科研之友
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摘要
Hydrovoltaic effect is an innovative route to acquire electric energy from low-quality energy of water. Carbonized wood has shown great potential in hydrovoltaic conversion for the natural directional microtube structure which can induce sustaining water flow. But the induced-current, key performance of the hydrovoltaic effect, was still limited by intrinsic resistance of carbonized wood. To reduce the intrinsic resistance and promote the carrier migration, graphitizing as a proved method is used to improve the hydrovoltaic current. In this work, the carbonized wood was graphitized in different degree through transition metal catalytic method to investigate the influence. Double influence of graphitizing modification on hydrovoltaic conversion was verified. Moderately graphitizing modification can simultaneously promote the carrier to migrate and accumulate at double electric layer (DEL) interface, which benefits hydrovoltaic effect. But excessive modification shows a negative effect on carrier accumulation and reduces the hydrovoltaic performance. Comparing to the untreated carbonized wood, the maximal open-circuit voltage of graphitized carbonized wood can reach similar to 2.4 times higher (similar to 0.47 V), while short-circuit current can be further enhanced to a notable similar to 27 times increase (similar to 35 mu A), demonstrating the remarkable enhancement of graphitizing modification on induced current.
