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Electrochemical NO\n                    <jats:sub>x<\/jats:sub>\n                    reduction reaction (eNO\n                    <jats:sub>x<\/jats:sub>\n                    RR) provides a promising route to convert NO\n                    <jats:sub>x<\/jats:sub>\n                    to benign N\n                    <jats:sub>2<\/jats:sub>\n                    under mild conditions. However, under the low NO\n                    <jats:sub>x<\/jats:sub>\n                    concentrations typical of practical exhaust streams, N\n                    <jats:sub>2<\/jats:sub>\n                    selectivity is limited by competing hydrogenation, hydrogen evolution, and inefficient intermediate utilization. Here, we present a mechanistic perspective on selective NO\n                    <jats:sub>x<\/jats:sub>\n                    \u2010to\u2010N\n                    <jats:sub>2<\/jats:sub>\n                    conversion, highlighting that eNO\n                    <jats:sub>x<\/jats:sub>\n                    RR proceeds through *NO\u2010mediated pathways with N\n                    <jats:sub>2<\/jats:sub>\n                    O as a key intermediate, while low surface coverage restricts N\u2013N coupling. We propose that integrating tandem catalysis with interfacial microenvironment regulation offers a unified strategy to enhance N\n                    <jats:sub>2<\/jats:sub>\n                    selectivity. Finally, we outline key challenges for practical implementation under gas\u2010phase and dilute conditions, providing design principles for efficient electrochemical denitrification. This framework has the potential to enable scalable NO\n                    <jats:sub>x<\/jats:sub>\n                    removal and support a closed\u2010loop ammonia energy system.\n                  <\/jats:p>","DOI":"10.1002\/adma.74253","type":"journal-article","created":{"date-parts":[[2026,7,25]],"date-time":"2026-07-25T21:27:17Z","timestamp":1785014837000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Selective Electrochemical NO\n                    <sub>x<\/sub>\n                    Reduction to N\n                    <sub>2<\/sub>\n                    for Sustainable Ammonia Energy Systems"],"prefix":"10.1002","volume":"38","author":[{"given":"Zeliang","family":"Wu","sequence":"first","affiliation":[{"name":"Department of Materials Science and Engineering National University of Singapore  Singapore Singapore"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yixin","family":"Chen","sequence":"additional","affiliation":[{"name":"Department of Materials Science and Engineering National University of Singapore  Singapore Singapore"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zuxin","family":"Wen","sequence":"additional","affiliation":[{"name":"Department of Materials Science and Engineering National University of Singapore  Singapore Singapore"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5172-3354","authenticated-orcid":false,"given":"Xianbiao","family":"Fu","sequence":"additional","affiliation":[{"name":"Department of Materials Science and Engineering National University of Singapore  Singapore Singapore"},{"name":"Centre for Hydrogen and Carbon Innovations National University of Singapore Singapore Singapore"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,7,25]]},"reference":[{"key":"e_1_2_11_2_1","doi-asserted-by":"publisher","DOI":"10.1126\/science.adf4403"},{"key":"e_1_2_11_3_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41586\u2010024\u201007276\u20105"},{"key":"e_1_2_11_4_1","doi-asserted-by":"publisher","DOI":"10.1038\/s44359\u2010025\u201000102\u20109"},{"key":"e_1_2_11_5_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.pecs.2018.07.001"},{"key":"e_1_2_11_6_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.joule.2020.04.004"},{"key":"e_1_2_11_7_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.fuel.2024.131306"},{"key":"e_1_2_11_8_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.combustflame.2021.111472"},{"key":"e_1_2_11_9_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.rser.2018.12.023"},{"key":"e_1_2_11