▌Enabling highly selective H2O2 Electrosynthesis on graphene-based electrode by P-doped carbon nitride quantum dots for self-antibiofouling dissolved oxygen sensor via 2-electron oxygen reduction reaction
利用磷摻雜氮化碳量子點於石墨烯電極實現高選擇性 H2O2 電合成：基於二電子氧還原反應之自防汙溶氧感測器
Chen, Kung-Hsing, Mia Rinawati, Sofiannisa Aulia, Ling-Yu Chang, Yen-Shou Chiu, Chia-Yu Chang, Kuan-Jung Chen, Wei-Hsiang Huang, Wei-Nien Su, and Min-Hsin Yeh*
https://doi.org/10.1016/j.cej.2025.164999
SEED Member: Wei-Hsiang Huang, Wei-Nien Su, and Min-Hsin Yeh
Schematic of designing P-CNQDs/Gr for a self-antibiofouling dissolved oxygen sensor.
Major Contributions
1.P-doped carbon nitride quantum dots on graphene significantly enhance 2e⁻ ORR selectivity by strengthening O₂ adsorption and promoting OOH* formation, enabling efficient in-situ H₂O₂ generation (up to ~85% selectivity, FE ~74.6%).
2.The produced H₂O₂ provides strong self-antibiofouling capability by disrupting biofilm adhesion and inducing microbial apoptosis, ensuring reliable DO sensing in neutral aquatic environments.
3.The metal-free P-CNQDs/Gr sensor delivers high sensitivity (6.76 ± 0.75 μA cm⁻² ppm⁻¹) and excellent long-term durability, retaining ~80% of its signal after 48 h in real water samples, demonstrating strong potential for continuous DO monitoring in aquaculture and environmental applications.
主要貢獻
1.增強 2e⁻ ORR 選擇性與 H2O2 生成：負載於石墨烯上的磷摻雜氮化碳量子點（P-CNQDs）透過增強 O2 吸附並促進關鍵中間體 OOH* 的形成，顯著提升了二電子氧還原反應（2e⁻ ORR）的選擇性。這實現了高效的原位過氧化氫（H2O2）生成（選擇性高達 ~85%，法拉第效率 ~74.6%）。
2.自抗生物汙損（Self-antibiofouling）機制：原位生成的 H2O2 能破壞生物膜（biofilm）的附著並誘導微生物凋亡（apoptosis），從而提供強大的自抗生物汙損能力，確保感測器在中性水域環境中能進行可靠的溶氧（DO）感測。
3.高靈敏度與水產養殖應用潛力：這種無金屬（metal-free）的 P-CNQDs/Gr 感測器具備高靈敏度（ 6.76 ± 0.75 μA cm⁻² ppm⁻¹ ）與優異的長期耐用性（在真實水樣中 48 小時後仍保有 ~80% 訊號），在水產養殖與環境連續監測應用中展現強大潛力。
