10.1038\/s41598-017-07259-9<\/a><\/p>\nAuthors:<\/h4>\n
Han-Saem Park, Eunyong Seo, Juchan Yang, Yeongdae Lee, Byeong\u2010Su Kim, Hyun\u2010Kon Song<\/p>\n
Abstract:<\/h4>\n
Ruthenium oxide (RuO2<\/sub>) is the best oxygen evolution reaction (OER) electrocatalyst. Herein, we demonstrated that RuO2<\/sub> can be also efficiently used as an oxygen reduction reaction (ORR) electrocatalyst, thereby serving as a bifunctional material for rechargeable Zn-air batteries. We found two forms of RuO2<\/sub> (i.e. hydrous and anhydrous, respectively h-RuO2<\/sub> and ah-RuO2<\/sub>) to show different ORR and OER electrocatalytic characteristics. Thus, h-RuO2<\/sub> required large ORR overpotentials, although it completed the ORR via a 4e process. In contrast, h-RuO2<\/sub> triggered the OER at lower overpotentials at the expense of showing very unstable electrocatalytic activity. To capitalize on the advantages of h-RuO2<\/sub> while improving its drawbacks, we designed a unique structure (RuO2<\/sub>@C) where h-RuO2<\/sub> nanoparticles were embedded in a carbon matrix. A double hydrophilic block copolymer-templated ruthenium precursor was transformed into RuO2<\/sub> nanoparticles upon formation of the carbon matrix via annealing. The carbon matrix allowed overcoming the limitations of h-RuO2<\/sub> by improving its poor conductivity and protecting the catalyst from dissolution during OER. The bifunctional RuO2<\/sub>@C catalyst demonstrated a very low potential gap (\u0394E OER-ORR<\/sub> = ca. 1.0 V) at 20 mA cm-2<\/sup>. The Zn||RuO2<\/sub>@C cell showed an excellent stability (i.e. no overpotential was observed after more than 40 h).<\/p>\n","protected":false},"excerpt":{"rendered":"DOI: 10.1038\/s41598-017-07259-9 Authors: Han-Saem Park, Eunyong Seo, Juchan Yang, Yeongdae Lee, Byeong\u2010Su Kim, Hyun\u2010Kon Song Abstract: Ruthenium oxide (RuO2) is the best oxygen evolution reaction (OER) electrocatalyst. Herein, we demonstrated that RuO2 can be also efficiently used as an oxygen reduction reaction (ORR) electrocatalyst, thereby serving as a bifunctional material for rechargeable Zn-air batteries. We […]<\/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-418","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\/418","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=418"}],"version-history":[{"count":0,"href":"https:\/\/citations.tools.bio-logic.fr\/index.php?rest_route=\/wp\/v2\/posts\/418\/revisions"}],"wp:attachment":[{"href":"https:\/\/citations.tools.bio-logic.fr\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=418"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/citations.tools.bio-logic.fr\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=418"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/citations.tools.bio-logic.fr\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=418"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}