{"id":422,"date":"2026-04-15T13:55:03","date_gmt":"2026-04-15T13:55:03","guid":{"rendered":"https:\/\/citations.tools.bio-logic.fr\/?p=422"},"modified":"2026-04-15T13:55:03","modified_gmt":"2026-04-15T13:55:03","slug":"high-crystallinity-design-of-ir-based-catalysts-drives-catalytic-reversibility-for-water-electrolysis-and-fuel-cells","status":"publish","type":"post","link":"https:\/\/citations.tools.bio-logic.fr\/?p=422","title":{"rendered":"High crystallinity design of Ir-based catalysts drives catalytic reversibility for water electrolysis and fuel cells"},"content":{"rendered":"<h4>DOI:<\/h4>\n<p><a href=\"https:\/\/doi.org\/10.1038\/s41467-021-24578-8\" target=\"_blank\" rel=\"noopener\">10.1038\/s41467-021-24578-8<\/a><\/p>\n<h4>Authors:<\/h4>\n<p>Woong Hee Lee, Young\u2010Jin Ko, Jung Hwan Kim, Chang Hyuck Choi, Keun Hwa Chae, Hansung Kim, Yun Jeong Hwang, Byoung Koun Min, Peter Strasser, Hyung\u2010Suk Oh<\/p>\n<h4>Abstract:<\/h4>\n<p>The voltage reversal of water electrolyzers and fuel cells induces a large positive potential on the hydrogen electrodes, followed by severe system degradation. Applying a reversible multifunctional electrocatalyst to the hydrogen electrode is a practical solution. Ir exhibits excellent catalytic activity for hydrogen evolution reactions (HER), and hydrogen oxidation reactions (HOR), yet irreversibly converts to amorphous IrO<sub>x<\/sub> at potentials &gt; 0.8 V\/RHE, which is an excellent catalyst for oxygen evolution reactions (OER), yet a poor HER and HOR catalyst. Harnessing the multifunctional catalytic characteristics of Ir, here we design a unique Ir-based electrocatalyst with high crystallinity for OER, HER, and HOR. Under OER operation, the crystalline nanoparticle generates an atomically-thin IrO<sub>x<\/sub> layer, which reversibly transforms into a metallic Ir at more cathodic potentials, restoring high activity for HER and HOR. Our analysis reveals that a metallic Ir subsurface under thin IrO<sub>x<\/sub> layer can act as a catalytic substrate for the reduction of Ir ions, creating reversibility. Our work not only uncovers fundamental, uniquely reversible catalytic properties of nanoparticle catalysts, but also offers insights into nanocatalyst design.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>DOI: 10.1038\/s41467-021-24578-8 Authors: Woong Hee Lee, Young\u2010Jin Ko, Jung Hwan Kim, Chang Hyuck Choi, Keun Hwa Chae, Hansung Kim, Yun Jeong Hwang, Byoung Koun Min, Peter Strasser, Hyung\u2010Suk Oh Abstract: The voltage reversal of water electrolyzers and fuel cells induces a large positive potential on the hydrogen electrodes, followed by severe system degradation. Applying a [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[],"class_list":["post-422","post","type-post","status-publish","format-standard","hentry","category-blurev-rde-rrde"],"_links":{"self":[{"href":"https:\/\/citations.tools.bio-logic.fr\/index.php?rest_route=\/wp\/v2\/posts\/422","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=422"}],"version-history":[{"count":0,"href":"https:\/\/citations.tools.bio-logic.fr\/index.php?rest_route=\/wp\/v2\/posts\/422\/revisions"}],"wp:attachment":[{"href":"https:\/\/citations.tools.bio-logic.fr\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=422"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/citations.tools.bio-logic.fr\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=422"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/citations.tools.bio-logic.fr\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=422"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}