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Devices that collect data about our bodies need power, but they also might need to be very small or even ingestible. To avoid including batteries in these cases, researchers are looking for ways to harvest energy from the body itself.

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Sources:
General
https://www.sciencedirect.com/science/article/abs/pii/S0956566320304048?via%3Dihub

Heat
https://iopscience.iop.org/article/10.1088/0964-1726/23/10/105002/pdf
https://www.sciencedirect.com/science/article/abs/pii/S0196890417311172J1xYAAAAA:J9SuD5CfnLZ7JM14S5FhK2ODX33WW-ikNGxPojuMwLzYIlPj0J7zeU1lxhySGvw7_WPB4hAbOg
https://www.sciencedirect.com/science/article/pii/S0924424709000818?casa_token=cn75R9zCs9MAAAAA:KczaLgQkzzkV2Oq6P9S0HdLtjGsIGH8Ry4MrdHRp9zSa9Nkl82ov5xLEleUIqMESkvIs1NMy7qo
https://www.researchgate.net/profile/V-Leonov-2/publication/267816893_Energy_Harvesting_for_Self-Powered_Wearable_Devices/links/54c20f470cf2dd3cb9591414/Energy-Harvesting-for-Self-Powered-Wearable-Devices.pdf
https://www.mdpi.com/1424-8220/20/1/61/htm

https://www.sciencedirect.com/science/article/abs/pii/S0306261918305452
https://www.britannica.com/science/pyroelectricity
https://pubs.acs.org/doi/10.1021/acsanm.9b00033
https://books.google.co.uk/books?id=VXQdq0B3tnUC&pg=SA32-PA113&redir_esc=y#v=onepage&q&f=false


Motion
https://pubs.acs.org/doi/10.1021/acsnano.0c09803
https://pubs.acs.org/doi/full/10.1021/acsnano.7b02975
https://www.sciencedirect.com/science/article/pii/S1748013220300517?casa_token=3GkoTyknatoAAAAA:C-JngY1yOFoC0KGgP3gouSzhncLYj62XiV14jiGsB6WCQ9pKk5yd9ZhtW7yvgmeE34AFldU1stU
http://nanofm.mse.gatech.edu/Papers/Liu_et_al-2018-Advanced_Materials.pdf

https://www.sciencedirect.com/science/article/pii/S0924424716303831?casa_token=37FmFTcSkcAAAAAA:b9VgWbyk5jTan2t3JcXvCmAGIc40fkkyOjizFB10Kdavmo1wvKFJ191BrIKmMnfT_HrFi34uO_U
https://link.springer.com/chapter/10.1007/978-981-16-5157-1_18
https://www.sciencedirect.com/science/article/pii/S0924424708001398?casa_token=WiXQvEBF9EsAAAAA:SKVLriJuYTZ3uixUiwogWOPIrN1Hx84NLFQ3lwYb0zO7dJjrII45Ku2Cn8iK3v2F8xC5unD0yqQ
https://www.researchgate.net/profile/Ichiro-Yamada-3/publication/320998442_Investigation_of_Kinetic_Energy_Harvesting_from_Human_Body_Motion_Activities_using_FreeImpact_Based_Micro_Electromagnetic_Generator/links/5a0645ecaca272ed279c47d0/Investigation-of-Kinetic-Energy-Harvesting-from-Human-Body-Motion-Activities-using-Free-Impact-Based-Micro-Electromagnetic-Generator.pdf

Smaller motion
https://iopscience.iop.org/article/10.1088/0964-1726/18/3/035001/meta?casa_token=RSm_xuHyk9kAAAAA:HNkyNVo0UR38GcO4T9FtgHxpiV_S_3BbN9lL9rvTO9bosN5KYdyg5iRZTZvazP7Ei6kKvG85Pg
https://ieeexplore.ieee.org/abstract/document/1496534?casa_token=di1vaj7XGt4AAAAA:ubU4WkPtvuqhmh9ymzW4louTwpG1qleuDmjJ4hJPdoqOrPsKvjJqiwffhdD3TIvrnTxNGjEN3Q
https://www.sciencedirect.com/science/article/abs/pii/S0956566320304048?via%3Dihub
https://onlinelibrary.wiley.com/doi/abs/10.1002/adfm.202008242

Sweat
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5371639/
https://www.nature.com/articles/s41928-020-0443-7
https://pubs.acs.org/doi/full/10.1021/acssensors.8b01218

Stomach acid
https://www.nature.com/articles/s41551-016-0022
https://www.mdpi.com/2079-9292/8/7/804

Images
https://commons.wikimedia.org/wiki/File:ElectricCurrent.gif
https://commons.wikimedia.org/wiki/File:Thermoelectric_Generator_Diagram.svg
https://commons.wikimedia.org/wiki/File:Thermoelectric_glove.jpg
https://commons.wikimedia.org/wiki/File:Pyroelectric_material.svg
https://commons.wikimedia.org/wiki/File:Attractive-electric-force-between-hair-and-balloon.jpg
https://commons.wikimedia.org/wiki/File:Lateral_sliding_mode_of_triboelectric_nanogenerator.tif
https://commons.wikimedia.org/wiki/File:Perovskite.svg
https://commons.wikimedia.org/wiki/File:%D8%B4%D9%85%D8%A7%D8%AA%DB%8C%DA%A9_%D8%A7%D8%AB%D8%B1_%D9%BE%DB%8C%D8%B2%D9%88%D8%A7%D9%84%DA%A9%D8%AA%D8%B1%DB%8C%DA%A9.jpg
https://news.mit.edu/2017/engineers-harness-stomach-acid-power-tiny-sensors-0206
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