Improving the activity and stability of Ni-based electrodes for solid oxide cells through surface engineering: Recent progress and future perspectives

Pan, Junxian; Ye, Yongjian; Zhou, Min-Bo; Sun, Xiang; Ling, Yihan; Yashiro, Keiji; Chen, Yan

doi:10.1016/j.matre.2021.100025

Cited by 14 publications

(13 citation statements)

References 129 publications

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“…Hydrocarbons such as CO and CO 2 are produced through surface oxidation (reactions R3 and R4). In the case of fast kinetics for breaking C-H bonds and sluggish transmission of oxygen ions, large amount of carbon deposition would occur [158]. In the case of fast oxygen ion transfer on the electrode, deposited carbon species can be eliminated.…”

Section: Degradation Of the Ni-ysz Electrode Due To Carbon Depositionmentioning

confidence: 99%

“…In the case of fast oxygen ion transfer on the electrode, deposited carbon species can be eliminated. Amorphous and graphite structure are two common types of carbon deposition in Ni-YSZ cermet which can be detected by D-band (1360 cm −1 , amorphous) and G-band (1580 cm −1 , graphite) of Raman spectrum [158,159]. The ratio of the bands peak intensities can be used to evaluate the structural order as well as sizes of the deposited carbon components [160].…”

Section: Degradation Of the Ni-ysz Electrode Due To Carbon Depositionmentioning

confidence: 99%

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Microstructure and long-term stability of Ni–YSZ anode supported fuel cells: a review

et al. 2022

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Nickel-yttria stabilized zirconia (Ni-YSZ) cermet is the most commonly used anode in solid oxide fuel cells (SOFCs). The current article provides an insight into parameters which affect cell performance and stability by reviewing and discussing the related publications in this field. Understanding the parameters which affect the microstructure of Ni-YSZ such as grain size and ratio of Ni to YSZ, volume fraction of porosity, pore size and its distribution, tortuosity factor, characteristic pathway diameter and density of triple phase boundaries (TPBs) is the key to design a fuel cell which shows high electrochemical performance. Lack of stability has been the main barrier to commercialization of SOFC technology. Parameters influencing the degradation of Ni-YSZ supported SOFCs such as Ni migration inside the anode during prolonged operation are discussed. The longest Ni-supported SOFC tests reported so far are examined and the crucial role of chromium poisoning due to interconnects (ICs), stack design and operating conditions in degradation of SOFCs is highlighted. The importance of calcination and milling of YSZ on development of porous structures suitable for Ni infiltration is explained and several methods to improve the electrochemical performance and stability of Ni-YSZ anode supported SOFCs are suggested.

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Section: Degradation Of the Ni-ysz Electrode Due To Carbon Depositionmentioning

confidence: 99%

Section: Degradation Of the Ni-ysz Electrode Due To Carbon Depositionmentioning

confidence: 99%

Microstructure and long-term stability of Ni–YSZ anode supported fuel cells: a review

et al. 2022

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“…Nonetheless, integrating electricity from renewable sources with existing grid systems remains a formidable challenge due to their seasonality and intermittency . Developing highly efficient and large-scale electrolysis systems that directly convert electrical energy into chemical energy carriers offers a promising solution for energy storage . Among various electrolysis techniques, proton-conducting electrolysis cells (PCECs), which are solid oxide electrolysis cells based on proton conductors, are regarded as a promising technology.…”

Section: Introductionmentioning

confidence: 99%

“…1 Developing highly efficient and large-scale electrolysis systems that directly convert electrical energy into chemical energy carriers offers a promising solution for energy storage. 2 Among various electrolysis techniques, protonconducting electrolysis cells (PCECs), which are solid oxide electrolysis cells based on proton conductors, are regarded as a promising technology. PCECs can effectively store electrical energy by producing dry hydrogen through water electrolysis.…”

