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<article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" article-type="research-article" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Russian Journal of Physical Chemistry A</journal-id><journal-title-group><journal-title xml:lang="en">Russian Journal of Physical Chemistry A</journal-title><trans-title-group xml:lang="ru"><trans-title>Журнал физической химии</trans-title></trans-title-group></journal-title-group><issn publication-format="print">0044-4537</issn><issn publication-format="electronic">3034-5537</issn><publisher><publisher-name xml:lang="en">The Russian Academy of Sciences</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">685284</article-id><article-id pub-id-type="doi">10.31857/S0044453725020205</article-id><article-id pub-id-type="edn">DCWCKT</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>ELECTROCHEMISTRY. GENERATION AND STORAGE OF ENERGY  FROM RENEWABLE SOURCES</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>ЭЛЕКТРОХИМИЯ. ГЕНЕРАЦИЯ И АККУМУЛИРОВАНИЕ ЭНЕРГИИ ИЗ ВОЗОБНОВЛЯЕМЫХ ИСТОЧНИКОВ</subject></subj-group><subj-group subj-group-type="article-type"><subject>Research Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">Comparison of the catalytic properties of Pt and Co cathodes for the nitrite reduction reaction to ammonia</article-title><trans-title-group xml:lang="ru"><trans-title>Сравнение каталитических свойств Pt- и Co-катодов в реакции восстановления нитритов до аммиака</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Kuznetsova</surname><given-names>I. I.</given-names></name><name xml:lang="ru"><surname>Кузнецова</surname><given-names>И. И.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Department of Chemistry</p></bio><bio xml:lang="ru"><p>Химический факультет</p></bio><email>lmkustov@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Lebedeva</surname><given-names>O. K.</given-names></name><name xml:lang="ru"><surname>Лебедева</surname><given-names>О. К.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Department of Chemistry</p></bio><bio xml:lang="ru"><p>Химический факультет</p></bio><email>lmkustov@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Kultin</surname><given-names>D. Y.</given-names></name><name xml:lang="ru"><surname>Культин</surname><given-names>Д. Ю.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Department of Chemistry</p></bio><bio xml:lang="ru"><p>Химический факультет</p></bio><email>lmkustov@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Kustov</surname><given-names>L. M.</given-names></name><name xml:lang="ru"><surname>Кустов</surname><given-names>Л. М.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>M. V. Lomonosov Moscow State University, Department of Chemistry</p></bio><bio xml:lang="ru"><p>Московский государственный университет им. М. В. Ломоносова, Химический факультет</p></bio><email>lmkustov@mail.ru</email><xref ref-type="aff" rid="aff1"/><xref ref-type="aff" rid="aff2"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">M. V. Lomonosov Moscow State University</institution></aff><aff><institution xml:lang="ru">Московский государственный университет им. М. В. Ломоносова</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences</institution></aff><aff><institution xml:lang="ru">Институт органической химии им. Н. Д. Зелинского Российской академии наук</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2025-02-15" publication-format="electronic"><day>15</day><month>02</month><year>2025</year></pub-date><volume>99</volume><issue>2</issue><fpage>331</fpage><lpage>338</lpage><history><date date-type="received" iso-8601-date="2025-06-19"><day>19</day><month>06</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2025, Russian Academy of Sciences</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2025, Российская академия наук</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="en">Russian Academy of Sciences</copyright-holder><copyright-holder xml:lang="ru">Российская академия наук</copyright-holder></permissions><self-uri xlink:href="https://journals.eco-vector.com/0044-4537/article/view/685284">https://journals.eco-vector.com/0044-4537/article/view/685284</self-uri><abstract xml:lang="en"><p>The electrochemical reaction reduction of nitrites (NO<sub>2</sub>−RR) in a neutral aqueous electrolyte is studied, which has important applications both for future ammonia synthesis processes and for effective wastewater and agricultural wastewater treatment. The catalytic activity is compared (the results of the Faradaic efficiency and the yield rate of ammonia are obtained) for noble (platinum) and non-noble (cobalt) metals. Metallic polycrystalline platinum and cobalt serve as electrocatalyst. The surface of the catalysts is analyzed using SEM and light microscopy. The method of linear voltammetry is used to preliminarily identify the potential of ammonia synthesis and estimate the synthesis current density. The values of Faradaic efficiency (FE) and the yield rate of ammonia release are obtained for the five selected values of current densities (J). It is found that the cobalt cathode is more efficient (FE ≈ 99%, yield rate (NH<sub>3</sub>) = 2.4 mmol h<sup>–1</sup> cm<sup>–2</sup>), which exceeds the values for the platinum cathode ((FE = 88.1%, yield rate (NH<sub>3</sub>) = 0.4 mmol h<sup>–1</sup> cm<sup>–2</sup>). The electrochemically active surface (ECSA) of the electrocatalysts is determined. The explanation of such activity of catalysts is given according to the results of the work that demonstrate that a non-noble metal cathode can be more effective for NO<sub>2</sub>−RR.</p></abstract><trans-abstract xml:lang="ru"><p>Исследована электрохимическая реакция восстановления нитритов (NO<sub>2</sub>–RR) в нейтральном водном электролите, имеющая важное применение, как для будущих процессов синтеза аммиака, так и для эффективной очистки сточных и сельскохозяйственных сбросов. Проведено сравнение каталитической активности (получены результаты выхода по току (Фарадеевской эффективности) и скорости образования аммиака) для благородного (платина) и неблагородного (кобальт) металлов. Электродами-катализаторами служили металлические поликристаллические платина и кобальт. Поверхность катализаторов была проанализирована при помощи сканирующей и оптической микроскопии. Метод потенциодинамических кривых служил для предварительного выявления потенциала синтеза аммиака и оценки плотности тока синтеза. Были получены значения выхода по току (Фарадеевская эффективность, FE) и скорость образования аммиака при выбранных пяти значениях плотностей тока. Было обнаружено, что более эффективным является кобальтовый катод (FE ≈ 99%, скорость образования (NH<sub>3</sub>) = 2.4 мкмоль ч<sup>–1</sup> см<sup>–2</sup>), что превышает значения для платинового катода (FE = 88.1%, скорость образования (NH<sub>3</sub>) = 0.4 мкмоль ч<sup>–1</sup> см<sup>–2</sup>). Была определена электрохимически активная поверхность рабочих электродов-катализаторов. Объяснение такой активности катализаторов дано согласно результатам работы, которые демонстрируют, что катод из неблагородного металла может быть более эффективным для NO<sub>2</sub>–RR, чем платиновый катод.</p></trans-abstract><kwd-group xml:lang="en"><kwd>electrocatalysis</kwd><kwd>nitrite reduction reaction</kwd><kwd>platinum catalyst</kwd><kwd>cobalt catalyst</kwd><kwd>green chemistry</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>электрокатализ</kwd><kwd>восстановление нитритов</kwd><kwd>платиновый катализатор</kwd><kwd>кобальтовый катализатор</kwd><kwd>экологическая химия</kwd></kwd-group><funding-group><award-group><funding-source><institution-wrap><institution xml:lang="ru">Российский научный фонд</institution></institution-wrap><institution-wrap><institution xml:lang="en">Russian Science Foundation</institution></institution-wrap></funding-source><award-id>23-73-30007</award-id></award-group><award-group><funding-source><institution-wrap><institution xml:lang="ru">Правительство РФ</institution></institution-wrap><institution-wrap><institution xml:lang="en">Government of RF</institution></institution-wrap></funding-source></award-group></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Makepeace J.W., He T., Weidenthaler C. et al. // Int. 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