scholarly journals Remote ion-pair interactions in Fe-porphyrin-based molecular catalysts for the hydrogen evolution reaction

2019 ◽  
Vol 9 (5) ◽  
pp. 1301-1308 ◽  
Author(s):  
Sitthichok Kasemthaveechok ◽  
Bruno Fabre ◽  
Gabriel Loget ◽  
Rafael Gramage-Doria

The influence of ion-pair interactions between carboxy-containing iron porphyrins and the proton source in the hydrogen evolution reaction is described.

Author(s):  
Feng Wang ◽  
Jing Liu ◽  
Ying-Yi Ren ◽  
Jin Wu ◽  
Wu Xia ◽  
...  

The construction of artificial photosynthetic (AP) systems for hydrogen evolution reaction (HER) and carbon dioxide reduction reaction (CRR) is one of the hottest topics in the field of energy and...


Nanoscale ◽  
2021 ◽  
Author(s):  
Olivia Fernandez-Delgado ◽  
Alain Rafael Puente Santiago ◽  
Jolaine Galindo Betancourth ◽  
Mohamed F Sanad ◽  
Sreeprasad T Sreenivasan ◽  
...  

Considerable efforts are being made to find cheaper and more efficient alternatives to the currently commercially available catalysts based on precious metals for the Hydrogen Evolution Reaction (HER). In this...


Author(s):  
Sarmistha Bhunia ◽  
Atanu Rana ◽  
Shabnam Hematian ◽  
Kenneth D. Karlin ◽  
Abhishek Dey

2020 ◽  
Vol 117 (52) ◽  
pp. 32947-32953
Author(s):  
Kayla E. Clary ◽  
Metin Karayilan ◽  
Keelee C. McCleary-Petersen ◽  
Haley A. Petersen ◽  
Richard S. Glass ◽  
...  

Electrocatalytic generation of H2 is challenging in neutral pH water, where high catalytic currents for the hydrogen evolution reaction (HER) are particularly sensitive to the proton source and solution characteristics. A tris(hydroxymethyl)aminomethane (TRIS) solution at pH 7 with a [2Fe-2S]-metallopolymer electrocatalyst gave catalytic current densities around two orders of magnitude greater than either a more conventional sodium phosphate solution or a potassium chloride (KCl) electrolyte solution. For a planar polycrystalline Pt disk electrode, a TRIS solution at pH 7 increased the catalytic current densities for H2 generation by 50 mA/cm2 at current densities over 100 mA/cm2 compared to a sodium phosphate solution. As a special feature of this study, TRIS is acting not only as the primary source of protons and the buffer of the pH, but the protonated TRIS ([TRIS-H]+) is also the sole cation of the electrolyte. A species that is simultaneously the proton source, buffer, and sole electrolyte is termed a protic buffer electrolyte (PBE). The structure–activity relationships of the TRIS PBE that increase the HER rate of the metallopolymer and platinum catalysts are discussed. These results suggest that appropriately designed PBEs can improve HER rates of any homogeneous or heterogeneous electrocatalyst system. General guidelines for selecting a PBE to improve the catalytic current density of HER systems are offered.


2019 ◽  
Vol 10 (1) ◽  
Author(s):  
James McAllister ◽  
Nuno A. G. Bandeira ◽  
Jessica C. McGlynn ◽  
Alexey Y. Ganin ◽  
Yu-Fei Song ◽  
...  

2020 ◽  
Vol 8 (44) ◽  
pp. 23323-23329
Author(s):  
Jing Hu ◽  
Siwei Li ◽  
Yuzhi Li ◽  
Jing Wang ◽  
Yunchen Du ◽  
...  

Crystalline–amorphous Ni–Ni(OH)2 core–shell assembled nanosheets exhibit outstanding electrocatalytic activity and stability for hydrogen evolution under alkaline conditions.


2020 ◽  
Author(s):  
Elisabeth Hofmeister ◽  
Jisoo Woo ◽  
Tobias Ullrich ◽  
Lydia Petermann ◽  
Kevin Hanus ◽  
...  

Cobaloximes and their BF<sub>2</sub>-bridged analogues have emerged as promising non-noble metal catalysts for the photocatalytic hydrogen evolution reaction (HER). Herein we report the serendipitous discovery that double complex salts such as [Co(dmgh)<sub>2</sub>py<sub>2</sub>]<sup>+</sup>[Co(dmgBPh<sub>2</sub>)<sub>2</sub>Cl<sub>2</sub>]<sup>-</sup> can be obtained in good yields by treatment of commercially available [Co(dmgh)<sub>2</sub>pyCl] with triarylboranes. A systematic study on the use of such double complex salts and their single salts with simple counterions as photocatalysts revealed HER activities comparable or superior to existing cobaloxime catalysts and suggests ample opportunities for this compound class in catalyst/photosensitizer dyads and immobilized architectures. Preliminary electrochemical and spectroscopic studies indicate that one key advantage of these charged cobalt complexes is that the reduction potentials as well as the electrostatic interaction with charged photosensitizers can be tuned.


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