“Superaerophobic” NiCo Bimetallic Phosphides for High-Efficient Hydrogen Evolution Reaction Electrocatalysts

2021 ◽  
Author(s):  
ling Zhang ◽  
Jiawei Huang ◽  
Zheng Qizheng ◽  
Li Ang ◽  
Li Xianglan ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Current Density ◽  
High Efficient ◽  
Bimetallic Phosphides

A “superaerophobic” NiCo bimetallic phosphides electrocatalyst has been fabricated by employing bimetal-organic frameworks as self-sacrificing templates. Only an overpotential of 205 mV can drive the HER current density to 800...

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.

Aged Co-Mo alloy thin film catalyst for hydrogen evolution reaction in acidic solution

2021 ◽  
pp. 2151018
Author(s):  
Cihan Kuru
Keyword(s):  
Thin Film ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Current Density ◽  
Acidic Solution ◽  
Alloy Film ◽  
Surface Oxide Layer ◽  
Alloy Thin Film ◽  
Acidic Solutions ◽  
Thin Film Catalyst

In this study, aged Co–Mo (3:10) alloy film has been demonstrated as an efficient and durable catalyst for hydrogen evolution reaction (HER) in acidic solution. The Co–Mo alloy films with varying Co/Mo atomic ratios have been deposited by magnetron sputtering. The catalytic activity of Mo film is outperformed by the Co–Mo alloys, among which the Co–Mo (3:10) alloy exhibits the highest HER activity with an overpotential of 310 mV at 10 mA cm[Formula: see text] current density, exchange current density of 1.74 × 10[Formula: see text] A cm[Formula: see text] and a Tafel slope of 61 mV dec[Formula: see text]. Combined with the good stability provided by the surface oxide layer, the aged Co–Mo (3:10) alloy is a promising catalyst for HER in acidic solutions.

A highly active and durable electrocatalyst for large current density hydrogen evolution reaction

2020 ◽  
Vol 65 (2) ◽  
pp. 123-130 ◽  
Author(s):  
Sen Xue ◽  
Zhibo Liu ◽  
Chaoqun Ma ◽  
Hui-Ming Cheng ◽  
Wencai Ren
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Current Density ◽  
Highly Active ◽  
Large Current ◽  
Large Current Density

Correlation of Exchange Current Density j₀ and the Standard Potential of the Metal Electrodes EM⁰ for the Hydrogen Evolution Reaction (HER)

2020 ◽  
Vol MA2020-01 (46) ◽  
pp. 2604-2604
Author(s):  
Daniel Lee Parr ◽  
Kasun Dadallagei ◽  
Sidney J. DeBie ◽  
Joshua R Coduto ◽  
Christian D Haas ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Current Density ◽  
Exchange Current ◽  
Exchange Current Density ◽  
Standard Potential ◽  
Metal Electrodes

MOF-derived hierarchical 3D bi-doped CoP nanoflower eletrocatalyst for hydrogen evolution reaction in both acidic and alkaline media

2020 ◽  
Vol 56 (56) ◽  
pp. 7702-7705 ◽  
Author(s):  
Lei Guo ◽  
Xue Bai ◽  
Hui Xue ◽  
Jing Sun ◽  
Tianshan Song ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Current Density ◽  
Alkaline Media ◽  
Alkaline Electrolyte ◽  
Acidic Electrolyte ◽  
Acidic And Alkaline Media ◽  
A Current

A 3D hierarchical Bi-doped CoP nanoflowers electrocatalyst is developed based on a MOF self-sacrifice strategy. The 3% Bi/CoP catalyst delivers a current density of 10 mA cm−2 at low overpotentials of 122 mV in alkaline electrolyte and 150 mV in acidic electrolyte.

Gas-templating of hierarchically structured Ni–Co–P for efficient electrocatalytic hydrogen evolution

2017 ◽  
Vol 5 (16) ◽  
pp. 7564-7570 ◽  
Author(s):  
Peili Zhang ◽  
Hong Chen ◽  
Mei Wang ◽  
Yong Yang ◽  
Jian Jiang ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Current Density ◽  
A Current

A hierarchically structured Ni–Co–P film exhibits remarkable activity toward the hydrogen evolution reaction with a current density of −10 mA cm−2 at −30 mV vs. the RHE.

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