Silicone Nanofilament Supported Nickel Oxide: A New Concept for Oxygen Evolution Catalysts in Water Electrolyzers

Meseck, Georg R.; Fabbri, Emiliana; Schmidt, Thomas J.; Seeger, Stefan

doi:10.1002/admi.201500216

Cited by 11 publications

(17 citation statements)

References 25 publications

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“…The Co-and Mn-Ni/SNFs materials show Tafel slopes of 39 ± 5 and 43 ± 4 mV dec −1 , respectively, which are comparable to the Tafel slope of 50 ± 2 mV dec −1 that was previously reported for NiO/SNFs 27 and indicates that the OER proceeds through a similar mechanism. In contrast, the Fe-NiO/SNFs sample shows a significantly lower Tafel slope of 18 ± 1 mV dec −1 over the same range of current densities.…”

Section: Resultssupporting

confidence: 87%

“…The presence of the anodic and cathodic Ni 2+ /Ni 3+ redox peaks are clearly observed in the case of the Co-and Mn-NiO/SNFs materials (Figures 3a and 3b). While the cathodic and anodic peak positions for NiO/SNFs were reported to be 1.34 and 1.48 V vs. RHE 27 (Figure 3d), the initial peak positions (i.e. 2 nd CV cycle) of the Co-NiO/SNFs (1.31/1.42 V) are shifted to slightly lower potentials (Figure 3a).…”

Section: Resultsmentioning

confidence: 95%

“…27 In order to evaluate the possible advantages of including alternative transition metals in the NiO/SNFs materials, we again evaluate the OER activity in alkaline media. Figure 3 presents the electrochemical behavior of the M-NiO/SNFs (M = Co, Mn, Fe) in 0.1 M KOH.…”

Section: Resultsmentioning

confidence: 99%

“…6 1 ± 0.015 Fe-NiO/SNFs 18 ± 1 1 . 5 4 ± 0.014 NiO/SNFs 27 50 ± 2 1 . 6 1 ± 0.012 NiO/SNFs was already shown to provide a significant improvement as compared to unsupported NiO, these results demonstrate the advantages of using M-NiO/SNF over unsupported or pure NiO materials.…”

Section: Electrodementioning

confidence: 97%

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Silicone Nanofilament-Supported Mixed Nickel-Metal Oxides for Alkaline Water Electrolysis

Abbott

Meier

Meseck

et al. 2017

J. Electrochem. Soc.

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Mixed transition metal nickel oxide materials (M-NiO; M = Co, Mn, Fe) supported on silicone nanofilaments (SNFs) were synthesized via precipitation reaction with urea. All materials were evaluated for their OER activity in 0.1 M KOH, of which the Fe-NiO/SNFs showed a notable improvement over NiO/SNFs and unsupported NiO. The results presented herein demonstrate the extension of our previously reported synthesis for NiO/SNFs to yield SNF-supported mixed transition metal-oxide materials. The versatility and scalability of the synthesis are particularly interesting for the facile preparation of three-dimensional, binderless electrodes for alkaline water electrolysis applications. The urgency for efficient large-scale energy storage and conversion systems continues to rise as the implementation of intermittent renewable energy sources, such as wind and solar energy harvesting plants, continues to become more prevalent. To meet this demand, the electrolytic splitting of water is expected to play a key role due to its ability to produce clean, carbon emission-free hydrogen fuel at high pressure.1-3 Typically, the choice of highly active and stable electrocatalysts for use in acid-based polymer electrolyte water electrolysis (PEWE) is restricted to the noble metal oxides (i.e. IrO 2 /RuO 2 ), the scarcity and high cost of which will largely impede widespread commercialization. In the past decade, however, alkaline water electrolysis has regained considerable attention as the development of alkaline anion exchange membranes with improved ionic conductivity and stability continues to show significant progress.4-7 Alkaline water electrolysis operates on the basis of the anodic oxygen evolution reaction (OER: 4OH − → 2H 2 O + O 2 + 4e − ) and concurrent cathodic hydrogen evolution reaction (HER:The high pH environment associated with alkaline water electrolysis greatly expands the repertoire of OER catalyst candidate materials due to the heightened stability and relatively high activity of transition metal oxides in basic media. To date, Ni-based oxides have perhaps been the most promising OER catalysts for alkaline water electrolysis in terms of cost, stability, and activity, especially those containing Fe. [8][9][10][11] Ni-based oxides have been widely explored as OER electrocatalysts for use in alkaline water electrolysis throughout the years and even commercial systems currently utilize Ni-coated steel electrodes. 9More recently, the mixed metal hydroxides containing both Ni and Fe represent some of the most widely investigated catalysts due to the low OER overpotentials encountered in alkaline electrolytes and also at near-neutral pH conditions. 8,[11][12][13][14][15][16][17] To date, however, most electrodes for alkaline electrolysis are prepared as thin films on a two dimensional (2D) substrate using methods such as electrodeposition, dip-coating, or spin-coating. As a result, many research efforts have been directed at developing three-dimensional (3D) electrode structures that offer much higher electrocatalytical...

