Carbon materials have been recognized
as prospective catalysts
for the electrocatalytic 1,2-dichloroethane (DCE) dechlorination reaction
(DCEDR), which is an economical and environmentally friendly strategy
for the control of DCE contamination and production of highly valuable
ethylene. However, the precise nature of intrinsic defects (pentagon,
heptagon, octagon, armchair edge, and zigzag edge) in carbon-based
catalysts for the electrochemical DCEDR has not been reported to date.
Herein, theoretical calculations demonstrated that pentagon site showed
the lowest energy barrier of 0.12 eV, indicating a much higher electrochemical
reactivity and ethylene selectivity of pentagon defect than those
of others. The prediction results have been proved experimentally
based on a series of defective carbon materials with definitive defect
configurations. Therefore, intrinsic defects played a significant
role in the electrocatalytic DCEDR and pentagon defect was responsible
for the high performance of defective carbon catalysts. This work
not only clarifies the nature of intrinsic defects in carbon materials
for electrochemical DCEDR but also provides the design principles
for the rational preparation of advanced carbon electrocatalysts.
Ag3PO4/MIL‐53(Fe) composites were successfully synthesized via a facile grinding method. The resulting Ag3PO4/MIL‐53(Fe) composites exhibited excellent photocatalytic activities for Rhodamine B (RhB) degradation. Under visible light irradiation, RhB was completely decomposed after 90 min. Further experimental results revealed that the introduction of Ag3PO4 might inhibit the recombination of photogenerated electron‐hole pairs in the system. Through the grinding process, the effective interfacial contact between Ag3PO4 and MIL‐53(Fe) and more active sites were achieved, which are beneficial for the improvement of photocatalytic performance. In addition, a possible photocatalytic mechanism was proposed and the stability of photocatalyst was investigated in detail.
Hollow nanoreactors show great potential in catalysis due to the void-confinement effect. Yet few studies have investigated the void-confinement effect of hollow nanoreactors on intermediates. Herein, electrochemical NO reduction to NH 3 (ENOR) is used as a probe reaction to study the void-confinement effect of hollow Cu 2 O@CoMn 2 O 4 nanoreactors on intermediates. Combined with the results of catalytic activity, H 2 -treated in situ diffusion Fourier transform infrared spectroscopy and the finite-element method simulation confirm that the void-confinement effect on the intermediate is the main reason for enhanced ENOR efficiency. Additionally, theoretical calculations also show that the Cu sites of Cu 2 O@CoMn 2 O 4 nanoreactors are favorable for the formation of *NOH intermediates. This work not only gives an insight into void-confinement effect of hollow nanoreactors on intermediates but also provides a valuable strategy for improving ENOR.
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