▌Pioneering molecularly-level Fe sites immobilized on graphene quantum dots as a key activity descriptor in achieving highly efficient oxygen evolution reaction
石墨烯量子點作為固定分子級鐵活性位點之關鍵描述子以實現高效率析氧反應
M. Rinawati, L.Y. Chang, C.Y. Chang, C.C. Chang, D. Kurniawan, W.H. Chiang, W.N. Su, B. Yuliarto, W.H. Huang*, M.H. Yeh*
https://doi.org/10.1016/j.cej.2024.151436
SEED Member: W.N. Su、 M.H. Yeh
Major Contributions
1. Successfully developed a novel immobilization strategy for molecular Fe2+ ions on graphene quantum dots (GQDs) through a one-step hydrothermal process, achieving molecular-level dispersion and maintaining the Fe2+ oxidation state without forming oxide structures.
2. Demonstrated exceptional oxygen evolution reaction (OER) performance with the GQDs-Fe catalyst, achieving an ultra-low overpotential of 223 mV at 50 mA/cm2 current density and maintaining excellent stability over 24 hours.
3. Provided comprehensive mechanistic insights into the Fe2+ ion immobilization process and the resulting electronic structure through advanced characterization techniques (XAS, NEXAFS, XPS), confirming the molecular-level dispersion and the critical role of O-functional groups in anchoring Fe2+ ions.
主要貢獻
1. 成功開發了一種通過單步水熱法將分子級Fe2+離子固定在石墨烯量子點(GQDs)上的新型固定化策略，實現了分子級分散，並且在不形成氧化物結構的情況下保持了Fe2+的氧化態。
2. 展示了GQDs-Fe催化劑在析氧反應(OER)中的卓越性能，在50 mA/cm2電流密度下實現了223 mV的超低過電位，並保持了24小時的優異穩定性。
3. 通過先進的表徵技術(XAS、NEXAFS、XPS)，提供了Fe2+離子固定化過程及其產生的電子結構的全面機理洞察，證實了分子級分散以及含氧官能團在固定Fe2+離子中的關鍵作用。
