{"title":"Enhanced ionic conductivity through B-site Zr doping in NaNbO3 solid electrolytes","authors":"Deepanshu Kaneria , Deepak Yadav , Udeshwari Jamwal , Shivam Kumar Mittal , Kanhaiya Lal Yadav","doi":"10.1016/j.jpowsour.2024.234948","DOIUrl":null,"url":null,"abstract":"<div><p>Oxide ion conductors hold significance in various applications, such as electrolytes in solid oxide fuel cells. This study focuses on synthesizing and systematically investigating the structural, morphological, and electrical properties of NaNb<sub>1-x</sub>Zr<sub>x</sub>O<sub>3-0.5x</sub> (0 <span><math><mrow><mo>≤</mo></mrow></math></span> x <span><math><mrow><mo>≤</mo></mrow></math></span> 0.15) solid electrolyte. X-ray photoelectron spectroscopy (XPS) analysis shows that introducing a small quantity of zirconium into NaNbO<sub>3</sub> induces an environment of unbalanced charge neutrality, creating oxygen vacancies. This phenomenon establishes a pathway for the mobility of oxygen ions. Temperature-dependent ac conductivity, analyzed through impedance data, follows Jonscher's power law, with the 's' parameter indicating a correlated barrier hopping mechanism. Enhanced conductivity is observed with Nb<sup>5+</sup> substitution by Zr<sup>4+</sup>. The reduced activation energy value is observed for x = 0.1, which suggests enhanced ion hopping and, hence, enhanced conductivity. NaNb<sub>0.9</sub>Zr<sub>0.1</sub>O<sub>2.95</sub> exhibits predominantly ionic conduction with a total conductivity of 6.2 × 10<sup>−4</sup> S cm<sup>−1</sup> and bulk conductivity of 1.72 × 10<sup>−3</sup> S cm<sup>−1</sup> at 700 °C. This study shows the promising potential of Zr-doped NaNbO<sub>3</sub> as a solid electrolyte for various electrochemical applications.</p></div>","PeriodicalId":377,"journal":{"name":"Journal of Power Sources","volume":null,"pages":null},"PeriodicalIF":8.1000,"publicationDate":"2024-06-24","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/S0378775324009005","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
Oxide ion conductors hold significance in various applications, such as electrolytes in solid oxide fuel cells. This study focuses on synthesizing and systematically investigating the structural, morphological, and electrical properties of NaNb1-xZrxO3-0.5x (0 x 0.15) solid electrolyte. X-ray photoelectron spectroscopy (XPS) analysis shows that introducing a small quantity of zirconium into NaNbO3 induces an environment of unbalanced charge neutrality, creating oxygen vacancies. This phenomenon establishes a pathway for the mobility of oxygen ions. Temperature-dependent ac conductivity, analyzed through impedance data, follows Jonscher's power law, with the 's' parameter indicating a correlated barrier hopping mechanism. Enhanced conductivity is observed with Nb5+ substitution by Zr4+. The reduced activation energy value is observed for x = 0.1, which suggests enhanced ion hopping and, hence, enhanced conductivity. NaNb0.9Zr0.1O2.95 exhibits predominantly ionic conduction with a total conductivity of 6.2 × 10−4 S cm−1 and bulk conductivity of 1.72 × 10−3 S cm−1 at 700 °C. This study shows the promising potential of Zr-doped NaNbO3 as a solid electrolyte for various electrochemical applications.
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