Presentation Information
[16p-M_103-10]Electrochemical Growth Characteristics of Polypyrrole on Patterned Carbon Electrodes for Micro-Supercapacitor Research
〇(D)Gwen Brojan Castillon1, Wilfred Espulgar1, Shuto Osaki2, Eiichi Tamiya3,4, Enrique Manzano1, Maria Carla Manzano1 (1.DLSU Manila, 2.Tohoku Univ., 3.AIST-OU, 4.SANKEN-OU)
Keywords:
supercapacitor,polypyrrole,conducting polymer
The miniaturization of interdigitated electrodes (IDEs) is a key factor in improving the performance of micro-supercapacitors. However, as gap widths decrease, the risk of electrical shorting during material deposition increases. This study aims to characterize the relationship between electrode geometry and the lateral overgrowth of Polypyrrole (PPy) to better understand the fabrication constraints for carbon-based micro-devices.
The study utilized screen-printed carbon IDEs. Various geometries, including rectangular, wave-like, and triangular patterns, were tested with gap widths of 0.3 mm and 0.6 mm. PPy was deposited via Cyclic Voltammetry (CV) at 40 mV/s following an initial Linear Sweep Voltammetry (LSV) to determine the oxidation onset.
LSV analysis indicated an oxidation onset potential of approximately 500 mV. During CV growth, a clear dependency on geometry was observed. While 0.6 mm gaps remained electrically isolated throughout the experiment, the 0.3 mm gaps frequently reached a "shorting" threshold. In particular, triangular and wave-like patterns exhibited bridging within 4 cycles. These results suggest that non-uniform electric field distribution, particularly at geometric vertices, plays a significant role in accelerating lateral polymer expansion.
This study identifies critical electrochemical limits for the deposition of PPy on sub-millimeter carbon electrodes. The results suggest that for 0.3 mm gap architectures, the number of deposition cycles must be carefully controlled to prevent device failure. These findings provide a preliminary baseline for the further optimization of conducting polymer-based micro-supercapacitors.
The study utilized screen-printed carbon IDEs. Various geometries, including rectangular, wave-like, and triangular patterns, were tested with gap widths of 0.3 mm and 0.6 mm. PPy was deposited via Cyclic Voltammetry (CV) at 40 mV/s following an initial Linear Sweep Voltammetry (LSV) to determine the oxidation onset.
LSV analysis indicated an oxidation onset potential of approximately 500 mV. During CV growth, a clear dependency on geometry was observed. While 0.6 mm gaps remained electrically isolated throughout the experiment, the 0.3 mm gaps frequently reached a "shorting" threshold. In particular, triangular and wave-like patterns exhibited bridging within 4 cycles. These results suggest that non-uniform electric field distribution, particularly at geometric vertices, plays a significant role in accelerating lateral polymer expansion.
This study identifies critical electrochemical limits for the deposition of PPy on sub-millimeter carbon electrodes. The results suggest that for 0.3 mm gap architectures, the number of deposition cycles must be carefully controlled to prevent device failure. These findings provide a preliminary baseline for the further optimization of conducting polymer-based micro-supercapacitors.