Section: Introductionmentioning

confidence: 99%

Revealing the Impact of Steam Concentration on the Activity and Stability of Double-Perovskite Air Electrodes for Proton-Conducting Electrolysis Cells

Pan

Zhou

et al. 2022

Energy Fuels

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Great efforts have been devoted to developing high-performance air electrodes for proton-conducting electrolysis cells (PCECs). However, the stability of existing air electrodes still cannot meet the requirement for practical applications, and the degradation mechanisms require further investigation. Herein, taking porous PrBa 0.5 Sr 0.5 Co 1.5 Fe 0.5 O 5+δ (PBSCF)−BaZr 0.1 Ce 0.7 Y 0.1 Yb 0.1 O 3−δ (BZCYYb) composite air electrode as the model system, we systematically investigate the impact of steam concentration on the activity and stability of the electrode. The electrode exhibits reduced electrochemical impedance and improved Faradaic efficiency under high steam concentrations. Nevertheless, the hydrogen production performance of the cell degrades rapidly when operating under high steam concentrations (>30%). Such degradation of the cell is mainly attributed to the agglomeration and cation (especially Sr and Ba) segregation of PBSCF, and the decreased oxygen vacancies in BZCYYb caused highly concentrated steams. Our results clarify the critical role of steam on the activity and stability of the air electrode for PCECs. The findings can help guide the development of robust and active catalysts for other high-temperature electrochemical devices.

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“…The focus of DRM research, therefore, is shifting towards searching for highly active and durable catalysts without any dilution gases. [12][13][14] Meanwhile, triple-phase boundary (TPB) as the interfacial active site where a gaseous reactant, electronic conductor, and ionic conductor intersect has been studied extensively in the field of electrochemistry (for example, O 2 (g), electron, and O 2À for oxygen reduction reaction in conducting oxide energy system, such as solid oxide fuel cells), [15][16][17] but it has not been fully studied in other fields such as thermochemistry. In the DRM thermochemical reaction, for example, both CO 2 and CH 4 undergo the adsorption followed by dissociation steps, and it is known that each step occurs mainly on support and metal, respectively.…”

Section: Introductionmentioning

confidence: 99%

Precise Modulation of Triple‐Phase Boundaries towards a Highly Functional Exsolved Catalyst for Dry Reforming of Methane under a Dilution‐Free System

Joo

Lim

et al. 2022

Angewandte Chemie

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Dry reforming of methane (DRM) has been emerging as a viable solution to achieving carbon neutrality enhanced by the Paris Agreement as it converts the greenhouse gases of CO2 and CH4 into industrially useful syngas. However, there have been limited studies on the DRM catalyst under mild operating conditions with a high dilution gas ratio due to their deactivation from carbon coking and metal sintering. Herein, we apply the triple‐phase boundary (TPB) concept to DRM catalyst via exsolution phenomenon that can secure elongated TPB by controlling the Fe‐doping ratio in perovskite oxide. Remarkably, the exsolved catalyst with prolongated TPB shows exceptional CO2 and CH4 conversion rates of 95.9 % and 91.6 %, respectively, stable for 1000 hours under a dilution‐free system. DFT calculations confirm that the Lewis acid of support and Lewis base of metal at the TPB promote the adsorption of reactants, resulting in lowering the overall CO2 dissociation and CH4 dehydrogenation energy.

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Improving the activity and stability of Ni-based electrodes for solid oxide cells through surface engineering: Recent progress and future perspectives

Cited by 14 publications

References 129 publications

Microstructure and long-term stability of Ni–YSZ anode supported fuel cells: a review

Microstructure and long-term stability of Ni–YSZ anode supported fuel cells: a review

Revealing the Impact of Steam Concentration on the Activity and Stability of Double-Perovskite Air Electrodes for Proton-Conducting Electrolysis Cells

Precise Modulation of Triple‐Phase Boundaries towards a Highly Functional Exsolved Catalyst for Dry Reforming of Methane under a Dilution‐Free System

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