Pt-Based electrocatalysts with high atom utilization efficiency: from nanostructures to single atoms

2019 ◽  
Vol 12 (2) ◽  
pp. 492-517 ◽  
Author(s):  
Lei Zhang ◽  
Kieran Doyle-Davis ◽  
Xueliang Sun
Keyword(s):  
Catalytic Performance ◽  
Catalytic Reactions ◽  
Utilization Efficiency ◽  
Design And Synthesis ◽  
Single Atoms ◽  
Recent Developments

This review presents recent developments in the design and synthesis of Pt-based catalysts with high atom utilization efficiency and their enhanced catalytic performance in electrochemical catalytic reactions.

scholarly journals CO2 Methanation over Mesoporous Silica Based Catalyst: A Comprehensive Study

2019 ◽  
Vol 2 (2) ◽  
Author(s):  
Fatah N. A. A. ◽  
Jalil A. A. ◽  
Rahman A. F. A. ◽  
Hambali H. U. ◽  
Hussain I.
Keyword(s):  
Large Scale ◽  
Great Influence ◽  
Textural Properties ◽  
Catalytic Performance ◽  
Catalytic Reactions ◽  
Scale Production ◽  
Co2 Methanation ◽  
Large Scale Production ◽  
Recent Developments ◽  
Comprehensive Study

The abundance presence of CO2 released into the atmosphere has gained numerous consideration for an effective method to mitigate the CO2 build up and recycling the carbon resource. Among the catalytic reactions, the methanation of CO2 has been an indispensable reaction to transform toxic CO2 into methane which can be use as energy carrier or valuable chemical. The application of heterogeneous catalyst in CO2 methanation plays a significant role due to its effectiveness and stability which led to lower costs for large scale production.  This article discussed the recent developments of silica based catalyst for CO2 methanation with emphasized on its physicochemical properties and catalytic performance. In summary, the nature of silica support material such as morphology, textural properties and nature of basicity has a great influence on its catalytic performance towards CO2 methanation.

Tunable Carbon Surface from Mono- to Multi-Metallic Single Atoms

2020 ◽  
Author(s):  
Weihong Lai ◽  
Heng Wang ◽  
Quan jiang ◽  
Zichao Yan ◽  
Hanwen Liu ◽  
...  
Keyword(s):  
Synergistic Effects ◽  
Structural Evolution ◽  
Charge Compensation ◽  
Catalytic Reactions ◽  
Single Atom ◽  
Carbon Surface ◽  
Hydrogen Electrode ◽  
Single Atoms ◽  
Mass Activity ◽  
Co Doped

<p>Herein, we develop a non-selective charge compensation strategy to prepare multi-single-atom doped carbon (MSAC) in which a sodium p-toluenesulfonate (PTS-Na) doped polypyrrole (S-PPy) polymer is designed to anchor discretionary mixtures of multiple metal cations, including iron (Fe<sup>3+</sup>), cobalt (Co<sup>3+</sup>), ruthenium (Ru<sup>3+</sup>), palladium (Pd<sup>2+</sup>), indium (In<sup>3+</sup>), iridium (Ir<sup>2+</sup>), and platinum (Pt<sup>2+</sup>) . As illustrated in Figure 1, the carbon surface can be tuned with different level of compositional complexities, including unary Pt<sub>1</sub>@NC, binary (MSAC-2, (PtFe)<sub>1</sub>@NC), ternary (MSAC-3, (PtFeIr)<sub>1</sub>@NC), quaternary (MSAC-4, (PtFeIrRu)<sub>1</sub>@NC), quinary (MSAC-5, (PtFeIrRuCo)<sub>1</sub>@NC), senary (MSAC-6, (PtFeIrRuCoPd)<sub>1</sub>@NC), and septenary (MSAC-7, (PtFeIrRuCoPdIn)<sub>1</sub>@NC) samples. The structural evolution of carbon surface dictates the activities of both ORR and HER. The senary MSAC-6 achieves the ORR mass activity of 18.1 A·mg<sub>metal</sub><sup>-1</sup> at 0.9 V (Vs reversible hydrogen electrode (RHE)) over 30K cycles, which is 164 times higher than that of commercial Pt/C. The quaternary MSAC-4 presented a comparable HER catalytic capability with that of Pt/C. These results indicate that the highly complexed carbon surface can enhance its ability over general electrochemical catalytic reactions. The mechanisms regarding of the ORR and HER activities of the alternated carbon surface are also theoretically and experimentally investigated in this work, showing that the synergistic effects amongst the co-doped atoms can activate or inactivate certain single-atom sites.</p>

