Highly Active and Stable Isolated Ir δ+ Sites in Iridium Phosphide for Propane Dehydrogenation
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Energy & Fuels↗
Engineering topics
Zhang, Wenqing
Publications and source records attributed to Zhang, Wenqing.
Contrasting Capability of Single Atom Palladium for Thermocatalytic versus Electrocatalytic Nitrate Reduction Reaction
The occurrence of high concentrations of nitrate in various water resources is a significant environmental and human health threat, demanding effective removal technologies. Single atom alloys (SAAs) have emerged as a promising bimetallic material architecture in various thermocatalytic and electrocatalytic schemes including nitrate reduction reaction (NRR). This study suggests that there exists a stark contrast between thermocatalytic (T-NRR) and electrocatalytic (E-NRR) pathways that resulted in dramatic differences in SAA performances. Among Pd/Cu nanoalloys with varying Pd–Cu ratios from 1:100 to 100:1, Pd/Cu (1:100) SAA exhibited the greatest activity (TOF Pd = 2 min –1 ) and highest N 2 selectivity (94%) for E-NRR, while the same SAA performed poorly for T-NRR as compared to other nanoalloy counterparts. DFT calculations demonstrate that the improved performance and N 2 selectivity of Pd/Cu (1:100) in E-NRR compared to T-NRR originate from the higher stability of NO 3 * in electrocatalysis and a lower N 2 formation barrier than NH due to localized pH effects and the ability to extract protons from water. Here, this study establishes the performance and mechanistic differences of SAA and nanoalloys for T-NRR versus E-NRR.
36 MATERIALS SCIENCE↗
Impregnation of KOAc on PdAu/SiO 2 causes Pd-acetate formation and metal restructuring
During catalyst preparation, the simple wet impregnation of KOAc on bimetallic PdAu/SiO 2 catalysts forms various Pd-acetate complexes, particularly at increasing concentrations of KOAc and AcOH, causing Pd leaching and metal restructuring.
Chemistry↗
Bismuth-Modulated Surface Structural Evolution of Pd[subscript 3]Bi Intermetallic Alloy Catalysts fo
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Zhang, Wenqing↗
Tuning colour centres at a twisted hexagonal boron nitride interface
The colour centre platform holds promise for quantum technologies, and hexagonal boron nitride has attracted attention due to the high brightness and stability, optically addressable spin states and wide wavelength coverage discovered in its emitters. However, its application is hindered by the typically random defect distribution and complex mesoscopic environment. In this study, employing cathodoluminescence, we demonstrate on-demand activation and control of colour centre emission at the twisted interface of two hexagonal boron nitride flakes. Further, we show that colour centre emission brightness can be enhanced by two orders of magnitude by tuning the twist angle. Additionally, by applying an external voltage, nearly 100% brightness modulation is achieved. Our ab initio GW and GW plus Bethe–Salpeter equation calculations suggest that the emission is correlated to nitrogen vacancies and that a twist-induced moiré potential facilitates electron–hole recombination. This mechanism is further exploited to draw nanoscale colour centre patterns using electron beams.
36 MATERIALS SCIENCE↗