scholarly journals Stoichiometry and surface structure dependence of hydrogen evolution reaction activity and stability of MoxC MXenes

2019 ◽  
Vol 371 ◽  
pp. 325-332 ◽  
Author(s):  
Saad Intikhab ◽  
Varun Natu ◽  
Justin Li ◽  
Yawei Li ◽  
Quanzheng Tao ◽  
...  
Keyword(s):  
Surface Structure ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Structure Dependence

Engineering stepped edge surface structures of MoS2 sheet stacks to accelerate the hydrogen evolution reaction

2017 ◽  
Vol 10 (2) ◽  
pp. 593-603 ◽  
Author(s):  
Jue Hu ◽  
Bolong Huang ◽  
Chengxu Zhang ◽  
Zilong Wang ◽  
Yiming An ◽  
...  
Keyword(s):  
Free Energy ◽  
Surface Structure ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Surface Structures ◽  
Edge Surface

Significantly enhanced HER kinetics were achieved by controllably fabricating a stepped MoS2 surface structure which possesses more optimal free energy of H-adsorption.

Hierarchical whisker-on-sheet NiCoP with adjustable surface structure for efficient hydrogen evolution reaction

Nanoscale ◽  
2018 ◽  
Vol 10 (16) ◽  
pp. 7619-7629 ◽  
Author(s):  
Zhicheng Cai ◽  
Aiping Wu ◽  
Haijing Yan ◽  
Yinglu Xiao ◽  
Congfang Chen ◽  
...  
Keyword(s):  
Surface Structure ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Carbon Catalyst ◽  
Effective Catalyst

The hierarchical whisker-on-sheet (HWS) NiCoP with favorable surface structure can be used as an effective catalyst for HER with activity close to Pt/carbon catalyst.

scholarly journals Local Surface Structure and Composition Control the Hydrogen Evolution Reaction on Iron Nickel Sulfides

2018 ◽  
Vol 57 (15) ◽  
pp. 4093-4097 ◽  
Author(s):  
Cameron L. Bentley ◽  
Corina Andronescu ◽  
Mathias Smialkowski ◽  
Minkyung Kang ◽  
Tsvetan Tarnev ◽  
...  
Keyword(s):  
Surface Structure ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Local Surface ◽  
Composition Control ◽  
Iron Nickel

Surface selectivity of Ni3S2 toward hydrogen evolution reaction: a first-principles study

2020 ◽  
Vol 22 (44) ◽  
pp. 25685-25694
Author(s):  
Bo Zhang ◽  
Xiuli Fu ◽  
Li Song ◽  
Xiaojun Wu
Keyword(s):  
Surface Structure ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
First Principles ◽  
Catalytic Performance ◽  
Hydrogen Energy ◽  
First Principles Study

Exploring materials with high catalytic performance toward hydrogen evolution reaction (HER) is of importance for the development of clean hydrogen energy, and their surface structure is essential for this function.

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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