In situ synthetic C encapsulated δ-MnO2 with O vacancies: A versatile programming in bio-engineering

Wei Lv; Zilei Shen; Junlin Liu; Xudong Li; Fang Ding; Dongyue Zhang; Licheng Miao; Xuefeng Lyu; Ruijie Li; Miaomiao Wang; Yiming Li; Jingwen Meng; Chao Xu

doi:10.1016/j.scib.2024.10.034

In situ synthetic C encapsulated δ-MnO₂ with O vacancies: A versatile programming in bio-engineering

Sci Bull (Beijing). 2024 Nov 4:S2095-9273(24)00796-5. doi: 10.1016/j.scib.2024.10.034. Online ahead of print.

Authors

Wei Lv¹, Zilei Shen², Junlin Liu², Xudong Li², Fang Ding³, Dongyue Zhang², Licheng Miao⁴, Xuefeng Lyu², Ruijie Li², Miaomiao Wang², Yiming Li⁵, Jingwen Meng², Chao Xu⁶

Affiliations

¹ Institute of Energy Power Innovation, North China Electric Power University, Beijing 102206, China. Electronic address: [email protected].
² Institute of Energy Power Innovation, North China Electric Power University, Beijing 102206, China.
³ Key Laboratory of Epigenetic Regulation and Intervention, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China. Electronic address: [email protected].
⁴ Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), College of Chemistry, Nankai University, Tianjin 300071, China. Electronic address: [email protected].
⁵ Collaborative Innovation Center of Integrated Exploitation of Bayan Obo Multi-Metal Resources, Inner Mongolia University of Science and Technology, Baotou 014010, China.
⁶ Institute of Energy Power Innovation, North China Electric Power University, Beijing 102206, China. Electronic address: [email protected].

PMID: 39550274
DOI: 10.1016/j.scib.2024.10.034

Abstract

In this study, we successfully synthesized a δ-MnO₂ cathode with O vacancies, encapsulated by C derived from pyromellitic acid, using a facile hydrothermal method followed by annealing in an Ar atmosphere. The cathode's structural stability and charge transfer kinetics are enhanced by inhibiting the formation of the by-product Zn₄SO₄(OH)₆·4H₂O, regulating the Mn valence state, and suppressing the Jahn-Teller effect through the synergy of C encapsulation and O vacancies. This results in remarkable electrochemical performance, including a large capacity of 421.2 mAh g^-1 at 0.1 A g^-1, a high specific energy density of 595.53 Wh kg^-1, and exceptional long-cycle life stability with 90.88% over 4000 cycles at 10 A g^-1, together with superior coulombic efficiency (∼100%) in pure ZnSO₄ electrolyte. Moreover, the cathode materials demonstrate specific antitumor efficacy. In brief, this work introduces an in situ synthetic C encapsulated δ-MnO₂ with O vacancies expected to be applied in both large-scale energy storage and biomedicine.

Keywords: Bio-engineering; C encapsulation; O vacancies; Synergistic effect; Zn-ion batteries.