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By taking nitrous acid photoreduction as an example, this study has shown that the reaction pathway, and hence the reaction products, dynamically respond to variations in light intensity. Under irradiation, the photooxidation of methanol (as sacrificial agent) on TiO<jats:sub>2<\/jats:sub> and the reduction of HNO<jats:sub>2<\/jats:sub> on a Cu\u2010modified covalent triazine framework (Cu\u2010CTF) are electrically coupled, which leads to the photoreduction of HNO<jats:sub>2<\/jats:sub> without an external bias. The major product of the reaction changes from N<jats:sub>2<\/jats:sub>O to NH<jats:sub>4<\/jats:sub><jats:sup>+<\/jats:sup> with an increase in the light intensity. The operating potential also shifts negatively (or positively) when the light intensity is increased (or decreased). These results indicate that a change in the reaction pathway is triggered by a change in the operating potential of the Cu\u2010CTF catalyst under varying light intensity. Such a light\u2010intensity\u2010dependent change in the reaction pathway is particularly important in systems that use photoresponsive electrodes and where multiple products can be obtained, such as the solar\u2010driven reduction of carbon dioxide and nitrogen oxides.<\/jats:p>","DOI":"10.1002\/cssc.202000687","type":"journal-article","created":{"date-parts":[[2020,4,27]],"date-time":"2020-04-27T05:30:05Z","timestamp":1587965405000},"page":"3462-3468","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":20,"title":["Light\u2010Intensity\u2010Responsive Changes of Products in Photocatalytic Reduction of Nitrous Acid on a Cu\u2010Doped Covalent Triazine Framework\u2013TiO<sub>2<\/sub> Hybrid"],"prefix":"10.1002","volume":"13","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6018-9277","authenticated-orcid":false,"given":"Kazuhide","family":"Kamiya","sequence":"first","affiliation":[{"name":"Graduate School of Engineering Science 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