Redox potential regulation toward suppressing hydrogen evolution in aqueous sodium-ion batteries: Na1.5Ti1.5Fe0.5(PO4)3

被引：17

作者：

Qiu, Yuegang ^{[1
]}

Yu, Yonghui ^{[1
]}

Xu, Jia ^{[1
]}

Liu, Yi ^{[1
]}

Ou, Mingyang ^{[1
]}

Sun, Shixiong ^{[1
]}

Wei, Peng ^{[1
]}

Deng, Zhi ^{[1
]}

Xu, Yue ^{[1
]}

Fang, Chun ^{[1
]}

Li, Qing ^{[1
]}

Han, Jiantao ^{[1
]}

Huang, Yunhui ^{[1
]}

机构：

[1] Huazhong Univ Sci & Technol, Sch Mat Sci & Engn, State Key Lab Mat Proc & Die & Mould Technol, Wuhan 430074, Hubei, Peoples R China

来源：

JOURNAL OF MATERIALS CHEMISTRY A | 2019年 / 7卷 / 43期

基金：

中国国家自然科学基金; 国家重点研发计划;

关键词：

ENERGY-STORAGE; ELECTROCHEMICAL PERFORMANCE; NATI2(PO4)(3); LITHIUM; ELECTROLYTE; CARBON; CATHODE; ANODE; HEXACYANOFERRATE; CONDUCTIVITY;

D O I：

10.1039/c9ta08829f

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Aqueous sodium-ion batteries (ASIBs) show superior characteristics with high safety and low cost for large scale energy storage systems. However, easily occurring hydrogen evolution at a negative potential is a huge barrier to the application of anode materials in ASIBs. Even the most promising insert-type anode material, NaTi2(PO4)(3) (NTP), cannot be commercialized due to its inadequate operating potential (-0.807 V vs. Ag/AgCl) that is close to the hydrogen evolution potential (-0.817 V vs. Ag/AgCl). Here, we report a redox potential regulation strategy to overcome this technical problem by integrating the redox couples of Ti4+/Ti3+ and Fe3+/Fe2+ to yield Na1.5Ti1.5Fe0.5(PO4)(3) (NTFP) and increasing its operating potential up to -0.721 V vs. Ag/AgCl, which effectively prevents the potential overlap with the reductive decomposition of H2O. Importantly, the excellent electrochemical properties and low energy consuming synthetic route to NTFP open a new perspective to energetically develop low cost and highly stable ASIBs as a large-scale energy storage tool.

引用

页码：24953 / 24963

页数：11

共 56 条

[1] Progress in Aqueous Rechargeable Sodium-Ion Batteries [J].