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  1. Article ; Online: Optimization of a Perovskite Oxide-Based Cathode Catalyst Layer on Performance of Direct Ammonia Fuel Cells

    Jeerh, Georgina / Zou, Peimiao / Zhang, Mengfei / Tao, Shanwen

    ACS Applied Materials & Interfaces. 2022 Dec. 27, v. 15, no. 1 p.1029-1041

    2022  

    Abstract: To maximize fuel cell performance, transport pathways for electrons, ions, and reactants should be connected well. This demands a well-constructed microstructure in the catalyst layer (CL). Herein we design and optimize a cathode CL for a direct ammonia ... ...

    Abstract To maximize fuel cell performance, transport pathways for electrons, ions, and reactants should be connected well. This demands a well-constructed microstructure in the catalyst layer (CL). Herein we design and optimize a cathode CL for a direct ammonia fuel cell (DAFC) using a perovskite oxide as the catalyst to reduce reliance on platinum group metals (PGMs). The effects of tailoring carbon, ionomer, and polytetrafluoroethylene (PTFE) content in cathode CLs (CCLs) were explored, and several DAFCs were tested. Using the same catalyst and operating conditions, the lowest maximum current density and peak power density obtained were 85.3 mA cm-² and 5.92 mW cm-², respectively, which substantially increased to 317 mA cm-² and 30.1 mW cm-² through proper carbon, ionomer, and PTFE optimization, illustrating the importance of an effective three-phase interface. The findings reveal that despite employment of an active catalyst for oxygen reduction at the cathode site, the true performance of the catalyst cannot be reflected unless it is supported by proper design of the CCL. The study also reveals that by optimizing the CCL, similar performances to those of Pt/C-based CCLs in literature can be obtained at a cost reduction.
    Keywords ammonia ; carbon ; catalysts ; cathodes ; cost effectiveness ; fuel cells ; fuels ; microstructure ; oxygen ; platinum ; polytetrafluoroethylene ; direct ammonia fuel cell (DAFC) ; perovskite ; cathode ; catalyst layer ; optimization
    Language English
    Dates of publication 2022-1227
    Size p. 1029-1041.
    Publishing place American Chemical Society
    Document type Article ; Online
    ISSN 1944-8252
    DOI 10.1021/acsami.2c17253
    Database NAL-Catalogue (AGRICOLA)

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  2. Article ; Online: A fast ceramic mixed OH

    Zou, Peimiao / Iuga, Dinu / Ling, Sanliang / Brown, Alex J / Chen, Shigang / Zhang, Mengfei / Han, Yisong / Fortes, A Dominic / Howard, Christopher M / Tao, Shanwen

    Nature communications

    2024  Volume 15, Issue 1, Page(s) 909

    Abstract: Low temperature ionic conducting materials such as ... ...

    Abstract Low temperature ionic conducting materials such as OH
    Language English
    Publishing date 2024-01-30
    Publishing country England
    Document type Journal Article
    ZDB-ID 2553671-0
    ISSN 2041-1723 ; 2041-1723
    ISSN (online) 2041-1723
    ISSN 2041-1723
    DOI 10.1038/s41467-024-45060-1
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Investigation of Perovskite Oxide SrCo

    Zou, Peimiao / Chen, Shigang / Lan, Rong / Tao, Shanwen

    ChemSusChem

    2019  Volume 12, Issue 12, Page(s) 2788–2794

    Abstract: Single-phase perovskite oxide ... ...

    Abstract Single-phase perovskite oxide SrCo
    Language English
    Publishing date 2019-05-22
    Publishing country Germany
    Document type Journal Article
    ISSN 1864-564X
    ISSN (online) 1864-564X
    DOI 10.1002/cssc.201900451
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article: A symmetric direct ammonia fuel cell using ternary NiCuFe alloy embedded in a carbon network as electrodes

    Zhang, Mengfei / Zhang, Jie / Jeerh, Georgina / Zou, Peimiao / Sun, Boyao / Walker, Marc / Xie, Kui / Tao, Shanwen

    Journal of materials chemistry A. 2022 Sept. 20, v. 10, no. 36

    2022  

    Abstract: Recently, due to the high energy density of ammonia, low source-to-tank energy cost and carbon free fuel, low-temperature direct ammonia fuel cells (DAFCs) have attracted extensive attention and play an important role in ammonia economy. In DAFCs, Pt- ... ...

