Elucidating the Role of Catalyst Steric and Electronic Effects in Controlling the Synthesis of π-Conjugated Polymers

2020 ◽  
Vol 53 (1) ◽  
pp. 138-148 ◽  
Author(s):  
Adam A. Pollit ◽  
Shuyang Ye ◽  
Dwight S. Seferos
Keyword(s):  
Conjugated Polymers ◽  
Electronic Effects

A β-cyclodextrin–resveratrol inclusion complex and the role of geometrical and electronic effects on its electronic induced circular dichroism

RSC Advances ◽  
2013 ◽  
Vol 3 (26) ◽  
pp. 10242 ◽  
Author(s):  
Eduardo Troche-Pesqueira ◽  
Ignacio Pérez-Juste ◽  
Armando Navarro-Vázquez ◽  
María Magdalena Cid
Keyword(s):  
Circular Dichroism ◽  
Inclusion Complex ◽  
Induced Circular Dichroism ◽  
Electronic Effects ◽  
Circular Dichroïsm

Formation of Oriented Nanostructures from Single Molecules of Conjugated Polymers in Microdroplets of Solution:  The Role of Solvent

2004 ◽  
Vol 37 (16) ◽  
pp. 6132-6140 ◽  
Author(s):  
Pradeep Kumar ◽  
Adosh Mehta ◽  
Shannon M. Mahurin ◽  
Sheng Dai ◽  
Mark D. Dadmun ◽  
...  
Keyword(s):  
Conjugated Polymers ◽  
Single Molecules ◽  
Role Of Solvent

scholarly journals The Role of the Side Chain on the Performance of N-type Conjugated Polymers in Aqueous Electrolytes

2018 ◽  
Vol 30 (9) ◽  
pp. 2945-2953 ◽  
Author(s):  
Alexander Giovannitti ◽  
Iuliana P. Maria ◽  
David Hanifi ◽  
Mary J. Donahue ◽  
Daniel Bryant ◽  
...  
Keyword(s):  
Conjugated Polymers ◽  
Side Chain ◽  
Aqueous Electrolytes

scholarly journals Understanding the Role of π-Conjugated Polymers as Binders in Enabling Designs for High-Energy/High-Rate Lithium Metal Batteries

2021 ◽  
Author(s):  
Rodrigo Elizalde-Segovia ◽  
Pratyusha Das ◽  
Billal Zayat ◽  
AHAMED IRSHAD ◽  
Barry Thompson ◽  
...  
Keyword(s):  
Conjugated Polymers ◽  
High Energy ◽  
High Rate ◽  
Lithium Metal ◽  
Lithium Metal Batteries

Electrophilic additions to allenes. VI. The role of steric versus electronic effects in the reactions of arenesulphenyl halides with allenes

1980 ◽  
Vol 58 (24) ◽  
pp. 2737-2744 ◽  
Author(s):  
Dennis G. Garrattz ◽  
Pierre L. Beaulieu
Keyword(s):  
Positive Charge ◽  
Steric Effects ◽  
Rate Data ◽  
Electronic Effects ◽  
Rate Determining Step ◽  
Minimal Importance ◽  
Electrophilic Additions

The role of steric and electronic effects during the rate and product determining steps for the addition of arenesulphenyl chlorides to 1,3-disubstituted allenes has been briefly examined. Both effects appear to be generally of minimal importance during the rate determining step. The available rate data indicate the presence of little, if any, build up of positive charge on sulphur. These results are interpreted in terms of an SN2 attack on bivalent sulphur leading to an alkylidenethiiranium ion intermediate. Steric effects are of greater importance in the product determining step, particularly when the sulphenyl chlorides possess two bulky ortho substituents, as in the case of 2,4,6-triisopropylbenzenesulphenyl chloride.

scholarly journals Fe-Doping in Double Perovskite PrBaCo2(1-x)Fe2xO6-δ: Insights into Structural and Electronic Effects to Enhance Oxygen Evolution Catalyst Stability

Catalysts ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 263 ◽  
Author(s):  
Bae-Jung Kim ◽  
Emiliana Fabbri ◽  
Ivano Castelli ◽  
Mario Borlaf ◽  
Thomas Graule ◽  
...  
Keyword(s):  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Double Perovskite ◽  
Alkaline Media ◽  
Catalyst Stability ◽  
Electronic Effects ◽  
Single Transition ◽  
Charge Stability ◽  
X Ray Absorption

Perovskite oxides have been gaining attention for its capability to be designed as an ideal electrocatalyst for oxygen evolution reaction (OER). Among promising candidates, the layered double perovskite—PrBaCo2O6-δ (PBC)—has been identified as the most active perovskite electrocatalyst for OER in alkaline media. For a single transition metal oxide catalyst, the addition of Fe enhances its electrocatalytic performance towards OER. To understand the role of Fe, herein, Fe is incorporated in PBC in different ratios, which yielded PrBaCo2(1-x)Fe2xCo6-δ (x = 0, 0.2 and 0.5). Fe-doped PBCF’s demonstrate enhanced OER activities and stabilities. Operando X-ray absorption spectroscopy (XAS) revealed that Co is more stable in a lower oxidation state upon Fe incorporation by establishing charge stability. Hence, the degradation of Co is inhibited such that the perovskite structure is prolonged under the OER conditions, which allows it to serve as a platform for the oxy(hydroxide) layer formation. Overall, our findings underline synergetic effects of incorporating Fe into Co-based layered double perovskite in achieving a higher activity and stability during oxygen evolution reaction.

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