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Herein, the electrochemical activity of single AuNPs attached to the catalytically inert carbon surface is mapped by using extremely small (\u22653\u2005nm radius) polished nanoelectrodes as tips in the scanning electrochemical microscope (SECM). The use of such small probes resulted in the spatial resolution significantly higher than in previously reported electrochemical images. The currents produced by either rapid electron transfer or the electrocatalytic hydrogen evolution reaction at a single 10 or 20\u2005nm NP were measured and quantitatively analyzed. The developed methodology should be useful for studying the effects of nanoparticle size, geometry, and surface attachment on electrocatalytic activity in real\u2010world application environment.<\/jats:p>","DOI":"10.1002\/anie.201408408","type":"journal-article","created":{"date-parts":[[2014,10,21]],"date-time":"2014-10-21T05:45:03Z","timestamp":1413870303000},"page":"14120-14123","source":"Crossref","is-referenced-by-count":185,"title":["Scanning Electrochemical Microscopy of Individual Catalytic Nanoparticles"],"prefix":"10.1002","volume":"53","author":[{"given":"Tong","family":"Sun","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yun","family":"Yu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Brian J.","family":"Zacher","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Michael 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