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Fossil fuels leaded the 21st century industrial revolution but caused some critical problems such as exhaustion of resources and global warming. Also, current power plants require too much high cost and long time for establishment and facilities to provide electricity. Thus, developing new power production systems with environmental friendliness and low-cost is critical global needs. There are some emerging energy harvesting technologies such as thermoelectric, piezoelectric, and triboelectric nanogenerators, which have great advantages on eco-friendly low-cost materials, simple fabrication, and various operating sources. Since the introduction of various energy harvesting technologies, many novel designs and applications as power suppliers and physical sensors in the world have been demonstrated based on their unique advantages. In this Special Issue, we would like to address and share basic approaches, new designs, and industrial applications related to thermoelectric, piezoelectric, and triboelectric devices which are on-going in Korea. With this Special Issue, we aim to promote fundamental understanding and to find novel ways to achieve industrial product manufacturing for energy harvesters.

energy harvesting --- thermoelectric generator --- railroad vehicle --- rolling stock --- axle bearing --- TiO_2?x nanoparticle --- high dielectric constant --- triboelectric nanogenerators --- oxygen vacancy --- ferroelectric --- PVDF --- piezoelectric --- mechanical fatigue resistance --- remnant polarization --- PVDF --- sensor --- triboelectric nanogenerator --- triboelectric nanogenerator --- nanoimprinting --- nanostructures --- microstructures --- femtosecond laser --- energy harvesting --- triboelectric nanogenerator --- superhydrophobic surface --- spray method --- mechanical energy --- triboelectric nanogenerator --- energy harvesting --- hybrid energy --- water wave energy --- thermoelectric --- layer-by-layer --- graphene --- carbon nanotube --- thin film --- thermoelectric --- graphene --- carbon nanotubes --- power factor --- polymers --- energy harvesting --- organic composites --- mesoporous composite polymer --- metal oxidation --- gapless --- triboelectric nanogenerator --- high deformability --- energy-harvesting metamaterial --- wireless chemical sensor --- metamaterial sensor --- triboelectric generator --- shock absorber --- suspension system --- advanced driver assistance technology --- IoT technology --- frictional force --- n/a