Designing 3D Highly Ordered Nanoporous CuO Electrodes for High-Performance Asymmetric Supercapacitors

Abstract

The increasing demand for energy has triggered tremendous research efforts for the development of lightweight and durable energy storage devices. Herein, we report a simple, yet effective, strategy for high-performance supercapacitors by building three-dimensional pseudocapacitive CuO frameworks with highly ordered and interconnected bimodal nanopores, nanosized walls (∼4 nm) and large specific surface area of 149 m(2) g(-1). This interesting electrode structure plays a key role in providing facilitated ion transport, short ion and electron diffusion pathways and more active sites for electrochemical reactions. This electrode demonstrates excellent electrochemical performance with a specific capacitance of 431 F g(-1) (1.51 F cm(-2)) at 3.5 mA cm(-2) and retains over 70% of this capacitance when operated at an ultrafast rate of 70 mA cm(-2). When this highly ordered CuO electrode is assembled in an asymmetric cell with an activated carbon electrode, the as-fabricated device demonstrates remarkable performance with an energy density of 19.7 W h kg(-1), power density of 7 kW kg(-1), and excellent cycle life. This work presents a new platform for high-performance asymmetric supercapacitors for the next generation of portable electronics and electric vehicles.

Construction of unique cupric oxide–manganese dioxide core–shell arrays on a copper grid for high-performance supercapacitors

“…The obtained energy density is higher than that of supercapacitors reported in the literature, such as Cu 2 43 The specic capacitance of 75.6% is maintained aer 12 000 cycles (Fig. The obtained energy density is higher than that of supercapacitors reported in the literature, such as Cu 2 43 The specic capacitance of 75.6% is maintained aer 12 000 cycles (Fig.…”

Utilizing Waste Cable Wires for High‐Performance Fiber‐Based Hybrid Supercapacitors: An Effective Approach to Electronic‐Waste Management

“…When the potential is extended from 0 to 0.8 V and 0 to 1.55 V, interestingly, there is no obvious of H 2 /O 2 evolution in the CV plots and no overcharging region in the GCD plots was noticed, signifying the good electrochemical operation stability and maximum potential window of the device (1.55 V). The obtained energy density of our device is higher or comparable with those of the previously reported fiber-based solid-state SCs, such as NiCo 2 O 4 //PC (6.61 W h kg −1 ), [22] Ni 3 S 2 /Ni//pen ink (8.2 W h kg −1 ), β-Ni(OH) 2 //AC (9.8 W h kg −1 ), [23] NiCo 2 O 4 //pen ink (7.66 W h kg −1 ), [24] meshtype CuO@MnO 2 //activated graphene (29.9 W h kg −1 ), [25] and MnO 2 //graphene (27.2 W h kg −1 ), [26] respectively and some planar SCs, such as Cu 2 O/CuO/Co 3 O 4 //activated graphene (12 W h kg −1 ), [27] CuO//AC (19.7 W h kg −1 ), [28] and core-shell Ni 3 S 2 @CoS//AC (23.69 W h kg −1 ), [29] and MnFe 2 O 4 //LiMn 2 O 4 (5.5 W h kg −1 ), [30] respectively. Figure 5d shows the CV curves of the FHSC tested at various scan rates of 5-70 mV s −1 with a stable potential window of 0-1.55 V. Distinctive from the solid redox peaks observed in three-electrode system, the CV curves of the fabricated FHSC exhibited the excellent capacitive behavior due to the inclusion of EDLC material.…”

Honeycomb‐Inspired Surface‐Patterned Cu@CuO Composite Current Collector for Lithium‐Ion Batteries

“…The low‐cost and easy‐to‐use TMOs are popular candidates to make the anode materials, among which the CuO is more likely to be applied, due to its high theoretical capacity (674 mAh g −1 ), rich abundance, and nontoxicity. However, the CuO anode material suffers from poor electronic conductivity and great volume change during the charge–discharge process . Such drawbacks seriously limit its application.…”