Hollow platinum tetrapods: using a combination of {111} facets, surface concave topology, and ultrathin walls to boost their oxygen reduction reactivity

2021 ◽  
Author(s):  
Mengmeng Li ◽  
Anzhou Yang ◽  
Siyuan Wang ◽  
Yingzi Wang ◽  
Qiuzi Huang ◽  
...  
Keyword(s):  
Oxygen Reduction ◽  
Catalytic Reactions ◽  
Utilization Efficiency

Hollow nanocages with ultrathin walls and specific configurations have been reported with stellar performance towards various catalytic reactions owing to their high atoms utilization efficiency and well-defined facets/architectures. Herein, we...

Network-supported, metal-mediated catalysis: progress and perspective

2020 ◽  
Vol 5 (10) ◽  
pp. 1892-1902
Author(s):  
Jeffrey A. Bennett ◽  
Bradley A. Davis ◽  
Kirill Efimenko ◽  
Jan Genzer ◽  
Milad Abolhasani
Keyword(s):  
Supported Catalysts ◽  
Catalytic Reactions ◽  
Wide Range ◽  
Recent Developments ◽  
Mediated Catalysis ◽  
Supported Metal

This minireview focuses on recent developments of network-supported catalysts to improve the performance of a wide range of metal-mediated catalytic reactions.

scholarly journals Unraveling the coordination structure-performance relationship in Pt1/Fe2O3 single-atom catalyst

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Yujing Ren ◽  
Yan Tang ◽  
Leilei Zhang ◽  
Xiaoyan Liu ◽  
Lin Li ◽  
...  
Keyword(s):  
Coordination Chemistry ◽  
Homogeneous Catalysis ◽  
Catalytic Performance ◽  
Inert Atmosphere ◽  
Single Atom ◽  
Unique Role ◽  
Local Coordination ◽  
Single Atoms ◽  
Heterogeneous And Homogeneous Catalysis

Abstract Heterogeneous single-atom catalyst (SAC) opens a unique entry to establishing structure–performance relationship at the molecular level similar to that in homogeneous catalysis. The challenge lies in manipulating the coordination chemistry of single atoms without changing single-atom dispersion. Here, we develop an efficient synthetic method for SACs by using ethanediamine to chelate Pt cations and then removing the ethanediamine by a rapid thermal treatment (RTT) in inert atmosphere. The coordination chemistry of Pt single atoms on a Fe2O3 support is finely tuned by merely adjusting the RTT temperature. With the decrease in Pt-O coordination number, the oxidation state of Pt decreases, and consequently the hydrogenation activity increases to a record level without loss of chemoselectivity. The tunability of the local coordination chemistry, oxidation states of the metal, and the catalytic performance of single atoms reveals the unique role of SACs as a bridge between heterogeneous and homogeneous catalysis.

scholarly journals Playing with covalent triazine framework tiles for improved CO2 adsorption properties and catalytic performance

2019 ◽  
Vol 10 ◽  
pp. 1217-1227 ◽  
Author(s):  
Giulia Tuci ◽  
Andree Iemhoff ◽  
Housseinou Ba ◽  
Lapo Luconi ◽  
Andrea Rossin ◽  
...  
Keyword(s):  
Carbon Capture ◽  
Rational Design ◽  
Gas Adsorption ◽  
Ambient Pressure ◽  
Complex Structure ◽  
Building Blocks ◽  
Catalytic Performance ◽  
High Specific Surface Area ◽  
Morphological Properties ◽  
Design And Synthesis

