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Closed-loop photo- and electrocatalysis using floatable hierarchical hydrogel device for efficient waste-derived fuel production

Device, ISSN: 2666-9986, Vol: 2, Issue: 12, Page: 100515
2024
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Article Description

Continuous and sustainable fuel production is essential for transitioning to a green-energy society. Solar-fuel production via photocatalysis is renewable but limited by vulnerability to weather dependence and suboptimal efficiency, necessitating an innovative solution. We present a feedback-controlled closed-loop system integrating photo- and electrocatalysis within a compact, floatable device. This system compensates for solar-fuel production shortfalls with electrochemical methods, optimizing catalyst pairings for high activity, selectivity, and durability. The unique floatability maximizes solar-to-fuel conversion efficiency with gas-liquid interface-operating photocatalysts and fully utilized submerged electrocatalysts. This dual-mode elastomer-hydrogel device achieves a plastic-waste-reforming activity of 269 mmol-H 2 /h⋅m 2 using concentrated sunlight and also demonstrates nearly 100% Faradaic efficiency and selectivity in formate production. Scaling up to 1 m 2 yields 23.7 mmol/h and 3.05 L/day hydrogen from polyethylene terephthalate (PET) bottles under natural sunlight, maintaining stable production over a month. This closed-loop system shows a promise for steady and economically viable fuel production.

Bibliographic Details

Wang Hee Lee; Seongbeom Lee; Hyunseo Park; Haeseong Kim; Jae Hwan Jeong; Chan Woo Lee; Junhyeok Heo; Young-Hoon Lee; Yoojin Shin; Kyung Hyun Ahn; Megalamane S. Bootharaju; Byoung-Hoon Lee; Jaeyune Ryu; Taeghwan Hyeon; Yung-Eun Sung; Dae-Hyeong Kim

Elsevier BV

Engineering; Physics and Astronomy

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