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The structurally and electronically beneficial properties of the tetragonal CoSn<jats:sub>2<\/jats:sub> exhibit a considerably low overpotential for the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) on fluorine\u2010doped tin oxide (FTO) and Ni foam (NF). Loss of Sn from the crystal lattices and oxidation of Co under strongly alkaline conditions furnishes highly disordered amorphous active CoO<jats:sub><jats:italic>x<\/jats:italic><\/jats:sub>(H), the catalytically active structure for OER. The Co<jats:sup>0<\/jats:sup> atoms in the CoSn<jats:sub>2<\/jats:sub> act as active sites for HER and the presence of Sn provides efficient electrical conductivity. This intermetallic phase is a novel type of cost\u2010effective and competitive bifunctional electrocatalysts and predestinated for overall water\u2010splitting devices: A two\u2010electrode electrolyzer with CoSn<jats:sub>2<\/jats:sub> on NF delivers a cell voltage of merely 1.55\u2005V at 10\u2005mA\u2009cm<jats:sup>\u22122<\/jats:sup> maintaining long\u2010term stability.<\/jats:p>","DOI":"10.1002\/anie.201809787","type":"journal-article","created":{"date-parts":[[2018,9,24]],"date-time":"2018-09-24T17:13:32Z","timestamp":1537809212000},"page":"15237-15242","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":129,"title":["Structurally Ordered Intermetallic Cobalt Stannide Nanocrystals for High\u2010Performance Electrocatalytic Overall Water\u2010Splitting"],"prefix":"10.1002","volume":"57","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0665-7690","authenticated-orcid":false,"given":"Prashanth W.","family":"Menezes","sequence":"first","affiliation":[{"name":"Department of Chemistry: Metalorganics and Inorganic Materials Technische Universit\u00e4t Berlin  Stra\u00dfe des 17 Juni 135, Sekr. 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