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Section: Resultssupporting

confidence: 87%

Section: Resultsmentioning

confidence: 95%

Section: Resultsmentioning

confidence: 99%

Section: Electrodementioning

confidence: 97%

See 2 more Smart Citations

Silicone Nanofilament-Supported Mixed Nickel-Metal Oxides for Alkaline Water Electrolysis

Abbott

Meier

Meseck

et al. 2017

J. Electrochem. Soc.

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“…Really, in the present work not only do the 30 consecutive potential cycles lead to an increase in the Ni 2+ /Ni 3+ redox peaks, but they also result in the growth in the OER current, particularly for the NiO‐NiFe 2 O 4 /rGO nanohybrid. Hence, the increased OER currents of the NiO‐NiFe 2 O 4 /rGO nanohybrid above 1.436 V achieved upon potential cycling can be attributed to a synergistic effect, that is, an increase in the exposed surface active sites and the development of a catalytically active Ni(OH) 2 /NiOOH hydrous oxide layer …”

Section: Resultsmentioning

confidence: 99%

NiFe Layered‐Double‐Hydroxide‐Derived NiO‐NiFe₂O₄/Reduced Graphene Oxide Architectures for Enhanced Electrocatalysis of Alkaline Water Splitting

Zhang

Zhou

et al. 2016

ChemElectroChem

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Electrochemical water splitting is an environmentally friendly technology to store renewable but intermittent energy into hydrogen fuels. Nowadays, exploiting low‐costing, high‐performance, and robust catalysts for the electrochemical oxygen evolution reaction (OER) is essential to improve the overall efficiency of water splitting. Herein, the synthesis, structural characterization, and electrocatalytic OER performance of NiO‐NiFe2O4 nanoparticles anchored on reduced graphite oxide frameworks (NiO‐NiFe2O4/rGO) were investigated. Facile thermal annealing of the NiFe layered double hydroxide (NiFe‐LDH) precursor led to the formation of highly dispersible NiO‐NiFe2O4 nanoparticles (20–30 nm in size) across the rGO substrate with a NiO/NiFe2O4 molar ratio up to 4.42. In contrast to the nanostructured NiFe‐LDH/rGO catalyst, the NiO‐NiFe2O4/rGO nanohybrid exhibits a lower OER onset potential (Eonset=1.436 V vs. RHE), affords a smaller overpotential of 296 mV, and achieves a current density of 10 mA cm−2 with a Tafel slope of about 43 mV dec−1; these values are comparable to those of the benchmark IrO2 catalyst. The synergy between the abundant catalytically active sites through good dispersion of NiO‐NiFe2O4 across the rGO substrate and fluent electron transport arising from the rGO and NiFe2O4 components results in the outstanding electrocatalytic activity. The extremely high catalytic activity, facile synthesis, and low‐cost of the NiO‐NiFe2O4/rGO nanohybrid make it a very promising catalyst for the OER.

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Electrocatalytic Oxygen Evolution Reaction in Acidic Environments – Reaction Mechanisms and Catalysts

Reier

Nong

Teschner

et al. 2016

Advanced Energy Materials

988

828

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The low efficiency of the electrocatalytic oxidation of water to O2 (oxygen evolution reaction‐OER) is considered as one of the major roadblocks for the storage of electricity from renewable sources in form of molecular fuels like H2 or hydrocarbons. Especially in acidic environments, compatible with the powerful proton exchange membrane (PEM), an earth‐abundant OER catalyst that combines high activity and high stability is still unknown. Current PEM‐compatible OER catalysts still rely mostly on Ir and/or Ru as active components, which are both very scarce elements of the platinum group. Hence, the Ir and/or Ru amount in OER catalysts has to be strictly minimized. Unfortunately, the OER mechanism, which is the most powerful tool for OER catalyst optimization, still remains unclear. In this review, we first summarize the current state of our understanding of the OER mechanism on PEM‐compatible heterogeneous electrocatalysts, before we compare and contrast that to the OER mechanism on homogenous catalysts. Thereafter, an overview over monometallic OER catalysts is provided to obtain insights into structure‐function relations followed by a review of current material optimization concepts and support materials. Moreover, missing links required to complete the mechanistic picture as well as the most promising material optimization concepts are pointed out.

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Silicone Nanofilament Supported Nickel Oxide: A New Concept for Oxygen Evolution Catalysts in Water Electrolyzers

Cited by 11 publications

References 25 publications

Silicone Nanofilament-Supported Mixed Nickel-Metal Oxides for Alkaline Water Electrolysis

Silicone Nanofilament-Supported Mixed Nickel-Metal Oxides for Alkaline Water Electrolysis

NiFe Layered‐Double‐Hydroxide‐Derived NiO‐NiFe₂O₄/Reduced Graphene Oxide Architectures for Enhanced Electrocatalysis of Alkaline Water Splitting

Electrocatalytic Oxygen Evolution Reaction in Acidic Environments – Reaction Mechanisms and Catalysts

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Silicone Nanofilament Supported Nickel Oxide: A New Concept for Oxygen Evolution Catalysts in Water Electrolyzers

Cited by 11 publications

References 25 publications

Silicone Nanofilament-Supported Mixed Nickel-Metal Oxides for Alkaline Water Electrolysis

Silicone Nanofilament-Supported Mixed Nickel-Metal Oxides for Alkaline Water Electrolysis

NiFe Layered‐Double‐Hydroxide‐Derived NiO‐NiFe2O4/Reduced Graphene Oxide Architectures for Enhanced Electrocatalysis of Alkaline Water Splitting

Electrocatalytic Oxygen Evolution Reaction in Acidic Environments – Reaction Mechanisms and Catalysts

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Product

Resources

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NiFe Layered‐Double‐Hydroxide‐Derived NiO‐NiFe₂O₄/Reduced Graphene Oxide Architectures for Enhanced Electrocatalysis of Alkaline Water Splitting