Thermal-expansion offset for high-performance fuel cell cathodes

Zhang, Yuan; Chen, Bin; Guan, Daqin; Xu, M.; Ran, Ran; Ni, Meng; Zhou, Wei; O’Hayre, Ryan; Shao, Zongping

doi:10.1038/s41586-021-03264-1

Cited by 360 publications

(169 citation statements)

References 46 publications

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“…400–700 °C) can dramatically stimulate the commercialization of this attractive technology because such drop in operating temperature can effectively cut operating cost, prolong cell lifetime, and enable more flexible sealing. [ 4–6 ] The power output is an important parameter to determine the practical applicability of fuel cells. It is closely related to the polarization resistance of electrodes and the ohmic resistance of the electrolyte in fuel cells.…”

Section: Introductionmentioning

confidence: 99%

Building Ruddlesden–Popper and Single Perovskite Nanocomposites: A New Strategy to Develop High‐Performance Cathode for Protonic Ceramic Fuel Cells

Shi

et al. 2021

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Here a new strategy is unveiled to develop superior cathodes for protonic ceramic fuel cells (PCFCs) by the formation of Ruddlesden–Popper (RP)‐single perovskite (SP) nanocomposites. Materials with the nominal compositions of LaSrxCo1.5Fe1.5O10−δ (LSCFx, x = 2.0, 2.5, 2.6, 2.7, 2.8, and 3.0) are designed specifically. RP‐SP nanocomposites (x = 2.5, 2.6, 2.7, and 2.8), SP oxide (x = 2.0), and RP oxide (x = 3.0) are obtained through a facile one‐pot synthesis. A synergy is created between RP and SP in the nanocomposites, resulting in more favorable oxygen reduction activity compared to pure RP and SP oxides. More importantly, such synergy effectively enhances the proton conductivity of nanocomposites, consequently significantly improving the cathodic performance of PCFCs. Specifically, the area‐specific resistance of LSCF2.7 is only 40% of LSCF2.0 on BaZr0.1Ce0.7Y0.2O3−δ (BZCY172) electrolyte at 600 °C. Additionally, such synergy brings about a reduced thermal expansion coefficient of the nanocomposite, making it better compatible with BZCY172 electrolyte. Therefore, an anode‐supported PCFC with LSCF2.7 cathode and BZCY172 electrolyte brings an attractive peak power output of 391 mW cm−2 and excellent durability at 600 °C.

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Section: Introductionmentioning

confidence: 99%

Building Ruddlesden–Popper and Single Perovskite Nanocomposites: A New Strategy to Develop High‐Performance Cathode for Protonic Ceramic Fuel Cells

Shi

et al. 2021

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“…Cost‐effective bifunctional electrocatalysts with high activity for both oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) and superior durability are highly demanded for the commercial rechargeable zinc–air batteries (ZABs). [ 1–4 ] Precious metal‐based Pt/C and RuO 2 /IrO 2 are the state‐of‐art electrocatalysts for ORR and OER, respectively, however, their scarcity and high price inhibit their practical use in commercial products. [ 5–7 ] Therefore, other noble‐metal free electrocatalysts are urgently needed for ZABs.…”

Section: Introductionmentioning

confidence: 99%

A Controllable Dual Interface Engineering Concept for Rational Design of Efficient Bifunctional Electrocatalyst for Zinc–Air Batteries

Lü

Zou

et al. 2021

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Searching for bifunctional noble‐free electrocatalysts with high activity and stability are urgently demanded for the commercial application of zinc–air batteries (ZABs). Herein, the authors propose a controllable dual interface engineering concept to design a noble‐metal‐free bifunctional catalyst with two well‐designed interfaces (Ni3FeN|MnO and MnO|CNTs) via a simple etching and wet chemical route. The heterointerface between MnO and Ni3FeN facilitates the charge transfer rate during surface reaction, and heterointerface between MnO and carbon nanotubes (CNTs) support provides effective electron transfer path, while the CNTs matrix builds free diffusion channels for gas and electrolyte. Benefiting from the advantages of dual interfaces, Ni3FeN/MnO‐CNTs show superior oxygen reduction reaction and oxygen evolution reaction catalytic activity with an ultralow polarization gap (∆E) of 0.73 V, as well as preferable durability and rapid reaction kinetics. As proof of concept, the practical ZAB with Ni3FeN/MnO‐CNT exhibits high power density of 197 mW cm−2 and rate performance up to 40 mA cm−2, as well as superior cycling stability over 600 cycles, outperforming the benchmark mixture of Pt/C and RuO2. This work proposes a controllable dual interface engineering concept toward regulating the charge, electron, and gas transfer to achieve efficient bifunctional catalysts for ZABs.

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“…The results showed these two samples both presented a slightly initial weight loss during the heating process in air, which is correlated to the desorption of physically absorbed water or gases (Figure S13 , Supporting Information). [ 54 , 55 , 56 ] For LNCO55‐Air, the weight continued to decrease on heating due to the loss of adsorbed water and gas as well as the loss of lattice oxygen at evaluated temperatures. However, the weight decrease of the LNCO55‐Ar sample was much less than that of LNCO55‐Air due to the re‐oxidation of the oxide when heated in air.…”

Section: Resultsmentioning

confidence: 99%

An Efficient Symmetric Electrolyzer Based On Bifunctional Perovskite Catalyst for Ammonia Electrolysis

Zhang

Duan

et al. 2021

Advanced Science

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Ammonia is a natural pollutant in wastewater and removal technique such as ammonia electro-oxidation is of paramount importance. The development of highly efficient and low-costing electrocatalysts for the ammonia oxidation reaction (AOR) and hydrogen evolution reaction (HER) associated with ammonia removal is subsequently crucial. In this study, for the first time, the authors demonstrate that a perovskite oxide LaNi 0.5 Cu 0.5 O 3-𝜹 after being annealed in Ar (LNCO55-Ar), is an excellent non-noble bifunctional catalyst towards both AOR and HER, making it suitable as a symmetric ammonia electrolyser (SAE) in alkaline medium. In contrast, the LNCO55 sample fired in air (LNCO55-Air) is inactive towards AOR and shows very poor HER activity. Through combined experimental results and theoretical calculations, it is found that the superior AOR and HER activities are attributed to the increased active sites, the introduction of oxygen vacancies, the synergistic effect of B-site cations and the different active sites in LNCO55-Ar. At 1.23 V, the assembled SAE demonstrates ≈100% removal efficiency in 2210 ppm ammonia solution and >70% in real landfill leachate. This work opens the door for developments towards bifunctional catalysts, and also takes a profound step towards the development of low-costing and simple device configuration for ammonia electrolysers.

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Thermal-expansion offset for high-performance fuel cell cathodes

Cited by 360 publications

References 46 publications

Building Ruddlesden–Popper and Single Perovskite Nanocomposites: A New Strategy to Develop High‐Performance Cathode for Protonic Ceramic Fuel Cells

Building Ruddlesden–Popper and Single Perovskite Nanocomposites: A New Strategy to Develop High‐Performance Cathode for Protonic Ceramic Fuel Cells

A Controllable Dual Interface Engineering Concept for Rational Design of Efficient Bifunctional Electrocatalyst for Zinc–Air Batteries

An Efficient Symmetric Electrolyzer Based On Bifunctional Perovskite Catalyst for Ammonia Electrolysis

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