Electrochemical investigations on amorphous Fe-base alloys for alkaline water electrolysis

Müller, Christian I.; Rauscher, T.; Schmidt, Andreas; Schubert, Thomas; Weißgärber, Thomas; Kieback, Bernd; Röntzsch, Lars

doi:10.1016/j.ijhydene.2014.03.151

Cited by 55 publications

(12 citation statements)

References 53 publications

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“…These excellent electrochemical property was explained by the hypohyper-d-electronic interactive effect in Brewer-type intermetallic systems 55 , indicating that Mo element of the left half transition series has empty or half-filled d-electrons while Ni element in the right half of the transition series has internally paired d-electrons. Recently, Rȍntzsch et al 59 reported an efficient technique to improve HER activity of Fe-based alloys by doping of B and Si after CV-pretreatment procedure. Recently, Gary et al 56 reported a method to synthesize unsupported Ni−Mo nanopowders, which can be suspended in common solvents and cast onto any substrates.…”

Section: Noble Metal-free Alloymentioning

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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Section: Noble Metal-free Alloymentioning

confidence: 99%

Nanostructured catalysts for electrochemical water splitting: current state and prospects

et al. 2016

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“…[1][2][3] Ascertaining structure-property relationships remains a central challenge in the field of heterogeneous catalysis and comprises an important strategy for the development of superior electrocatalysts. [4][5][6] Enhanced catalytic activity has been 2 ascribed to amorphous materials as heterogeneous catalysts and OER electrocatalysts, [7][8][9][10][11][12][13][14][15][16][17][18] while high activity and stability has also been reported for nanostructured, multi-phase heterogeneous catalysts and electrocatalysts, with the behavior attributed to cooperative effects like spill-over or unique interfacial crystallographic structures. [19][20][21] Among the most active and investigated OER electrocatalysts in basic electrolytes are transition metal oxy hydroxides.…”

Section: Introductionmentioning

confidence: 99%

An Operando Investigation of (Ni–Fe–Co–Ce)O_x System as Highly Efficient Electrocatalyst for Oxygen Evolution Reaction

et al. 2017

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Abstract. The oxygen evolution reaction (OER) is a critical component of industrial processes such as electrowinning of metals and the chlor-alkali process. It also plays a central role in the developing renewable energy field of solar-fuels generation by providing both the protons and electrons needed to generate fuels such as H 2 or reduced hydrocarbons from CO 2 . To improve these processes, it is necessary to expand the fundamental understanding of catalytically active species at low overpotential, which will further the development of electrocatalysts with high activity and durability. In this context, performing experimental investigations of the electrocatalysts under realistic working regimes, i.e. under operando conditions, is of crucial importance. Here, we study a highly active quinary transition metal oxide-based OER electrocatalyst by means of operando ambient pressure X-ray photoelectron spectroscopy and X-ray absorption spectroscopy performed at the solid/liquid interface. We observe that the catalyst undergoes a clear chemical-structural evolution as a function of the applied potential with Ni, Fe and Co oxyhydroxides comprising the active catalytic species. While CeO 2 is redox inactive under catalytic conditions, its influence on the redox processes of the transition metals boosts the catalytic activity at low overpotentials, introducing an important design principle for the optimization of electrocatalysts and tailoring of high performance materials.

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“…5,6 One of the key challenges when developing a highly efficient, application-oriented ASMWE system is to find a stable, low cost catalyst for the HER. Mostly, transition metal based electrodes [7][8][9] serve as a HER catalyst in alkaline medium, but their activity is far below that of Pt. Carbon-containing compounds like graphene oxide 10 and graphene 11 have been characterised as highly active catalysts for the oxygen evolution reaction (OER) in alkaline solution.…”

Section: Introductionmentioning

confidence: 99%

The effect of surface modification by reduced graphene oxide on the electrocatalytic activity of nickel towards the hydrogen evolution reaction

Chanda

Hnát

Dobrota

et al. 2015

Phys. Chem. Chem. Phys.

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To find cheap, efficient and durable hydrogen evolution reaction catalysts is one of the major challenges when developing an alkaline water electrolysis system. In this paper we describe an electrochemically reduced graphene oxide (RGO)-modified Ni electrode, which could be used as a pre-eminent candidate for such a system. The experimentally determined characteristics of this electrode showing superior electrocatalytic activity were complemented by density functional theory calculations. Thermodynamic considerations led to the conclusion that H atoms, formed upon H2O discharge on Ni, spill onto the RGO, which serves as an H adatom acceptor, enabling continuous cleaning of Ni-active sites and an alternative pathway for H2 production. This mode of action is rendered by the unique reactivity of RGO, which arises due to the presence of O surface groups within the graphene structure. The significant electrocatalytic activity and life time (>35 days) of the RGO towards the HER under conditions of alkaline water electrolysis are demonstrated.

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Electrochemical investigations on amorphous Fe-base alloys for alkaline water electrolysis

Cited by 55 publications

References 53 publications

Nanostructured catalysts for electrochemical water splitting: current state and prospects

Nanostructured catalysts for electrochemical water splitting: current state and prospects

An Operando Investigation of (Ni–Fe–Co–Ce)O_x System as Highly Efficient Electrocatalyst for Oxygen Evolution Reaction

The effect of surface modification by reduced graphene oxide on the electrocatalytic activity of nickel towards the hydrogen evolution reaction

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Electrochemical investigations on amorphous Fe-base alloys for alkaline water electrolysis

Cited by 55 publications

References 53 publications

Nanostructured catalysts for electrochemical water splitting: current state and prospects

Nanostructured catalysts for electrochemical water splitting: current state and prospects

An Operando Investigation of (Ni–Fe–Co–Ce)Ox System as Highly Efficient Electrocatalyst for Oxygen Evolution Reaction

The effect of surface modification by reduced graphene oxide on the electrocatalytic activity of nickel towards the hydrogen evolution reaction

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An Operando Investigation of (Ni–Fe–Co–Ce)O_x System as Highly Efficient Electrocatalyst for Oxygen Evolution Reaction