Efficient Solar‐Driven CO<sub>2</sub> Methanation and Hydrogen Storage Over Nickel Catalyst Derived from Metal–Organic Frameworks with Rich Oxygen Vacancies
Huiling Wang, Qiang Li, Jin Chen, Jin Chen, Jing Chen, Jing Chen, Hongpeng Jia
Abstract
Abstract Solar‐driven photothermal conversion of carbon dioxide (CO 2 ) to methane (CH 4 ) is a promising approach to remedy energy shortage and climate changes, where highly efficient photothermal catalysts for CO 2 methanation urgently need to be designed. Herein, nickel‐based catalysts (Ni/ZrO 2 ) derived from metal–organic frameworks (MOFs) are fabricated and studied for photothermal CO 2 methanation. The optimized catalyst 50Ni/ZrO 2 achieves a stable CH 4 production rate of 583.3 mmol g −1 h −1 in a continuous stability test, which is almost tenfold higher than that of 50Ni/C‐ZrO 2 synthesized via commercial ZrO 2 . Physicochemical properties indicate that 50Ni/ZrO 2 generates more tetragonal ZrO 2 and possesses more oxygen vacancies (OVs) as well as enhanced nickel‐ZrO 2 interaction. As a result, 50Ni/ZrO 2 exhibits the strong abilities of light absorption and light‐to‐heat conversion, superior adsorption capacities of reactants (H 2 , CO 2 ), and an intermediate product (CO), which finally boosts CH 4 formation. This work provides an efficient strategy to design a photothermocatalyst of CO 2 methanation through utilizing MOFs‐derived support.