Hierarchical MIL-88A/NiCo2O4@N-CNT Hybrid for Asymmetric Supercapacitors and Hydrogen Evolution Reaction
4 affiliations
- 1Department of Physics, Qilu Institute of Technology, Jinan 250200, China
- 2Department of Toxicology and Bromatology, L. Rydygier Collegium Medicum in Bydgoszcz, Nicolaus Copernicus University in Torun, 2 Jurasza Str., 85-089 Bydgoszcz, Poland
- 3Department of Organic and Physical Chemistry, Medical University of Warsaw, 1 Banacha Str., 02-097 Warsaw, Poland
- 4Department of Physics, College of Sciences, Princess Nourah bint Abdulrahman University, P.O. Box 84428, Riyadh 11671, Saudi Arabia
Abstract
The development of multifunctional hybrid electrode materials with high-performance energy storage and electrocatalytic activity is highly desirable for advanced energy technologies. Herein, a MIL-88A/NiCo2O4@N-CNT ternary composite was prepared through ultrasonic-assisted assembly of porous MIL-88A, redox-active NiCo2O4, and conductive nitrogen-doped carbon nanotubes (N-CNTs). The synergistic interaction among these components provides abundant active sites, improved electrolyte accessibility, and enhanced charge transfer pathways. An increase in the BET surface area was observed in the case of hybrid composite (176.43 m2 g−1), compared to MIL-88A (99.35 m2 g−1) and NiCo2O4 (145.52 m2 g−1). The electrode based on MIL-88A/NiCo2O4@N-CNT was obtained with a specific capacity of 2036 C g−1 at 10 mV s−1 and 2209 C g−1 at 2.0 A g−1 in a three-electrode cell system. The specific capacity for asymmetric supercapacitors with the MIL-88A/NiCo2O4@N-CNT//AC structure was found to be 412 C g−1 from cyclic voltammetry (CV) and 432 C g−1 from galvanostatic charge–discharge (GCD), and the energy density was 98.6 Wh kg−1, and the power density was 1727 W kg−1. The electrochemical stability was also confirmed, as after 10,000 charge–discharge cycles, the hybrid supercapacitor still maintained 87.66% capacity with a coulombic efficiency of 93.60%. Moreover, the fabricated material proved to be a suitable catalyst for the hydrogen evolution reaction (HER) process, showing low overpotential (98 mV at 10 mA cm−2), a Tafel slope of 46.20 mV dec−1, and current retention of 95.3% after 20 h. This synergistic effect between the porous framework of MOF, multivalent active NiCo2O4 centers, and conducting N-CNT structure provides the above improved properties, which are effective in providing electrons.
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BibTeX
@article{saddique2026hierarchical,
title = {{Hierarchical MIL-88A/NiCo2O4@N-CNT Hybrid for Asymmetric Supercapacitors and Hydrogen Evolution Reaction}},
author = {Jaffer Saddique and Muhammad Ahsan and Zhao Huihui and Marcin Gackowski and Łukasz Szeleszczuk and Amjad A. Almunyif},
journal = {Molecules},
year = {2026},
month = oct,
doi = {10.3390/molecules31213829},
url = {https://www.mdpi.com/1420-3049/31/21/3829},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - Hierarchical MIL-88A/NiCo2O4@N-CNT Hybrid for Asymmetric Supercapacitors and Hydrogen Evolution Reaction
AU - Jaffer Saddique
AU - Muhammad Ahsan
AU - Zhao Huihui
AU - Marcin Gackowski
AU - Łukasz Szeleszczuk
AU - Amjad A. Almunyif
PY - 2026
DA - 2026/10/23
JO - Molecules
DO - 10.3390/molecules31213829
UR - https://www.mdpi.com/1420-3049/31/21/3829
AB - The development of multifunctional hybrid electrode materials with high-performance energy storage and electrocatalytic activity is highly desirable for advanced energy technologies. Herein, a MIL-88A/NiCo2O4@N-CNT ternary composite was prepared through ultrasonic-assisted assembly of porous MIL-88A, redox-active NiCo2O4, and conductive nitrogen-doped carbon nanotubes (N-CNTs). The synergistic interaction among these components provides abundant active sites, improved electrolyte accessibility, and enhanced charge transfer pathways. An increase in the BET surface area was observed in the case of hybrid composite (176.43 m2 g−1), compared to MIL-88A (99.35 m2 g−1) and NiCo2O4 (145.52 m2 g−1). The electrode based on MIL-88A/NiCo2O4@N-CNT was obtained with a specific capacity of 2036 C g−1 at 10 mV s−1 and 2209 C g−1 at 2.0 A g−1 in a three-electrode cell system. The specific capacity for asymmetric supercapacitors with the MIL-88A/NiCo2O4@N-CNT//AC structure was found to be 412 C g−1 from cyclic voltammetry (CV) and 432 C g−1 from galvanostatic charge–discharge (GCD), and the energy density was 98.6 Wh kg−1, and the power density was 1727 W kg−1. The electrochemical stability was also confirmed, as after 10,000 charge–discharge cycles, the hybrid supercapacitor still maintained 87.66% capacity with a coulombic efficiency of 93.60%. Moreover, the fabricated material proved to be a suitable catalyst for the hydrogen evolution reaction (HER) process, showing low overpotential (98 mV at 10 mA cm−2), a Tafel slope of 46.20 mV dec−1, and current retention of 95.3% after 20 h. This synergistic effect between the porous framework of MOF, multivalent active NiCo2O4 centers, and conducting N-CNT structure provides the above improved properties, which are effective in providing electrons.
SN - 1420-3049
ER -