{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,6]],"date-time":"2026-05-06T20:54:06Z","timestamp":1778100846044,"version":"3.51.4"},"reference-count":37,"publisher":"MDPI AG","issue":"9","license":[{"start":{"date-parts":[[2016,9,15]],"date-time":"2016-09-15T00:00:00Z","timestamp":1473897600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>Biomechanical energy harvesting is a feasible solution for powering wearable sensors by directly driving electronics or acting as wearable self-powered sensors. A wearable insole that not only can harvest energy from foot pressure during walking but also can serve as a self-powered human motion recognition sensor is reported. The insole is designed as a sandwich structure consisting of two wavy silica gel film separated by a flexible piezoelectric foil stave, which has higher performance compared with conventional piezoelectric harvesters with cantilever structure. The energy harvesting insole is capable of driving some common electronics by scavenging energy from human walking. Moreover, it can be used to recognize human motion as the waveforms it generates change when people are in different locomotion modes. It is demonstrated that different types of human motion such as walking and running are clearly classified by the insole without any external power source. This work not only expands the applications of piezoelectric energy harvesters for wearable power supplies and self-powered sensors, but also provides possible approaches for wearable self-powered human motion monitoring that is of great importance in many fields such as rehabilitation and sports science.<\/jats:p>","DOI":"10.3390\/s16091502","type":"journal-article","created":{"date-parts":[[2016,9,15]],"date-time":"2016-09-15T10:22:51Z","timestamp":1473934971000},"page":"1502","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":42,"title":["A Self-Powered Insole for Human Motion Recognition"],"prefix":"10.3390","volume":"16","author":[{"given":"Yingzhou","family":"Han","sequence":"first","affiliation":[{"name":"Collaborative Innovation Center for Micro\/Nano Fabrication, Device and System, Tsinghua University, Beijing 100084, China"},{"name":"State Key Laboratory of Precision Measurement Technology and Instruments, Tsinghua University, Beijing 100084, China"},{"name":"Department of Precision Instrument, Tsinghua University, Beijing 100084, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yalu","family":"Cao","sequence":"additional","affiliation":[{"name":"Collaborative Innovation Center for Micro\/Nano Fabrication, Device and System, Tsinghua University, Beijing 100084, China"},{"name":"State Key Laboratory of Precision Measurement Technology and Instruments, Tsinghua University, Beijing 100084, China"},{"name":"Department of Precision Instrument, Tsinghua University, Beijing 100084, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jingjing","family":"Zhao","sequence":"additional","affiliation":[{"name":"Collaborative Innovation Center for Micro\/Nano Fabrication, Device and System, Tsinghua University, Beijing 100084, China"},{"name":"State Key Laboratory of Precision Measurement Technology and Instruments, Tsinghua University, Beijing 100084, 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Tsinghua University, Beijing 100084, China"},{"name":"Department of Precision Instrument, Tsinghua University, Beijing 100084, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Xiaofeng","family":"Wang","sequence":"additional","affiliation":[{"name":"Collaborative Innovation Center for Micro\/Nano Fabrication, Device and System, Tsinghua University, Beijing 100084, China"},{"name":"State Key Laboratory of Precision Measurement Technology and Instruments, Tsinghua University, Beijing 100084, China"},{"name":"Department of Precision Instrument, Tsinghua University, Beijing 100084, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Zheng","family":"You","sequence":"additional","affiliation":[{"name":"Collaborative Innovation Center for Micro\/Nano Fabrication, Device and System, Tsinghua University, Beijing 100084, China"},{"name":"State Key Laboratory of Precision Measurement Technology and Instruments, Tsinghua University, Beijing 100084, 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excitations","volume":"24","author":"Ylli","year":"2015","journal-title":"Smart Mater. Struct."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"3521","DOI":"10.1021\/nn507455f","article-title":"Hybridized Electromagnetic-Triboelectric Nanogenerator for Scavenging Biomechanical Energy for Sustainably Powering Wearable Electronics","volume":"9","author":"Zhang","year":"2015","journal-title":"ACS Nano"},{"key":"ref_5","doi-asserted-by":"crossref","unstructured":"Kornbluh, R.D., Pelrine, R., Pei, Q., Heydt, R., Stanford, S., Oh, S., and Eckerle, J. (2002, January 17). Electroelastomers: Applications of dielectric elastomer transducers for actuation, generation, and smart structures. Proceedings of the SPIE\u2018s Smart Structures and Materials 2002: Industrial and Commercial Applications of Smart Structures Technologies, San Diego, CA, USA.","DOI":"10.1117\/12.475072"},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"1079","DOI":"10.1007\/s00542-006-0152-9","article-title":"MEMS inertial power generators for biomedical applications","volume":"12","author":"Miao","year":"2006","journal-title":"Microsyst. Technol."