Photosynergy of Ag In Situ Anchored on AgNb1–xTaxO3 Solid Solutions as an Efficient and Durable Catalyst toward Nitrobenzene Reduction: Uncovering the Relevance of the Electronic Structure, Active Sites, and Catalytic Activity

2020 ◽  
Author(s):  
Fang Wang ◽  
Jiachen Song ◽  
Tingting Wang ◽  
Chunfang Du ◽  
Yiguo Su
Keyword(s):  
Electronic Structure ◽  
Catalytic Activity ◽  
Solid Solutions ◽  
Active Sites ◽  
Nitrobenzene Reduction

Photo-synergistic promoted in situ generation of Bi0–BiSbO4 nanostructures as an efficient catalyst for nitrobenzene reduction

RSC Advances ◽  
2015 ◽  
Vol 5 (125) ◽  
pp. 103013-103018 ◽  
Author(s):  
Mengqing Liu ◽  
Li Lv ◽  
Xiaomeng Du ◽  
Junyu Lang ◽  
Yiguo Su ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Efficient Catalyst ◽  
Nitrobenzene Reduction ◽  
In Situ Generation

This work reports on the construction of Bi0–BiSbO4 nanostructures to show photo-synergistic and efficient catalytic activity toward nitrobenzenes reduction.

scholarly journals In situ tuning of electronic structure of catalysts using controllable hydrogen spillover for enhanced selectivity

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Mi Xiong ◽  
Zhe Gao ◽  
Peng Zhao ◽  
Guofu Wang ◽  
Wenjun Yan ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Active Sites ◽  
Pt Nanoparticles ◽  
Atomic Layer ◽  
Hydrogen Spillover ◽  
General Strategy ◽  
Layer Deposition ◽  
Styrene Derivatives ◽  
Enhanced Selectivity

Abstract In situ tuning of the electronic structure of active sites is a long-standing challenge. Herein, we propose a strategy by controlling the hydrogen spillover distance to in situ tune the electronic structure. The strategy is demonstrated to be feasible with the assistance of CoOx/Al2O3/Pt catalysts prepared by atomic layer deposition in which CoOx and Pt nanoparticles are separated by hollow Al2O3 nanotubes. The strength of hydrogen spillover from Pt to CoOx can be precisely tailored by varying the Al2O3 thickness. Using CoOx/Al2O3 catalyzed styrene epoxidation as an example, the CoOx/Al2O3/Pt with 7 nm Al2O3 layer exhibits greatly enhanced selectivity (from 74.3% to 94.8%) when H2 is added. The enhanced selectivity is attributed to the introduction of controllable hydrogen spillover, resulting in the reduction of CoOx during the reaction. Our method is also effective for the epoxidation of styrene derivatives. We anticipate this method is a general strategy for other reactions.

Chemical etching manipulated local electronic structure upheaval of graphdiyne for efficient hydrogen evolution

2D Materials ◽  
2021 ◽  
Author(s):  
Kaikai Ma ◽  
Yunqi Zhao ◽  
Qingliang Liao ◽  
Zhaozhao Xiong ◽  
Xinting Li ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Catalytic Activity ◽  
Hydrogen Evolution ◽  
Chemical Etching ◽  
Active Sites ◽  
Theoretical Calculations ◽  
Great Expectation ◽  
Local Electronic Structure ◽  
A Current ◽  
Carbon Based

Abstract Graphdiyne (GDY), featured with unique sp2, sp-hybridized form and inherent inhomogeneous electron distribution, retains great expectation to be developed into highly efficient electrocatalysts for hydrogen evolution reaction (HER). However, the state-of-the-art GDY-based electrocatalysts still suffer from weak catalytic activity and sluggish reaction kinetics originating from the severe scarcity of in-plane active sites and insufficient electrical conductivity. Targeted at this bottleneck issue, electronic structure regulation, recognized as an extremely precise technical route, is promising to improve HER performances of carbon-based electrocatalysts. Herein, a facile controllable chemical etching strategy is well leveraged to introduce sp2-hybridized carbon-oxygen bonds (Csp2-O) into GDY for precise manipulation both of its electronic and spatial structures. Experimental results and theoretical calculations coherently manifest that Csp2-O introduction into GDY can not only induce its electronic structure upheaval to strengthen surface electron transport capability, but also trigger intensive carbon-oxygen p-p orbital hybridization to enhance the catalytic activity of acetylenic bond sites. As a result, the optimal GDY sample after etching delivers excellent HER performance with an overpotential of only 101 mV at a current density of 10 mA cm-2 and a low Tafel slope of 54 mV dec-1, which surpasses most of reported metal-free based electrocatalysts. This work provides a universal route for precise modulation of inherent electronic structure in GDY, and can be further extended to boost the overall performances of other carbon-based catalysts

