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Herein, a flexible rolling triboelectric nanogenerator with a bionic gill cover structure (GFR\u2010TENG) to harvest steady low\u2010velocity water flow energy is proposed. The dielectric material of the GFR\u2010TENG is eight flexible hollow fluorinated ethylene propylene (FEP) pipes, which guarantees that rolling friction is formed between the dielectric material and copper electrode. This design significantly reduces wear between the dielectric material and copper electrode and enhances the durability of the triboelectric nanogenerator. Even after 1\u00a0700\u00a0000 cycles, its performance retention rate is more than 95%. The GFR\u2010TENG using the wheel with bionic whale shark gill cover structure exhibits outstanding hydrodynamic performance, increasing by 24.54% comparing the normal wheel on the rotation frequency. In the research of water parameters, the GFR\u2010TENG can steadily harvest water flow energy at a low\u2010velocity water flow of 0.22\u00a0m\u00a0s\n                    <jats:sup>\u22121<\/jats:sup>\n                    . Meanwhile, the GFR\u2010TENG can all exhibit outstanding performance at different immersion depths. Finally, a wireless temperature sensor and a wireless light sensor are each powered by the GFR\u2010TENG, which harvests energy from water flow in a natural open channel. The GFR\u2010TENG provides a novel solution method for harvesting low\u2010velocity water flow energy.\n                  <\/jats:p>","DOI":"10.1002\/smll.202409864","type":"journal-article","created":{"date-parts":[[2025,1,6]],"date-time":"2025-01-06T01:14:11Z","timestamp":1736126051000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":12,"title":["A Flexible Rolling Triboelectric Nanogenerator with a Bionic Gill Cover Structure for Low\u2010Velocity Water Flow Energy Harvesting"],"prefix":"10.1002","volume":"21","author":[{"given":"Jiacheng","family":"Zhang","sequence":"first","affiliation":[{"name":"Guangzhou Institute of Blue Energy  Guangzhou 510555 China"},{"name":"Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of Sciences  Beijing 101400 China"},{"name":"School of mechanical engineering Wuhan University of Science and Technology  Wuhan 430081 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