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"650","DOI":"10.1109\/JSEN.2007.894917","article-title":"Thermoelectric converters of human warmth for self-powered wireless sensor nodes","volume":"7","author":"Leonov","year":"2007","journal-title":"IEEE Sens. J."},{"key":"ref_8","doi-asserted-by":"crossref","unstructured":"Stevens, J.W. (1999, January 2\u20135). Optimized thermal design of small \u0394T thermoelectric generators. Proceedings of the 34th Intersociety Energy Conversion Engineering Conference, Vancouver, BC, Canada.","DOI":"10.4271\/1999-01-2564"},{"key":"ref_9","doi-asserted-by":"crossref","unstructured":"Ramadass, Y.K., and Chandrakasan, A.P. (2010, January 7\u201311). A Batteryless Thermoelectric Energy-Harvesting Interface Circuit with 35 mV Startup Voltage. Proceedings of the 2010 IEEE International Solid-State Circuits Conference Digest of Technical Papers (ISSCC), San Diego, CA, USA.","DOI":"10.1109\/ISSCC.2010.5433835"},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"317","DOI":"10.1109\/JMEMS.2010.2041035","article-title":"Design, fabrication, and characterization of CMOS MEMS-based thermoelectric power generators","volume":"19","author":"Xie","year":"2010","journal-title":"J. Microelectromechan. Syst."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"e1501624","DOI":"10.1126\/sciadv.1501624","article-title":"A highly shape-adaptive, stretchable design based on conductive liquid for energy harvesting and self-powered biomechanical monitoring","volume":"2","author":"Yi","year":"2016","journal-title":"Sci. Adv."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"688","DOI":"10.1016\/j.nanoen.2013.08.002","article-title":"Power-generating shoe insole based on triboelectric nanogenerators for self-powered consumer electronics","volume":"2","author":"Zhu","year":"2013","journal-title":"Nano Energy"},{"key":"ref_13","doi-asserted-by":"crossref","unstructured":"Niu, S., Wang, X., Yi, F., Zhou, Y.S., and Wang, Z.L. (2015). A universal self-charging system driven by random biomechanical energy for sustainable operation of mobile electronics. Nat. Commun., 6.","DOI":"10.1038\/ncomms9975"},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"9213","DOI":"10.1021\/nn403838y","article-title":"Human skin based triboelectric nanogenerators for harvesting biomechanical energy and as self-powered active tactile sensor system","volume":"7","author":"Yang","year":"2013","journal-title":"ACS Nano"},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"30","DOI":"10.1109\/40.928763","article-title":"Energy scavenging with shoe-mounted piezoelectrics","volume":"21","author":"Shenck","year":"2001","journal-title":"IEEE Micro"},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"405","DOI":"10.1016\/j.sna.2005.10.043","article-title":"A comparison between several vibration-powered piezoelectric generators for standalone systems","volume":"126","author":"Lefeuvre","year":"2006","journal-title":"Sens. Actuators A Phys."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"868","DOI":"10.1109\/TIE.2009.2030761","article-title":"Improving power density of a cantilever piezoelectric power harvester through a curved L-shaped proof mass","volume":"57","author":"Li","year":"2010","journal-title":"IEEE Trans. Ind. Electron."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"115011","DOI":"10.1088\/0964-1726\/19\/11\/115011","article-title":"Harvested power and sensitivity analysis of vibrating shoe-mounted piezoelectric cantilevers","volume":"19","author":"Moro","year":"2010","journal-title":"Smart Mater. Struct."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"1759","DOI":"10.1002\/adma.201200150","article-title":"A hybrid piezoelectric structure for wearable nanogenerators","volume":"24","author":"Lee","year":"2012","journal-title":"Adv. Mater."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"12497","DOI":"10.3390\/s140712497","article-title":"A shoe-embedded piezoelectric energy harvester for wearable sensors","volume":"14","author":"Zhao","year":"2014","journal-title":"Sensors"},{"key":"ref_21","doi-asserted-by":"crossref","unstructured":"Hessert, M.J., Vyas, M., Leach, J., Hu, K., Lipsitz, L.A., and Novak, V. (2005). Foot pressure distribution during walking in young and old adults. BMC Geriatr., 5.","DOI":"10.1186\/1471-2318-5-8"},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"215","DOI":"10.1177\/0142331207069487","article-title":"Body segment position reconstruction and posture classification by smart textiles","volume":"29","author":"Tognetti","year":"2007","journal-title":"Trans. Inst. Meas. Control"},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"199","DOI":"10.1515\/aut-2002-020404","article-title":"Smart textiles for wearable motion capture systems","volume":"2","author":"Mazzoldi","year":"2002","journal-title":"AUTEX Res. J."