The development of low-temperature solid oxide fuel cells(LT-SOFCs)is of significant importance for realizing the widespread application of SOFCs.This has stimulated a substantial materials research effort in developi...The development of low-temperature solid oxide fuel cells(LT-SOFCs)is of significant importance for realizing the widespread application of SOFCs.This has stimulated a substantial materials research effort in developing high oxide-ion conductivity in the electrolyte layer of SOFCs.In this context,for the first time,a dielectric material,CaCu_(3)Ti_(4)O_(12)(CCTO)is designed for LT-SOFCs electrolyte application in this study.Both individual CCTO and its heterostructure materials with a p-type Ni_(0.8)Co_(0.15)Al_(0.05)LiO_(2−δ)(NCAL)semiconductor are evaluated as alternative electrolytes in LT-SOFC at 450–550℃.The single cell with the individual CCTO electrolyte exhibits a power output of approximately 263 mW cm^(-2) and an open-circuit voltage(OCV)of 0.95 V at 550℃,while the cell with the CCTO–NCAL heterostructure electrolyte capably delivers an improved power output of approximately 605 mW cm^(-2) along with a higher OCV over 1.0 V,which indicates the introduction of high hole-conducting NCAL into the CCTO could enhance the cell performance rather than inducing any potential short-circuiting risk.It is found that these promising outcomes are due to the interplay of the dielectric material,its structure,and overall properties that led to improve electrochemical mechanism in CCTO–NCAL.Furthermore,density functional theory calculations provide the detailed information about the electronic and structural properties of the CCTO and NCAL and their heterostructure CCTO–NCAL.Our study thus provides a new approach for developing new advanced electrolytes for LT-SOFCs.展开更多
通过固相反应法、甘氨酸-硝酸盐燃烧法和聚丙烯酰胺溶胶凝胶法合成了La_(0.9)Sr_(0.1)Ga_(0.8)Mg_(0.2)O_(2.85)(LSGM)粉体,并与二元碳酸盐复合,制备了低温下具有高离子电导率和良好稳定性的新型LSGM-(Li/Na)_2CO_3复合电解质。研究了L...通过固相反应法、甘氨酸-硝酸盐燃烧法和聚丙烯酰胺溶胶凝胶法合成了La_(0.9)Sr_(0.1)Ga_(0.8)Mg_(0.2)O_(2.85)(LSGM)粉体,并与二元碳酸盐复合,制备了低温下具有高离子电导率和良好稳定性的新型LSGM-(Li/Na)_2CO_3复合电解质。研究了LSGM粉体制备方法和二元碳酸盐含量对复合电解质性能的影响。结果表明,LSGM-碳酸盐复合电解质存在电导跃迁温度,且在跃迁温度以上电导率明显提高,600和450℃时分别高达0.122和0.08 S·cm^(-1)。以LSGM-碳酸盐复合物为电解质的单电池表现了良好的性能输出,600和500℃时最高输出功率密度可达617和311 m W·cm^(-2)。同时,电池输出功率和开路电压(OCV)受LSGM形貌、尺寸和碳酸盐含量的影响,以碳酸盐含量为20%(质量分数)的复合物为电解质的单电池性能最佳。展开更多
To enhance the performance and widespread use of solid oxide fuel cells(SOFCs),addressing the low-temperature(<650℃)electrochemical performance and operational stability issues of cathode materials is crucial.Here...To enhance the performance and widespread use of solid oxide fuel cells(SOFCs),addressing the low-temperature(<650℃)electrochemical performance and operational stability issues of cathode materials is crucial.Here,we propose an innovative approach to enhance oxygen ion mobility and electrochemical performance of perovskite oxide by substituting some oxygen sites with chlorine anions.The designed SrTa_(0.1)Fe_(0.9)O_(3-δ-x)Clx(x=0.05 and 0.10)exhibits improved performance compared to SrTa_(0.1)Fe_(0.9)O_(3-δ)(STF).SrTa_(0.1)Fe_(0.9)O_(2.95-δ)Cl_(0.05)(STFCl0.05)shows the lowest area-specific resistance(ASR)value on Sm0.2Ce0.8O1.9(SDC)electrolyte.At 600℃,STFCl0.05 achieves an ASR value of 0.084Ω·cm^(2),and a single cell with STFCl0.05 reaches a higher peak power density(PPD)value(1143 mW·cm^(-2))than that with STF(672 mW·cm^(-2)).Additionally,besides exhibiting excellent oxygen reduction reaction(ORR)activity at lower temperatures,the STFCl0.05 cathode demonstrates good CO_(2)tolerance and operational stability.Symmetrical cell operation lasts for 150 h,and single cell operation endures for 720 h without significant performance decline.The chlorine doping approach effectively enhances ORR activity and stability,making STFCl0.05 a promising cathode material for low-temperature SOFCs.展开更多
基金National Natural Science Foundation of China(NSFC)supported this work under Grant No.32250410309,11674086,51736006,and 51772080funding from Science and Technology Department of Jiangsu Province under Grant No.BE2022029Shenzhen University under Grant No.86902/000248 also supported part of this work.
