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Enhancing layered perovskite ferrites with ultra-high-density nanoparticles via cobalt doping for ceramic fuel cell anode

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Journal of Energy Chemistry 2024年第9期96卷 39-48页

作者： Shuo Zhai Rubao Zhao Hailong Liao Ling Fu Senran Hao Junyu Cai Yifan Wu Jian Wang Yunhong Jiang Jie Xiao Tao Liu Heping Xie State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering Shenzhen University&Sichuan UniversityShenzhen 518060GuangdongChina National and Local Joint Engineering Research Center for Lithium-ion Batteries and Materials Preparation Technology Key Laboratory of Advanced Battery Materials of Yunnan ProvinceFaculty of Metallurgical and Energy EngineeringKunming University of Science and TechnologyKunming 650093YunnanChina School of Energy and Environment City University of Hong KongKowloon 999077Hong KongChina

Nanoparticles anchored on the perovskite surface have gained considerable attention for their wide-ranging applications in heterogeneous catalysis and energy conversion due to their robust and integrated structural ***,we employ controlled Co doping to effectively enhance the nanoparticle exsolution process in layered perovskite ferrites *** alloy nanoparticles with ultra-high-density are exsolved on the(PrBa)_(0.95)(Fe_(0.8)Co_(0.1)Nb_(0.1))2O_(5+δ)(PBFCN_(0.1))surface under reducing atmosphere,providing significant amounts of reaction sites and good durability for hydrocarbon *** a reducing atmosphere,cobalt facilitates the reduction of iron cations within PBFCN_(0.1),leading to the formation of CoFe alloy *** formation is accompanied by a cation exchange process,wherein,with the increase in temperature,partial cobalt ions are substituted by ***,Co doping significantly enhance the electrical conductivity due to the stronger covalency of the Cosingle bondO bond compared with Fesingle bondO bond.A single cell with the configuration of PBFCN_(0.1)-Sm_(0.2)Ce_(0.8)O_(1.9)(SDC)|SDC|Ba_(0.5)Sr_(0.5)Co_(0.8)Fe_(0.2)O_(3−δ)(BSCF)-SDC achieves an extremely low polarization resistance of 0.0163Ωcm^(2)and a high peak power density of 740 mW cm^(−2)at 800℃.The cell also shows stable operation for 120 h in H_(2)with a constant current density of 285 mA cm^(−2).Furthermore,employing wet C_(2)H_(6)as fuel,the cell demonstrates remarkable performance,achieving peak power densities of 455 mW cm^(−2)at 800℃and 320 mW cm^(−2)at 750℃,marking improvements of 36%and 70%over the cell with(PrBa)_(0.95)(Fe_(0.9)Nb_(0.1))_(2)O_(5+δ)(PBFN)-SDC at these respective *** discovery emphasizes how temperature influences alloy nanoparticles exsolution within doped layered perovskite ferrites materials,paving the way for the development of high-performance ceramic fuel cell anodes.

关键词： Solid oxide fuel cell Anode Ethane fuel Nanoparticle Exsolution layered perovskite Ferrites

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Magnetocaloric and Colossal Magnetoresistance Effect in layered perovskite La_(1.4) Sr_(1.6)Mn_2O_7

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Journal of Materials Science & Technology 2010年第3期26卷 234-236页

作者： Li'an Han Changle Chen School of science Northwestern Polytechnical University Xi'an 710072 China Department of applied physics Xi'an University of Science and Technology Xi'an 710054 China

Magnetocaloric and colossal magnetoresistance effects of the layered perovskite La 1.4 Sr 1.6 Mn 2 O 7 compound have been studied.A broad peak of magnetic entropy change （-△S M） is found above the Curie temperature （T C =120 K）,which can be associated with the existence of two-dimensional short range ferromagnetic ***,the curvilinear shape of-△S M for layered perovskite is quite different from that of the Ln 1-x A x MnO 3 probably arising from magnetocrystalline *** the same time,a wide peak of colossal magnetoresitance effect near T C is found in the layered provskite La 1.4 Sr 1.6 Mn 2 O 7.

