10.1002\/adma.202401648<\/a><\/p>\nAuthors:<\/h4>\n
Ashwani Kumar, Marcos Gil\u2010Sepulcre, Jinsun Lee, Viet Q. Bui, Yue Wang, Olaf R\u00fcdiger, Min Gyu Kim, Serena DeBeer, Harun T\u00fcys\u00fcz<\/p>\n
Abstract:<\/h4>\n
Exploring single-atom-catalysts for the acidic oxygen evolution reaction (OER) is of paramount importance for cost-effective hydrogen production via acidic water electrolyzers. However, the limited durability of most single-atom-catalysts and Ir\/Ru-based oxides under harsh acidic OER conditions, primarily attributed to excessive lattice oxygen participation resulting in metal-leaching and structural collapse, hinders their practical application. Herein, an innovative strategy is developed to fabricate short-range Ir single-atom-ensembles (IrSAE<\/sub>) stabilized on the surface of Mn-substituted spinel Co3<\/sub>O4<\/sub> (IrSAE<\/sub>-CMO), which exhibits excellent mass activity and significantly improved durability (degradation-rate: \u22482 mV h-1<\/sup>), outperforming benchmark IrO2<\/sub> (\u224844 mV h-1<\/sup>) and conventional Irsingle-atoms<\/sub> on pristine-Co3<\/sub>O4<\/sub> for acidic OER. First-principle calculations reveal that Mn-substitution in the octahedral sites of Co3<\/sub>O4<\/sub> substantially reduces the migration energy barrier for Irsingle-atoms<\/sub> on the CMO surface compared to pristine-Co3<\/sub>O4<\/sub>, facilitating the migration of Irsingle-atoms<\/sub> to form strongly correlated IrSAE<\/sub> during pyrolysis. Extensive ex situ characterization, operando X-ray absorption and Raman spectroscopies, pH-dependence activity tests, and theoretical calculations indicate that the rigid IrSAE<\/sub> with appropriate Ir-Ir distance stabilized on the CMO surface effectively suppresses lattice oxygen participation while promoting direct O\u2500O radical coupling, thereby mitigating Ir-dissolution and structural collapse, boosting the stability in an acidic environment.<\/p>\n","protected":false},"excerpt":{"rendered":"DOI: 10.1002\/adma.202401648 Authors: Ashwani Kumar, Marcos Gil\u2010Sepulcre, Jinsun Lee, Viet Q. Bui, Yue Wang, Olaf R\u00fcdiger, Min Gyu Kim, Serena DeBeer, Harun T\u00fcys\u00fcz Abstract: Exploring single-atom-catalysts for the acidic oxygen evolution reaction (OER) is of paramount importance for cost-effective hydrogen production via acidic water electrolyzers. However, the limited durability of most single-atom-catalysts and Ir\/Ru-based oxides […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[27],"tags":[],"class_list":["post-198","post","type-post","status-publish","format-standard","hentry","category-sp-300-potentiostat"],"_links":{"self":[{"href":"https:\/\/citations.tools.bio-logic.fr\/index.php?rest_route=\/wp\/v2\/posts\/198","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/citations.tools.bio-logic.fr\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/citations.tools.bio-logic.fr\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/citations.tools.bio-logic.fr\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/citations.tools.bio-logic.fr\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=198"}],"version-history":[{"count":0,"href":"https:\/\/citations.tools.bio-logic.fr\/index.php?rest_route=\/wp\/v2\/posts\/198\/revisions"}],"wp:attachment":[{"href":"https:\/\/citations.tools.bio-logic.fr\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=198"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/citations.tools.bio-logic.fr\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=198"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/citations.tools.bio-logic.fr\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=198"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}