    Abstract Recently, due to the high energy density of ammonia, low source-to-tank energy cost and carbon free fuel, low-temperature direct ammonia fuel cells (DAFCs) have attracted extensive attention and play an important role in ammonia economy. In DAFCs, Pt-based materials have been the most studied electrocatalysts for the anodic ammonia oxidation reaction (AOR) and cathodic oxygen reduction reaction (ORR) over the past decade. However, the high cost of precious metal has markedly inhibited the large-scale application of DAFCs. Herein, a bifunctional material of ternary Ni4Cu5Fex (x = 0, 0.5, 1, 3, 5) alloy embedded in a carbon network was prepared by a simple solvothermal approach, and showed superior activity and durability towards both AOR and ORR. The excellent bifunctional catalytic activity of the Ni4Cu5Fe1/C sample was analyzed by experimental and calculational methods. Utilizing the bifunctional activities of this alloy, a symmetric DAFC was assembled with Ni4Cu5Fe1/C as both the anode and cathode, with a commercial anion exchange membrane (AEM) as electrolyte. The symmetric DAFC-Ni4Cu5Fe1/C showed a maximum current density of 67 mA cm⁻² at 80 °C. To the best of our knowledge, this is the first report on a symmetric DAFC. This work not only reports a new AOR/ORR bifunctional catalyst, but also moves towards the development of low-cost DAFCs with simple structure.
    Keywords alloys ; ammonia ; anion-exchange membranes ; anodes ; carbon ; catalysts ; catalytic activity ; cathodes ; durability ; electrochemistry ; electrolytes ; energy costs ; energy density ; fuel cells ; fuels ; oxidation
    Language English
    Dates of publication 2022-0920
    Size p. 18701-18713.
    Publishing place The Royal Society of Chemistry
    Document type Article
    ZDB-ID 2702232-8
    ISSN 2050-7496 ; 2050-7488
    ISSN (online) 2050-7496
    ISSN 2050-7488
    DOI 10.1039/d2ta04129d
    Database NAL-Catalogue (AGRICOLA)

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  5. Article: Electricity Generation from Ammonia in Landfill Leachate by an Alkaline Membrane Fuel Cell Based on Precious-Metal-Free Electrodes

    Zhang, Mengfei / Zou, Peimiao / Jeerh, Georgina / Chen, Shigang / Shields, Jane / Wang, Huanting / Tao, Shanwen

    ACS sustainable chemistry & engineering. 2020 Aug. 06, v. 8, no. 34

    2020  

    Abstract: Ammonia contaminated wastewater poses a great hazard to the safety and quality of water resources. Use of ammonia fuel cells to remove ammonia from wastewater is a promising strategy, which not only eliminates ammonia but also generates electricity as a ... ...

    Abstract Ammonia contaminated wastewater poses a great hazard to the safety and quality of water resources. Use of ammonia fuel cells to remove ammonia from wastewater is a promising strategy, which not only eliminates ammonia but also generates electricity as a bonus. For ammonia fuel cells, the key challenge is to identify stable and highly active precious-metal-free catalysts to be used as electrodes. In this study, a composite material α-MnO₂/C was prepared through a simple reaction of potassium permanganate with carbon black in a concentrated H₂SO₄ solution. An alkaline membrane fuel cell was prepared using the as-synthesized α-MnO₂/C as the cathode, previously reported NiCu/C as the anode, and an alkaline membrane as the electrolyte. The electrochemical activities of the MnO₂/C cathode and the performance of this fuel cell utilizing ammonia as the fuel were investigated. Finally, leachate from a local landfill site was tested in the fuel cell. Without the addition of alkali, the ammonia concentration in landfill leachate was reduced from 2711 to 95 ppm. Over the operational period of approximately 6 h, 96.5% of the ammonia in the leachate was removed by the fuel cell. These results demonstrate that the ammonia present within wastewater can efficiently be removed by a fuel cell employing non-precious metal electrodes at room temperature, while simultaneously generating electricity as a bonus. This provides an exciting new technology for the treatment of ammonia-rich wastewater.
    Keywords ambient temperature ; ammonia ; anodes ; catalysts ; cathodes ; composite materials ; electricity ; electricity generation ; electrochemistry ; electrolytes ; fuel cells ; fuels ; landfill leachates ; landfills ; manganese dioxide ; potassium permanganate ; soot ; sulfuric acid ; technology ; wastewater ; water resources
    Language English
    Dates of publication 2020-0806
    Size p. 12817-12824.
    Publishing place American Chemical Society
    Document type Article
    ISSN 2168-0485
    DOI 10.1021/acssuschemeng.0c02926
    Database NAL-Catalogue (AGRICOLA)

