scholarly journals Reversing the charge transfer between platinum and sulfur-doped carbon support for electrocatalytic hydrogen evolution

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Qiang-Qiang Yan ◽  
Dao-Xiong Wu ◽  
Sheng-Qi Chu ◽  
Zhi-Qin Chen ◽  
Yue Lin ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Hydrogen Evolution ◽  
Carbon Support ◽  
Catalytic Performance ◽  
High Mass ◽  
Carbon Supports ◽  
Pt Nanoclusters ◽  
Size Dependent ◽  
Single Atoms ◽  
Metal Support Interaction

Abstract Metal–support interaction is of great significance for catalysis as it can induce charge transfer between metal and support, tame electronic structure of supported metals, impact adsorption energy of reaction intermediates, and eventually change the catalytic performance. Here, we report the metal size-dependent charge transfer reversal, that is, electrons transfer from platinum single atoms to sulfur-doped carbons and the carbon supports conversely donate electrons to Pt when their size is expanded to ~1.5 nm cluster. The electron-enriched Pt nanoclusters are far more active than electron-deficient Pt single atoms for catalyzing hydrogen evolution reaction, exhibiting only 11 mV overpotential at 10 mA cm−2 and a high mass activity of 26.1 A mg−1 at 20 mV, which is 38 times greater than that of commercial Pt/C. Our work manifests that the manipulation of metal size-dependent charge transfer between metal and support opens new avenues for developing high-active catalysts.

scholarly journals Thermal Modification Effect on Supported Cu-Based Activated Carbon Catalyst in Hydrogenolysis of Glycerol

Materials ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 603 ◽  
Author(s):  
Juan Seguel ◽  
Rafael García ◽  
Ricardo José Chimentão ◽  
José Luis García-Fierro ◽  
I. Tyrone Ghampson ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Specific Surface ◽  
Hydrogen Adsorption ◽  
Carbon Support ◽  
Catalytic Performance ◽  
Homogeneous Distribution ◽  
Surface Groups ◽  
Carbon Supports ◽  
Surface Areas ◽  
Oxygen Surface

Glycerol hydrogenolysis to 1,2-propanediol (1,2-PDO) was performed over activated carbon supported copper-based catalysts. The catalysts were prepared by impregnation using a pristine carbon support and thermally-treated carbon supports (450, 600, 750, and 1000 °C). The final hydrogen adsorption capacity, porous structure, and total acidity of the catalysts were found to be important descriptors to understand catalytic performance. Oxygen surface groups on the support controlled copper dispersion by modifying acidic and adsorption properties. The amount of oxygen species of thermally modified carbon supports was also found to be a function of its specific surface area. Carbon supports with high specific surface areas contained large amount of oxygen surface species, inducing homogeneous distribution of Cu species on the carbon support during impregnation. The oxygen surface groups likely acted as anchorage centers, whereby the more stable oxygen surface groups after the reduction treatment produced an increase in the interaction of the copper species with the carbon support, and determined catalytic performances.

scholarly journals Size-dependent strong metal-support interaction in TiO2 supported Au nanocatalysts

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Xiaorui Du ◽  
Yike Huang ◽  
Xiaoli Pan ◽  
Bing Han ◽  
Yang Su ◽  
...  
Keyword(s):  
Catalytic Performance ◽  
Hydrogenation Reaction ◽  
Au Nps ◽  
Size Dependent ◽  
Support Interaction ◽  
Alternative Approach ◽  
Metal Support Interaction ◽  
Metal Support ◽  
Thermodynamic Equilibrium Model ◽  
Strong Metal Support Interaction

AbstractThe strong metal-support interaction (SMSI) has long been studied in heterogonous catalysis on account of its importance in stabilizing active metals and tuning catalytic performance. As a dynamic process taking place at the metal-support interface, the SMSI is closely related to the metal surface properties which are usually affected by the size of metal nanoparticles (NPs). In this work we report the discovery of a size effect on classical SMSI in Au/TiO2 catalyst where larger Au particles are more prone to be encapsulated than smaller ones. A thermodynamic equilibrium model was established to describe this phenomenon. According to this finding, the catalytic performance of Au/TiO2 catalyst with uneven size distribution can be improved by selectively encapsulating the large Au NPs in a hydrogenation reaction. This work not only brings in-depth understanding of the SMSI phenomenon and its formation mechanism, but also provides an alternative approach to refine catalyst performance.

Spatially Resolved and Quantitatively Revealed Charge Transfer between Single Atoms and Catalyst Supports

2021 ◽  
Author(s):  
Bin Di ◽  
Zhantao Peng ◽  
Zhongyi Wu ◽  
Xiong Zhou ◽  
Kai Wu
Keyword(s):  
Charge Transfer ◽  
Charge State ◽  
Catalytic Performance ◽  
Single Atom ◽  
Catalyst Supports ◽  
Single Atoms ◽  
Spatially Resolved

The charge state of supported single atoms is one of the most significant aspects determining the catalytic performance of single atom catalysts (SACs) which have drawn tremendous attention in recent...

Optimizing electron density of nickel sulfide electrocatalysts through sulfur vacancy engineering for alkaline hydrogen evolution

2020 ◽  
Vol 8 (35) ◽  
pp. 18207-18214
Author(s):  
Dongbo Jia ◽  
Lili Han ◽  
Ying Li ◽  
Wenjun He ◽  
Caichi Liu ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Electron Density ◽  
Rational Design ◽  
Nickel Sulfide ◽  
Catalytic Performance ◽  
Sulfide Catalysts ◽  
Sulfur Vacancy

A novel, rational design for porous S-vacancy nickel sulfide catalysts with remarkable catalytic performance for alkaline HER.

Carbon Supports Mitigate Resistivity Limitations in Ni-Mo Alkaline Hydrogen Evolution Electrocatalysts

2018 ◽  
Author(s):  
Rituja Patil ◽  
Aayush Mantri ◽  
Stephen House ◽  
Judith C. Yang ◽  
James McKone
Keyword(s):  
Oxide Layer ◽  
Hydrogen Evolution ◽  
Interfacial Resistance ◽  
Carbon Supports ◽  
Vulcan Carbon

We have studied the composition and morphology of Ni-Mo alloys. These alloys consist of a Ni-rich core surrounded by Mo-rich oxide layer. The HER activity of Ni-Mo alloys was seen to be limited by interfacial resistance rather than kinetic and solution transport. Vulcan carbon, a conductive support mitigate the resistive limitations by providing conductive percolation networks.

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