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Here, we demonstrate for the first time that impurity cations, particularly Fe ions, compromise the long\u2010term structural stability of the Raney Ni cathode. The accumulation of Fe species on the cathode surface promotes the two\u2010electron reduction of crossover oxygen and the formation of HO\n                    <jats:sub>2<\/jats:sub>\n                    \u2022 radicals that drive oxidative corrosion of Ni sites. We then introduce a Lewis\u2010acidic CeO\n                    <jats:sub>x<\/jats:sub>\n                    layer on the cathode surface for protection. The layer effectively suppresses the reductive deposition of Fe on the cathode, while coordinatively unsaturated high\u2010valent Ce sites directly scavenge the reactive radicals. As a result, the protected Raney Ni cathode demonstrates marked stability in Fe\u2010containing electrolyte, maintaining stable operation over 3,500\u00a0h at 1.0 A cm\n                    <jats:sup>\u22122<\/jats:sup>\n                    and 15,000 accelerated startup\u2013shutdown cycles. Notably, this strategy exhibits strong feasibility and universality under practical operating conditions, maintaining stable cathode performance in the presence of up to 200 \u00b5M Fe(III) or various impurity cations derived from system components, including Co(II), Mn(II), Mo(VI), Cr(III), and Al(III).\n                  <\/jats:p>","DOI":"10.1002\/anie.6363490","type":"journal-article","created":{"date-parts":[[2026,10,6]],"date-time":"2026-10-06T02:59:12Z","timestamp":1791255552000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Suppressing Cathode Corrosion Induced by Impurity Cations in Alkaline Water Electrolyzers"],"prefix":"10.1002","author":[{"given":"Xiaogang","family":"Sun","sequence":"first","affiliation":[{"name":"School of Chemical Engineering Adelaide University  Adelaide SA Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Fei\u2010Yue","family":"Gao","sequence":"additional","affiliation":[{"name":"School of Chemical Engineering Adelaide University  Adelaide SA Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2411-8041","authenticated-orcid":false,"given":"Yao","family":"Zheng","sequence":"additional","affiliation":[{"name":"School of Chemical Engineering Adelaide University  Adelaide SA Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4568-8422","authenticated-orcid":false,"given":"Shi\u2010Zhang","family":"Qiao","sequence":"additional","affiliation":[{"name":"School of Chemical Engineering Adelaide University  Adelaide SA Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,10,5]]},"reference":[{"key":"e_1_2_8_2_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41929\u2010019\u20100325\u20104"},{"key":"e_1_2_8_3_1","doi-asserted-by":"publisher","DOI":"10.1002\/anie.201804881"},{"key":"e_1_2_8_4_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41929\u2010024\u201001209\u20101"},{"key":"e_1_2_8_5_1","doi-asserted-by":"publisher","DOI":"10.1021\/acscatal.5c07090"},{"key":"e_1_2_8_6_1","doi-asserted-by":"publisher","DOI":"10.1007\/s12274\u2010017\u20101750\u20109"},{"key":"e_1_2_8_7_1","doi-asserted-by":"publisher","DOI":"10.1039\/D5EE04506A"},{"key":"e_1_2_8_8_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.ijhydene.2022.07.175"},{"key":"e_1_2_8_9_1","doi-asserted-by":"publisher","DOI":"10.1039\/D5SC01380A"},{"key":"e_1_2_8_10_1","doi-asserted-by":"publisher","DOI":"10.3390\/molecules29225298"},{"key":"e_1_2_8_11_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.rineng.2025.108151"},{"key":"e_1_2_8_12_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.ijhydene.2024.06.342"},{"key":"e_1_2_8_13_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41929\u2010024\u201001241\u20101"},{"key":"e_1_2_8_14_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41929\u2010017\u20100017\u2010x"},{"key":"e_1_2_8_15_1","doi-asserted-by":"publisher","DOI":"10.1021\/acs.chemrev.2c00515"},{"key":"e_1_2_8_16_1","doi-asserted-by":"publisher","DOI":"10.1002\/smll.202303428"},{"key":"e_1_2_8_17_1","doi-asserted-by":"crossref","first-page":"6072","DOI":"10.1038\/s41467-022-33757-0","article-title":"Layered Pd Oxide on PdSn Nanowires for Boosting Direct H2O2 Synthesis","volume":"13","author":"Li H. 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