期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 340, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apcatb.2023.123229
关键词
Electrocatalytic oxidation; p-Xylene; Transition metal phosphide; Surface reconstruction; Terephthalic acid
A nickel foam-supported molybdenum dioxide/molybdenum phosphide hybrid electrocatalyst (MoO2/MoP/NF) is reported for highly selective generation of terephthalic acid (TA) via electrocatalytic oxidation (ECO) of p-xylene (PX) in alkaline medium. The MoO2/MoP/NF anode material shows a unique cluster like nanocone architecture, providing abundant active sites for efficient charge transfer kinetics. The synergy between MoO2 and MoP yields high TA selectivity of 94.8% and outstanding faradaic efficiency of 76.9% at a conversion of 71.6%.
Selective oxidation of p-xylene (PX) to terephthalic acid (TA) remains exceptionally challenging since it easily undergoes deep oxidation. Herein, a nickel foam-supported molybdenum dioxide/molybdenum phosphide hybrid electrocatalyst (MoO2/MoP/NF) is reported for highly selective generation of TA via electrocatalytic oxidation (ECO) of PX in alkaline medium. The efficient MoO2/MoP/NF anode material displays a unique cluster like nanocone architecture, showing abundant active sites and rapid charge transfer kinetics. Benefit from the synergy between MoO2 and MoP, the MoO2/MoP/NF provides a high TA selectivity of 94.8% and an outstanding faradaic efficiency of 76.9% at the conversion of 71.6%. Additionally, the anodic oxidation of PX over MoO2/ MoP/NF promotes the cathodic hydrogen production. The potential-induced surface reconstruction of the as synthesized MoO2/MoP/NF yields new phases of phosphomolybdate and potassium molybdate. The top P site on the phosphomolybdate surface facilitates the adsorption of reaction intermediates but weakens the adsorption of TA, thereby yielding high selectivity toward TA.
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