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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">Kinetics and Catalysis</journal-id><journal-title-group><journal-title xml:lang="en">Kinetics and Catalysis</journal-title><trans-title-group xml:lang="ru"><trans-title>Кинетика и катализ</trans-title></trans-title-group></journal-title-group><issn publication-format="print">0453-8811</issn><issn publication-format="electronic">3034-5413</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">689885</article-id><article-id pub-id-type="doi">10.31857/S0453881125020049</article-id><article-id pub-id-type="edn">SKQGBE</article-id><article-categories><subj-group subj-group-type="toc-heading"><subject>VIII Международная научная школа-конференция молодых ученых “Катализ: от науки к промышленности” (30 сентября–3 октября 2024 г., Томск)</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">Effect of modification method of TiO<sub>2</sub> nanotubes with Cu<sub>2</sub>O on their activity in photoelectrochemical water splitting</article-title><trans-title-group xml:lang="ru"><trans-title>Влияние способа модификации TiO<sub>2</sub> нанотрубок наночастицами Cu<sub>2</sub>O на их активность в реакции фотоэлектрохимического разложения воды</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Zos’ko</surname><given-names>N. A.</given-names></name><name xml:lang="ru"><surname>Зосько</surname><given-names>Н. А.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>rtkm.1@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Aleksandrovsky</surname><given-names>A. S.</given-names></name><name xml:lang="ru"><surname>Александровский</surname><given-names>А. С.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>rtkm.1@mail.ru</email><xref ref-type="aff" rid="aff2"/><xref ref-type="aff" rid="aff3"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Kenova</surname><given-names>T. A.</given-names></name><name xml:lang="ru"><surname>Кенова</surname><given-names>Т. А.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>kta@icct.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Gerasimova</surname><given-names>M. A.</given-names></name><name xml:lang="ru"><surname>Герасимова</surname><given-names>М. А.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>rtkm.1@mail.ru</email><xref ref-type="aff" rid="aff3"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Maksimov</surname><given-names>N. G.</given-names></name><name xml:lang="ru"><surname>Максимов</surname><given-names>Н. Г.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>rtkm.1@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Zhizhaev</surname><given-names>A. M.</given-names></name><name xml:lang="ru"><surname>Жижаев</surname><given-names>А. М.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>rtkm.1@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Taran</surname><given-names>O. P.</given-names></name><name xml:lang="ru"><surname>Таран</surname><given-names>О. П.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>rtkm.1@mail.ru</email><xref ref-type="aff" rid="aff1"/><xref ref-type="aff" rid="aff3"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Institute of Chemistry and Chemical Technology, FRC KSC SB RAS</institution></aff><aff><institution xml:lang="ru">Институт химии и химической технологии ФИЦ КНЦ СО РАН</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">L.V. Kirensky Institute of Physics, FRC KSC SB RAS</institution></aff><aff><institution xml:lang="ru">Институт физики им. Л.В. Киренского ФИЦ КНЦ СО РАН</institution></aff></aff-alternatives><aff-alternatives id="aff3"><aff><institution xml:lang="en">Siberian Federal University</institution></aff><aff><institution xml:lang="ru">Сибирский федеральный университет</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2025-09-04" publication-format="electronic"><day>04</day><month>09</month><year>2025</year></pub-date><volume>66</volume><issue>2</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>104</fpage><lpage>115</lpage><history><date date-type="received" iso-8601-date="2025-08-26"><day>26</day><month>08</month><year>2025</year></date><date date-type="accepted" iso-8601-date="2025-08-26"><day>26</day><month>08</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://ruspoj.com/0453-8811/article/view/689885">https://ruspoj.com/0453-8811/article/view/689885</self-uri><abstract xml:lang="en"><p>TiO<sub>2</sub> nanotube array electrodes for the photoelectrochemical process of water splitting were modified with Cu<sub>2</sub>O, <italic>p</italic>-type semiconductor (<italic>p</italic>-Cu<sub>2</sub>O). By employing the cyclic voltammetry (CV) method to deposit <italic>p</italic>-Cu<sub>2</sub>O nanoparticles, a more uniform particle distribution was achieved over the inner and outer surfaces of TiO<sub>2</sub> nanotubes. The measurements of incident photon-to-current conversion efficiency (IPCE) in the range of 365-660 nm demonstrated that the proposed method significantly enhance photoactivity in the visible light region compared to the potentiostatic deposition method. The IPCE value was 0.18% at a wavelength of 523 nm, which was 7 and 45 times higher than for the potentiostatic modified and pristine samples, respectively. Under continuous illumination with visible light at a wavelength of 523 nm and a potential of 0.2 V (Ag/AgCl (sat.)), the transition from Cu<sub>2</sub>O to CuO was observed for 5 hours, accompanied by a decrease in photocurrent density.</p></abstract><trans-abstract xml:lang="ru"><p>Получены электроды на основе массивов нанотрубок TiO<sub>2</sub>, модифицированных Cu<sub>2</sub>O, полупроводником<italic> p</italic>-типа (<italic>p</italic>-Cu<sub>2</sub>O), для процесса фотоэлектрохимического разложения воды. Предложено использовать метод циклической вольтамперометрии (ЦВА) для осаждения наночастиц <italic>p</italic>-Cu<sub>2</sub>O, что позволяет добиться более равномерного распределения частиц по внутренней и внешней поверхности нанотрубок TiO<sub>2</sub>. Измерения эффективности преобразования фотонов в ток (IPCE) в области 365–660 нм показали, что предложенный метод существенно увеличивает фотоактивность в области видимого света по сравнению с известным методом потенциостатического осаждения. Величина IPCE составила 0.18% при длине волны 523 нм, что в 7 и 45 раз выше, чем для потенциостатически модифицированного и исходного образцов соответственно. В условиях постоянного облучения видимым светом с длиной волны 523 нм при потенциале 0.2 В (Ag/AgCl<sub>(нас.)</sub>) в течение 5 ч наблюдается переход Cu<sub>2</sub>O в CuO, что сопровождается снижением плотности фототока.</p></trans-abstract><kwd-group xml:lang="en"><kwd>photoelectrocatalytic activity</kwd><kwd>TiO2 nanotubes</kwd><kwd>р-Cu2O</kwd><kwd>p–n-heterojunction</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>фотоэлектрокаталитическая активность</kwd><kwd>нанотрубки TiO2</kwd><kwd>р-Cu2O</kwd><kwd>p–n-гетеропереход</kwd></kwd-group><funding-group><award-group><funding-source><institution-wrap><institution xml:lang="ru">Правительство Российской Федерации</institution></institution-wrap><institution-wrap><institution xml:lang="en">Government of the Russian Federation</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>Huang C.-W., Nguyen B.-S., Wu J.C.S., Nguyen V.-H. // Int. 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