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Here, an in situ hydrothermal transformation method for synthesizing ultra\u2010porous cobalt\u2010nickel silicate hydroxide (CNSH) with a layered double hydroxide (LDH) is demonstrated. This in situ variation from well\u2010crystallized carbonate to amorphous silicate hydroxide leads to a dandelion\u2010like structure originating from framework reconstruction as topotactic transformation process, defined as \u201ckarst cave effect\u201d. Moreover, the specific coordination environment in CNSH not only enhances Metal\u2010Oxygen Covalency (MOC) for promoting lattice oxygen\u2010mediated mechanism (LOM), but also improves structural stability. CNSH demonstrates superior OER performance, including low overpotentials of 275\u00a0mV and 313\u00a0mV for current densities of 10 and 100\u00a0mA cm\n                    <jats:sup>\u22122<\/jats:sup>\n                    , respectively, as well as exceptional long\u2010term stability for 800 h at 1 A cm\n                    <jats:sup>\u22122<\/jats:sup>\n                    . This work provides an innovative and feasible pathway for the rational design of electrocatalysts with both porous structure and rapid kinetics for efficient and stable water oxidation.\n                  <\/jats:p>","DOI":"10.1002\/smll.75318","type":"journal-article","created":{"date-parts":[[2026,8,21]],"date-time":"2026-08-21T10:32:19Z","timestamp":1787308339000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Karst Cave EffectInduced Dandelion\u2010Like Porous Cobalt\u2013Nickel Silicate Hydroxide: Enhanced Oxygen Evolution Reaction Performance via LOM Mechanism"],"prefix":"10.1002","volume":"22","author":[{"given":"Hongxin","family":"Zhao","sequence":"first","affiliation":[{"name":"School of Chemistry Dalian University of Technology  Dalian People's Republic of China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yang","family":"Wang","sequence":"additional","affiliation":[{"name":"School of 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