One-dimensional (1D) ordered mesoporous carbon hybrid nanotubes loaded with bimetallic oxide hollow nanospheres are expected to be very attractive electrocatalysts . In this study, through high-temperature pyrolysis , we generated Mo 2 C@C PNTs with outstanding electrical conductivity , a significant surface area , and effective catalytic activity by wrapping ordered mesoporous polypyrroles on the surface of 1D MoO 3 nanotubes using block polymers that self-assembled. FeMnO 3 hollow porous nanospheres have a large specific surface area, many electroactive sites, and excellent molecular/charge diffusion properties, which can be compounded with 1D ordered mesoporous nitride-rich carbon to solve the problem of poor electrical conductivity of metal oxides and to prevent the accumulation of 1D nanotubes. The composite showed excellent electrocatalytic activity towards rutin due to the synergistic interaction between Mo 2 C@C PNTs and FeMnO 3 . In the best case, rutin has a limit of detection (LOD) as low as 0.35 × 10 −9 M and a wide linear range (3 × 10 −9 to 3.1 × 10 −6 M). The sensor displays a remarkable level of selective response to rutin in the presence of other co-interfering species. Furthermore, it has superb repeatability and reproducibility. The sensor has shown outstanding recovery (95.7–104.1 %) in the practical viability of detecting rutin in beverages. This work not only provides a new candidate for the accurate detection of rutin but also provides insight into the exploration of advanced sensing materials.
Weidong Sun,Guofeng Zhao,Ya Gao,Jiaqi Si,Ye Liu,Yong Lu
Chemical looping concept paves way toward intrinsically safe and efficient oxidative coupling of methane (CL-OCM) process, because it permits the reaction to proceed via repeating reduction-oxidation cycle in two reactors. It is calling for a ground-breaking catalyst with enough high selective CH 4 -converting lattice-oxygen carrying capacity but represents a grand challenge. Herein, we report an efficient catalyst obtainable by decorating an oxygen carrier FeMnO 3 with Na 2 WO 4 , with good cycling performance, achieving a high space time yield of 29.8 g C2-C3 kg cat. −1 h −1 with 20% CH 4 conversion and 80% C 2 -C 3 selectivity at 800 °C and a low catalyst/CH 4 weight ratio of 13.5. CL-OCM process is established by “FeMnO 3 ↔ [MnFe 2 O 4 + MnO]” redox cycle. Na 2 WO 4 -decoration gets lattice oxygen stored in FeMnO 3 transformed from non-selective to selective due to mitigation of lattice-oxygen evolution. Scaled up CL-OCM testing with 10-gram catalyst also yields comparable results seen in the case of using 1-gram catalyst, validating great application potential.
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