Rapid oxygen vacancy engineering in SiC@Fe 2 O 3‐ x nanowires for high‐performance supercapacitors

Abstract Transition metal oxides (TMOs), thanks to their elevated theoretical capacitance and pseudocapacitive properties, are of particular interest in exploring the advanced supercapacitor electrode materials. The present work reports the rapid laser‐assisted synthesis of SiC@Fe 2 O 3‐ x anode materials with engineered oxygen vacancies in seconds, which improve the charge transport, redox activity, and structural stability, thus facilitating a substantial enhancement in electrochemical performance. As a result, the resultant SiC@Fe 2 O 3‐ x nanowires exhibit excellent performances with an areal capacitance of 1082.16 at 5 mA cm −2 , and retain 86.7% capacitance over 10,000 cycles. Furthermore, the assembled asymmetric supercapacitors (ASC), employing SiC@Fe 2 O 3‐ x as the negative electrode and Ni(OH) 2 as the positive electrode, delivers a 1.5 V operating voltage, an energy density of 197 μWh cm −2 , and 80.6% capacitance retention after 14,000 cycles, representing their promise toward the applications in next‐generation energy storage materials.