, transition metals oxides or LDHs are generally suffered from their intrinsically low conductivity, as well as the particle aggregation. To overcome these problems, conductive substrates such as carbon nanomaterials have been introduced for loading or…”

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confidence: 99%

Promoting the Water Oxidation Catalysis by Synergistic Interactions between Ni(OH)₂ and Carbon Nanotubes

Wang

Chen

Daniel

et al. 2016

Advanced Energy Materials

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capsulating the electrocatalysts. [27,[43][44][45][46] Recently, Zhao and coworkers [47] and Dai and co-workers [48,49] anchored Co, Ni-Fe based water splitting catalysts on multiwall carbon nanotubes (MWCNTs), these approaches not only enhanced the charge transportations but also increased the available catalytic sites. Although the obtained materials exhibit excellent activity toward water oxidation, the improvement are not significant compared to the original catalysts. Very recently, Zhao and co-workers [50] reported a metal free catalyst based on oxidized MWCNTs (O-MWCNTs) which shows comparable activities to the transition metal-based catalysts, due to the generated oxygen containing ketone groups on surface. This work inspired us to revisit the inorganic/nanocarbon hybrid materials in pursuit of more advanced OER electrocatalysts.As desired, a surprisingly high active OER catalyst has been obtained by simply anchoring the crystalline β−Ni(OH) 2 onto the O-MWCNTs. Different from previous studies, this is the first time that a hybrid material with low Ni contents exhibits extremely high activities for catalyzing oxygen evolution. [41,46] This work paves the path for designing new earth abundant material based alternatives to replace the benchmarking precious Ir/Ru OER catalysts.In order to densely embed the Nickel hydroxide on the MWCNT S , a two-step synthetic strategy was employed to synthesize the hybrid materials as shown in Figure 1. First, the as purchased MWCNTs were purified and mildly oxidized by a piranha solution followed by hydrothermal treatment according to the literature method. [50] Afterward, the freshly obtained O-MWCNTs were mixed with the hydrolysed Ni 2+ solution to afford the hybrid materials. NH 4 OH was introduced as the precipitating reactant instead of strong alkali solution to obtain a particularly pure nickel hydroxide. [51] To gain insights into how the Ni contents in the hybrid materials affect the efficiency toward catalytic water oxidation, five samples with various Ni contents were prepared following the same synthetic route (see the Supporting Information).To gain insight into the structure, morphologies, and composition of the synthesized materials, powder X-ray diffraction (PXRD), scanning electron microscopy, transmission electron microscopy (TEM), hard X-ray photoelectron spectroscopy measurements (HAXPES) and, thermogravimetry (TG) techniques were used to characterize these materials. The morphology of the O-MWCNTs was determined by TEM, as shown in Figure S2a in the Supporting Information. After the loading of Ni, PXRD, and HAXPES (Figure 2a and Figure 3) show that the obtained catalysts are composed of pure crystalline β-Ni(OH) 2 and O-MWCNTs, moreover, no metal impurities such as Fe and Co were detected ( Figure S1, SupportingThe rapid growth in energy demand, the continuous consumption of fossil fuels and the arising environmental concerns are stimulating significant research interests in developing alternative energy systems. [1] Production of hydrogen from electro...

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Vertically oriented cobalt selenide/NiFe layered-double-hydroxide nanosheets supported on exfoliated graphene foil: an efficient 3D electrode for overall water splitting

Abstract: A 3D ternary hybrid containing Co0.85Se nanosheet-array and NiFe-LDH grown on electrochemically exfoliated graphene was synthesized for highly-efficient overall water-splitting.’

Cited by 774 publications

References 58 publications

Vapor–solid synthesis of monolithic single-crystalline CoP nanowire electrodes for efficient and robust water electrolysis

Vapor–solid synthesis of monolithic single-crystalline CoP nanowire electrodes for efficient and robust water electrolysis

Nanostructured catalysts for electrochemical water splitting: current state and prospects

Promoting the Water Oxidation Catalysis by Synergistic Interactions between Ni(OH)₂ and Carbon Nanotubes

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Vertically oriented cobalt selenide/NiFe layered-double-hydroxide nanosheets supported on exfoliated graphene foil: an efficient 3D electrode for overall water splitting

Abstract: A 3D ternary hybrid containing Co0.85Se nanosheet-array and NiFe-LDH grown on electrochemically exfoliated graphene was synthesized for highly-efficient overall water-splitting.’

Cited by 774 publications

References 58 publications

Vapor–solid synthesis of monolithic single-crystalline CoP nanowire electrodes for efficient and robust water electrolysis

Vapor–solid synthesis of monolithic single-crystalline CoP nanowire electrodes for efficient and robust water electrolysis

Nanostructured catalysts for electrochemical water splitting: current state and prospects

Promoting the Water Oxidation Catalysis by Synergistic Interactions between Ni(OH)2 and Carbon Nanotubes

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Product

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Promoting the Water Oxidation Catalysis by Synergistic Interactions between Ni(OH)₂ and Carbon Nanotubes