Investigation of NiFe-Based Catalysts for Oxygen Evolution in Anion-Exchange Membrane Electrolysis

Zignani, Sabrina Campagna; Faro, Massimiliano Lo; Trocino, Stefano; Aricò, A.S.

doi:10.3390/en13071720

Cited by 21 publications

(16 citation statements)

References 56 publications

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“…The cell components and conditions, such as the type of AEM, electrolyte concentration, or cell temperature, vary in most literature studies. Here, we have listed the specific cell components, cell conditions, cell voltage, energy conversion efficiency (ECE) estimated at 1 A cm –2 , and stability test conditions reported in recent 2 years in Tables S2 and S3. ,,,,− The M-NiFe-LDH/NF showed high ECE of 71.5% at 50 °C and 72.6% at 80 °C at 1 A cm –2 . These values are the highest among AEMWEs using commercial AEM without carbonaceous materials at the anode.…”

Section: Resultsmentioning

confidence: 99%

Design Principles of NiFe-Layered Double Hydroxide Anode Catalysts for Anion Exchange Membrane Water Electrolyzers

Jeon

Lim

Kang

et al. 2021

ACS Appl. Mater. Interfaces

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Much effort has been devoted to developing electrocatalysts applicable to anion exchange membrane water electrolyzers (AEMWEs). Among many candidates for oxygen evolution reaction, NiFe-layered double hydroxide (LDH)-based electrocatalysts show the highest activity in an alkaline medium. Unfortunately, the poor electrical conductivity of NiFe-LDH limits its potential as an electrocatalyst, which was often solved by hybridization with conductive carbonaceous materials. However, we find that using carbonaceous materials for anodes has detrimental effects on the stability of AEMWEs at industrially relevant current densities. In this work, a facile monolayer structuring is suggested to overcome low electrical conductivity and improve mass transport without using carbonaceous materials. The monolayer NiFe-LDH deposited on Ni foam showed much better AEMWE performance than conventional bulk NiFe-LDH due to better electrical conductivity and higher hydrophilicity. A high energy conversion efficiency of 72.6% and outstanding stability at a current density of 1 A cm −2 over 50 h could be achieved without carbonaceous material. This work highlights electrical conductivity and hydrophilicity of catalysts in membrane-electrode-assembly as key factors for high-performance AEMWEs.

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Section: Resultsmentioning

confidence: 99%

Design Principles of NiFe-Layered Double Hydroxide Anode Catalysts for Anion Exchange Membrane Water Electrolyzers

Jeon

Lim

Kang

et al. 2021

ACS Appl. Mater. Interfaces

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“…Also, in the case of CuO deposition (spray coating) onto Sigracet 35BC ® , the typical peaks of CuO and graphite, for carbonaceous substrate, with an average crystallite size of 20 nm, are observed (Figure 4e,f S3. Both NiO and NiFe 2 O 4 are good electrocatalysts for oxygen evolution in alkaline environment [79]. The average crystallite size for Fe 2 O 3 was about 30 nm.…”

Section: Hydrophobic Carbonaceous Backing-based Cellmentioning

confidence: 99%

Dry Hydrogen Production in a Tandem Critical Raw Material-Free Water Photoelectrolysis Cell Using a Hydrophobic Gas-Diffusion Backing Layer

et al. 2020

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A photoelectrochemical tandem cell (PEC) based on a cathodic hydrophobic gas-diffusion backing layer was developed to produce dry hydrogen from solar driven water splitting. The cell consisted of low cost and non-critical raw materials (CRMs). A relatively high-energy gap (2.1 eV) hematite-based photoanode and a low energy gap (1.2 eV) cupric oxide photocathode were deposited on a fluorine-doped tin oxide glass (FTO) and a hydrophobic carbonaceous substrate, respectively. The cell was illuminated from the anode. The electrolyte separator consisted of a transparent hydrophilic anionic solid polymer membrane allowing higher wavelengths not absorbed by the photoanode to be transmitted to the photocathode. To enhance the oxygen evolution rate, a NiFeOX surface promoter was deposited on the anodic semiconductor surface. To investigate the role of the cathodic backing layer, waterproofing and electrical conductivity properties were studied. Two different porous carbonaceous gas diffusion layers were tested (Spectracarb® and Sigracet®). These were also subjected to additional hydrophobisation procedures. The Sigracet 35BC® showed appropriate ex-situ properties for various wettability grades and it was selected as a cathodic substrate for the PEC. The enthalpic and throughput efficiency characteristics were determined, and the results compared to a conventional FTO glass-based cathode substrate. A throughput efficiency of 2% was achieved for the cell based on the hydrophobic backing layer, under a voltage bias of about 0.6 V, compared to 1% for the conventional cell. For the best configuration, an endurance test was carried out under operative conditions. The cells were electrochemically characterised by linear polarisation tests and impedance spectroscopy measurements. X-Ray Diffraction (XRD) patterns and Scanning Electron Microscopy (SEM) micrographs were analysed to assess the structure and morphology of the investigated materials.

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“…NiFe 2 O 4 electrocatalyst was obtained by a liquid‐phase oxalate method [47] . This methodology was chosen because it allowed us to work in an aqueous environment, was flexible, did not require expensive equipment and could be carried out at low temperatures and pressures.…”

Section: Methodsmentioning

confidence: 99%

Anion Exchange Membrane Water Electrolysis Based on Nickel Ferrite Catalysts

et al. 2022

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A nickel ferrite was prepared by a liquid‐phase method and used as an oxygen evolution catalyst in an anion exchange membrane electrolyser. A complete physicochemical characterization of the catalyst was performed through X‐ray diffraction (XRD), Transmission electron microscopy (TEM) and X‐ray photoelectron spectroscopy (XPS). Then, the nickel ferrite was deposited by spray coating technique onto a Fumasep® FAA3‐50 anion‐exchange membrane to realize a catalyst‐coated membrane (CCM), and tested in a 5 cm2 single cell setup in the so‐called zero‐gap configuration. At 60 °C and 2.2 V, a current density of 3 A/cm2 was reached, which is higher than that obtained with NiO and IrO2 commercial catalysts. Moreover, a chronoamperometric test of 120 h highlighted the good stability of the synthesized catalyst.

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Investigation of NiFe-Based Catalysts for Oxygen Evolution in Anion-Exchange Membrane Electrolysis

Cited by 21 publications

References 56 publications

Design Principles of NiFe-Layered Double Hydroxide Anode Catalysts for Anion Exchange Membrane Water Electrolyzers

Design Principles of NiFe-Layered Double Hydroxide Anode Catalysts for Anion Exchange Membrane Water Electrolyzers

Dry Hydrogen Production in a Tandem Critical Raw Material-Free Water Photoelectrolysis Cell Using a Hydrophobic Gas-Diffusion Backing Layer

Anion Exchange Membrane Water Electrolysis Based on Nickel Ferrite Catalysts

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