Polyaniline Coating Enables Electronic Structure Engineering in Fe3O4 to Promote Alkaline Oxygen Evolution Reaction

2021 ◽  
Author(s):  
Yang Zou ◽  
Yuan Huang ◽  
Liwen Jiang ◽  
Arindam Indra ◽  
Yongqing Wang ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Active Sites ◽  
Simple Process ◽  
Molecular Modification ◽  
Mild Conditions ◽  
Novel Strategy ◽  
Structure Engineering

Abstract The electronic structure of active sites is of importance for catalysts to achieve an optimized interaction with the intermediates. In this study, a unique organic-inorganic hybrid oxygen evolution reaction (OER) electrocatalyst composed of electrochemically inactive conducting polyaniline (PANI) and non-precious Fe-based oxide Fe3O4 is presented. PANI molecules were in-situ loaded on Fe3O4 nanoparticles through an efficient and simple process under mild conditions. The electronic structure of Fe3O4 was modulated by creating a strong interaction with PANI molecules, leading to enhanced activity and stability of the catalyst to achieve 10 mA cm-2 geometrical current density at overpotential of 265 mV in 1 M aqueous KOH solution. This work demonstrates that a highly efficient electrocatalyst can be achieved by molecular modification and provides a novel strategy for the optimization of the inactive non-precious catalysts.

scholarly journals In situ X-ray emission and high-resolution X-ray absorption spectroscopy applied to Ni-based bimetallic dry methane reforming catalysts

Nanoscale ◽  
2020 ◽  
Vol 12 (28) ◽  
pp. 15185-15192
Author(s):  
Abbas Beheshti Askari ◽  
Mustafa al Samarai ◽  
Nozomu Hiraoka ◽  
Hirofumi Ishii ◽  
Lukas Tillmann ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Catalytic Activity ◽  
High Resolution ◽  
Absorption Spectroscopy ◽  
Methane Reforming ◽  
X Ray ◽  
Reforming Catalyst ◽  
Reforming Catalysts ◽  
X Ray Absorption

The effect of cobalt on the catalytic activity of a NiCoO dry methane reforming catalyst was investigated by in situ XES and HERFD XAS. Co is shown to hamper the reduction of the Ni in the NiCoO catalyst by modulation of its electronic structure.

Interface modulation of a layer-by-layer electrodeposited FexCo(1−x)P/NiP@CC heterostructure for high-performance oxygen evolution reaction

2020 ◽  
Vol 4 (4) ◽  
pp. 1863-1874 ◽  
Author(s):  
Bezawit Z. Desalegn ◽  
Harsharaj S. Jadhav ◽  
Jeong Gil Seo
Keyword(s):  
Catalytic Activity ◽  
Transition Metal ◽  
Oxygen Evolution ◽  
Alkaline Medium ◽  
Oxygen Evolution Reaction ◽  
Active Sites ◽  
High Performance ◽  
Layer By Layer ◽  
Interface Modulation

Heterostructuring assisted trimetallic transition metal phoshide with in situ generated active sites, exhibits superior catalytic activity towards oxygen evolution reaction in alkaline medium.

Lanthanum-incorporated β-Ni(OH)2 nanoarrays for robust urea electro-oxidation

2021 ◽  
Vol 57 (16) ◽  
pp. 2029-2032
Author(s):  
Pin Hao ◽  
Ying Xin ◽  
Qian Wang ◽  
Liyi Li ◽  
Zhenhuan Zhao ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Catalytic Activity ◽  
Active Sites ◽  
Band Center ◽  
Electro Oxidation

A novel electrocatalyst exhibits superior catalytic activity contributed to its optimized electronic structure, downshift of its d-band center and well-exposed active sites.

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