Cathodic electrochemical activation of Co3O4 nanoarrays: a smart strategy to significantly boost the hydrogen evolution activity

2018 ◽  
Vol 54 (17) ◽  
pp. 2150-2153 ◽  
Author(s):  
Li Yang ◽  
Huang Zhou ◽  
Xin Qin ◽  
Xiaodong Guo ◽  
Guanwei Cui ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Active Layer ◽  
Current Density ◽  
Room Temperature ◽  
Cathodic Polarization ◽  
Electrochemical Activation ◽  
Catalytic Current ◽  
Co3o4 Nanoarrays

The room-temperature cathodic polarization of Co3O4 leads to an ultrathin amorphous Co–P shell as an active layer. Such a Co–P@Co3O4 hybrid nanoarray needs an overpotential of 73 mV to drive a geometrical catalytic current density of 10 mA cm−2 in 1.0 M KOH.

An amorphous FeMoS4 nanorod array toward efficient hydrogen evolution electrocatalysis under neutral conditions

2017 ◽  
Vol 53 (64) ◽  
pp. 9000-9003 ◽  
Author(s):  
Xiang Ren ◽  
Weiyi Wang ◽  
Ruixiang Ge ◽  
Shuai Hao ◽  
Fengli Qu ◽  
...  
Keyword(s):  
High Activity ◽  
Hydrogen Evolution ◽  
Current Density ◽  
Nanorod Array ◽  
Carbon Cloth ◽  
Catalytic Current ◽  
Neutral Media ◽  
Neutral Conditions

As a durable catalyst, an FeMoS4 nanorod array on carbon cloth shows high activity for hydrogen evolution in neutral media, achieving a geometrical catalytic current density of 10 mA cm−2 at an overpotential of 204 mV.

The Influence of Temperature of Electrodeposition on the Electrochemical Properties of Ni Coatings

2015 ◽  
Vol 228 ◽  
pp. 242-245
Author(s):  
Magdalena Popczyk ◽  
Bożena Łosiewicz
Keyword(s):  
Electrochemical Properties ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Current Density ◽  
Room Temperature ◽  
Steel Substrate ◽  
Influence Of Temperature ◽  
Surface Development ◽  
Deposition Current Density

Porous Ni coatings were prepared by galvanostatic electrodeposition on the steel substrate from the Watts type bath at the deposition current densityjdep= -250 mA cm2at the temperature 40, 50 and 60°C. Investigations of hydrogen evolution reaction (HER) on the obtained Ni electrodes were carried out in 5 M KOH solution at room temperature. It was found that with the increase in the electrodeposition temperature of the coatings, the activity of the Ni electrocatalysts towards the HER decreased due to diminishing surface development of the Ni coatings.

A highly stable CoMo2S4/Ni3S2 heterojunction electrocatalyst for efficient hydrogen evolution

2021 ◽  
Author(s):  
Minmin Wang ◽  
Mengke Zhang ◽  
Wenwu Song ◽  
Weiting Zhong ◽  
Xunyue Wang ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Current Density ◽  
A Current

A CoMo2S4/Ni3S2 heterojunction is prepared with an overpotential of only 51 mV to drive a current density of 10 mA cm−2 in 1 M KOH solution and ∼100% of the potential remains in the ∼50 h chronopotentiometric curve at 10 mA cm−2.

scholarly journals Microwave-Assisted vs. Conventional Hydrothermal Synthesis of MoS2 Nanosheets: Application towards Hydrogen Evolution Reaction

Crystals ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1040 ◽  
Author(s):  
Getachew Solomon ◽  
Raffaello Mazzaro ◽  
Vittorio Morandi ◽  
Isabella Concina ◽  
Alberto Vomiero
Keyword(s):  
Hydrothermal Synthesis ◽  
Hydrothermal Method ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Current Density ◽  
Crystal Morphology ◽  
Synthesis Method ◽  
Synthesis Methods ◽  
Mos2 Nanosheets ◽  
Microwave Assisted

Molybdenum sulfide (MoS2) has emerged as a promising catalyst for hydrogen evolution applications. The synthesis method mainly employed is a conventional hydrothermal method. This method requires a longer time compared to other methods such as microwave synthesis methods. There is a lack of comparison of the two synthesis methods in terms of crystal morphology and its electrochemical activities. In this work, MoS2 nanosheets are synthesized using both hydrothermal (HT-MoS2) and advanced microwave methods (MW-MoS2), their crystal morphology, and catalytical efficiency towards hydrogen evolution reaction (HER) were compared. MoS2 nanosheet is obtained using microwave-assisted synthesis in a very short time (30 min) compared to the 24 h hydrothermal synthesis method. Both methods produce thin and aggregated nanosheets. However, the nanosheets synthesized by the microwave method have a less crumpled structure and smoother edges compared to the hydrothermal method. The as-prepared nanosheets are tested and used as a catalyst for hydrogen evolution results in nearly similar electrocatalytic performance. Experimental results showed that: HT-MoS2 displays a current density of 10 mA/cm2 at overpotential (−280 mV) compared to MW-MoS2 which requires −320 mV to produce a similar current density, suggesting that the HT-MoS2 more active towards hydrogen evolutions reaction.

scholarly journals Skyrmion flow near room temperature in an ultralow current density

2012 ◽  
Vol 3 (1) ◽  
Author(s):  
X.Z. Yu ◽  
N. Kanazawa ◽  
W.Z. Zhang ◽  
T. Nagai ◽  
T. Hara ◽  
...  
Keyword(s):  
Current Density ◽  
Room Temperature
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