scholarly journals Partial Surface Selenization of Cobalt Sulfide Microspheres for Enhancing the Hydrogen Evolution Reaction

ACS Catalysis ◽  
2018 ◽  
Vol 9 (1) ◽  
pp. 456-465 ◽  
Author(s):  
Biswanath Dutta ◽  
Yang Wu ◽  
Jie Chen ◽  
Jin Wang ◽  
Junkai He ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Cobalt Sulfide

Phase controllable fabrication of zinc cobalt sulfide hollow polyhedra as high-performance electrocatalysts for the hydrogen evolution reaction

Nanoscale ◽  
2018 ◽  
Vol 10 (4) ◽  
pp. 1774-1778 ◽  
Author(s):  
Bowei Zhang ◽  
Guang Yang ◽  
Chaojiang Li ◽  
Kang Huang ◽  
Junsheng Wu ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Thermal Annealing ◽  
Hydrogen Evolution Reaction ◽  
High Performance ◽  
Room Temperature ◽  
Cobalt Sulfide ◽  
Controllable Fabrication

Zn–Co–S hollow/porous polyhedrons with controllable phases were fabricatedviasolvent-based sulfidation at room temperature followed by thermal annealing, which exhibit an excellent electrocatalytic HER activity.

Freestanding 3D graphene/cobalt sulfide composites for supercapacitors and hydrogen evolution reaction

RSC Advances ◽  
2015 ◽  
Vol 5 (9) ◽  
pp. 6886-6891 ◽  
Author(s):  
Yang Wang ◽  
Jing Tang ◽  
Biao Kong ◽  
Dingsi Jia ◽  
Yuhang Wang ◽  
...  
Keyword(s):  
Energy Storage ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
High Efficiency ◽  
Cobalt Sulfide ◽  
Energy Storage And Conversion ◽  
Active Materials ◽  
3D Graphene ◽  
Electrochemically Active

The development of lightweight, flexible, electrochemically active materials with high efficiency is important for energy storage and conversion.

scholarly journals Highly stable hollow bifunctional cobalt sulfides for flexible supercapacitors and hydrogen evolution

2016 ◽  
Vol 4 (23) ◽  
pp. 9014-9018 ◽  
Author(s):  
C. K. Ranaweera ◽  
Z. Wang ◽  
Esam Alqurashi ◽  
P. K. Kahol ◽  
P. R. Dvornic ◽  
...  
Keyword(s):  
Electrochemical Properties ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Cobalt Sulfide ◽  
Flexible Supercapacitors

Hollow structured cobalt sulfide exhibits excellent electrochemical properties for highly stable flexible supercapacitors and the hydrogen evolution reaction (HER).

A crystalline–amorphous Ni–Ni(OH)2 core–shell catalyst for the alkaline hydrogen evolution reaction

2020 ◽  
Vol 8 (44) ◽  
pp. 23323-23329
Author(s):  
Jing Hu ◽  
Siwei Li ◽  
Yuzhi Li ◽  
Jing Wang ◽  
Yunchen Du ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Electrocatalytic Activity ◽  
Core Shell ◽  
Alkaline Conditions

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

Cobaloxime-Based Double Complex Salts as Efficient and Versatile Catalysts for the Light-Driven Hydrogen Evolution Reaction

2020 ◽  
Author(s):  
Elisabeth Hofmeister ◽  
Jisoo Woo ◽  
Tobias Ullrich ◽  
Lydia Petermann ◽  
Kevin Hanus ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Systematic Study ◽  
Cobalt Complexes ◽  
Spectroscopic Studies ◽  
Double Complex ◽  
Double Complex Salts ◽  
Noble Metal Catalysts ◽  
Reduction Potentials ◽  
Complex Salts

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.

2,2’-Dipyridylamine as Organic Molecular Electrocatalyst for Hydrogen Evolution Reaction in Acidic Electrolytes

2019 ◽  
Author(s):  
Xi Yin ◽  
Ling Lin ◽  
Hoon T. Chung ◽  
Ulises Martinez ◽  
Andrew M. Baker ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Density Functional ◽  
Low Cost ◽  
Membrane Electrode Assembly ◽  
Carbon Surface ◽  
Membrane Electrode ◽  
Durability Test ◽  
Onset Potential ◽  
Precious Metal Catalysts

Finding a low-cost and stable electrocatalyst for hydrogen evolution reaction (HER) as a replacement for scarce and expensive precious metal catalysts has attracted significant interest from chemical and materials research communities. Here, we demonstrate an organic catalyst based on 2,2’-dipyridylamine (dpa) molecules adsorbed on carbon surface, which shows remarkable hydrogen evolution activity and performance durability in strongly acidic polymer electrolytes without involving any metal. The HER onset potential at dpa adsorbed on carbon has been found to be less than 50 mV in sulfuric acid and in a Nafion-based membrane electrode assembly (MEA). At the same time, this catalyst has shown no performance loss in a 60-hour durability test. The HER reaction mechanisms and the low onset overpotential in this system are revealed based on electrochemical study. Density functional theory (DFT) calculations suggest that the pyridyl-N functions as the active site for H adsorption with a free energy of -0.13 eV, in agreement with the unusually low onset overpotential for an organic molecular catalyst.<br>

2,2’-Dipyridylamine as Organic Molecular Electrocatalyst for Hydrogen Evolution Reaction in Acidic Electrolytes

2019 ◽  
Author(s):  
Xi Yin ◽  
Ling Lin ◽  
Hoon T. Chung ◽  
Ulises Martinez ◽  
Andrew M. Baker ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Density Functional ◽  
Low Cost ◽  
Membrane Electrode Assembly ◽  
Carbon Surface ◽  
Membrane Electrode ◽  
Durability Test ◽  
Onset Potential ◽  
Precious Metal Catalysts

Finding a low-cost and stable electrocatalyst for hydrogen evolution reaction (HER) as a replacement for scarce and expensive precious metal catalysts has attracted significant interest from chemical and materials research communities. Here, we demonstrate an organic catalyst based on 2,2’-dipyridylamine (dpa) molecules adsorbed on carbon surface, which shows remarkable hydrogen evolution activity and performance durability in strongly acidic polymer electrolytes without involving any metal. The HER onset potential at dpa adsorbed on carbon has been found to be less than 50 mV in sulfuric acid and in a Nafion-based membrane electrode assembly (MEA). At the same time, this catalyst has shown no performance loss in a 60-hour durability test. The HER reaction mechanisms and the low onset overpotential in this system are revealed based on electrochemical study. Density functional theory (DFT) calculations suggest that the pyridyl-N functions as the active site for H adsorption with a free energy of -0.13 eV, in agreement with the unusually low onset overpotential for an organic molecular catalyst.<br>

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