Cubic Co-Co prussian blue MOF-based transition metal phosphide as an efficient catalyst for visible light-driven water oxidation

Publication date: February 2020Source: Journal of Catalysis, Volume 382Author(s): Yinjuan Dong, Tian Tian, Chunjiang Xu, Kangwei Ma, Wanjun Sun, Yong DingAbstractDesigning and developing an efficient, economic and stable catalyst for photocatalytic water oxidation is a forefront topic of sustainable energy research. Herein, we rationally designed a CoP/NC (CoP nanoparticles embedded in nitrogen and carbon matrices) nanocube catalysts via a pyrolysis phosphidation strategy derived from Co-Co/PB (Co-Co prussian blue) MOF-based precursor, which was employed as a robust heterogeneous catalyst for photocatalytic water oxidation for the first time. The TEM and SEM tests exhibit that Co-Co/PB contributes to well-defined nanocube architecture features after phosphidation. Furthermore, the photocatalytic performance of CoP/NC nanocube catalyst was examined in photocatalytic water oxidation system using [Ru(bpy)3]2+ as photosensitizer and S2O82− as sacrificial electron acceptor. The result shows CoP/NC has a modest high O2 evolution rate of 901.5 mmol h−1 g−1, O2 yield of 36.1%, TOF of 34.5 × 10−3 molO2 molmetal−1 s−1, and quantum yield of 61.5%. Noteworthily, an amorphous CoOx layer on CoP/NC surface was observed by HRTEM test after light reaction. The amorphous CoOx layer and CoP form a core-shell structure (CoP@CoOx), which facilitates the electron transport effectively. Additionally, the CoP/NC nanocube catalyst shows good electrocatalytic oxygen evolution perfor...
Source: Journal of Catalysis - Category: Chemistry Source Type: research