Yaxue Luan,Guangdi Nie,Xinwei Zhao,Nan Qiao,Xiaochen Liu,Hao Wang,Xinni Zhang,Youqiang Chen,Yun-Ze Long
With the rapid development of lightweight, portable, and even wearable electronics, there is an increasing demand for flexible supercapacitors with excellent electrochemical performance. Here, we present the design and preparation of a novel architecture with SnO 2 dots uniformly confined on the activated porous carbon nanofibers (CNFs) using copper and its oxides as the hard templates for generating holes. Not only does the single electrode itself with a certain loading mass of SnO 2 show larger specific capacitance, better rate capability, and higher conductivity than the bare CNFs and activated CNFs/SnO 2 electrodes, but the assembled quasi-solid-state symmetric supercapacitor also exhibits good flexibility as well as superior electrochemical property with satisfactory energy density and favorable cycling stability, which indicates the great potential for practical applications. This work may provide a versatile and low-cost strategy to construct carbon/metal oxide nanostructures with robust binding force at the interface for adhesive-free supercapacitors.
The widespread adoption of sodium-ion batteries (SIBs) remains constrained by the inherent limitations of conventional anode materials, particularly their inadequate electronic conductivity, limited active sites, and pronounced structural degradation during cycling. To overcome these limitations, we propose a novel redox engineering approach to fabricate oxygen-vacancy-rich SnO2dots anchored on reduced graphene oxide (rGO), which are encapsulated within N-doped carbon nanofibers (denoted as ov-SnO2/rGO@N-CNFs) through electrospinning and subsequent carbonization. The introduction of rich oxygen vacancies establishes additional sodium intercalation sites and enhances Na+diffusion kinetics, while the conductive N-doped carbon network effectively facilitates charge transport and mitigates SnO2aggregation. Benefiting from the well-designed architecture, the hierarchical ov-SnO2/rGO@N-CNFs electrode achieves remarkable reversible specific capacities of 351 mAh g−1after 100 cycles at 0.1 A g−1and 257.3 mAh g−1after 2000 cycles at 1.0 A g−1and maintains 177 mAh g−1even after 8000 cycles at 5.0 A g−1, demonstrating exceptional long-term cycling stability and rate capability. This work offers a versatile design strategy for developing high-performance anode materials through synergistic interface engineering for SIBs.
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