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
采用溶胶-凝胶法制备了CaCu_(3)Ti_(4)O_(12)粉体,压制成型工艺和传统烧结工艺制备了CaCu_(3)Ti_(4)O_(12)陶瓷样品,研究了CaCu_(3)Ti_(4)O_(12)陶瓷的相结构与烧结工艺的关系,表征并讨论了CaCu_(3)Ti_(4)O_(12)陶瓷的负温度系数(NTC,Ne...采用溶胶-凝胶法制备了CaCu_(3)Ti_(4)O_(12)粉体,压制成型工艺和传统烧结工艺制备了CaCu_(3)Ti_(4)O_(12)陶瓷样品,研究了CaCu_(3)Ti_(4)O_(12)陶瓷的相结构与烧结工艺的关系,表征并讨论了CaCu_(3)Ti_(4)O_(12)陶瓷的负温度系数(NTC,Negative Temperature Coefficient)电阻特性,如电阻率(ρ)、热敏常数(B)、线性度和迟滞。实验结果证明:所制备的陶瓷坯体经950℃、1000℃、1050℃和1100℃烧结后可得到纯钙钛矿相的CaCu_(3)Ti_(4)O_(12)陶瓷;同时具有良好的NTC特性,室温电阻率(ρ25)为1.5×107Ω·cm,热敏常数为6223~6874 K;线性度和迟滞分别为1.50%和1.00%。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.
文摘采用溶胶-凝胶法制备了CaCu_(3)Ti_(4)O_(12)粉体,压制成型工艺和传统烧结工艺制备了CaCu_(3)Ti_(4)O_(12)陶瓷样品,研究了CaCu_(3)Ti_(4)O_(12)陶瓷的相结构与烧结工艺的关系,表征并讨论了CaCu_(3)Ti_(4)O_(12)陶瓷的负温度系数(NTC,Negative Temperature Coefficient)电阻特性,如电阻率(ρ)、热敏常数(B)、线性度和迟滞。实验结果证明:所制备的陶瓷坯体经950℃、1000℃、1050℃和1100℃烧结后可得到纯钙钛矿相的CaCu_(3)Ti_(4)O_(12)陶瓷;同时具有良好的NTC特性,室温电阻率(ρ25)为1.5×107Ω·cm,热敏常数为6223~6874 K;线性度和迟滞分别为1.50%和1.00%。
