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Nb-doped PrBa_(0.8)Ca_(0.2)Co_(2)O_(6)-based perovskite cathode with improved oxygen reduction reaction activity and stability for solid oxide fuel cells

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Journal of Advanced Ceramics 2024年第10期13卷 1590-1599页

作者： Depeng Zeng Feng Zhu Kang Xu Hua Zhang Yangsen Xu Yu Chen School of Environment and Energy South China University of TechnologyGuangzhou 510006China

The performance of a solid oxide fuel cell(SOFC)is strongly associated with the activity and durability of the cathode,where the oxygen reduction reaction *** this study,we report our findings in the development of an Nb-doped PrBa_(0.8)Ca_(0.2)Co_(2)O_(6-δ)(PrBa_(0.8)Ca_(0.2)Co_(2-x)Nb_(x)O_(6-δ),x=0,0.025,0.05,and 0.1,denoted as PBCCNx)perovskite composite as the SOFC *** of X-ray diffraction(XRD)patterns and energy-dispersive transmission electron microscopy(TEM-EDS)images suggest that after being treated at 950℃ in air,PBCCN0.05 mainly contains phases of Ca-and Nb-doped PrBaCo2O6-δdouble perovskite,PrCoO_(3) perovskite with Ca and Nb doping,and Ba_(3)Ca_(1.18)Nb_(1.82)O_(9-δ).When evaluated as an SOFC cathode,the PBCCN0.05 mixture has shown a low polarization resistance of 0.0074Ω·cm^(2)at 800℃ in La_(0.8)Sr0.2Ga_(0.8)Mg_(0.2)O_(3)electrolyte symmetrical ***,anode-supported single cells with a configuration of Ni-Zr_(0.84)Y_(0.16)O_(2-δ)(YSZ)/YSZ/Gd_(0.1)Ce0.9O_(2-δ)/PBCCN0.05 display high electrochemical performance,with a peak power density of 1.81 W·cm^(-2)and a reasonable durability of 100 h at 800℃.PBCCN_(0.05)possesses a higher concentration of oxygen vacancies,a faster oxygen surface adsorption-dissociation rate,and an increased mass ratio of PrCoO_(3) perovskite with Ca and Nb doping compared to PrBa_(0.8)Ca_(0.2)Co_(2)O_(6)-δwithout Nb doping.

关键词： self-assembly Nb doping cathodes oxygen reduction reactions solid oxide fuel cells(SOFCs)

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Interface engineering of an electrospun nanofiber-based composite cathode for intermediate-temperature solid oxide fuel cells

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International Journal of Extreme Manufacturing 2023年第1期5卷 345-353页

作者： Seo Ju Kim Deokyoon Woo Donguk Kim Tae Kyeong Lee Jaeyeob Lee Wonyoung Lee School of Mechanical Engineering Sungkyunkwan UniversitySuwonKyunggi-do 16419Republic of Korea SKKU Institute of Energy Science and Technology(SIEST) Sungkyunkwan UniversitySuwon 16419Republic of Korea

Sluggish oxygen reduction reaction(ORR)kinetics are a major obstacle to developing intermediate-temperature solid-oxide fuel cells(IT-SOFCs).In particular,engineering the anion defect concentration at an interface between the cathode and electrolyte is important for facilitating ORR kinetics and hence improving the electrochemical *** developed the yttria-stabilized zirconia(YSZ)nanofiber(NF)-based composite cathode,where the oxygen vacancy concentration is controlled by varying the dopant cation(Y2O3)ratio in the YSZ *** composite cathode with the optimized oxygen vacancy concentration exhibits maximum power densities of 2.66 and 1.51 W cm^(−2)at 700 and 600℃,respectively,with excellent thermal stability at 700℃ over 500 h under 1.0 A cm^(−2).Electrochemical impedance spectroscopy and distribution of relaxation time analysis revealed that the high oxygen vacancy concentration in the NF-based scaffold facilitates the charge transfer and incorporation reaction occurred at the interfaces between the cathode and *** results demonstrate the high feasibility and potential of interface engineering for achieving IT-SOFCs with higher performance and stability.

关键词： solid oxide fuel cells nanofiber infiltration oxygen reduction reactions oxygen vacancy

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Establishing a theoretical insight for penta-coordinated ironnitrogen-carbon catalysts toward oxygen reaction

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Nano Research 2022年第7期15卷 6067-6075页

作者： Ruihu Lu Chenxi Quan Chengyi Zhang Qiu He Xiaobin Liao Zhaoyang Wang Yan Zhao State Key Laboratory of Silicate Materials for Architectures International School of Materials Science and EngineeringWuhan University of TechnologyWuhan 430070China The Institute of Technological Sciences Wuhan UniversityWuhan 430072China

Developing highly active iron-nitrogen-carbon catalysts for electrocatalytic oxygen reduction reactions(ORR)is pivotal to future energy *** penta-coordinated Fe-N-C with an augmented activity toward the oxygen reduction has been regarded as one of the promising candidates to replace platinum-based ORR ***,the lack of pertinent fundamental understanding hinders further optimizing the catalytic activity of such ***,through density functional theory(DFT)calculations,we systematically investigated the catalytic activity and ligand/metal coordination effects of 17 penta-coordinated FeN-C catalysts(labeled as FeNC-Xs,X denotes axial ligand).Our results not only show the theoretical overpotential of FeNC-Xs is lower than that of conventional tetra-coordinated Fe-N-C catalysts(labeled as FeNC),verifying the preeminent performance of FeNC-Xs,but also further indicate that the axial coordination effect of X ligands can decrease the orbital hybridization of Fe active center with ORR-relevant intermediates,sequentially accelerating the *** importantly,we reveal that the catalytic activity of FeNC-Xs increases with a decreased electronegativity of X ligands,which can be utilized to describe the axial coordination effect for *** findings can deeply advance the understanding of penta-coordinated iron-nitrogencarbon catalysts,which provide timely guidelines for designing optimum Fe-N-C based catalysts.

