3D binderless CuMoOx ceramic bimetallic oxides based microsupercapacitors with tailorable performance manufactured by one-step direct electric discharge writing

Due to their advantageous electronic structures, vacancies, and synergistic effects, ceramic bimetallic oxides demonstrate great potential for microsupercapacitor (MSC) applications. Scalable and controllable synthesis of bimetallic oxides with exceptional capacitive performance remains a challenging task. In this work, 3D binderless CuMoOx ceramic microsupercapacitors (CuMoMSC) with tailorable shapes are produced using direct electric discharge writing (DEDW) with facile computer-aided design. The important finding is that the electrochemical performance of CuMoMSC could be directly adjusted by the DEDW machining parameter of pulse width for the first time. Moreover, it is interesting to find the composition of the machining electrode materials could be tailored by the material of cutting tool via DEDW, opening a new way for customizing the electrochemical performance of MSCs. The manufactured 3D CuMoMSC exhibits a capacitance of 46.2 mF cm−2 at 1 mV s−1, and it retained 7.3 mF cm−2 at super-high scan rate of 10 V s−1, and possessed a good cycling stability of 97.6 % (2000 cycles), which was beneficial from the synergistic effects of bimetallic oxides and the introduction of oxygen vacancies. The results of this investigation manifest the wide range of possibilities for utilizing the DEDW technique in automatically manufacturing various ceramic bimetallic oxides with customized structure for various applications, such as catalysts, MSC and batteries.