The Study on Hydrovoltaic Generator using Multi-Walled Carbon Nanotube and Graphene Oxide Layer-by-Layer Method

초록

Hydrovoltaic technology is an emerging energy harvesting approach that generates direct-current electricity from a single carbon-based device by utilizing the potential difference between wetted and non-wetted regions. In this work, we fabricated hydrovoltaic generators by layer-by-layer (LbL) assembly of multi-walled carbon nanotubes (MWCNTs) and graphene oxide (GO) on cellulose-based Korean traditional paper (Hanji), whose strong capillarity promotes efficient water transport. The alternating stacking of highly conductive MWCNTs and oxygenfunctionalized GO forms a hierarchical architecture that optimizes charge generation and transport. The device with three MWCNT/GO bilayers (MC-G#3) delivered a peak short-circuit current of 15.55 & micro;A with only 20 & micro;L of water, representing a 2.55-fold enhancement over the MWCNT-only device (MWCNT#3). The correlation between the capacitance ratio (wet vs dry) and output current further highlights the role of the electrical double layer (EDL), while multi-device connection and external-load matching experiments demonstrated a maximum load-delivered power of 0.05897 & micro;W at 47 k Omega, indicating the potential of this system as a practical miniaturized power source.

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