Mg-doped layered vanadates for high-energy zinc anode-based electrochromic devices

Haoyang Dong; Mengjie Zhu; Caofeng Niu; Guolong Zhou; Tongzhuang He; Bing Xu; Jingwei Chen

doi:10.1039/d5nr01935d

Mg-doped layered vanadates for high-energy zinc anode-based electrochromic devices

Nanoscale. 2025 Jun 30. doi: 10.1039/d5nr01935d. Online ahead of print.

Authors

Haoyang Dong¹, Mengjie Zhu¹, Caofeng Niu¹, Guolong Zhou¹, Tongzhuang He¹, Bing Xu¹, Jingwei Chen^{1

2}

Affiliations

¹ School of Materials Science and Engineering, Ocean University of China, Qingdao 266100, China. bxu0117@163.com.
² Qingdao Key Laboratory of Marine Extreme Environment Materials, Qingdao 266404, China. chenjingwei@ouc.edu.cn.

PMID: 40583523
DOI: 10.1039/d5nr01935d

Abstract

Zinc anode-based electrochromic devices (ZECDs) demonstrate promising prospects in dual-functional electrochromic (EC)-energy storage systems due to their unique optical and energy retrieval properties. Vanadates are widely used in ZECDs due to their diverse color properties, but their cycling stability and kinetics are often hindered by the strong electrostatic interactions between Zn²⁺ ions and the host vanadate lattice. In this study, we fabricated magnesium ion-doped layered vanadates (MVO) with effectively enlarged interlayer spacing, promoting rapid insertion/extraction of Zn²⁺. Compared to undoped ammonium vanadate (VO), the MVO electrode exhibits superior electrochemical capacity (57.6 mAh m^-2), faster switching kinetics (t_c = 79.6 s, t_b = 25.2 s), enhanced coloration efficiency, and excellent electrochemical reversibility. Finally, the fabricated ZECDs employing MVO films demonstrate exceptional electrochemical reversibility, promising optical switching performance and excellent cycling stability (500 cycles). These results validate the effectiveness of the Mg-doping strategy for the modification of layered vanadates for optimized ZECDs coupling EC and energy storage functionalities.