关键词： Magnetocaloric effect layered perovskite Colossal magnetoresistance

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Ferroelastic phase transitions in three new layered perovskites:(3-XC_(6)H_(5)CH_(2)CH_(2)NH_(3))_(2)[CdCl_(4)](X=F,Cl,and Br)

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Chinese Chemical Letters 2023年第12期34卷 470-475页

作者： Yaping Gong Xiaoxian Chen Bingqing Zhao Jun Wang Weixiong Zhang Xiaomin Chen MOE Key Laboratory of Bioinorganic and Synthetic Chemistry School of ChemistrySun Yat-Sen UniversityGuangzhou 510275China

Two-dimensional organic-inorganic hybrid ferroelastics with high-temperature reversible phase transitions are very rare and have become one of the research hotspots in the field of ferroelastic ***,we report three new layered organic-inorganic hybrid perovskites based on halogen-substituted phenethylaminium,(3-XC_(6)H_(5)CH_(2)CH_(2)NH_(3))_(2)[CdCl_(4)](X=F(1),CI(2)and Br(3)).They undergo structural phase transitions at 376/371 K,436/430 K,and 421/411 K,respectively,between the isomorphic hightemperature phases(space group I4/mmm,Z=2)and different room-temperature phases with the reduced structural symmetries,i.e.,P21/a(Z=2)in 1,Pi(Z=4)in 2,and P21/a(Z=4)in 3,*** ferroelastic transitions arise from the order-disorder transition of organic cations together with the synchronous displacement of inorganic layers,accompanying with feroelastic spontaneous strains of 0.16,0.13 and 0.12 for 1-3,*** enriching layered perovskite ferroelastics based on halogensubstituted cations,this work provides important clues for exploring new ferroic materials based on hybrid crystals.

关键词： layered perovskite Phase transition Halogen-substituted Ferroelastic Spontaneous strain

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Homogeneous nitrogen-doped(111)-type layered Sr5Nb4O15-xNx as a visible-light-responsive photocatalyst for water oxidation

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Nano Research 2022年第12期15卷 9976-9984页

作者： Shiwen Du Hai Zou Yunfeng Bao Yu Qi Xueshang Xin Shuowen Wang Zhaochi Feng Fuxiang Zhang State Key Laboratory of Catalysis Collaborative Innovation Center of Chemistry for Energy Materials(iChEM)Dalian National Laboratory for Clean EnergyDalian Institute of Chemical PhysicsChinese Academy of SciencesDalian116023China University of Chinese Academy of Sciences Beijing100049China

The development of visible-light-responsive photocatalysts for promoting solar-driven oxygen(O2)production from water splitting is a potentially attractive but still a challenging *** the present work,a(111)-type layered perovskite oxynitride,Sr5Nb4O15-xNx,was synthesized via the nitridation treatment of the disk-like oxide precursor under the ammonia flow,which was fabricated using a flux *** homogeneous dispersion of nitrogen(N)dopant in N-doped Sr5Nb4O15 was ascertained by energy-dispersive X-ray spectroscopy characterization,and the Sr5Nb4O15-xNx was found to be a direct semiconductor with a light absorption edge of approximately 640 *** functional theory investigation implies that the hybridization between the outmost N 2p orbitals and O 2p orbitals upshifts the original valence band maximum of Sr5Nb4O15 and endows its visible-light-responsive *** with cobalt oxide(CoOx)as cocatalyst,the as-prepared Sr5Nb4O15-xNx exhibited an enhanced photocatalytic O2 evolution activity from water splitting under visible-light illumination(λ>420 nm).Moreover,another homogeneous N-doped layered perovskite-type niobium(Nb)-based oxynitride,Ba5Nb4O15-xNx,was also developed and investigated for the visible-light-actuated O2 production,highlighting the versatility of the present approach for exploring novel visible-light-responsive photocatalysts.

