CO2 hydrogenation over Fe-Co bimetallic catalysts with tunable selectivity through a graphene fencing approach

Abstract

Tuning CO2 hydrogenation product distribution to obtain high-selectivity target products is of great significance. However, due to the imprecise regulation of chain propagation and hydrogenation reactions, the oriented synthesis of a single product is challenging. Herein, we report an approach to controlling multiple sites with graphene fence engineering that enables direct conversion of CO2/H2 mixtures into different types of hydrocarbons. Fe-Co active sites on the graphene fence surface present 50.1% light olefin selectivity, while the spatial Fe-Co nanoparticles separated by graphene fences achieve liquefied petroleum gas of 43.6%. With the assistance of graphene fences, iron carbides and metallic cobalt can efficiently regulate C-C coupling and olefin secondary hydrogenation reactions to achieve product-selective switching between light olefins and liquefied petroleum gas. Furthermore, it also creates a precedent for CO2 direct hydrogenation to liquefied petroleum gas via a Fischer-Tropsch pathway with the highest space-time yields compared to other reported composite catalysts.

Amorphous–crystalline CoFeB/NiPS3 vertical heterostructure with a built-in electric field for robust ampere-level water oxidation

“…According to the Bragg equation (2 d sin θ = nλ ), the increase in d was accompanied by a decrease in θ . 39 The XRD patterns prove that the CoFeB are amorphous, consistent with previous results. All the diffraction peaks of CFBN-3 can be indexed to the exf-NiPS 3 but were shifted to the larger angles.…”

Efficient and Accurate Theoretical Simulation on X-ray Photoelectron Spectroscopy for Iron Compounds

“…Although a plethora of investigations have explored diverse software and techniques, an efficient and accurate XPS theoretical simulation approach, especially for iron-based materials, is yet to be established. Nevertheless, iron-based materials hold paramount importance in both foundational research and industrial applications due to their economic viability, abundance, and superior catalytic activity. , The misalignment arises, on the one hand, due to the magnetic strong electron–electron interactions within iron-based systems, meaning that their electronic structure predictions are heavily reliant on the exchange correlation functional . Thus, identifying a plausible calculation technique poses a substantial challenge.…”