Enhanced supercapacitive performance of polyacrylonitrile derived hierarchical porous carbon via hybridizing with MoS2 nanosheets

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Integrating polyaniline (PANI) with two-dimensional (2D) nanostructures is a promising strategy to improve electrochemical performance. In this work, 2D laminar van der Waals heterostructures of graphene and WS 2 nanosheets were prepared for the enhancement of the supercapacitive performance of PANI. With well-dispersed graphene/WS 2 nanosheet hybrids (G-LS/WS 2 -LS) as deposition supports, the in situ polymerization of aniline delivered a ternary nanocomposite PANI/G-LS/WS 2 -LS. Benefiting from the good electrical conductivity and chemical stability of graphene, as well as the high redox activity of WS 2 , the ternary nanocomposite (PANI/G-LS/WS 2 -LS) exhibited significantly enhanced electrochemical performance as compared with PANI. Typically, a high specific capacitance of 421.5 F/g was delivered at a current density of 1 A/g in a three-electrode system, which is more than 1.5 times that of PANI (274.1 F/g at 1 A/g). Additionally, the symmetric supercapacitor based on PANI/G-LS/WS 2 -LS showed good electrochemical stability with a 71.6% capacitance retention after 10,000 cycles at 5 A/g and a high specific energy of 9.96 W h/kg at a specific power of 250.04 W/kg. The study provides a facile approach to boost the electrochemical performance of conductive polymers for efficient and reliable energy storage.

Section: Methodsmentioning

confidence: 99%

Heterolayered 2D Nanohybrids of Graphene-WS₂ Nanosheets: Enabling Enhanced Supercapacitive Performance of Polyaniline

Tao

et al. 2023

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“…Additionally, the capacitive contribution can be calculated by I = k 1 v + k 2 v 1 / 2 where the k 1 and k 2 can be determined by the slope and intercept of the curves shown in Figure b, and k 1 v and k 2 v 1/2 represent the contributions of surface-controlled capacitance and diffusion-controlled capacitance, respectively. As shown in the Figure c,d, the contributions of surface-controlled capacitances are as high as 46.2, 49.2, 51.6, 55.8, and 72.7% at scan rates of 10, 20, 30, 50, and 100 mV s −1 , respectively, reflecting the excellent surface charge storage capability and high rate capability of ST@ZIF-67/MnO 2 …”

Section: Resultsmentioning

confidence: 83%

“…The electrochemical activity was estimated by cyclic voltammetry (CV), galvanostatic charge–discharge (GCD), and electrochemical impedance spectroscopy (EIS). According to the GCD curves, specific capacitances ( C s , F g –1 ) of the electrode materials were calculated by the following equation C s = I Δ t m Δ V where I , Δ t , m , and Δ V are the discharge current (A), discharge time (s), mass of active material in the working electrode (g), and potential window (V), respectively.…”

Section: Methodsmentioning

confidence: 99%

Growth of Flower-like MnO₂ on Porous ZIF-67 for Achieving Enhanced Supercapacitive Properties

Tao

Zhou

et al. 2022

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Zeolitic imidazolate framework (ZIF)-supported flower-like porous MnO 2 (ST@ZIF-67/MnO 2 ) was fabricated through SiO 2 -guided preparation of the ZIF precursor and subsequent in situ synthesis and deposition of MnO 2 . The specific porous structure can effectively shorten the ion transport channels, expose more active sites, and improve the tolerance toward volume expansion during the cyclic process, thus resulting in enhanced supercapacitive properties. Typically, the ST@ZIF-67/MnO 2 -based electrode delivered a high specific capacitance of 278.6 F g −1 at 0.5 A g −1 , which is almost 10 times that of pristine ZIF-67 and 1.5 times that of the composite without using the SiO 2 template (ZIF-67/MnO 2 ). Additionally, the electrode showed good electrochemical cycling stability with 80.3% retention after 10, 000 cycles at 10 A g −1 . Our strategy of growing porous transition metal oxides on ZIFs provides a viable pathway for developing efficient electrode materials for energy storage devices.

“…According to the isotherm, the pore size distribution of the sample was calculated. As revealed by Figure b, the pore size is mainly distributed in the range 3–100 nm, suggesting a hierarchical porous structure of Fe 2 O 3 @HA-Fe-BPDC and the coexistence of mesopores and macropores, which are beneficial to the penetration of electrolyte and the transport of ions. − Additionally, the numerous pores are also good for the construction of interlocked structures (Figure c) and thus enhance the tolerance toward the volume expansion/contraction during the lithiation/delithiation process. The specific surface area and average pore width are determined to be 46.1 m 2 g –1 and 21.8 nm through BET and BJH methods, respectively.…”

Section: Resultsmentioning

confidence: 98%

Facile Preparation of Interlocked Fe₂O₃/MOF Composite for Boosted Rate and Cycle Performance of Lithium-Ion Batteries

Su¹,

Hua

Yang³

et al. 2023

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Iron oxide (Fe 2 O 3 ) is emerging as a potential anode alternative for lithium-ion batteries (LIBs) due to the merits of high specific capacity, environmental friendliness, and costeffectiveness. However, trapped by unsatisfactory cycling stability and rate capability, further modification is needed for Fe 2 O 3 to achieve practical requirements. In this study, a Fe 2 O 3 -based composite anode (namely Fe 2 O 3 @HA-Fe-BPDC) with interlocked structure was designed and synthesized for pursuing enhanced electrochemical properties. Benefiting from the porous structure, abundant active sites, and good tolerance to volume expansion, the as-prepared electrode exhibits significantly boosted rate capability, excellent specific capacity, and satisfactory reversibility. Typically, the Fe 2 O 3 @HA-Fe-BPDC anode provided an excellent specific capacity of 708 mAh g −1 at 0.1 A g −1 and remained at a high level of 332 mAh g −1 at 1 A g −1 , delivering significantly improved rate performance than Fe 2 O 3 . Additionally, outstanding capacity retention (95.4%) was achieved at 1 A g −1 after 600 charge/discharge cycles. The strategy based on the facile coprecipitation for fabricating Fe 2 O 3 and MOF composite electrodes provides a feasible technique to develop a high-performance anode for LIBs.