{"title":"Activating Ga0.8Ti0.4Nb0.8O4 cathode for direct electrolysis of CO2 via electrochemical switching and infiltration of co-catalyst","authors":"Xiaojing Liu , Jiupai Ni , Chengsheng Ni","doi":"10.1016/j.jpowsour.2024.235022","DOIUrl":null,"url":null,"abstract":"<div><p>Solid oxide electrolysis cell (SOEC) can efficiently convert CO<sub>2</sub> into CO using renewable energy sources. SOECs that operate at around 800 °C and negative bias for CO<sub>2</sub> reduction pose demanding requirements on the stability of the cathode. Here, a non-perovskite niobate, Ga<sub>0.8</sub>Ti<sub>0.4</sub>Nb<sub>0.8</sub>O<sub>4</sub> (GTN), is developed as a robust cathode that can be activated under a −1.4 V bias at 800 °C for CO<sub>2</sub> splitting. A gradual increase in the current density of the electrolysis cell with GTN cathode is accompanied by the partial reduction of Nb<sup>5+</sup> to Nb<sup>4+</sup> to produce NbO<sub>2</sub> and a pseudorutile phase. The coupling of NbO<sub>2</sub> nanoparticles and the defective pseudorutile surface layer serves as a good combination for the electrochemical reduction of CO<sub>2</sub> at elevated temperatures: the electrolysis performance is slightly enhanced by ionic infiltration of Ni because the <em>in situ</em> grown metallic NbO<sub>2</sub> can serve as the electron reservoir, similar to the metal Ni. The presence of CeO<sub>2</sub> can increase the activation of CO<sub>2</sub> and provide the ionic transport between the interface of the electrolyte and cathode. This work demonstrates a robust niobate that can be reduced by electrochemical switching to reduce the stubborn Nb<sup>5+</sup> to produce a composite functional layer for efficient CO<sub>2</sub> splitting.</p></div>","PeriodicalId":377,"journal":{"name":"Journal of Power Sources","volume":null,"pages":null},"PeriodicalIF":8.1000,"publicationDate":"2024-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Power Sources","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0378775324009741","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
引用次数: 0
Abstract
Solid oxide electrolysis cell (SOEC) can efficiently convert CO2 into CO using renewable energy sources. SOECs that operate at around 800 °C and negative bias for CO2 reduction pose demanding requirements on the stability of the cathode. Here, a non-perovskite niobate, Ga0.8Ti0.4Nb0.8O4 (GTN), is developed as a robust cathode that can be activated under a −1.4 V bias at 800 °C for CO2 splitting. A gradual increase in the current density of the electrolysis cell with GTN cathode is accompanied by the partial reduction of Nb5+ to Nb4+ to produce NbO2 and a pseudorutile phase. The coupling of NbO2 nanoparticles and the defective pseudorutile surface layer serves as a good combination for the electrochemical reduction of CO2 at elevated temperatures: the electrolysis performance is slightly enhanced by ionic infiltration of Ni because the in situ grown metallic NbO2 can serve as the electron reservoir, similar to the metal Ni. The presence of CeO2 can increase the activation of CO2 and provide the ionic transport between the interface of the electrolyte and cathode. This work demonstrates a robust niobate that can be reduced by electrochemical switching to reduce the stubborn Nb5+ to produce a composite functional layer for efficient CO2 splitting.
期刊介绍:
The Journal of Power Sources is a publication catering to researchers and technologists interested in various aspects of the science, technology, and applications of electrochemical power sources. It covers original research and reviews on primary and secondary batteries, fuel cells, supercapacitors, and photo-electrochemical cells.
Topics considered include the research, development and applications of nanomaterials and novel componentry for these devices. Examples of applications of these electrochemical power sources include:
• Portable electronics
• Electric and Hybrid Electric Vehicles
• Uninterruptible Power Supply (UPS) systems
• Storage of renewable energy
• Satellites and deep space probes
• Boats and ships, drones and aircrafts
• Wearable energy storage systems