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Electrochemical reduction of reactive nitrogen oxides (NO\n                    <jats:sub>x<\/jats:sub>\n                    ) offers a sustainable alternative, but its selectivity faces significant mechanistic challenges because the thermodynamically unstable NH\n                    <jats:sub>2<\/jats:sub>\n                    OH is easily over\u2010reduced to ammonia (NH\n                    <jats:sub>3<\/jats:sub>\n                    ). This review systematically investigated the current development for the electrochemical synthesis of NH\n                    <jats:sub>2<\/jats:sub>\n                    OH. First, the reaction mechanism was explained in detail with an emphasis on the *NHO pathway and linear adsorption configuration for maintaining the N\u2500O bond. Second, the design strategies of various catalysts were surveyed. Furthermore, we discussed capture methods for NH\n                    <jats:sub>2<\/jats:sub>\n                    OH using ketones and aldehydes, which produces value\u2010added oxime compounds while avoiding over reduction. Finally, outlooks were presented to guide further directions. We believe that the review will advance the future research and industrialization process of e\u2010NO\n                    <jats:sub>x<\/jats:sub>\n                    R.\n                  <\/jats:p>","DOI":"10.1002\/smll.75171","type":"journal-article","created":{"date-parts":[[2026,8,10]],"date-time":"2026-08-10T16:49:02Z","timestamp":1786380542000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Recent Advances in Electrocatalytic Reduction of Nitrogen Oxides to Hydroxylamine"],"prefix":"10.1002","author":[{"ORCID":"https:\/\/orcid.org\/0009-0002-9137-8756","authenticated-orcid":false,"given":"Xingyou","family":"Li","sequence":"first","affiliation":[{"name":"Institute of Applied Physics and Materials Engineering University of Macau  Taipa Macao People's Republic of China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0003-9193-5601","authenticated-orcid":false,"given":"Di","family":"Liu","sequence":"additional","affiliation":[{"name":"Institute of Applied Physics and Materials Engineering University of Macau  Taipa Macao People's Republic of China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0009-7830-4526","authenticated-orcid":false,"given":"Zhichao","family":"Yu","sequence":"additional","affiliation":[{"name":"Institute of Applied Physics and Materials Engineering University of Macau  Taipa Macao People's Republic of China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6843-8717","authenticated-orcid":false,"given":"Weng Fai","family":"Ip","sequence":"additional","affiliation":[{"name":"Department of Physics and Chemistry Faculty of Science and Technology University of Macau  Taipa Macao People's Republic of China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8464-4994","authenticated-orcid":false,"given":"Shuang\u2010Peng","family":"Wang","sequence":"additional","affiliation":[{"name":"Institute of Applied Physics and Materials Engineering University of Macau  Taipa Macao People's Republic of China"},{"name":"Department of Physics and Chemistry Faculty of Science and Technology University of Macau  Taipa Macao People's Republic of China"},{"name":"Macao Centre for Research and Development in Advanced Materials University of Macau  Taipa Macao People's Republic of China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6515-4970","authenticated-orcid":false,"given":"Hui","family":"Pan","sequence":"additional","affiliation":[{"name":"Institute of Applied Physics and Materials Engineering University of Macau  Taipa Macao People's Republic of China"},{"name":"Department of Physics and Chemistry Faculty of Science and Technology University of Macau  Taipa Macao People's Republic of China"},{"name":"Macao Centre for Research and Development in Advanced Materials University of Macau  Taipa Macao People's Republic of China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,8,10]]},"reference":[{"key":"e_1_2_13_2_1","doi-asserted-by":"publisher","DOI":"10.1021\/acssuschemeng.3c03336"},{"key":"e_1_2_13_3_1","doi-asserted-by":"publisher","DOI":"10.1021\/ie5044665"},{"key":"e_1_2_13_4_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.copbio.2018.01.014"},{"key":"e_1_2_13_5_1","doi-asserted-by":"publisher","DOI":"10.1073\/pnas.1704504114"},{"key":"e_1_2_13_6_1","doi-asserted-by":"publisher","DOI":"10.1016\/s0021\u20109673(02)00145\u20100"},{"key":"e_1_2_13_7_1","doi-asserted-by":"publisher","DOI":"10.1021\/jacs.1c12663"},{"key":"e_1_2_13_8_1","doi-asserted-by":"publisher","DOI":"10.1002\/anie.202305491"},{"key":"e_1_2_13_9_1","doi-asserted-by":"publisher","DOI":"10.1002\/smll.202404477"},{"key":"e_1_2_13_10_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41467\u2010023\u201038888\u20106"},{"key":"e_1_2_13_11_1","doi-asserted-by":"publisher","DOI":"10.1162\/jiec.1999.3.2\u20103.192"},{"key":"e_1_2_13_12_1","doi-asserted-by":"publisher","DOI":"10.3390\/61201064"},{"key":"e_1_2_13_13_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.apcatb.2022.122293"},{"issue":"10","key":"e_1_2_13_14_1","first-page":"14246","article-title":"Cu\/2D\u2010CuO x Nanocomposites with Abundant Oxygen Vacancy Defects for Enhancing Ammonia Selectivity of Electrocatalytic Nitrate Reduction","volume":"5","author":"He X.","year":"2022","journal-title":"ACS Applied Nano Materials"},{"key":"e_1_2_13_15_1","doi-asserted-by":"publisher","DOI":"10.1002\/anie.202110879"},{"key":"e_1_2_13_16_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.mtphys.2022.100944"},{"issue":"6","key":"e_1_2_13_17_1","doi-asserted-by":"crossref","first-page":"1186","DOI":"10.1016\/j.joule.2020.04.004","article-title":"A Roadmap to the Ammonia Economy","volume":"4","author":"MacFarlane D. 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