The rational design and synthesis of covalent triazine frameworks (CTFs) from defined dicyano-aryl building blocks or their binary mixtures is of fundamental importance for a judicious tuning of the chemico-physical and morphological properties of this class of porous organic polymers. In fact, their gas adsorption capacity and their performance in a variety of catalytic transformations can be modulated through an appropriate selection of the building blocks. In this contribution, a set of five CTFs (CTF1–5) have been prepared under classical ionothermal conditions from single dicyano-aryl or heteroaryl systems. The as-prepared samples are highly micro-mesoporous and thermally stable materials featuring high specific surface area (up to 1860 m2·g−1) and N content (up to 29.1 wt %). All these features make them highly attractive samples for carbon capture and sequestration (CCS) applications. Indeed, selected polymers from this series rank among the CTFs with the highest CO2 uptake at ambient pressure reported so far in the literature (up to 5.23 and 3.83 mmol·g−1 at 273 and 298 K, respectively). Moreover, following our recent achievements in the field of steam- and oxygen-free dehydrogenation catalysis using CTFs as metal-free catalysts, the new samples with highest N contents have been scrutinized in the process to provide additional insights to their complex structure–activity relationship.

Catalytic Properties of Cryogelated Noble Metal Aerogels

2017 ◽  
Vol 231 (1) ◽  
Author(s):  
Axel Freytag ◽  
Massimo Colombo ◽  
Nadja C. Bigall
Keyword(s):  
Noble Metal ◽  
Room Temperature ◽  
Catalyst Surface ◽  
Catalytic Properties ◽  
State Of The Art ◽  
Catalytic Performance ◽  
Model Reaction ◽  
Catalytic Reactions ◽  
Co Conversion ◽  
Oxidation Of Carbon Monoxide

AbstractThe catalytic properties of cryogelated noble metal aerogel monoliths out of aqueous colloids are investigated using the oxidation of carbon monoxide (CO) as a model reaction, in order to evaluate their potential for catalytic applications. Aerogels built of self-supporting platinum (Pt) and palladium (Pd) nanocrystals (NCs) have a directly accessible catalyst surface and show catalytic performance similar to state of the art catalysts while being support-free and therefore ultralight materials. In addition, these materials provide properties like room temperature CO conversion and spontaneous catalytic reactions. However, full material aerogel catalysts come with the side effect of limited thermal stability, which will have to be overcome in future.

scholarly journals The Underexplored Field of Lanthanide Complexes with Helicene Ligands: Towards Chiral Lanthanide Single Molecule Magnets

2021 ◽  
Vol 7 (10) ◽  
pp. 138
Author(s):  
Gabriela Handzlik ◽  
Katarzyna Rzepka ◽  
Dawid Pinkowicz
Keyword(s):  
Transition Metal Complexes ◽  
Single Molecule ◽  
Specific Rotation ◽  
Crystalline Material ◽  
Lanthanide Ions ◽  
Single Molecule Magnets ◽  
Design And Synthesis ◽  
Chiral Carbon ◽  
Effective Combination ◽  
Recent Developments

The effective combination of chirality and magnetism in a single crystalline material can lead to fascinating cross-effects, such as magneto–chiral dichroism. Among a large variety of chiral ligands utilized in the design and synthesis of chiral magnetic materials, helicenes seem to be the most appealing ones, due to the exceptionally high specific rotation values that reach thousands of deg×cm3×g−1×dm−1, which is two orders of magnitude higher than for compounds with chiral carbon atoms. Despite the sizeable family of transition metal complexes with helicene-type ligands, there are only a few examples of such complexes with lanthanide ions. In this mini-review, we describe the most recent developments in the field of lanthanide-based complexes with helicene-type ligands and summarize insights regarding the further exploration of this family of compounds towards multifunctional chiral lanthanide single molecule magnets (Ln-SMMs).

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