关键词： iron-nitrogen-carbon catalysts axial ligands first-principles calculations oxygen reduction reactions orbital hybridization

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Understanding oxygen reactions in aprotic Li-O2 batteries

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Chinese Physics B 2016年第1期25卷 58-67页

作者：马顺超张业龙崔清华赵婧彭章泉 State Key Laboratory of Electroanalytical Chemistry and Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China University of Chinese Academy of Sciences Beijing 100039China

Although significant progress has been made in many aspects of the emerging aprotic Li-O2 battery system, an indepth understanding of the oxygen reactions is still underway. The oxygen reactions occurring in the positive electrode distinguish Li-O2 batteries from the conventional Li-ion cells and play a crucial role in the Li-O2 cell＇s performance （capacity, rate capability, and cycle life）. Recent advances in fundamental studies of oxygen reactions in aprotic Li-O2 batteries are reviewed, including the reaction route, kinetics, morphological evolution of Li2O2, and charge transport within Li2O2. Prospects are also provided for future fundamental investigations of Li-O2 chemistry.

关键词： Li-O2 batteries oxygen reduction reactions oxygen evolution reactions kinetics

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oxygen Electroreduction Performance of Ultrasmall Gold Nanoclusters

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Chinese Journal of Chemical Physics 2018年第1期31卷 66-70,I0001页

作者：黄婷孙治湖潘国强中国科学技术大学国家同步辐射实验室

Ultrasmall gold nanoclusters consisting of 2-4 Au atoms were synthesized and their per- formance in electrocatalytic oxygen reduction reactions （ORR） was examined. These clus- ters were synthesized by exposing AuPPh3Cl to the aqueous ammonia medium for one week. Electrospray ionization mass spectrometry （ESI-MS）, X-ray absorption fihe struc- ture （XAFS）, and X-ray photoelectron spectroscopy （XPS） analyses indicate that the as- synthesized gold clusters （abbreviated as Aux） consist of 2-4 Au atoms coordinated by the triphenylphosphine, hydroxyl, and adsorbed oxygen ligands. A glassy carbon disk electrode loaded with the Aux clusters （Aux/GC） was characterized by the cyclic and linear-sweep voltammetry for ORR. The cyclic voltammogram vs. RHE shows the onset potential of 0.87 V, and the kinetic parameters of JK at 0.47 V and the electron-transfer mmlber per oxygen molecule were calculated to be 14.28 mA/cm2 and 3.96 via the Koutecky-Levich equations, respectively.

关键词： Ultrasmall gold nanoclusters Synthesis oxygen reduction reactions Electro-catalyst

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Advances in ORR,OER,and HER of fullerenes and derivatives:From DFT calculations to experimental identification

Advanced Sensor and Energy Materials

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Advanced Sensor and Energy Materials 2023年第2期2卷 105-120页

作者： Ao Yu Nimanyu Joshi Wei Zhang Yang Yang NanoScience Technology Center University of Central FloridaOrlandoFL 32826USA Department of Materials Science and Engineering University of Central FloridaOrlandoFL 32826USA Renewable Energy and Chemical Transformation Cluster University of Central FloridaOrlandoFL 32826USA Department of Chemistry University of Central FloridaOrlandoFL 32826USA The Stephen W.Hawking Center for Microgravity Research and Education University of Central FloridaOrlandoFL 32826USA

Fullerenes are widely applied in the field of ORR,OER,and HER due to their well-defined molecular structures,excellent electron affinity potential that can be used to regulate the electronic structures when composited with other materials,theπ-πintermolecular self-assembly into super crystals,and the customizable chemical modifications including heteroatom doping,metal encapsulation,and *** advantages endow fullerene with a great number of derivates and *** theoretical and experimental works are reported on *** better understand the study progress,herein,we give a common review of the latest *** first introduce the theoretical calculations of fullerenes and their derivates towards ORR,OER,and HER,aiming to give understandable reaction mechanisms and electrocatalytic active ***,the experimental identification of the electrocatalytic performance was *** experimental section is organized based on fullerene-based composites including fullerene/carbon composites,fullerene/sulfide composites,fullerene/LDH or metal composites,and fullerene molecular and its derivates including fullerene crystals,fullertubes,as well as endohedral ***,the challenges and opportunities for rational designing of electrocatalysts using fullerene as a precursor or additive are summarized and *** review not only points out the recent progress in fullerene application in electrocatalysts but also gives an in-depth insight into the materials design theoretically and experimentally that helps the future study directions.

关键词： Fullerenes Electrocatalysts DFT calculations oxygen reduction reactions oxygen evolution reactions Hydrogen evolution reactions

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