scholarly journals Achieve flexible large-scale reactivity tuning by controlling phase, thickness and support of two-dimensional ZnO

2021 ◽  
Author(s):  
Le Lin ◽  
Zhenhua Zeng ◽  
Qiang Fu ◽  
Xinhe Bao
Keyword(s):  
Catalytic Activity ◽  
Chemical Reaction ◽  
Large Scale ◽  
Surface Reactivity ◽  
Two Dimensional ◽  
Effective Strategy ◽  
Catalyst Composition ◽  
Phase Thickness

Tuning surface reactivity of catalysts is an effective strategy to enhance catalytic activity towards a chemical reaction. Traditional reactivity tuning usually relies on a change of catalyst composition, especially when...

scholarly journals Beta-PdBi2 Monolayer: Two-Dimensional Topological Metal with Superior Catalytic Activity for Carbon Dioxide Electroreduction to Formic Acid

2020 ◽  
Author(s):  
Xiaorong Zhu ◽  
Yu Wang ◽  
Yu Jing ◽  
Thomas Heine ◽  
Yafei Li
Keyword(s):  
Catalytic Activity ◽  
Large Scale ◽  
Three Dimensional ◽  
Layered Materials ◽  
Spin Orbit Coupling ◽  
Two Dimensional ◽  
Promising Candidate ◽  
Onset Potential ◽  
Promising Solution ◽  
2D Crystals

The lack of efficient electrocatalysts has been a main obstacle for the large-scale commercialization of CO<sub>2</sub> electroreduction. In this work, we demonstrate that two-dimensional (2D) beta-PdBi<sub>2</sub> mono-layer is a promising solution for this issue. beta-PdBi<sub>2</sub> monolayer is a stable 2D crystal and the three-dimensional (3D) bulk interlayer energy is similar as for other layered materials that can be exfoliated into 2D crystals. Interestingly, beta-PdBi<sub>2</sub> monolayer has rather intri-guing electronic properties: while being metallic, it also has a non-trivial topological point. Remarkably, the extra electronic states at the Fermi level induced by the intrinsic spinorbit coupling (SOC) effect significantly enhance the adsorption of OCHO* intermediate on beta-PdBi<sub>2</sub> monolayer, resulting in a rather small onset potential of -0.26 V vs. RHE for CO<sub>2</sub> electroreduction to HCOOH. These results not only suggest a promising candidate for CO<sub>2</sub> electrolysis but also deepen our understanding of the factors dominating the catalytic activity of 2D materials. <br>

scholarly journals Beta-PdBi2 Monolayer: Two-Dimensional Topological Metal with Superior Catalytic Activity for Carbon Dioxide Electroreduction to Formic Acid

2020 ◽  
Author(s):  
Xiaorong Zhu ◽  
Yu Wang ◽  
Yu Jing ◽  
Thomas Heine ◽  
Yafei Li
Keyword(s):  
Catalytic Activity ◽  
Large Scale ◽  
Three Dimensional ◽  
Layered Materials ◽  
Spin Orbit Coupling ◽  
Two Dimensional ◽  
Promising Candidate ◽  
Onset Potential ◽  
Promising Solution ◽  
2D Crystals

The lack of efficient electrocatalysts has been a main obstacle for the large-scale commercialization of CO<sub>2</sub> electroreduction. In this work, we demonstrate that two-dimensional (2D) beta-PdBi<sub>2</sub> mono-layer is a promising solution for this issue. beta-PdBi<sub>2</sub> monolayer is a stable 2D crystal and the three-dimensional (3D) bulk interlayer energy is similar as for other layered materials that can be exfoliated into 2D crystals. Interestingly, beta-PdBi<sub>2</sub> monolayer has rather intri-guing electronic properties: while being metallic, it also has a non-trivial topological point. Remarkably, the extra electronic states at the Fermi level induced by the intrinsic spinorbit coupling (SOC) effect significantly enhance the adsorption of OCHO* intermediate on beta-PdBi<sub>2</sub> monolayer, resulting in a rather small onset potential of -0.26 V vs. RHE for CO<sub>2</sub> electroreduction to HCOOH. These results not only suggest a promising candidate for CO<sub>2</sub> electrolysis but also deepen our understanding of the factors dominating the catalytic activity of 2D materials. <br>

Solution‐Processed Large‐Scale Concentric‐Ring Laser on Two‐Dimensional Ruddlesden–Popper Perovskites Thin Films

2021 ◽  
pp. 2100193
Author(s):  
Peng Liu ◽  
Bingqian Zhang ◽  
Qing Liao ◽  
Guifen Tian ◽  
Chunling Gu ◽  
...  
Keyword(s):  
Thin Films ◽  
Ring Laser ◽  
Large Scale ◽  
Two Dimensional ◽  
Concentric Ring ◽  
Solution Processed

Large-scale visualization of dispersion of liquid-exfoliated two-dimensional nanosheets

2021 ◽  
Author(s):  
Xingyu Cui ◽  
Wen ying Shi ◽  
Chao Lu
Keyword(s):  
Aqueous Solution ◽  
Large Scale ◽  
Fluorescence Microscope ◽  
Visualization Method ◽  
Two Dimensional ◽  
Non Invasive

An ultrafast, non-invasive and large-scale visualization method has been developed to evaluate the dispersion of two-dimensional nanosheets in aqueous solution with fluorescence microscope by formation of excimers from improvement of...

