najoNanosystems: Physics, Chemistry, MathematicsНаносистемы: физика, химия, математика2220-80542305-7971Университет ИТМО10.17586/2220-8054-2023-14-5-590-600najo-297Research ArticleCHEMISTRY AND MATERIALS SCIENCEХИМИЯ И НАУКА О МАТЕРИАЛАХEvaluation of the electrochemical active surface area for carbon felt and nanostructured Ni coatings as electrocatalysts for hydrogen evolution reactionОценка площади электрохимически активной поверхности углеродного войлока и наноструктурированных никелевых покрытий в качестве электрокатализаторов реакции выделения водородаhttps://orcid.org/0000-0002-7261-6694ДмитриевД. С.DmitrievD. S.

Dmitry S. Dmitriev

194021 Saint Petersburg, 26 Polytechnicheskaya street

elchemorg@gmail.comhttps://orcid.org/0000-0003-2003-0672ТеневичМ. И.TenevichM. I.

Maksim I. Tenevich

194021 Saint Petersburg, 26 Polytechnicheskaya street

chwm420@gmail.comIoffe InstituteRussian Federation202308062025145590600Copyright © Dmitriev D.S., Tenevich M.I., 20252025Дмитриев Д.С., Теневич М.И.Dmitriev D.S., Tenevich M.I.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/297

This study is devoted to the evaluation of electrochemical active surface area (ECSA) for carbon felt used in various fields of electrochemical technology. For the evaluation, we used techniques based on Faraday’s law, the Randles–Sevcik equation and the calculation of the electric double layer capacitance in the electrolyte with different pH value. The measurement results are consistent with each other and for neutral, acidic and alkaline medium, the ECSA value are 20 – 30, 30 – 40 and 50 – 90 cm2 per 1 cm2 of geometric surface, respectively. Based on the results, the synthesis of nanostructured nickel coatings on carbon felt with prior electrochemical activation was performed. The pre-treatment in 1M KOH vs 1 M Na2SO4 reduces the crystallite size from 26 to 15 nm and increases the ECSA from 133 to 700 cm2 per 1 cm2 of geometric surface. These changes cause an improvement in other electrocatalytic features for hydrogen evolution reaction.

Данное исследование посвящено оценке площади электрохимически активной поверхности (ECSA) углеродного войлока, используемого в различных областях электрохимической технологии. Для оценки использовались методы, основанные на законе Фарадея, уравнении Рэндлса-Шевчика и расчете электрической емкости двойного слоя в электролите с различным значением рН. Результаты измерений согласуются друг с другом, и для нейтральной, кислой и щелочной сред значения ECSA составляют 20-30, 30-40 и 50-90 см2 на 1 см2 геометрической поверхности соответственно. На основании полученных результатов был проведен синтез наноструктурированных никелевых покрытий на углеродном войлоке с предварительной электрохимической активацией. Предварительная обработка в 1М КОН в отличии от 1М Na2SO4 уменьшает размер кристаллитов с 26 до 15 нм и увеличивает ECSA с 133 до 700 см2 на 1 см2 геометрической поверхности. Эти изменения приводят к улучшению других электрокаталитических характеристик реакции выделения водорода.

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