Abstract
The construction of electrochemical energy-storage devices by scalable thin-film microfabrication methods with high energy and power density is urgently needed for many emerging applications. Herein, we demonstrate an in-plane hybrid microsupercapacitor with a high areal energy density by employing a battery-type CuFe-Prussian blue analogue (CuFe-PBA) as the positive electrode and pseudocapacitive titanium carbide MXene (Ti3C2Tx) as the negative electrode. A three-dimensional lignin-derived laser-induced graphene electrode was prepared as the substrate by laser exposure combined with an environmentally friendly water lift-off lithography. The designed hybrid device achieved enhanced electrochemical performance thanks to the ideal match of the two types of high-rate performance materials in proton-based electrolytes and the numerous electrochemically active sites. In particular, the device delivers a high areal capacitance of 198 mF cm–2, a wide potential window (1.6 V), an ultrahigh rate performance (75.8 mF cm–2 retained even at a practical/high current density of 100 mA cm–2), and a competitive energy density of 70.5 and 27.6 μWh cm–2 at the power densities 0.74 and 52 mW cm–2, respectively. These results show that the Ti3C2Tx/CuFe-PBA hybrid microsupercapacitors are promising energy storage devices in miniaturized portable and wireless applications.
Highlights
The construction of electrochemical energy-storage devices by scalable thin-film microfabrication methods with high energy and power density is urgently needed for many emerging applications
Among various Prussian blue analog (PBA) materials, the Cu[Fe(CN)6]0.63δ0.37·3.4H2O (CuFe-PBA), wherein δ means the ferricyanide vacancy, displays outstanding electrochemical performance, such as superior proton conduction, ultrahigh rate performance, and extremely long cycle life.[25]. These key features make the CuFe-PBA closely matched for use as a high-rate battery material with Ti3C2Tx to assemble hybrid microsupercapacitors (H-MSCs)
The fabrication process of the Ti3C2Tx/Laser-induced graphene (LIG) electrode is presented in Figure 1a using a simple mask-free spray coating method
Summary
The construction of electrochemical energy-storage devices by scalable thin-film microfabrication methods with high energy and power density is urgently needed for many emerging applications. The Ti3C2Tx/LIG electrode with high mass loading shows a good rate performance even at a high current density, due to the good ohmic contact between Ti3C2Tx nanoflakes and LIG electrode as well as the 3D interconnected nature of the electrode (Figure S6a−c) that facilitates the diffusion of the protons.
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