scholarly journals Tyrosinase Nanoparticles: Understanding the Melanogenesis Pathway by Isolating the Products of Tyrosinase Enzymatic Reaction

2021 ◽  
Vol 22 (2) ◽  
pp. 734
Author(s):  
Paul K. Varghese ◽  
Mones Abu-Asab ◽  
Emilios K. Dimitriadis ◽  
Monika B. Dolinska ◽  
George P. Morcos ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Large Scale ◽  
Magnetic Beads ◽  
Enzymatic Reaction ◽  
Oculocutaneous Albinism ◽  
Transmission Electron ◽  
Hill Kinetics ◽  
Rate Limiting ◽  
Human Tyrosinase

Human Tyrosinase (Tyr) is the rate-limiting enzyme of the melanogenesis pathway. Tyr catalyzes the oxidation of the substrate L-DOPA into dopachrome and melanin. Currently, the characterization of dopachrome-related products is difficult due to the absence of a simple way to partition dopachrome from protein fraction. Here, we immobilize catalytically pure recombinant human Tyr domain (residues 19–469) containing 6xHis tag to Ni-loaded magnetic beads (MB). Transmission electron microscopy revealed Tyr-MB were within limits of 168.2 ± 24.4 nm while the dark-brown melanin images showed single and polymerized melanin with a diameter of 121.4 ± 18.1 nm. Using Hill kinetics, we show that Tyr-MB has a catalytic activity similar to that of intact Tyr. The diphenol oxidase reactions of L-DOPA show an increase of dopachrome formation with the number of MB and with temperature. At 50 °C, Tyr-MB shows some residual catalytic activity suggesting that the immobilized Tyr has increased protein stability. In contrast, under 37 °C, the dopachrome product, which is isolated from Tyr-MB particles, shows that dopachrome has an orange-brown color that is different from the color of the mixture of L-DOPA, Tyr, and dopachrome. In the future, Tyr-MB could be used for large-scale productions of dopachrome and melanin-related products and finding a treatment for oculocutaneous albinism-inherited diseases.

scholarly journals Universality class of the motility-induced critical point in large scale off-lattice simulations of active particles.

Soft Matter ◽  
2021 ◽  
Author(s):  
Claudio Maggi ◽  
Matteo Paoluzzi ◽  
Andrea Crisanti ◽  
Emanuela Zaccarelli ◽  
Nicoletta Gnan
Keyword(s):  
Phase Separation ◽  
Critical Point ◽  
Computer Simulations ◽  
Large Scale ◽  
Universality Class ◽  
Critical Behaviour ◽  
Two Dimensional ◽  
Dimensional Model ◽  
Active Particles ◽  
Two Dimensional Model

We perform large-scale computer simulations of an off-lattice two-dimensional model of active particles undergoing a motility-induced phase separation (MIPS) to investigate the systems critical behaviour close to the critical point...

Unusually High Ion Conductivity in Large-Scale Patternable Two-Dimensional MoS2 Film

ACS Nano ◽  
2021 ◽  
Author(s):  
Juhong Park ◽  
Sanket Bhoyate ◽  
Young-Hoon Kim ◽  
Young-Min Kim ◽  
Young Hee Lee ◽  
...  
Keyword(s):  
Large Scale ◽  
Ion Conductivity ◽  
Two Dimensional ◽  
Mos2 Film

scholarly journals Fabrication of Ultrathin MoS2 Nanosheets and Application on Adsorption of Organic Pollutants and Heavy Metals

Processes ◽  
2020 ◽  
Vol 8 (5) ◽  
pp. 504 ◽  
Author(s):  
Siyi Huang ◽  
Ziyun You ◽  
Yanting Jiang ◽  
Fuxiang Zhang ◽  
Kaiyang Liu ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Electrostatic Interactions ◽  
Large Scale ◽  
Layer Structure ◽  
Structural Characteristics ◽  
Hexagonal Phase ◽  
Two Dimensional ◽  
Mos2 Nanosheets ◽  
Hybrid Strategy ◽  
Ultrathin Mos2 Nanosheets

Owing to their peculiar structural characteristics and potential applications in various fields, the ultrathin MoS2 nanosheets, a typical two-dimensional material, have attracted numerous attentions. In this paper, a hybrid strategy with combination of quenching process and liquid-based exfoliation was employed to fabricate the ultrathin MoS2 nanosheets (MoS2 NS). The obtained MoS2 NS still maintained hexagonal phase (2H-MoS2) and exhibited evident thin layer-structure (1–2 layers) with inconspicuous wrinkle. Besides, the MoS2 NS dispersion showed excellent stability (over 60 days) and high concentration (0.65 ± 0.04 mg mL−1). The MoS2 NS dispersion also displayed evident optical properties, with two characteristic peaks at 615 and 670 nm, and could be quantitatively analyzed with the absorbance at 615 nm in the range of 0.01–0.5 mg mL−1. The adsorption experiments showed that the as-prepared MoS2 NS also exhibited remarkable adsorption performance on the dyes (344.8 and 123.5 mg g−1 of qm for methylene blue and methyl orange, respectively) and heavy metals (185.2, 169.5, and 70.4 mg g−1 of qm for Cd2+, Cu2+, and Ag+). During the adsorption, the main adsorption mechanisms involved the synergism of physical hole-filling effects and electrostatic interactions. This work provided an effective way for the large-scale fabrication of the two-dimensional nanosheets of transition metal dichalcogenides (TMDs) by liquid exfoliation.

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