Scalable CNTs/NiCoSe₂ Hybrid Films for Flexible All-Solid-State Asymmetric Supercapacitors

Abstract

The rapidly developing wearable flexible electronics makes the development of high-performance flexible energy storage devices, such as all-solid-state supercapacitors (SCs), particularly important. Herein, we report the fabrication of CNTs/NiCoSe 2 hybrid films on carbon cloth (CC) through a facile co-electrodeposition method based on flexible electrodes for all-solid-state SCs. The NiCoSe 2 sheets grown on CNTs uniformly with a diameter of 50−100 nm act as the active materials. The CNTs in the hybrid films act as the scaffold to offer more deposition sites for NiCoSe 2 and provide a conductive network to facilitate the transfer of electrons. Moreover, the one-step electrodeposition process avoids the usage of any organic binders. Benefiting from the high intrinsic reactivity and unique 3D architecture, the obtained CNTs/NiCoSe 2 electrode delivers high specific capacity (218.1 mA h g −1 ) and satisfactory durability (over 5000 cycles). Remarkably, the CNTs/NiCoSe 2 //AC flexible all-solid-state (FASS) ASC provides remarkable energy density (112.2 W h kg −1 ) within 0−1.7 V and maintains 98.1% of its initial capacity after 10,000 cycles. In addition, this flexible ASC device could be fabricated at a large scale (5 × 6 cm 2 ), and the LED arrays (>3.7 V) can be easily lighted up by three ASCs in series, showing its potential practical application.

Oxygen Vacancy-Rich S-Scheme CeO2@Ni1–xCoxSe2 Hollow Spheres Derived from NiCo-MOF for Remarkable Photocatalytic CO2 Conversion

“…The XPS technique is adopted to examine the valence states of the elements in the as-synthesized samples. 41,42 The XPS survey scan of the CeO 2 @Ni 1−x Co x Se 2 HS sample confirms the existence of Ce, O, Co, Ni, and Se elements (Figure 4a), which is consistent with the EDS analysis (Figure S4). To further analyze the interfacial interaction between CeO 2 and Ni 1−x Co x Se 2 , high-resolution XPS spectra of different elements were obtained.…”

Conjugated supercapacitor with suppressed self‐discharge constructed by pairs of prelithiated Nb2O5@C with optimized elemental and phase purity in the carbon shell

“…[29] Therefore, the specific device configuration can be conceived to mitigate self-discharge based on structural configuration. In recent years, the emergence of intercalation pseudocapacitive materials has shown a series of unconventional working mechanisms, [28,[52][53][54][55][56][57] thus providing the possibility for building innovatively configured supercapacitors. And the T-Nb 2 O 5 intercalation pseudocapacitive behavior provides a theoretical basis for the conjugated supercapacitors using pairs of pre-lithiated niobium oxide to Beyond the successful realization of the conjugated supercapacitor, the strategy to optimize materials specifically for such a conjugated device is worthy of exploration.…”

The Semicoherent Interface and Vacancy Engineering for Constructing Ni(Co)Se2@Co(Ni)Se2 Heterojunction as Ultrahigh‐Rate Battery‐Type Supercapacitor Cathode

“…[8,9] Transition metal oxides, sulfides, and selenides, especially Ni/Co selenides, are identified as the wellknown battery-type cathodes for HSCs by virtue of their affluent redox reaction and large theoretical capacity. [10][11][12][13][14][15] Nevertheless, their actual tested properties (especially rate capability) are generally far inferior than that of the theoretical values, which may be ascribed to the restricted accessibility of active sites, sluggish reaction dynamics, or insufficient electron transfer capability, significantly impeding their practical applications. [16,17] So far, scientific studies have been performed to settle the intractable bottleneck, such as designing distinctive Ni/Co selenide nanostructures, [18] combining with conductive carbonaceous material or other metal compounds [19,20] or doping with heterogeneous metal species of Mn, Sn, etc.…”