文摘The development of low-temperature solid oxide fuel cells(LT-SOFCs)is of significant importance for realizing the widespread application of SOFCs.This has stimulated a substantial materials research effort in developing high oxide-ion conductivity in the electrolyte layer of SOFCs.In this context,for the first time,a dielectric material,CaCu_(3)Ti_(4)O_(12)(CCTO)is designed for LT-SOFCs electrolyte application in this study.Both individual CCTO and its heterostructure materials with a p-type Ni_(0.8)Co_(0.15)Al_(0.05)LiO_(2−δ)(NCAL)semiconductor are evaluated as alternative electrolytes in LT-SOFC at 450–550℃.The single cell with the individual CCTO electrolyte exhibits a power output of approximately 263 mW cm^(-2) and an open-circuit voltage(OCV)of 0.95 V at 550℃,while the cell with the CCTO–NCAL heterostructure electrolyte capably delivers an improved power output of approximately 605 mW cm^(-2) along with a higher OCV over 1.0 V,which indicates the introduction of high hole-conducting NCAL into the CCTO could enhance the cell performance rather than inducing any potential short-circuiting risk.It is found that these promising outcomes are due to the interplay of the dielectric material,its structure,and overall properties that led to improve electrochemical mechanism in CCTO–NCAL.Furthermore,density functional theory calculations provide the detailed information about the electronic and structural properties of the CCTO and NCAL and their heterostructure CCTO–NCAL.Our study thus provides a new approach for developing new advanced electrolytes for LT-SOFCs.
文摘通过固相反应法、甘氨酸-硝酸盐燃烧法和聚丙烯酰胺溶胶凝胶法合成了La_(0.9)Sr_(0.1)Ga_(0.8)Mg_(0.2)O_(2.85)(LSGM)粉体,并与二元碳酸盐复合,制备了低温下具有高离子电导率和良好稳定性的新型LSGM-(Li/Na)_2CO_3复合电解质。研究了LSGM粉体制备方法和二元碳酸盐含量对复合电解质性能的影响。结果表明,LSGM-碳酸盐复合电解质存在电导跃迁温度,且在跃迁温度以上电导率明显提高,600和450℃时分别高达0.122和0.08 S·cm^(-1)。以LSGM-碳酸盐复合物为电解质的单电池表现了良好的性能输出,600和500℃时最高输出功率密度可达617和311 m W·cm^(-2)。同时,电池输出功率和开路电压(OCV)受LSGM形貌、尺寸和碳酸盐含量的影响,以碳酸盐含量为20%(质量分数)的复合物为电解质的单电池性能最佳。
基金the support of the National Key Research and Development Program of China(No.2022YFB4002502supported by the National Natural Science Foundation of China(Nos.22309067 and 22101150)+1 种基金the Open Project Program of the State Key Laboratory of Materials-Oriented Chemical Engineering(No.KL21-05)the Marine Equipment and Technology Institute,Jiangsu University of Science and Technology(No.XTCX202404).
文摘To enhance the performance and widespread use of solid oxide fuel cells(SOFCs),addressing the low-temperature(<650℃)electrochemical performance and operational stability issues of cathode materials is crucial.Here,we propose an innovative approach to enhance oxygen ion mobility and electrochemical performance of perovskite oxide by substituting some oxygen sites with chlorine anions.The designed SrTa_(0.1)Fe_(0.9)O_(3-δ-x)Clx(x=0.05 and 0.10)exhibits improved performance compared to SrTa_(0.1)Fe_(0.9)O_(3-δ)(STF).SrTa_(0.1)Fe_(0.9)O_(2.95-δ)Cl_(0.05)(STFCl0.05)shows the lowest area-specific resistance(ASR)value on Sm0.2Ce0.8O1.9(SDC)electrolyte.At 600℃,STFCl0.05 achieves an ASR value of 0.084Ω·cm^(2),and a single cell with STFCl0.05 reaches a higher peak power density(PPD)value(1143 mW·cm^(-2))than that with STF(672 mW·cm^(-2)).Additionally,besides exhibiting excellent oxygen reduction reaction(ORR)activity at lower temperatures,the STFCl0.05 cathode demonstrates good CO_(2)tolerance and operational stability.Symmetrical cell operation lasts for 150 h,and single cell operation endures for 720 h without significant performance decline.The chlorine doping approach effectively enhances ORR activity and stability,making STFCl0.05 a promising cathode material for low-temperature SOFCs.
