Fig. 3.

Research progress in 3D printed MEH systems a Growth in publications and citations related to 3D printed MEH devices, b leading journals in the flourishment of 3DP nano MEH research, c significant research areas of the published literature, d the most influential keywords in the study of 3D-printed nano MEH systems, e the most prolific institutions contributing to the enhancement of nano MEH research, Results were obtained from postprocessing of the data, retrieved from Web of Science using search keywords {TOPIC: ((“3D Printed” OR “3DP” OR “3D printing”)) AND TOPIC: ((“energy convertor” or “Triboelectric” OR “Piezoelectric” OR “Thermoelectric” or “nanogenerator” OR “Nano-energy harvester” OR “Biomechanical energy” OR “human movements” OR “Nano energy” or “Mechanical energy” OR “Energy harvesting” OR “linear generator” OR “Energy harvester” OR “Electromagnetic generator”)), Refined by: Document types: (Article or Review) and Research domains: (Science & Technology) and Languages: (English), Timespan: 2010–2021. Databases: WOS, CSCD, DIIDW, KJD, MEDLINE, RSCI, SCIELO}