关键词： nitrogen-doped visible-light-responsive layered perovskite oxygen(O2)evolution water splitting

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Phase Behavior of Rare Earth Manganites

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Journal of Rare Earths 2004年第5期22卷 582-585页

作者： NaokiKamegashira HiromiNakano GangChen JianMeng DepartmentofMaterialsScience ToyohashiUniversityofTechnologyTempaku-choToyohashi441-8580Japan ElectronMicroscopeLaboratory RyukokuUniversitySetaOtsu520-2194Japan DepartmentofAppliedChemistry SchoolofScienceHarbinInstituteofTechnologyHarbin150001China KeyLaboratoryofRareEarthChemistryandPhysics ChangchunInstituteofAppliedChemistryChineseAcademyofSciencesChangchun130022China

Among complex oxides containing rare earth and manganese BaLn_2Mn_2O_7 (Ln=rare earth) with the layered perovskite type and Ln_2(Mn, M)O_7 with pyrochlore-related structure were studied since these compounds show many kinds of phases and unique phase transitions. In BaLn_2Mn_2O_7 there appear many phases, depending on the synthetic conditions for each rare earth. The tetragonal phase of so-called Ruddlesden-Popper type is the fundamental structure and many kinds of deformed modification of this structure are obtained. For BaEu_2Mn_2O_7 at least five phases have been identified from the results of X-ray diffraction analysis with the space group P4_2/mnm, Fmmm, Immm and A2/m in addition to the fundamental tetragonal I4/mmm phase. In the pyrochlore-related type compounds, Ln_2Mn_(2-x)M_xO_7 (M=Ta, Nb, W etc), there also appear several phases with different crystal structures. With regard to every rare earth, Ln_2MnTaO_7 phase is stable only for excess Ta and can be obtained under high oxygen partial pressure process. This group has trigonal structure with zirkelite type (P3_121 space group). On the other hand Ln_2Mn_(2/3)Nb_(4/3)O_7 phase has monoclinic (C2/c space group) and zirconolite type structure. All of these structural models have the fundamental structure based on HTB (hexagonal tungsten bronze) layers formed by the arrangement of oxygen octahedra.

关键词： phase behavior layered perovskite pyrochlore-related structure rare earth manganese oxide

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Effect of Cu doping on the magnetic and electrical properties of n=2 Ruddlesden-Popper manganates

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Chinese Physics B 2005年第10期14卷 2117-2121页

作者：司继伟曹庆琪顾本喜都有为 National Laboratory of Solid State Microstructures and Department of Physics Nanjing University Nanjing 210093 China

A series of polycrystalline Cu-doped n=2 Ruddlesden-Popper manganates La1.2Sr1.8CuzMn（2-x）O7 （x=0, 0.04, 0.13） were synthesized by the solid state reaction method. The effect of Cu doping on the magnetic and transport properties has been studied. It is found that Cu substitution for Mn greatly affects the magnetic and electrical properties of the parent phase La1.2Sr1.8Mn2O7. With the increase of Cu content, the system undergoes a transition from longrange ferromagnetic order to the spin glass state and further to an antiferromagnetic order. A little of Cu dopant can lead to the samples showing semiconductor or insulator behaviour in the whole observed temperature range while the parent phase has a metal-insulator transition. These samples show colossal magnetoresistance at low temperatures and the value of it decreases with increasing Cu content.

关键词： layered perovskite magnetic and electrical properties spin glass

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有机-无机复合层状钙钛矿晶体的生长与性能研究

有机-无机复合层状钙钛矿晶体的生长与性能研究

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第五届新型太阳能电池学术研讨会

作者：党洋洋刘晓龙居佃兴陶绪堂胡文平天津大学天津化学化工协同创新中心&天津市分子光电科学重点实验室山东大学晶体材料研究所&晶体材料国家重点实验室

Hybrid layered perovskites have generated a great many of attentions due to their high stability in optoelectronic devices. However, restrained by the difficulties in the stability, crystal processing, and single-crystalline device fabrication based on prototype perovskites of CHNHPbI, there is a growing interest in finding a way to introduce long-chain organic ammonium into CHNHPbI to tackle with these challenges, leading to emerging layered perovskite materials with similar structures to graphene. Here, we first report the crystal growth in ambient atmosphere on single crystals of layered perovskite(n-CHNH)(CHNH)PbnI(n=3, 4) afforded using fine control of the molar ratio of perovskite precursors by top seeded solution growth(TSSG) method. The fundamental properties(band gap, PL and thermal stability) of(n-C HNH)(CHNH) PbnI(n=3, 4) single crystals are investigated.

关键词： layered perovskite Crystal growth Band gap Thermal stability

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