Efficient coupling of semiconductors into metallic MnO2@CoMn2O4 heterostructured electrode with boosted charge transfer for high-performance supercapacitors

Semiconductor heterostructures have emerged as highly promising candidates for energy storage and conversion owing to their tunable electronic and structural properties by rational design and controllable synthesis at a molecular level. The overall electrochemical performance of the semiconductor heterostructures often depends on the carrier mobility from the semiconductor interfaces and faradaic redox reactions from their active sites. Herein, we report a facile, low-cost, two-step method to controllably grow MnO2 nanorods directly on CoMn2O4 nanosheets (i.e., MnO2@CoMn2O4) with robust adhesion. An induced electric field resulted from the interface effect of heterostructures tailors the kinetic performance of electrons and ions during the charge-discharge process, enhancing the electron mobility and reducing diffusion barrier for charge carriers (OH−) ions migration. As a result, the rational design and controllable heterostructures exhibit significantly improved electrochemical capacitive performance, including remarkable specific capacitance, excellent rate capability, and cycling stability. Furthermore, exploring MnO2@CoMn2O4 as positive electrode and N-doping 3D reduction of graphene oxide (N-3DrGO) as negative electrode yields an asymmetric supercapacitor with high energy density (230.57 mWh cm−2), remarkable power density (3.91 mW cm−2 at 149.99 mWh cm−2), and excellent cycling stability (81.3% capacitance retention after 5000 cycles at 3 mA cm−2). This work offers new opportunities to explore high-performance electrode materials by providing methods to control the interface in nano-heterostructures.

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Work Title Efficient coupling of semiconductors into metallic MnO2@CoMn2O4 heterostructured electrode with boosted charge transfer for high-performance supercapacitors
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Open Access
Creators
  1. Cheng Zhang
  2. Zhixiang Peng
  3. Yu Chen
  4. Huamin Chen
  5. Bingwen Zhang
  6. Huanyu Cheng
  7. Jun Wang
  8. Mingsen Deng
Keyword
  1. Metallic MnO2@CoMn2O4 heterostructure
  2. Interfacial interaction
  3. An induced electric field
  4. DFT calculation
  5. Low ion-diffusion resistance
License CC BY-NC-ND 4.0 (Attribution-NonCommercial-NoDerivatives)
Work Type Article
Publisher
  1. Electrochimica Acta
Publication Date July 1, 2020
Publisher Identifier (DOI)
  1. https://doi.org/10.1016/j.electacta.2020.136246
Deposited February 17, 2023

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Version 1
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  • Created
  • Added EA20-00913R2.pdf
  • Added Creator Cheng Zhang
  • Added Creator Zhixiang Peng
  • Added Creator Yu Chen
  • Added Creator Huamin Chen
  • Added Creator Bingwen Zhang
  • Added Creator Huanyu Cheng
  • Added Creator Jun Wang
  • Added Creator Mingsen Deng
  • Published
  • Updated Work Title, Keyword Show Changes
    Work Title
    • Efficient coupling of semiconductors into metallic MnO<sub>2</sub>@CoMn<sub>2</sub>O<sub>4</sub> heterostructured electrode with boosted charge transfer for high-performance supercapacitors
    • Efficient coupling of semiconductors into metallic MnO2@CoMn2O4 heterostructured electrode with boosted charge transfer for high-performance supercapacitors
    Keyword
    • Metallic MnO2@CoMn2O4 heterostructure, Interfacial interaction, An induced electric field, DFT calculation, Low ion-diffusion resistance
  • Deleted EA20-00913R2.pdf
  • Added Manuscrip.docx
  • Updated