Electrochemical activity of 1T′ structured rhenium selenide nanosheets via electronic structural modulation from selenium-vacancy generation

2018 ◽  
Vol 6 (45) ◽  
pp. 22526-22533 ◽  
Author(s):  
Yuan Sun ◽  
Jie Meng ◽  
Huanxin Ju ◽  
Junfa Zhu ◽  
Qunxiang Li ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Electrochemical Activity ◽  
Controllable Synthesis ◽  
Vacancy Generation ◽  
Structural Modulation

The controllable synthesis of 1T′ structured ReSe2−x nanosheets with Se vacancies was achieved; the nanosheets were used as an efficient electrocatalyst for the hydrogen evolution reaction.

Controllable Synthesis of Ruthenium Phosphides (RuP and RuP2) for pH-Universal Hydrogen Evolution Reaction

2018 ◽  
Vol 6 (5) ◽  
pp. 6388-6394 ◽  
Author(s):  
Qingbo Chang ◽  
Jingwen Ma ◽  
Yuanzhi Zhu ◽  
Zhen Li ◽  
Danyun Xu ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Controllable Synthesis

Controllable synthesis of Mo2C with different morphology and application to electrocatalytic hydrogen evolution reaction

2021 ◽  
Author(s):  
He-qiang Chang ◽  
Guo-Hua Zhang ◽  
Kuo-Chih Chou
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Structural Design ◽  
Superior Performance ◽  
Controllable Synthesis ◽  
Nitridation Reaction ◽  
Special Surface ◽  
One Step ◽  
The One ◽  
Insight Into

Abstract In order to evaluate the effect of precursors and synthesis strategies on catalytic ability of Mo2C in the hydrogen evolution reaction (HER), four kinds of Mo2C were synthesized using two kinds of MoO3 by two strategies. Compared with the one-step direct carbonization strategy, Mo2C with a large special surface area and a better performance could be synthesized by the two-step strategy composed of a nitridation reaction and a carbonization reaction. Additionally, the as-prepared porous Mo2C nanobelts (NBs) exhibit good electrocatalytic performance with a small overpotential of 165 mV (0.5 M H2SO4) and 124 mV (1 M KOH) at 10 mA cm-2, as well as a Tafel slope of 58 mV dec-1 (0.5 M H2SO4) and 59 mV dec-1 (1 M KOH). The excellent catalytic activity is ascribed to the nano crystallites and porous structure. What’s more, the belt structure also facilitates the charge transport in the materials during the electrocatalytic HER process. Therefore, the two-step strategy provides a new insight into the structural design with superior performance for electrocatalytic HER.

MoS2 nanosheets grown on nickel chalcogenides: controllable synthesis and electrocatalytic origins for the hydrogen evolution reaction in alkaline solution

2019 ◽  
Vol 7 (37) ◽  
pp. 21514-21522 ◽  
Author(s):  
Anchun Long ◽  
Wanrong Li ◽  
Min Zhou ◽  
Weicheng Gao ◽  
Bitao Liu ◽  
...  
Keyword(s):  
Experimental Data ◽  
Theoretical Calculation ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Alkaline Solution ◽  
Mos2 Nanosheets ◽  
Controllable Synthesis ◽  
Calculation Results ◽  
Catalytic Mechanisms

Catalytic mechanisms and activity trend of Ni-based heterostructures were revealed by combining experimental data and theoretical calculation results.

Polarisation cathodique en milieu alcalin des alliages Nb–Co

1981 ◽  
Vol 59 (8) ◽  
pp. 1261-1266 ◽  
Author(s):  
Y. Umetsu ◽  
D. L. Piron ◽  
G. Bélanger
Keyword(s):  
Solid Solution ◽  
Optical Microscopy ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Cathodic Polarization ◽  
Electrochemical Activity ◽  
Surface Degradation ◽  
Δ Phase ◽  
The One ◽  
Increased Activity

NbCo alloys were prepared and their composition characterized by optical microscopy. These alloys were evaluated for their electrochemical activity towards the hydrogen evolution reaction (HER) at 25 °C in a 25% KOH solution. The alloys between 20 and 70wt% Co showed an increased activity compared to their parent metals. However the activity is below the one observed for pure Ni. As for the NbNi alloys, the NbCo undergo some surface degradation under prolonged (6 h) cathodic polarization at 400–700 mA cm−2. This disintegration of the surfaces is observed for alloys below 50% in Co. Above this proportion, the alloys remain stable towards the RDH. This degradation is associated with the presence of the δ phase in the alloy: this phase is the solid solution of Nb in the alloy.

scholarly journals Effect of Morphology and Mechanical Stability of Nanometric Platinum Layer on Nickel Foam for Hydrogen Evolution Reaction

Energies ◽  
2019 ◽  
Vol 12 (16) ◽  
pp. 3116
Author(s):  
Rachela G. Milazzo ◽  
Stefania M. S. Privitera ◽  
Silvia Scalese ◽  
Salvatore A. Lombardo
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Deposition Time ◽  
Mechanical Stability ◽  
Nickel Foam ◽  
Linear Sweep Voltammetry ◽  
Electrochemical Activity ◽  
Alkaline Electrolyte ◽  
Mechanical Instability ◽  
Platinum Layer

Platinum thin films are deposited on open-cell nickel foam with porosity of 95% via spontaneous galvanic displacement. Ni foams with different morphologies and pore size are compared and characterized by electrochemical and structural analysis techniques. The effect of Pt coating on the electrochemical activity is studied by using the Pt coated foam as electrode material for hydrogen evolution reaction in an aqueous alkaline electrolyte. The electrocatalytic activity of the electrodes is evaluated using linear sweep voltammetry curves and Tafel plots as a function of deposition time. The comparison with scanning electron microscopy analyses demonstrates that the catalytic activity has a maximum when the platinum film completely covers the Ni surface. The further increase of the Pt thickness leads to mechanical instability with crack formation and delamination. The effect of the foam morphology on the Pt deposition rate has been evaluated and discussed, determining the minimum Pt amount required to achieve the maximum electrochemical activity, as well as the maximum thickness in order to assure stable characteristics before delamination occurs.

Shape-controllable synthesis of Mo2C nanostructures as hydrogen evolution reaction electrocatalysts with high activity

2014 ◽  
Vol 134 ◽  
pp. 182-186 ◽  
Author(s):  
Chenjiao Ge ◽  
Ping Jiang ◽  
Wei Cui ◽  
ZongHua Pu ◽  
Zhicai Xing ◽  
...  
Keyword(s):  
High Activity ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Controllable Synthesis
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