Tongrui Shao,Liru Cao,Lin Li,Yang Su,Baolin Hou,Jian Lin,Xiaodong Wang
Water gas shift (WGS) reaction is an important process to remove CO contaminant in industrial hydrogen resources. The efficient catalyst that can work at low temperature is keenly desired to achieve high CO conversion from the viewpoint of thermodynamic equilibrium. Here, we develop a noble-metal-free catalyst of MoC nanorod (MoC NR) with the dominant (2 0 0) facet for the low-temperature WGS reaction. It exhibits a high performance with ∼ 100 % CO conversion at 175 °C, better than conventional MoC with the dominant (1 1 1) facet or the commercial Cu-based catalyst. Moreover, it shows rather better stability due to the presence of the dominant (2 0 0) facet. Various characterizations demonstrate that this facet facilitates MoC NR possessing higher removal capability of surface oxygen species to enhance the stability and lower activation energy to endow higher performance compared with conventional MoC. This study provides important implications for the rational design of cost-effective catalysts for the low-temperature WGS reaction.
3D multiporous Co, N co-doped MoO 2 /MoC (3D Co,N-MoO 2 /MoC) nanorods hybrids were successfully synthesized via carburizing core-shell ZIF-67-cladded MoO 3 nanorods precursor at high temperature. As-fabricated Co,N-MoO 2 /MoC nanorods coated glassy carbon electrodes (GCE) was demonstrated to possess superior electrocatalytic activity for the electro-oxidation of acetaminophen (AC) and 4-aminophenol (4-AP). Such excellent electrochemical performance was largely attributed to the synergistic effect of the unique multiporous structure, the optimal component and abundant active sites of the nanorods. The corresponding electrode reaction mechanisms were studied in detail in this article. Under optimal conditions, the linear detection ranges were 0.05–200.0 μmol/L for AC and 0.05–140.0 μmol/L for 4-AP, respectively, with the low detection limits of 0.013 μmol/L and 0.012 μmol/L. Furthermore, the 3D Co,N-MoO 2 /MoC/GCE revealed excellent sensitivity, good reproducibility, stability and anti-interference ability. The developed electrode was evaluated towards the detecting AC and 4-AP in biological fluids, environment water and pharmaceutical formulations with satisfactory recovery, which had a broad application prospect.
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