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α-PbO2-type niobate as efficient cathode materials for steam and CO2 electrolysis
Journal of Power Sources ( IF 9.2 ) Pub Date : 2020-11-18 , DOI: 10.1016/j.jpowsour.2020.229234
Wenji Ruan , Xiangling Yue , Jiupai Ni , Deti Xie , Chengsheng Ni

α-PbO2-type Mn0.5Ti0.5NbO4-based oxides are studied as cathode materials in solid oxide electrolysis cell (SOEC) for the direct electrolysis of steam or CO2 at 800 °C. Comparison between Mn0.5Ti0.5NbO4 and the Fe-doped ones, Fe0.3Mn0.35Ti0.35NbO4 and Fe0.6Mn0.2Ti0.2NbO4, indicates that the Fe3+ doping increases the electric conductivity in air but decreases the stability of the α-PbO2 structure in reducing atmosphere as in Fe0.6Mn0.2Ti0.2NbO4. The electric conductivity in reducing atmosphere is found to be ascribed to Ti4+-O-Ti3+ and Fe3+-O-Fe2+ in Mn0.5Ti0.5NbO4 and Fe doped ones, respectively. The steam or CO2 electrolsysis indicates that 30% Fe3+ substitution for Mn/Ti decreases the polarization resistance at low bias, but 60% Fe doping increases the polarization resistance dramatically than Mn0.5Ti0.5NbO4. The excessive Fe3+ doping is found to induce the phase transformation and delamination on the cathode/electrolyte interface under a cathodic current. The electrolyser with Fe0.3Mn0.35Ti0.35NbO4 cathode on zirconia-based electrolyte imparts a stable current density of 2.32 Acm−2 at −1.6 V if Ar-88% H2O is used as feeding gas. Analysis of the gas product indicates that H2 is produced and the Faradaic efficiency at −1.4 V and −1.6 V is found to be 100% and 93%, respectively.



中文翻译:

α-PBO 2型铌酸作为有效的正极材料的蒸汽和CO 2的电解

α-PBO 2型的Mn 0.5的Ti 0.5的NbO 4系氧化物被研究作为阴极材料用于蒸汽或CO的直接电解固体氧化物电解池(SOEC)2在800℃下。Mn 0.5 Ti 0.5 NbO 4与Fe掺杂的Fe 0.3 Mn 0.35 Ti 0.35 NbO 4和Fe 0.6 Mn 0.2 Ti 0.2 NbO 4的比较表明,Fe 3+掺杂增加了空气中的电导率,但降低了稳定性-PbO 2的Fe 0.6 Mn 0.2 Ti 0.2 NbO 4中的还原气氛下的组织。发现在还原气氛中的电导率分别归因于Mn 0.5 Ti 0.5 NbO 4和Fe掺杂的Ti 4+ -O-Ti 3+和Fe 3+ -O-Fe 2+。蒸汽或CO 2电解表明,在低偏压下用30%的Fe 3+代替Mn / Ti降低了极化电阻,但60%的Fe掺杂比Mn 0.5 Ti 0.5 NbO 4大大增加了极化电阻。。发现过量的Fe 3+掺杂在阴极电流下在阴极/电解质界面上引起相变和分层。如果使用Ar-88%H 2 O作为进料气体,则在氧化锆基电解质上具有Fe 0.3 Mn 0.35 Ti 0.35 NbO 4阴极的电解槽在-1.6 V时可提供2.32 Acm -2的稳定电流密度。气体产物的分析表明产生了H 2,并且在-1.4 V和-1.6 V时的法拉第效率分别为100%和93%。

更新日期:2020-11-19
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