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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 46: Poster II

CPP 46.41: Poster

Donnerstag, 12. März 2026, 09:30–11:30, P5

Engineering MOF@MOF Heterojunction for Photocatalytic N2 Reduction to NH3 — •Maedeh Atoufi Kashani, Negin Khosroshahi, and Vahid Safarifard — Iran university of science and technology, Tehran, Iran

Photocatalytic nitrogen fixation is a promising green alternative to the Haber-Bosch process, but cobalt-based MOFs typically suffer from poor stability in water. Here, two Co-terephthalate frameworks were synthesized via solvothermal routes: MOF-71 from Co(NO3)3.6H2O and ultrathin Co-BDC nanosheets from CoCl2.6H2O in the presence of triethylamine, water, and ethanol. Both materials showed high phase purity and strong visible-light absorption. To improve the limited stability of Co-BDC, a Ce-based MOF overlayer was constructed on Co-BDC and MOF-71, forming a Ce-Co MOF-on-MOF composite. The Ce shell enhanced water stability, facilitated charge separation, and promoted N2 activation at the heterointerface. As a result, the Ce-Co-BDC composite delivered markedly higher ammonia production and durability than pristine Co-BDC. This work highlights the critical roles of precursor chemistry and Ce-Co interfacial engineering in developing robust MOF photocatalysts for solar-driven nitrogen fixation. [1] S. Nabi, M.M. Bhat, A. Hamid, A.Y. Bhat, A.U. Bashir, Q. Jan, P.P. Ingole, M. Bayati, M.A.J.A.S.S. Bhat, (2025) e00112. [2] G. Song, Y. Shi, B. Yang, Y. Yang, H.J.I.C. Pang, 64 (2025) 6265-6274.

Keywords: Photocatalytic nitrogen fixation; cobalt-based metal–organic frameworks; MOF-71; Co-BDC; MOF@MOF