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However, the mildly acidic pH and limited H\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>2<\/jats:sub>\n                    levels in the tumor microenvironment (TME) restrict the activity of the Fenton reaction, severely limiting the therapeutic efficacy of CDT. Here, we construct a multifunctional nanoreactor, Fe\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>3<\/jats:sub>\n                    @MoS\n                    <jats:sub>2<\/jats:sub>\n                    \u2010Pt\/FA, which combines catalyst surface engineering with intracellular metabolic regulation to achieve highly efficient synergy between CDT and chemotherapy. This nanoreactor constructs a localized acidic microenvironment by bonding MoS\n                    <jats:sub>2<\/jats:sub>\n                    onto the surface of Fe\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>3<\/jats:sub>\n                    , enabling the Fenton catalyst to maintain high catalytic activity under mildly acidic conditions and thereby overcoming the environmental pH limitation. Meanwhile, the introduction of cisplatin precursors containing disulfide bonds enabled glutathione\u2010responsive release. Cisplatin not only exerts its chemotherapeutic effects but also promotes intracellular H\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>2<\/jats:sub>\n                    production by activating relevant pathways, providing more abundant substrates for CDT. Through these synergistic multimodal mechanisms, this nanoreactor induces tumor cell apoptosis by causing DNA damage, disrupting cellular redox homeostasis, and impairing mitochondrial and nuclear functions. This study provides an effective nanoplatform design strategy to overcome the limitations of TME pH and H\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>2<\/jats:sub>\n                    insufficiency in CDT.\n                  <\/jats:p>","DOI":"10.1002\/smll.75881","type":"journal-article","created":{"date-parts":[[2026,9,29]],"date-time":"2026-09-29T13:00:26Z","timestamp":1790686826000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Multifunctional Nanoreactor Based on Catalyst Surface Engineering Combines pH\u2010Adaptive Catalysis With Tumor Microenvironment Modulation for Synergistic Chemodynamic\u2010Chemotherapy"],"prefix":"10.1002","author":[{"given":"Yuchen","family":"Liu","sequence":"first","affiliation":[{"name":"Institute of Smart Biomedical Materials School of Materials Science and Engineering Zhejiang Sci\u2010Tech University  Hangzhou 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