Heterostructured MoO3@CoWO4 nanobelts towards high electrochemical performances via oxygen vacancies generation

Ramzi Nasser; Hao Zhou; Feng Li; Habib Elhouichet; Ji-Ming Song

doi:10.1016/j.jcis.2023.10.071

Heterostructured MoO₃@CoWO₄ nanobelts towards high electrochemical performances via oxygen vacancies generation

J Colloid Interface Sci. 2024 Jan 15;654(Pt A):805-818. doi: 10.1016/j.jcis.2023.10.071. Epub 2023 Oct 16.

Authors

Ramzi Nasser¹, Hao Zhou², Feng Li³, Habib Elhouichet⁴, Ji-Ming Song⁵

Affiliations

¹ School of Materials Science and Engineering, Anhui Province Key Laboratory of Chemistry for Inorganic/Organic Hybrid Functionalized Materials, Anhui University, Hefei, Anhui 230601, PR China. Electronic address: 19901@ahu.edu.cn.
² School of Materials Science and Engineering, Anhui Province Key Laboratory of Chemistry for Inorganic/Organic Hybrid Functionalized Materials, Anhui University, Hefei, Anhui 230601, PR China.
³ AHU Green Industry Innovation Research Institute, Hefei, Anhui 230088, PR China. Electronic address: 22171@ahu.edu.cn.
⁴ Physics Department, College of Sciences, University of Bisha, P.B.551, Bisha 61922, Saudi Arabia.
⁵ School of Materials Science and Engineering, Anhui Province Key Laboratory of Chemistry for Inorganic/Organic Hybrid Functionalized Materials, Anhui University, Hefei, Anhui 230601, PR China; School of Chemistry & Chemical Engineering, Key Laboratory of Structure and Functional Regulation of Hybrid Materials, Anhui University, Ministry of Education, Hefei, Anhui 230601, PR China. Electronic address: jiming@ahu.edu.cn.

PMID: 37871530
DOI: 10.1016/j.jcis.2023.10.071

Abstract

Heterostructured nanomaterials tend to have a high proportion of oxygen vacancies (V_O) due to the presence of heterogeneous interfaces. Herein, a new kind of heterostructured MoO₃@CoWO₄ nanobelts was successfully evaluated as fascinating cathode material. SEM and TEM analysis indicated that the MoO₃ nanobelts were fully blanketed with CoWO₄ nanodots. The generation of Vo species was confirmed by XPS and EPR data. By profiting both synergistic and Vo generation effects, MoO₃@CoWO₄ electrode displayed an excellent capacitance of 246 mAh·g^-1 (1966 F·g^-1at 0.5 A·g^-1) with high-rate capability of 174 mAh·g^-1 (1394 F·g^-1 at 30 A·g^-1) as well as superb stability of 94 % (over 15,000 cycles). Notably, all-solid-state device delivered a good energy value of 63.1 Wh·kg^-1 at 375 W·kg^-1. Interestingly, the supercapacitor device showed super-low self-discharge comportment of only 12.1 % during 24 h. Importantly, the generation of the V_O defects could control the ions diffusion process and lead a sharp decrease in the self-discharge process.

Keywords: Energy storage; Heterointerface; MoO(3)@CoWO(4) core-shell; Oxygen vacancies; Supercapacitive.