Nanoceria Nanozyme 2D — Redox-Cycling Antioxidant Cross-Section

Cerium-oxide (CeO_2-x) nanoparticles carry oxygen vacancies that let surface cerium ions shuttle between Ce³⁺ and Ce⁴⁺, giving the particle both superoxide-dismutase-mimetic and catalase-mimetic catalytic activity — a self-regenerating "nanozyme". This 2D cross-section renders the equatorial ring of such a nanoparticle with a live population of Ce³⁺/Ce⁴⁺ surface sites: incoming superoxide radicals are neutralized by Ce³⁺ sites, which oxidize to Ce⁴⁺ and then regenerate after a catalase-mimetic turnover step, releasing O₂. Tune the particle's diameter (surface-to-volume ratio), the radical influx rate and the turnover time, and watch the Ce³⁺/Ce⁴⁺ ratio, scavenging rate and cumulative catalytic turnovers respond in real time. Drag the canvas to pan and scroll to zoom in on individual sites.