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In this work, a new series of BaSc\n                    <jats:sub>1\u2212<\/jats:sub>\n                    <jats:italic>\n                      <jats:sub>x<\/jats:sub>\n                    <\/jats:italic>\n                    <jats:sub>\u2212<\/jats:sub>\n                    <jats:italic>\n                      <jats:sub>y<\/jats:sub>\n                    <\/jats:italic>\n                    Mo\n                    <jats:italic>\n                      <jats:sub>x<\/jats:sub>\n                    <\/jats:italic>\n                    W\n                    <jats:italic>\n                      <jats:sub>y<\/jats:sub>\n                    <\/jats:italic>\n                    O\n                    <jats:sub>3\u2212<\/jats:sub>\n                    <jats:italic>\n                      <jats:sub>\u03b4<\/jats:sub>\n                    <\/jats:italic>\n                    compounds was prepared via Mo\/W donor co\u2010doping where\n                    <jats:italic>x<\/jats:italic>\n                    is the Mo content,\n                    <jats:italic>y<\/jats:italic>\n                    is the W content, and\n                    <jats:italic>\u03b4<\/jats:italic>\n                    is the amount of oxygen vacancies. The present work reports the enhancement of proton conductivity by the Mo\/W donor co\u2010doping of BaScO\n                    <jats:sub>2.5<\/jats:sub>\n                    . BaSc\n                    <jats:sub>0.8<\/jats:sub>\n                    Mo\n                    <jats:sub>0.1<\/jats:sub>\n                    W\n                    <jats:sub>0.1<\/jats:sub>\n                    O\n                    <jats:sub>2.8<\/jats:sub>\n                    exhibits exceptional proton conductivity\u20140.10\u00a0S cm\n                    <jats:sup>\u2212<\/jats:sup>\n                    <jats:sup>1<\/jats:sup>\n                    at 315\u00a0\u00b0C and 0.01\u00a0S cm\n                    <jats:sup>\u2212<\/jats:sup>\n                    <jats:sup>1<\/jats:sup>\n                    at 193\u00a0\u00b0C\u2014alongside outstanding chemical stability in CO\n                    <jats:sub>2<\/jats:sub>\n                    , O\n                    <jats:sub>2<\/jats:sub>\n                    , and H\n                    <jats:sub>2<\/jats:sub>\n                    atmospheres. The high proton conductivity originates from the synergistic effects of abundant oxygen vacancies (\n                    <jats:italic>\u03b4<\/jats:italic>\n                    \u00a0=\u00a00.2) and full hydration, yielding a high proton concentration, coupled with high proton diffusivity. The high diffusivity is attributable to the reduced proton trapping compared with acceptor and isovalent doping and overdoping due to higher proton concentration. In contrast to the acceptor co\u2010doping, the donor co\u2010doping does not increase the activation energy, resulting in lower activation energy and higher proton conductivity. These findings establish donor co\u2010doping into the oxygen\u2010deficient perovskites as a powerful design principle for next\u2010generation proton conductors with high proton conductivity at intermediate temperatures.\n                  <\/jats:p>","DOI":"10.1002\/anie.202521773","type":"journal-article","created":{"date-parts":[[2026,1,20]],"date-time":"2026-01-20T06:02:36Z","timestamp":1768888956000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["Superprotonic Conduction in Donor Co\u2010Doped Perovskites"],"prefix":"10.1002","volume":"65","author":[{"given":"Kensei","family":"Umeda","sequence":"first","affiliation":[{"name":"Department of Chemistry School of Science Institute of Science Tokyo  2\u201012\u20101\u2010W4\u201017, O\u2010okayama Meguro\u2010ku Tokyo 152\u20108551 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