Defect Engineering of Oxygen‐Deficient Manganese Oxide to Achieve High‐Performing Aqueous Zinc Ion Battery
By Ting Xiong, Z. Yu, Haijun Wu, Yonghua Du, Qidong Xie, Jingsheng Chen, Yong‐Wei Zhang, S. Pennycook, Wee Siang Vincent Lee, J. Xue. Advanced Energy Materials, 2019
565 citations recorded by the source corpus.
A major limitation of MnO2 in aqueous Zn/MnO2 ion battery applications is the poor utilization of its electrochemical active surface area. Herein, it is shown that by generating oxygen vacancies (VO) in the MnO2 lattice, Gibbs free energy of Zn2+ adsorption in the vicinity of VO can be reduced to thermoneutral value (≈0.05 eV). This suggests that Zn2+ adsorption/desorption process on oxygen‐deficient MnO2 is more reversible as compared to pristine MnO2. In addition, because of the fact that fewer electrons are needed for ZnO bonding in oxygen‐deficient MnO2, more valence electrons can be contributed into the delocalized electron cloud of the material, which aids in enhancing the attainable capacity. As a result, the stable Zn/oxygen‐deficient MnO2 battery is able to deliver one of the highest capacities of 345 mAh g−1 reported for a birnessite MnO2 system. This excellent electrochemical performance suggests that generating oxygen vacancies in MnO2 may aid in the future development of advanced cathodes for aqueous Zn ion batteries.
Subfields: Electrical and Electronic Engineering, Electronic, Optical and Magnetic Materials
View Paper: https://www.semanticscholar.org/paper/4223fd419cb3efd7e18e2a260be11de264751d51
How researchers see this paper
The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.