Oxidation of Hydrogen on Ni/Yttria‐Stabilized Zirconia Cermet Anodes

Primdahl, S.; Mogensen, Mogens Bjerg

doi:10.1149/1.1838026

Cited by 282 publications

(254 citation statements)

References 7 publications

(10 reference statements)

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“…It can be found that the EAT increases from 8.1 μm to 9.4 μm under Vcell=0.8V as operating temperature T decreases from 1173K to 873K, which is consistent with results in [7]. On the contrary, [5,14,4,26] revealed that the EAT was negatively correlated with operating temperature T.…”

Section: Effect Of Operating Conditionssupporting

confidence: 86%

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Investigation of the electrochemical active thickness of solid oxide fuel cell anode

Zheng

2014

International Journal of Hydrogen Energy

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Section: Effect Of Operating Conditionssupporting

confidence: 86%

“…For the standard cell defined with parameters in Table. 3, the EAT is 8.1 μm (Vcell=0.8 V). Such a small value is in the range of [5,6,26,28,29], but differs a lot from [7,25,30]. The differences are probably caused by the quite different exchange current densities used in simulations.…”

Section: Resultsmentioning

confidence: 97%

Investigation of the electrochemical active thickness of solid oxide fuel cell anode

Zheng

2014

International Journal of Hydrogen Energy

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“…This result indicates that the identified electrodeposition conditions used for depositing Ni onto Ag/GDC scaffold improved the performance of the anode, though the value remains greater than data reported in the literature for Ni/GDC and Ni/YSZ anodes fabricated using conventional and infiltration techniques (0.1-0.35 cm −2 ), [48][49][50][51] showing that more optimization is needed to further improve performance, and in this regard many process variables remain to be explored.…”

Section: Effect Of Additives-the Effect Of Non-anionic (Surfynol) Anmentioning

confidence: 68%

Nickel Electrodeposition on Silver for the Development of Solid Oxide Fuel Cell Anodes and Catalytic Membranes

Jamil

Ruiz‐Trejo

Brandon

2017

J. Electrochem. Soc.

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Nickel was electrodeposited on porous Ag/GDC (silver/Ce 0.9 Gd 0.1 O 2-x ) scaffolds and dense Ag/GDC composites for the fabrication of SOFC electrodes and catalytic membranes respectively. To control the distribution and amount of nickel deposition on the Ag/GDC surfaces; first, a systematic cyclic voltammetry study of nickel electrodeposition from a Watts bath on silver foils was carried out to understand the influence of operating conditions on the electrodeposition process. From the cyclic voltammetry study, it can be concluded that suitable operating conditions for nickel electrodeposition into porous Ag/GDC scaffolds and catalytic membranes are: 1.1 M Ni 2+ concentration in Watts bath; deposition potential between −0.65 to −1.0 V vs. Ag/AgCl; a temperature at 55 • C; sodium dodecyl sulfate (SDS) as the surfactant; pH 4.0 ± 0.2 and an agitation rate of 500 rpm. It was observed that the nickel surface microstructure changed with the deposition current densities due to the co-evolution of H 2 . Pulse and continuous electrodeposition modes allow nickel to be deposited throughout porous Ag/GDC scaffolds and onto catalytic membranes. The pulse electrodeposition mode is favored as this is shown to result in an even Ni distribution within the porous scaffolds at minimum H 2 pitting. Nickel is used as a catalyst and current collector in electrochemical energy conversion systems such as solid oxide fuel cells (SOFCs), electrolysers, and as a catalyst in catalytic membranes ( Figure 1). Conventionally, Ni is incorporated into SOFC anodes by mechanically mixing NiO and ionic conductive materials such as yttriastabilized zirconia (YSZ) and Ce 0.9 Gd 0.1 O 2-x (GDC), then sintering at high temperature. However, the use of relatively large volumes of Ni (∼30 vol%) needed to achieve adequate electronic conductivity in the electrodes will affect the stability of cell microstructure under redox cycling. Recent advances in the manufacture of SOFC anodes via infiltration of Ni nitrate solution into a porous backbone (scaffold) have made it possible to achieve an excellent performance with a significantly reduced amount of nickel.1,2 However, repeated infiltration involving heating and cooling cycles is a lengthy and energy consuming process, presenting challenges to its industrial application. An alternative is to use electroless and electrodeposition techniques, which offer the potential to accelerate the incorporation of Ni into porous scaffolds at room or near-room temperature. The electroless deposition of Ni is well known and it is a simple process used to coat any substrate, however the use of boron-or phosphorus-based reducing agents in this technique is unsuitable for fuel cells due to adverse catalytic effects of the residues.3 Alternatively, hydrazine has been used as the reducing agent in the past years 4-6 yet its high toxicity may not be suitable for large production.Catalytic membranes have shown their potential to reform methane to syngas (CO+H 2 ) by coupling oxygen separation from air and catalytic partial me...

