Operando leaching of pre-incorporated Al and mechanism in transition-metal hybrids on carbon substrates for enhanced charge storage

Wei Guo, Feipeng Yang, Chang Yu, Yuanyang Xie, Jiuke Chen, Yisheng Liu, Yang Zhao, Juan Yang, Xuefei Feng, Shaofeng Li, Zhao Wang, Jinhe Yu, Kunlun Liu, Kun Qian, Mesfin Tsige, Qiuyu Zhang, Jinghua Guo, Jieshan Qiu

Research output: Contribution to journalArticlepeer-review

30 Scopus citations

Abstract

Insufficient exposure and utilization of active sites often induces an inferior reactivity for transition-metal-based two-dimensional (2D) materials. In response, we for the first time propose a universal “nano-tailoring” strategy to incorporate abundant defects and active sites into low-crystallinity nanosheets by electrochemically leaching of Al species. With MnAl layered double hydroxides (LDHs) as a representative example, potassium-birnessite MnO2 (AK-MnO2) with oxygen vacancies and abundant edge sites is successfully produced. The oxygen vacancies are shown to help optimize the electron-transfer and ion-adsorption capability. These integrated advantages endow the AK-MnO2 with a high capacitance value of 239 F g−1 at 100 A g−1. By further combining with soft X-ray absorption spectroscopy techniques, we unravel that the reducibility of M2+ in M2+Al-LDH serves as the key descriptor for the reconstruction rate. This “nano-tailoring” strategy can provide some important implications and clues to manipulating 2D materials for efficient energy storage and conversion.

Original languageEnglish
Pages (from-to)2902-2918
Number of pages17
JournalMatter
Volume4
Issue number9
DOIs
StatePublished - 1 Sep 2021

Keywords

  • MAP3: Understanding
  • carbon
  • dynamic leaching
  • high-rate energy storage
  • intrinsic active species
  • structure reconstruction

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