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. 2015 Nov 16;5:16537. doi: 10.1038/srep16537

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(a) The schematic of human locomotion: red circles indicate the heel-strike and toe-off. (b) Cross-section of footwear-integrated energy harvester based on the bubbler approach. Bypass check valve is not shown. (1) represents top flexible chamber filled with compressed inert gas, (2) REWOD chip, and (3) Bottom gas chamber. (c) Schematic representation of the harvester device embedded in the footwear sole.