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Herein, low\u2010cost self\u2010supporting carbon fiber was used as a carrier to successfully prepare uniform\u2010sized Fe\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>3<\/jats:sub>\n                    nanoarrays with four\u2010corner double cone morphology (named Fe\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>3<\/jats:sub>\n                    \/CF) through a one\u2010step in situ growth method. Fe\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>3<\/jats:sub>\n                    \/CF exhibits excellent performance in the electrocatalytic reduction of nitrate to ammonia: it maintains stable activity in a wide pH range and exhibits significant resistance to common interfering ions in complex water; The Faradaic efficiency of ammonia generation can reach 95%, and it has good long\u2010term stability. The open\u2010circuit voltage of 1.37\u00a0V and the power density of 12.3\u00a0mW cm\n                    <jats:sup>\u22122<\/jats:sup>\n                    can be achieved in the Zn\u2010NO\n                    <jats:sub>3<\/jats:sub>\n                    <jats:sup>\u2212<\/jats:sup>\n                    battery system based on Fe\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>3<\/jats:sub>\n                    \/CF. Ammonia synthesis with low carbon emission and continuous production of liquid nitrogen fertilizer are realized by using solar power generation module. Combined with non\u2010thermal plasma air activation technology, the green stepwise conversion of \u201cair\u2010nitrogen oxides\u2010ammonia\u201d can also be efficiently completed. Experiments and theoretical demonstrate that the Fe\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>3<\/jats:sub>\n                    nanoarray uniformly dispersed on the surface of carbon fibers enables efficient and highly selective reduction of nitrate to ammonia by exposing specific crystal planes and providing high\u2010density active sites.\n                  <\/jats:p>","DOI":"10.1002\/smll.74160","type":"journal-article","created":{"date-parts":[[2026,7,10]],"date-time":"2026-07-10T10:38:22Z","timestamp":1783679902000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Iron\u2010Oxide Nanoarrays Covered Carbon Fiber Promotes Ammonia Electrosynthesis and Multi\u2010Scenario Applications"],"prefix":"10.1002","volume":"22","author":[{"given":"Zhikang","family":"Wu","sequence":"first","affiliation":[{"name":"School of Materials and Energy Institute For Ecological Research and Pollution Control of Plateau Lakes School of Ecology and Environmental Science Yunnan University  Kunming P. 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