自支撑镍铁掺杂激光诱导石墨烯作为无粘结剂电极用于高面电容对称微型超级电容器

Laser-induced graphene (LIG) has garnered significant attention for its cost-effectiveness and high efficiency in fabricating flexible micro-energy storage devices. For the sake of enhancing the electrochemical performance of graphene electrodes, transition metal-doped graphene is a feasible strategy. Carbon cloth (CC) has good electrical conductivity, and polyethersulfone (PES) is a kind of polymer containing sulfur. In this study, Ni–Fe/CC@PES-LIG electrode materials have been prepared successfully via scribing the Ni–Fe/CC@PES films under CO 2 atmosphere by laser direct writing technology. The addition of carbon cloth not only improves the electric conductivity of as-prepared samples, but also provides a self-supporting fluid collector, and the synergistic effect with the transition metal greatly improves the electrochemical performance of the electrodes. An integrated Ni–Fe/CC@PES-LIG-10W electrode material exhibited high areal specific capacitance of 580 mF cm −2 at 1 mA cm −2 , which enhanced about 20 times approximately after carbon cloth acted as current collect. Symmetric microsupercapacitors (SMSCs) were established using two identical integrated Ni–Fe/CC@PES-LIG electrodes because they can work in both the positive and negative potential windows. The fabricated SMSCs showed a wide potential window of 1.7 V and high areal specific capacitance of 95 mF cm −2 at 1 mA cm −2 with 93% specific capacitance retention after 6000 cycles. This study provides a simple and effective strategy for the further application of the laser direct writing technology in the field of electronic products.