Three-Dimensional Ti(3)C(2)T(x) MXene-Prussian Blue Hybrid Microsupercapacitors by Water Lift-Off Lithography

[Image: see text] 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 (Ti(3)C(2)T(x)) 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 Ti(3)C(2)T(x)/CuFe-PBA hybrid microsupercapacitors are promising energy storage devices in miniaturized portable and wireless applications.