Oxygen-vacancy B-doped NiO/reduced graphene oxide composite nanosheets for high-performance asymmetric supercapacitor
The low conductivity and instability of NiO limit its use as an energy storage electrode material. The combination strategy of atomic doping and composite with conductive materials is an attractive way to strengthen the electrochemical properties of electrode materials. Herein, a B-doped NiO/reduced...
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Veröffentlicht in: | Journal of energy storage 2025-01, Vol.107, p.114972, Article 114972 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | The low conductivity and instability of NiO limit its use as an energy storage electrode material. The combination strategy of atomic doping and composite with conductive materials is an attractive way to strengthen the electrochemical properties of electrode materials. Herein, a B-doped NiO/reduced graphene oxide (B-(NiO/rGO)) composite nanosheet with rich oxygen vacancies was prepared through room-temperature self-assembly. The B-(NiO/rGO) composite material demonstrated an impressive specific capacitance of 888.4 F g−1 at 1 A g−1. Additionally, the assembled two-electrode asymmetric supercapacitor device is characterized by an energy density of 33.65 Wh kg−1. Even undergoing 10,000 cycles of testing, the capacitance of the composite material remained at a high level of 98.2 %, demonstrating excellent cyclic stability. The adsorption energy of OH− ions determined by theoretical calculations reveals that the adsorption energy of B-(NiO/rGO) is higher (−2.32 eV) compared to pure NiO (−1.62 eV). Here, B-atom doping enhances the oxygen vacancy concentration, while graphene enhances its conductivity. The multifaceted synergistic effects arising from B doping and the incorporation of rGO in NiO lead to significant improvements in specific capacitance. Thus, the method provides strong support for the development of supercapacitors by enhancing the performance of cathode materials.
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•B-(NiO/rGO) prepared by room-temperature self-assembly is simpler and energy efficient.•B-(NiO/rGO) electrode shows high quality specific capacitance and long cycle stability.•An asymmetric device with high energy density and long cycle stability was fabricated.•Regulating oxygen vacancy optimizes the energy storage characteristics of materials. |
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ISSN: | 2352-152X |
DOI: | 10.1016/j.est.2024.114972 |