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Composite Cathode based on Mn-doped Perovskite Niobate-Titanate for Efficient Steam Electrolysis
Jun Zhang1, Kui Xie*1,2, Yuan-xin Li1, Wen-tao Qi1, Cong Ruan1, Yu-cheng Wu*1,2
1.Department of Energy Materials, School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China;2.Key Laboratory of Advanced Functional Materials and Devices, Hefei University of Technology, Hefei 230009, China
Abstract:
Redox-active Mn is introduced into the B site of redox-stable perovskite niobate-titanate to improve the electrocatalytic activity of composite cathode in an oxide-ion-conducting solid oxide electrolyzer. The XRD and XPS results reveal the successful partial replacement of Ti/Nb by Mn in the B site of niobate-titanate. The ionic conductivities of the Mndoped niobate-titanate are significantly improved by approximately 1 order of magnitude in reducing atmosphere and 0.5 order of magnitude in oxidizing atmosphere compared with bare niobate-titanate at 800 oC. The current efficiency for Mn-doped niobate-titanate cathode is accordingly enhanced by ~25% and 30% in contrast to the bare cathode with and without reducing gas flowing over the cathode under the applied voltage of 2.0 V at 800 oC in an oxide-ion-conducting solid oxide electrolyzer, respectively.
Key words:  Perovskite, Ionic conductivity, High temperature steam electrolysis, Oxideion-conducting, Solid oxide electrolyzer
FundProject:
锰掺杂的钙钛矿型钛铌酸盐基复合阴极高温电解水蒸气
章俊1, 谢奎*1,2, 李远欣1, 齐文涛1, 阮聪1, 吴玉程*1,2
1.合肥工业大学材料科学与工程学院新能源系,合肥230009;2.合肥工业大学先进功能材料与器件重点实验室,合肥230009
摘要:
通过在氧化还原稳定的钙钛矿材料钛铌酸盐的B位晶格中掺杂具有氧化还原活性的锰元素提高固体氧化物电解池复合电极电催化性能.研究发现,锰元素成功取代钛铌酸盐B位的Ti/Nb.掺杂后的样 品的离子电导率在800 oC下的氧化气氛和还原气氛下的离子电导率分别提高了约1和0.5个数量级.基于掺杂后的钛铌酸盐基复合阴极,氧离子传导型固体氧化物电解池电解水蒸汽的电流效率在有和无还原气体保护下分别提高了25%和30%.
关键词:  钙钛矿,离子电导,高温水蒸气电解,氧离子传导,固体氧化物电解池
DOI:10.1063/1674-0068/27/04/457-464
分类号: