All-in-One Quasi-Solid Microsupercapacitors Exhibited Piezoresistive Capability Based on Boron–Nitrogen Codoped Hollow Carbon Nanosphere Cages

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In the pursuit of advancing wearable electronics, flexible multifunctional devices that integrate both energy storage and sensing functions offer an effective route to achieve smaller, lighter, and more versatile systems. This study introduces an effective strategy for the in situ laser-induced synthesis of boron–nitrogen codoped hollow carbon nanosphere cages (BNHCNCs). In this approach, boric acid nanoparticles (H 3 BO 3 NPs) are strategically utilized as both the template and the boron doping source, while the polyimide (PI) precursor contributes to the carbon matrix and the nitrogen doping source, and the straightforward hot-water treatment effectively dissolves the H 3 BO 3 template. The resulting BNHCNC patterned electrodes precisely fabricated via laser scribing are subsequently integrated into all-in-one quasi-solid microsupercapacitors exhibited piezoresistive capability (MSCs-PC). that exhibit high specific capacitance, excellent mechanical flexibility, and impressive sensing capabilities, particularly for human motion monitoring and communication technologies. This study not only introduces a general method for synthesizing high-performance carbon nanomaterials but also provides a potential solution for advancing flexible energy storage and wearable electronics, aligned with trends in miniaturization, integration, and multifunctionality.