A survey of diverse earth abundant oxygen evolution electrocatalysts showing enhanced activity from Ni–Fe oxides containing a third metal

Gerken, James B.; Shaner, Sarah; Massé, Robert C.; Porubsky, Nicholas J.; Stahl, Shannon S.

doi:10.1039/c4ee00436a

Cited by 231 publications

(197 citation statements)

References 68 publications

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Section: Ionic Conductivity-inmentioning

confidence: 99%

“…[64][65][66] The combination of these non-noble metals in the form of alloys can be used to tune the activity of electrocatalysts. 20,64,67 Abundant metals can be used in large amounts at moderate costs in order to realize high surface area electrodes with thick active layers such as Raney-nickel alloys. 37,68,69 A chief improvement for the electrodes of the alkaline electrolysis cell might be realizable by microporous frameworks (such as foams 70,71 or finely woven meshes 72 ) so that the overall geometric cell area can be utilized.…”

Section: Ionic Conductivity-inmentioning

confidence: 99%

See 1 more Smart Citation

Acidic or Alkaline? Towards a New Perspective on the Efficiency of Water Electrolysis

Schalenbach

Tjarks

Carmo

et al. 2016

J. Electrochem. Soc.

275

182

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Water electrolysis is a promising technology for enabling the storage of surplus electricity produced by intermittent renewable power sources in the form of hydrogen. At the core of this technology is the electrolyte, and whether this is acidic or alkaline affects the reaction mechanisms, gas purities and is of significant importance for the stability and activity of the electrocatalysts. This article presents a simple but precise physical model to describe the voltage-current characteristic, heat balance, gas crossover and cell efficiency of water electrolyzers. State-of-the-art water electrolysis cells with acidic and alkaline electrolyte are experimentally characterized in order to parameterize the model. A rigorous comparison shows that alkaline water electrolyzers with Ni-based catalysts but thinner separators than those typically used is expected be more efficient than acidic water electrolysis with Ir and Pt based catalysts. This performance difference was attributed mainly to a similar conductivity but approximately 38-fold higher diffusivities of hydrogen and oxygen in the acidic polymer electrolyte membrane (Nafion) than those in the alkaline separator (Zirfon filled with a 30 wt% KOH solution In the endeavor to realize an environmentally-benign power supply infrastructure, water electrolysis for the production of hydrogen may prove a key technology for enabling energy conversion on a large scale.1,2 By applying a voltage to two electrodes immersed in an aqueous electrolyte, water can be electrochemically decomposed, evolving hydrogen at the negative pole, the cathode, and oxygen at the positive pole, the anode. During this process, protons or hydroxide ions must pass through the electrolyte to enable the electrochemical reactions at the electrodes. In order to achieve low extents of charge transport losses in electrolyzers, electrolytes with high conductivities are typically used. Such highly conductive electrolytes provide large quantities of ionic charge carriers (protons or hydroxide ions) and are thus either strong bases or acids. The reaction equations in acidic and alkaline aqueous regimes are displayed in Table I.Besides liquid aqueous electrolytes in combination with porous separators, polymer electrolyte membranes (PEMs) are typically used as electrolytes for water electrolysis and to separate the hydrogen and oxygen produced during operation.3 In PEMs, ionizable functional groups are embedded within a polymer matrix providing either mobile protons or hydroxide ions. 4 In an aqueous phase that is separated from the solid polymeric phase 5,6 the protons or hydroxide ions are dissolved but attracted to the oppositely charged ions of the functional group which are covalently bonded to the polymer matrix. As a result, the dissolved ions are captured inside the aqueous phase of the PEM. Hence, an advantage of solid PEMs is that pure water can supplied to the cell, which means that only the components that are in direct contact with the PEM are exposed to its corrosive alkaline or acidic aqueous ph...

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Section: Ionic Conductivity-inmentioning

confidence: 99%

Section: Ionic Conductivity-inmentioning

confidence: 99%

Acidic or Alkaline? Towards a New Perspective on the Efficiency of Water Electrolysis

Schalenbach

Tjarks

Carmo

et al. 2016

J. Electrochem. Soc.

275

182

View full text Add to dashboard Cite

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“…A noteworthy result from the Ni/Fe/Al triad data, Al III ions significantly promote the catalytic activity of mixed metal oxide containing Ni and Fe. The Ni/Fe-based oxides with Al III -containing composition showed much higher activity than the monometallic Ni and Fe oxides, as well as Ni/Fe binary oxides (Gerken et al, 2012;Gerken et al, 2014;Zhang et al, 2015). In this study, the synthesis of spinel NiFeAlO 4 as oxygen carrier by simple solid state reaction and reaction mechanism of NiFeAlO 4 are primarily discussed.…”

Section: Introductionmentioning

confidence: 99%

Use of Spinel Nickel Aluminium Ferrite as Self-Supported Oxygen Carrier for Chemical Looping Hydrogen Generation Process

Kuo

Huang

Hsu

et al. 2015

Aerosol Air Qual. Res.

