Achieving High Efficiency and Eliminating Degradation in Solid Oxide Electrochemical Cells Using High Oxygen‐Capacity Perovskite

Jun, Areum; Kim, Junyoung; Shin, Jeeyoung; Kim, Guntae

doi:10.1002/ange.201606972

Cited by 22 publications

(14 citation statements)

References 37 publications

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“…While the water splitting and oxygen reduction occur at the entire electrode surface, the improvement of mass transport is needed to make gas diffusion throughout electrode grains more necessary. The incorporation of the three-dimensional mesh-like PNC Kim et aI., 2016 38 Wang et aI., 2015 39 Chen et aI., 2015 40 Laguna-Bercero et aI., 2016 45 Ishihara et aI., 2016 46 Yang et aI., 2015 47 Peng et aI., 2010 41 Traversa et aI., 2015 42 Xie et aI., 2016 48 He et aI., 2017 49 Ding et aI., 2018 43 Kim et aI., 2018 44 Peng et aI., 2018 50 Liu et aI., 2018 51 Norby et aI., 2019 52 Haile et aI., 2019 53 electrode can make full use of the high porosity and active nanoparticles of nanofibers for superior performance. Our recent result has demonstrated that hydrogen production rate has been greatly improved by this self-architectured ultra porous layered perovskite PBSCF steam electrode 43 , e.g., 0.85 A cm −2 at 1.3 V and 600°C which was increased from regular electrode (0.55 A cm −2 ).…”

Section: Discussionmentioning

confidence: 99%

Self-sustainable protonic ceramic electrochemical cells using a triple conducting electrode for hydrogen and power production

et al. 2020

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The protonic ceramic electrochemical cell (PCEC) is an emerging and attractive technology that converts energy between power and hydrogen using solid oxide proton conductors at intermediate temperatures. To achieve efficient electrochemical hydrogen and power production with stable operation, highly robust and durable electrodes are urgently desired to facilitate water oxidation and oxygen reduction reactions, which are the critical steps for both electrolysis and fuel cell operation, especially at reduced temperatures. In this study, a triple conducting oxide of PrNi 0.5 Co 0.5 O 3-δ perovskite is developed as an oxygen electrode, presenting superior electrochemical performance at 400~600°C. More importantly, the selfsustainable and reversible operation is successfully demonstrated by converting the generated hydrogen in electrolysis mode to electricity without any hydrogen addition. The excellent electrocatalytic activity is attributed to the considerable proton conduction, as confirmed by hydrogen permeation experiment, remarkable hydration behavior and computations.

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Section: Discussionmentioning

confidence: 99%

Self-sustainable protonic ceramic electrochemical cells using a triple conducting electrode for hydrogen and power production

et al. 2020

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“…32,33 In the last few years, they have attracted attention as fuel electrodes of SOFCs and solid oxide electrolyzer cells due to their high oxygen ionic diffusion rate and high electronic conductivity. [34][35][36][37][38][39][40][41][42][43]…”

Section: Introductionmentioning

confidence: 99%

A-Site Ordered Double Perovskite with in Situ Exsolved Core–Shell Nanoparticles as Anode for Solid Oxide Fuel Cells

Hou

Yao

et al. 2019

ACS Appl. Mater. Interfaces

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A highly active anode material for solid oxide fuel cells resistant to carbon deposition is developed. Co-Fe co-doped La0.5Ba0.5MnO3-δ with a cubic-hexagonal heterogeneous stucture is synthesized through the pechini method. An A-site ordered double perovskite with Co0.94Fe0.06 alloyoxide core-shell nanoparticles on its surface is formed after reduction. The phase transition and the exsolution of the nanoparticles are investigated with X-ray diffraction, thermogravimetric analysis and high-resolution transmission electron microscope. The exsolved nanoparticles with the layered double perovskite supporter show a high catalytic activity. A single cell with that anode and a 300 μm-thick La0.8Sr0.2Ga0.8Mg0.2O3-δ electrolyte layer exhibits maximum power densities of 1479 and 503 mW cm -2 at 850 o C with wet hydrogen and wet methane fuels, respectively. Moreover, the single cell fed with wet methane exhibits a stable power output at 850 o C for 200 h, demonstrating a high resistance to carbon deposition of the anode due to the strong anchor of the exsolved nanoparticles on the perovskite parent. The oxide shell also preserves the metal particles from coking.

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“…Recently, layered perovskite structures have received considerable attention because of their interesting properties, such as high electrical conductivity, fast surface oxygen exchange and easy oxygen ion diffusion 14 15 16 17 . However, there have been very few reports focussed on exsolution in layered perovskites due to the lack of redox stable layered perovskites.…”

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confidence: 99%

Exsolution trends and co-segregation aspects of self-grown catalyst nanoparticles in perovskites

et al. 2017

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In perovskites, exsolution of transition metals has been proposed as a smart catalyst design for energy applications. Although there exist transition metals with superior catalytic activity, they are limited by their ability to exsolve under a reducing environment. When a doping element is present in the perovskite, it is often observed that the surface segregation of the doping element is changed by oxygen vacancies. However, the mechanism of co-segregation of doping element with oxygen vacancies is still an open question. Here we report trends in the exsolution of transition metal (Mn, Co, Ni and Fe) on the PrBaMn2O5+δ layered perovskite oxide related to the co-segregation energy. Transmission electron microscopic observations show that easily reducible cations (Mn, Co and Ni) are exsolved from the perovskite depending on the transition metal-perovskite reducibility. In addition, using density functional calculations we reveal that co-segregation of B-site dopant and oxygen vacancies plays a central role in the exsolution.

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Achieving High Efficiency and Eliminating Degradation in Solid Oxide Electrochemical Cells Using High Oxygen‐Capacity Perovskite

Cited by 22 publications

References 37 publications

Self-sustainable protonic ceramic electrochemical cells using a triple conducting electrode for hydrogen and power production

Self-sustainable protonic ceramic electrochemical cells using a triple conducting electrode for hydrogen and power production

A-Site Ordered Double Perovskite with in Situ Exsolved Core–Shell Nanoparticles as Anode for Solid Oxide Fuel Cells

Exsolution trends and co-segregation aspects of self-grown catalyst nanoparticles in perovskites

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