Affiliation:
1. Department of Chemistry Renmin University of China Beijing 100872 China
2. 600 S Mathews Ave Roger Adams Laboratory Department of Chemistry University of Illinois Urbana Champaign IL 61820 USA
3. Beijing Key Laboratory of Lignocellulosic Chemistry College of Materials Science and Technology Beijing Forestry University Beijing 100083 China
Abstract
AbstractThe Nickel‐based catalysts have a good catalytic effect on the 5‐hydroxymethylfurfural electrooxidation reaction (HMFOR), but limited by the conversion potential of Ni2+/Ni3+, 1.35 V versus RHE, the HMF electrooxidation potential of nickel‐based catalysts is generally greater than 1.35 V versus RHE. Considering fluorine has the highest Pauling electronegativity and similar atomic radius of oxygen, the introduction of fluorine into the lattice of metal oxides might promote the adsorption of intermediate species, thus improving the catalytic performance. F is successfully doped into the lattice structure of NiCo2O4 spinel oxide by the strategy of hydrothermal reaction and low‐temperature fluorination. As is confirmed by in situ electrochemical impedance spectroscopy and Raman spectroscopy, the introduction of F weakens the interaction force of metal‐oxygen covalent bonds of the asymmetric MT‐O‐MO backbone and improves the valence of Ni in tetrahedra structure, which makes it easier to be oxidized to higher valence active Ni3+ under the action of electric field and promotes the adsorption of OH−, while the decrease of Co valence enhances the adsorption of HMF with the catalyst. Combining the above reasons, F‐NiCo2O4 shows superb electrocatalytic performance with a potential of only 1.297 V versus RHE at a current density of 20 mA cm−2, which is lower than the most catalyst.
Funder
National Natural Science Foundation of China
Subject
Biomaterials,Biotechnology,General Materials Science,General Chemistry