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Chemical looping hydrogen generation (CLHG), as a new technology involved in chemical looping combustion (CLC) process and steam-iron process, has attracted attention for clean energy generation and efficient energy conversion. A systematic investigation of spinel NiFeAlO 4 has led to characterization of a well-defined self-supported oxygen carrier which was prepared by solid state reaction. The redox behavior of NiFeAlO 4 shows the enhancement on the resistance to agglomeration exceeding previously reported CLC process using similar compositions including Fe 2 O 3 , NiO and NiFe 2 O 4 without any inert support. Moreover, the high CO 2 conversion and H 2 generation by NiFeAlO 4 oxygen carrier under a fixed-bed reactor (FxBR) were obtained. The reaction mechanism of NiFeAlO 4 subjected to the isothermal stepwise reduction in a sequence of varying durations by XRD was also demonstrated, which provided with a novel function of selfsupported and agglomeration-resistant characteristic in the oxygen carrier system.

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“…[4][5][6][7][8][9][10][11][12] Mixed metal oxides in the (Ni-Fe)O x and (Ni-Co)O x composition spaces are among the most active and most studied OER catalysts, 2,[13][14][15][16][17][18][19][20] and combinatorial methods have been deployed to search pseudo-ternary spaces for improved OER catalysts. [7][8][9]11 We have established high throughput methods to systematically investigate the performance of pseudo-quaternary material libraries as OER electrocatalysts and have reported a new, highly active catalyst composition region in the (Ni-Fe-Co-Ce)O x composition space. 21 Our continued investigation of this material system has revealed systematic trends in electrochemical signals 22 ; while our expansion of this composition space has led to the discovery of a new, highly active catalyst composition region in the (Ni-La-Co-Ce)O x composition space.…”

Section: Introductionmentioning

confidence: 99%

“…For OER in base, the range of viable catalyst compositions is quite extensive and encompasses metal oxides containing 3 or 4 cations including mixtures of transition metals and rare earths. [8][9][10][21][22][23] Due to the wide range of optical properties of the elemental oxides, the optical transmission of the mixed-metal oxide compositions must be mapped under operating potentials to ascertain the optimal materials for solar fuel applications.…”

Section: Introductionmentioning

confidence: 99%

Identification of optimal solar fuel electrocatalysts via high throughput in situ optical measurements

et al. 2014

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Many solar fuel generator designs involve illumination of a photoabsorber stack coated with a catalyst for the oxygen evolution reaction (OER). In this design, impinging light must pass through the catalyst layer before reaching the photoabsorber(s), and thus optical transmission is an important function of the OER catalyst layer. Many oxide catalysts, such as those containing elements Ni and Co, form oxide or oxyhydroxide phases in alkaline solution at operational potentials that differ from the phases observed in ambient conditions. To characterize the transparency of such catalysts during OER operation, 1031 unique compositions containing the elements Ni, Co, Ce, La, and Fe were prepared by a high throughput inkjet printing technique. The catalytic current of each composition was recorded at an OER overpotential of 0.33 V with simultaneous measurement of the spectral transmission. By combining the optical and catalytic properties, the combined catalyst efficiency was calculated to identify the optimal catalysts for solar fuel applications within the material library. The measurements required development of a new high throughput instrument with integrated electrochemistry and spectroscopy measurements, which enables various spectroelectrochemistry experiments.

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A survey of diverse earth abundant oxygen evolution electrocatalysts showing enhanced activity from Ni–Fe oxides containing a third metal

Abstract: Mixed metal oxides containing Ni, Fe, and a third metal constitute a broad family of highly active water oxidation electrocatalysts.

Cited by 231 publications

References 68 publications

Acidic or Alkaline? Towards a New Perspective on the Efficiency of Water Electrolysis

Acidic or Alkaline? Towards a New Perspective on the Efficiency of Water Electrolysis

Use of Spinel Nickel Aluminium Ferrite as Self-Supported Oxygen Carrier for Chemical Looping Hydrogen Generation Process

Identification of optimal solar fuel electrocatalysts via high throughput in situ optical measurements

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