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Extensive efforts are underway to develop semiconductor photocatalysts for water disinfection and environmental remediation, but conventional liquid\u2010solid diphase interfacial photocatalysts face challenges like low diffusion coefficients and limited solubility of dissolved oxygen. This study introduces freestanding copper oxide fluffy pine needle structures (CO\u2010FPNs) with tunable water pollutants\u2010gas\u2010solid (WGS) triple\u2010phase interfaces that enhance oxygen enrichment and reactive oxygen species (ROS) production. Three differently structured CO\u2010FPNs\u2014microdendrites, hierarchical dendrites, and nanowires\u2014are designed. The hierarchical CO\u2010FPN\/WGS, predominantly in the Cassie\u2010Wenzel coexistence state, showed a 1.81\u2010 to 1.91\u2010fold higher reaction rate than the micro\u2010 and nanostructured CO\u2010FPNs due to increased interfacial O<jats:sub>2<\/jats:sub> levels and high adsorption capability. Under illumination, the hierarchical CO\u2010FPN\/WGS achieved 99.999% sterilization by preventing pathogen adhesion and enhancing ROS generation. Additionally, a self\u2010powered photoelectrocatalytic system is constructed using nickel\u2010iron oxide\u2010deposited bismuth vanadate (NiFeO\/BiVO<jats:sub>4<\/jats:sub>) with hierarchical CO\u2010FPN\/WGS, achieving 1.45 times higher than the hierarchical CO\u2010FPN\/WGS alone, due to superior oxidation kinetics of NiFeO\/BiVO<jats:sub>4<\/jats:sub> and improved oxygen reduction via atmospheric oxygen from the hierarchical CO\u2010FPN\/WGS. This study demonstrates the first example of a triple\u2010phase interfacial self\u2010powered platform for efficient photoelectrocatalysis.<\/jats:p>","DOI":"10.1002\/smll.202409518","type":"journal-article","created":{"date-parts":[[2024,12,24]],"date-time":"2024-12-24T07:39:42Z","timestamp":1735025982000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Triple\u2010Phase Interfacial Freestanding Fluffy Pine Needle Structures for Efficient Self\u2010Powered Photoelectrocatalysis"],"prefix":"10.1002","volume":"21","author":[{"given":"Hyunhee","family":"Jung","sequence":"first","affiliation":[{"name":"Department of Fiber Convergence Material Engineering Dankook University  Gyeonggi\u2010Do 16890 Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Seunghui","family":"Baek","sequence":"additional","affiliation":[{"name":"Department of Fiber Convergence Material Engineering Dankook 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