_10_1","doi-asserted-by":"publisher","DOI":"10.1021\/jacs.1c10535"},{"key":"e_1_2_11_11_1","doi-asserted-by":"publisher","DOI":"10.1002\/ange.202108575"},{"key":"e_1_2_11_12_1","doi-asserted-by":"publisher","DOI":"10.1002\/anie.202420292"},{"key":"e_1_2_11_13_1","doi-asserted-by":"publisher","DOI":"10.1021\/acs.est.4c00765"},{"key":"e_1_2_11_14_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.protcy.2016.05.156"},{"key":"e_1_2_11_15_1","doi-asserted-by":"publisher","DOI":"10.1021\/acscatal.2c03508"},{"key":"e_1_2_11_16_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0021\u20109517(03)00052\u20106"},{"key":"e_1_2_11_17_1","doi-asserted-by":"publisher","DOI":"10.1021\/ja203234v"},{"key":"e_1_2_11_18_1","doi-asserted-by":"publisher","DOI":"10.1021\/acscatal.3c02707"},{"key":"e_1_2_11_19_1","doi-asserted-by":"publisher","DOI":"10.1038\/s44286\u2010025\u201000240\u20108"},{"key":"e_1_2_11_20_1","doi-asserted-by":"publisher","DOI":"10.1007\/978-981-19-4767-4_17"},{"key":"e_1_2_11_21_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41467\u2010023\u201035785\u2010w"},{"key":"e_1_2_11_22_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.chempr.2024.06.014"},{"key":"e_1_2_11_23_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41467\u2010024\u201047025\u2010w"},{"key":"e_1_2_11_24_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.apcatb.2018.05.041"},{"key":"e_1_2_11_25_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.elecom.2025.107964"},{"key":"e_1_2_11_26_1","doi-asserted-by":"publisher","DOI":"10.1002\/smtd.202000672"},{"key":"e_1_2_11_27_1","doi-asserted-by":"publisher","DOI":"10.1038\/s44160\u2010025\u201000851\u20102"},{"key":"e_1_2_11_28_1","doi-asserted-by":"publisher","DOI":"10.1021\/acscatal.2c04841"},{"key":"e_1_2_11_29_1","doi-asserted-by":"publisher","DOI":"10.1038\/s43586\u2010021\u201000053\u2010y"},{"key":"e_1_2_11_30_1","doi-asserted-by":"publisher","DOI":"10.1039\/c1sc00277e"},{"key":"e_1_2_11_31_1","doi-asserted-by":"publisher","DOI":"10.1063\/1.1767153"},{"key":"e_1_2_11_32_1","doi-asserted-by":"publisher","DOI":"10.1021\/jp9930907"},{"key":"e_1_2_11_33_1","doi-asserted-by":"publisher","DOI":"10.1006\/jcat.2001.3275"},{"key":"e_1_2_11_34_1","doi-asserted-by":"publisher","DOI":"10.1039\/D2CY00389A"},{"key":"e_1_2_11_35_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41467\u2010022\u201032601\u20109"},{"key":"e_1_2_11_36_1","doi-asserted-by":"publisher","DOI":"10.1002\/cctc.202301545"},{"key":"e_1_2_11_37_1","doi-asserted-by":"publisher","DOI":"10.1126\/sciadv.adq4696"},{"key":"e_1_2_11_38_1","doi-asserted-by":"publisher","DOI":"10.1126\/science.ado9938"},{"key":"e_1_2_11_39_1","doi-asserted-by":"publisher","DOI":"10.1002\/anie.202307952"},{"key":"e_1_2_11_40_1","doi-asserted-by":"publisher","DOI":"10.1021\/jacs.4c16057"},{"key":"e_1_2_11_41_1","doi-asserted-by":"publisher","DOI":"10.1002\/anie.202002337"},{"key":"e_1_2_11_42_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41560\u2010023\u201001386\u20106"},{"key":"e_1_2_11_43_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41467\u2010025\u201067244\u2010z"},{"key":"e_1_2_11_44_1","doi-asserted-by":"publisher","DOI":"10.1021\/acsenergylett.0c02082"},{"key":"e_1_2_11_45_1","doi-asserted-by":"publisher","DOI":"10.1038\/s44286\u2010024\u201000076\u20108"},{"key":"e_1_2_11_46_1","doi-asserted-by":"publisher","DOI":"10.1038\/s44286\u2010024\u201000035\u20103"},{"key":"e_1_2_11_47_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41929\u2010019\u20100269\u20108"},{"key":"e_1_2_11_48_1","doi-asserted-by":"publisher","DOI":"10.1039\/D1RE00001B"},{"key":"e_1_2_11_49_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.joule.2020.12.004"},{"key":"e_1_2_11_50_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.joule.2020.07.009"},{"key":"e_1_2_11_51_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.xcrp.2020.100051"},{"key":"e_1_2_11_52_1","doi-asserted-by":"publisher","DOI":"10.1021\/jacs.8b12381"},{"key":"e_1_2_11_53_1","doi-asserted-by":"publisher","DOI":"10.1093\/nsr\/nwae147"},{"key":"e_1_2_11_54_1","doi-asserted-by":"publisher","DOI":"10.1021\/acscatal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