},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"156","DOI":"10.1109\/TITB.2005.856864","article-title":"Implementation of a real-time human movement classifier using a triaxial accelerometer for ambulatory monitoring","volume":"10","author":"Karantonis","year":"2006","journal-title":"IEEE Trans. Inf. Technol. Biomed."},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"1098","DOI":"10.1109\/TITB.2010.2050696","article-title":"A real-time and self-calibrating algorithm based on triaxial accelerometer signals for the detection of human posture and activity","volume":"14","author":"Curone","year":"2010","journal-title":"IEEE Trans. Inf. Technol. Biomed."},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"1721","DOI":"10.3390\/s110201721","article-title":"Leg motion classification with artificial neural networks using wavelet-based features of gyroscope signals","volume":"11","author":"Barshan","year":"2011","journal-title":"Sensors"},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"8508","DOI":"10.3390\/s91108508","article-title":"Classifying human leg motions with uniaxial piezoelectric gyroscopes","volume":"9","author":"Altun","year":"2009","journal-title":"Sensors"},{"key":"ref_28","doi-asserted-by":"crossref","unstructured":"Dominguez, G., Cardiel, E., Arias, S., and Rogeli, P. (2013, January 12\u201314). A Digital Goniometer based on encoders for measuring knee-joint position in an orthosis. Proceedings of the 2013 World Congress on Nature and Biologically Inspired Computing (NaBIC), Fargo, ND, USA.","DOI":"10.1109\/NaBIC.2013.6617835"},{"key":"ref_29","doi-asserted-by":"crossref","unstructured":"Wahab, Y., and Bakar, N.A. (2011, January 14\u201317). Gait analysis measurement for sport application based on ultrasonic system. Proceedings of the 2011 IEEE 15th International Symposium on Consumer Electronics (ISCE), Singapore.","DOI":"10.1109\/ISCE.2011.5973775"},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"012044","DOI":"10.1088\/1742-6596\/495\/1\/012044","article-title":"Low power shoe integrated intelligent wireless gait measurement system","volume":"495","author":"Wahab","year":"2014","journal-title":"J. Phys. Conf. Ser."},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"413","DOI":"10.1109\/TITB.2007.899493","article-title":"Gait analysis using a shoe-integrated wireless sensor system","volume":"12","author":"Bamberg","year":"2008","journal-title":"IEEE Trans. Inf. Technol. Biomed."},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"646","DOI":"10.1016\/j.mechatronics.2013.06.007","article-title":"A tele-monitoring system for gait rehabilitation with an inertial measurement unit and a shoe-type ground reaction force sensor","volume":"23","author":"Bae","year":"2013","journal-title":"Mechatronics"},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"3688","DOI":"10.1002\/adfm.201500428","article-title":"Stretchable-Rubber-Based Triboelectric Nanogenerator and Its Application as Self-Powered Body Motion Sensors","volume":"25","author":"Yi","year":"2015","journal-title":"Adv. Funct. Mater."},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"1316","DOI":"10.1002\/adma.201404794","article-title":"Eardrum-Inspired Active Sensors for Self-Powered Cardiovascular System Characterization and Throat-Attached Anti-Interference Voice Recognition","volume":"27","author":"Yang","year":"2015","journal-title":"Adv. Mater."},{"key":"ref_35","doi-asserted-by":"crossref","unstructured":"Lee, K.Y., Yoon, H.J., Jiang, T., Wen, X., Seung, W., Kim, S.W., and Wang, Z.L. (2016). Fully Packaged Self-Powered Triboelectric Pressure Sensor Using Hemispheres-Array. Adv. Energy Mater., 6.","DOI":"10.1002\/aenm.201502566"},{"key":"ref_36","unstructured":"Wang, X., Wang, Q., Zheng, E., Wei, K., and Wang, L. (2013). Intelligent Autonomous Systems 12, Springer."},{"key":"ref_37","unstructured":"Salpavaara, T., Verho, J., Lekkala, J., and Halttune, J. (2009, January 6\u201311). Wireless insole sensor system for plantar force measurements during sport events. Proceedings of the IMEKO XIX World Congress on Fundamental and Applied Metrology, Lisbon, Portuga."}],"container-title":["Sensors"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1424-8220\/16\/9\/1502\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T19:31:00Z","timestamp":1760211060000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1424-8220\/16\/9\/1502"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2016,9,15]]},"references-count":37,"journal-issue":{"issue":"9","published-online":{"date-parts":[[2016,9]]}},"alternative-id":["s16091502"],"URL":"https:\/\/doi.org\/10.3390\/s16091502","relation":{},"ISSN":["1424-8220"],"issn-type":[{"value":"1424-8220","type":"electronic"}],"subject":[],"published":{"date-parts":[[2016,9,15]]}}}