인산 첨가를 통한 산화 그래핀 기반 하이드로볼타익 발전기의 성능 향상 연구

초록

This study proposes a high-performance hydrovoltaic generator utilizing the synergy between graphene oxide (GO) and phosphoric acid (). While GO provides excellent hydrophilicity and ion flow pathways through its abundant oxygen functional groups, its output is limited by low proton conductivity and restricted moisture uptake when used alone. To overcome these challenges, phosphoric acid offering superior hygroscopicity and proton donating capability was incorporated into the GO matrix. A GO/A composite was fabricated on Hanji (traditional Korean paper) via a dip-coating, with the phosphoric acid concentration (0.1, 0.25 and 0.5 mL) optimized for maximum power output. Raman spectroscopy revealed that the ratio increased from 0.670 for pristine GO to a peak of 0.752 for GO/A (0.25), confirming effective defect formation that facilitates ion transport. The optimized GO/A (0.25) device achieved an enhancing the output voltage (0.67 V), a short-circuit current (7.19 ), and a maximum power output of 4.84 approximately 1.6-, 4.5-, and 7.5-fold enhancements over pristine GO, respectively. A four-unit series connection further produced 2.4 V, demonstrating practical scalability. These results identify the hygroscopicity and proton conductivity of phosphoric acid as the primary mechanisms enhancing GO based moisture energy harvesting, with potential applications in self-powered IoT and wearable systems.

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