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“…The strong dependence of the R H on temperature is typically associated with charge transfer process. 30 R L for HOR is essentially independent of applied dc bias and shows much less dependence on temperature (Figs. 7 and 9).…”

Section: O [4]mentioning

confidence: 99%

Mechanism and Kinetics of Ni-Y₂O₃-ZrO₂Hydrogen Electrode for Water Electrolysis Reactions in Solid Oxide Electrolysis Cells

Pan

Chen

et al. 2015

J. Electrochem. Soc.

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Ni-Y 2 O 3 stabilized ZrO 2 (Ni-YSZ) cermet is the most commonly used hydrogen electrode for hydrogen oxidation reaction (HOR) under solid oxide fuel cell (SOFC) mode and water reduction reaction (WRR) under solid oxide electrolysis cell (SOEC) mode. Here we studied the electrocatalytic activity of Ni-YSZ electrodes as a function of Ni content, water concentration and dc bias for WRR and HOR under SOEC and SOFC modes, respectively. The activity of Ni-YSZ cermet increases significantly with the increase of YSZ content due to the enhanced three phase boundaries (TPB). The electrode activity for the WRR and in less degree for the HOR increases with the increase of steam concentration. The electrode polarization resistance, R E , for the WRR increases with the dc bias, while in the case of HOR, R E decreases with the dc bias, demonstrating that kinetically the WRR and HOR is not reversible on the Ni-YSZ cermet electrodes under SOFC and SOEC operation modes. The WRR can be described by two electrode processes associated with the H 2 O adsorption and diffusion on the oxygen-covered Ni or YSZ surface in the vicinities of TPB, followed by the charge transfer. The significant increase of high frequency electrode polarization resistance, R H and in much less extent low frequency electrode polarization resistance, R L with the dc bias indicates that the water electrolysis reaction is kinetically controlled by the reactant supply (e.g., the adsorbed H 2 O species) limited charge transfer process. Solid oxide electrolysis cell (SOEC) as an electrochemical device to convert electricity of renewable energy sources such as solar energy, wind power, hydropower and geothermal power into chemical energy of fuels such as hydrogen and syngas has attracted increasing interests due to the depleting fossil fuel sources, high oil prices and environmental considerations. [1][2][3][4][5][6][7] In the case of water electrolysis to produce hydrogen, steam is introduced to the hydrogen electrode side where it is reduced to hydrogen, while the oxygen ions are migrated through the electrolyte to the air electrode side where they combine to form pure oxygen. Co-electrolysis of steam and CO 2 in an SOEC yields synthesis gas (CO+H 2 ) which in turn can be catalysed to various types of synthetic fuels (such as methane and methanol). [8][9][10][11] SOECs are reversible operation of solid oxide fuel cells (SOFCs), and therefore in principle the electrode and electrolyte materials developed for SOFCs can be utilized for SOECs.Similar to SOFCs, Ni-yttria-stabilized zirconia (Ni-YSZ) cermets are the most common hydrogen electrodes for SOECs, due to its high electrical conductivity, high electrocatalytic activity, high thermal and structural stability and low price.1,12-14 The incorporation of electrocatalytically active nanoparticles such as doped ceria oxides and Rh metal in the Ni-YSZ hydrogen electrodes enhances the ionic conductivity and three phase boundaries (TPBs), and thus substantially enhances the electrocatalytic activity and/or stability fo...

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Oxidation of Hydrogen on Ni/Yttria‐Stabilized Zirconia Cermet Anodes

Cited by 282 publications

References 7 publications

Investigation of the electrochemical active thickness of solid oxide fuel cell anode

Investigation of the electrochemical active thickness of solid oxide fuel cell anode

Nickel Electrodeposition on Silver for the Development of Solid Oxide Fuel Cell Anodes and Catalytic Membranes

Mechanism and Kinetics of Ni-Y₂O₃-ZrO₂Hydrogen Electrode for Water Electrolysis Reactions in Solid Oxide Electrolysis Cells

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Oxidation of Hydrogen on Ni/Yttria‐Stabilized Zirconia Cermet Anodes

Cited by 282 publications

References 7 publications

Investigation of the electrochemical active thickness of solid oxide fuel cell anode

Investigation of the electrochemical active thickness of solid oxide fuel cell anode

Nickel Electrodeposition on Silver for the Development of Solid Oxide Fuel Cell Anodes and Catalytic Membranes

Mechanism and Kinetics of Ni-Y2O3-ZrO2Hydrogen Electrode for Water Electrolysis Reactions in Solid Oxide Electrolysis Cells

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Mechanism and Kinetics of Ni-Y₂O₃-ZrO₂Hydrogen Electrode for Water Electrolysis Reactions in Solid Oxide Electrolysis Cells