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  6. Article: N,N-Dimethylacetamide-Diluted Nitrate Electrolyte for Aqueous Zn//LiMn₂O₄ Hybrid Ion Batteries

    Chen, Shigang / Sun, Pan / Humphreys, John / Zou, Peimiao / Zhang, Mengfei / Jeerh, Georgina / Sun, Boyao / Tao, Shanwen

    ACS applied materials & interfaces. 2021 Sept. 27, v. 13, no. 39

    2021  

    Abstract: N,N-Dimethylacetamide (DMA) cooperated with LiNO₃ salt has previously shown to be a promising electrolyte for a Li//O₂ battery, showing good stability against both the O₂ electrode reaction and Li stripping/plating. In this work, DMA is hybridized with a ...

    Abstract N,N-Dimethylacetamide (DMA) cooperated with LiNO₃ salt has previously shown to be a promising electrolyte for a Li//O₂ battery, showing good stability against both the O₂ electrode reaction and Li stripping/plating. In this work, DMA is hybridized with a concentrated nitrate electrolyte [2.5 m Zn(NO₃)₂ + 13 m LiNO₃ aqueous solution] for better electrochemical stability while using less dissolved salts. The widest electrochemical stability window for this DMA-diluted electrolyte is determined as 3.1 V, the negative critical stability potential of which is −1.6 V versus Ag/AgCl, indicating desirable stability against hydrogen evolution and Zn deposition. The findings can be attributed to the weakened Li⁺/Zn²⁺ solvation sheath caused by low permittivity of DMA, as revealed through Raman spectra characterization and molecular dynamics simulation. A Zn//Zn symmetrical cell and Zn//LiMn₂O₄ hybrid ion batteries are assembled in air directly, attributed to the stability of DMA toward O₂. Zn stripping/plating with a dendrite-free morphology is delivered for 110 h and 200 charge/discharge cycles under 1 C rate, achieving 99.0% Coulombic efficiency. The maximum capacity of the battery is 121.0 mA h·g–¹ under 0.2 C rate (based on the mass of LiMn₂O₄), delivering an energy density of 165.8 W h·kg–¹ together with 2.0 V working voltage. This work demonstrates the feasibility and validity of utilizing a relatively dilute electrolyte dissolved in oxygen for a highly stable aqueous rechargeable battery.
    Keywords air ; aqueous solutions ; batteries ; electric potential difference ; electrochemistry ; electrodes ; electrolytes ; energy density ; hydrogen production ; molecular dynamics ; nitrates ; oxygen ; solvation
    Language English
    Dates of publication 2021-0927
    Size p. 46634-46643.
    Publishing place American Chemical Society
    Document type Article
    ISSN 1944-8252
    DOI 10.1021/acsami.1c12911
    Database NAL-Catalogue (AGRICOLA)

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  7. Article ; Online: N

    Chen, Shigang / Sun, Pan / Humphreys, John / Zou, Peimiao / Zhang, Mengfei / Jeerh, Georgina / Sun, Boyao / Tao, Shanwen

    ACS applied materials & interfaces

    2021  Volume 13, Issue 39, Page(s) 46634–46643

    Abstract: ... ...

    Abstract N
    Language English
    Publishing date 2021-09-27
    Publishing country United States
    Document type Journal Article
    ISSN 1944-8252
    ISSN (online) 1944-8252
    DOI 10.1021/acsami.1c12911
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: An Efficient Symmetric Electrolyzer Based On Bifunctional Perovskite Catalyst for Ammonia Electrolysis.

    Zhang, Mengfei / Li, Hao / Duan, Xiuyun / Zou, Peimiao / Jeerh, Georgina / Sun, Boyao / Chen, Shigang / Humphreys, John / Walker, Marc / Xie, Kui / Tao, Shanwen

    Advanced science (Weinheim, Baden-Wurttemberg, Germany)

    2021  Volume 8, Issue 22, Page(s) e2101299

    Abstract: 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 ... ...

    Abstract 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
    Language English
    Publishing date 2021-10-08
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 2808093-2
    ISSN 2198-3844 ; 2198-3844
    ISSN (online) 2198-3844
    ISSN 2198-3844
    DOI 10.1002/advs.202101299
    Database MEDical Literature Analysis and Retrieval System OnLINE

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