Periodic Reporting for period 2 - 3D-CAP (3D micro-supercapacitors for embedded electronics)
Reporting period: 2019-10-01 to 2021-03-31
In the 3D-CAP project, we propose a 3D paradigm shift of micro-supercapacitor design to ensure increased energy storage capacities. Hydrous ruthenium dioxide (RuO2) is a pseudocapacitive material for supercapacitor electrode well-known for its high capacitance. A thin-film of ruthenium oxide will be conformally deposited by atomic layer deposition (ALD) or by electrodeposition onto a high-surface-area 3D current collector prepared via an ingenious dynamic template built with hydrogen bubbles. The structural features of these 3D architectures will be controllably tailored by the processing methodologies. These electrodes will be combined with an innovative electrolyte in solid form (a protic ionogel) able to operate over an extended cell voltage. In a parallel investigation, we will develop a fundamental understanding of electrochemical reactions occurring in pseudocapacitive RuO2 electrodes. As a key achievement, prototypes will be designed using a new concept based on a self-adaptive micro-supercapacitors matrix, which arranges itself according to the global amount of energy stored.