najoNanosystems: Physics, Chemistry, MathematicsНаносистемы: физика, химия, математика2220-80542305-7971Университет ИТМО10.17586/2220-8054-2021-12-5-630-633najo-545Research ArticleCHEMISTRY AND MATERIAL SCIENCEХИМИЯ И МАТЕРИАЛОВЕДЕНИЕThe “rolling up” effect of platinum layer obtained on nickel surface by interaction with solution of H2PtCl6 and its electrocatalytic properties in hydrogen evolution reaction during water electrolysis in alkaline mediumЭффект «скатывания» платинового слоя, полученного на поверхности никеля при взаимодействии с раствором H2PtCl6, и его электрокаталитические свойства в реакции выделения водорода при электролизе воды в щелочной средеKanevaM. V.KanevaM. V.

26 University Prosp, St. Peterhof, Saint Petersburg, 198504

skt94@bk.ruTolstoyV. P.TolstoyV. P.

26 University Prosp, St. Peterhof, Saint Petersburg, 198504

v.tolstoy@spbu.ruInstitute of Chemistry, Saint Petersburg State UniversityRussian Federation202105082025125630633Copyright © Kaneva M.V., Tolstoy V.P., 20252025Kaneva M.V., Tolstoy V.P.Kaneva M.V., Tolstoy V.P.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://nanojournal.ifmo.ru/jour/article/view/545

We have shown for the first time that a platinum layer has been obtained on the surface of nickel foil as a result of Galvanic Replacement Reaction (GRR) when interacting with an aqueous solution of H2PtCl6, during drying in air, partially rolling up into incompletely formed microscrolls with a unique 3D morphology. Analysis of the wall of these microscrolls by FESEM, TEM, HR-TEM, and SAED methods showed that they are porous and formed by platinum nanocrystals with sizes of 5 – 10 nm, and their packing density over the wall thickness differs. Nickel foil samples with the layer of platinum microscrolls deposited on their surface exhibit high electrocatalytic activity in hydrogen evolution reaction (HER) during water electrolysis in the alkaline medium. In particular, the overpotential value is 32 mV and the Tafel slope is 32.5 mV/dec for an electrode with the platinum layer with a thickness of 120 – 140 nm.

Впервые показано, что слой платины получен на поверхности никелевой фольги в результате реакции гальванического замещения (ГРЗ) при взаимодействии с водным раствором H2PtCl6, при сушке на воздухе, частично свернут в неполностью сформированные микросвитки с уникальной трехмерной морфологией. Анализ стенки этих микросвитков методами FESEM, TEM, HR-TEM и SAED показал, что они пористые и образованы нанокристаллами платины размером 5‒10 нм, а плотность их упаковки по толщине стенки различается. Образцы никелевой фольги с нанесенным на их поверхность слоем микросвитков платины проявляют высокую электрокаталитическую активность в реакции выделения водорода (ВВР) при электролизе воды в щелочной среде. В частности, для электрода с платиновым слоем толщиной 120‒140 нм величина перенапряжения составляет 32 мВ, а тафелевская крутизна 32.5 мВ/дек.

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The authors declare that there are no conflicts of interest present.