scholarly journals The Structural Effect of Electrode Mesh on Hydrogen Evolution Reaction Performance for Alkaline Water Electrolysis

2021 ◽  
Vol 9 ◽  
Author(s):  
Hae In Lee ◽  
Hyun-Seok Cho ◽  
MinJoong Kim ◽  
Jae Hun Lee ◽  
ChangSoo Lee ◽  
...  
Keyword(s):  
Surface Area ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Water Electrolysis ◽  
Structural Effect ◽  
Pore Width ◽  
Alkaline Water Electrolysis ◽  
Morphological Effect ◽  
Alkaline Water ◽  
Reaction Performance

Alkaline water electrolysis (AWE) is a mature water electrolysis technology that can produce green hydrogen most economically. This is mainly attributed to the use of Ni-based materials that are easy to process and inexpensive. The nickel-based meshes with various structures such as woven mesh and expanded mesh are widely used as electrode in the AWE due to its common availability and easy fabrication. However, the morphological effect of meshes on hydrogen evolution reaction (HER) performance has not been studied. Here a new parameter to determine the structural effect of mesh on HER performance was first proposed. The key factors of the parameter were found to be the strand width, pore width and the strand surface area. The woven mesh with the ratio of pore width to strand width that converges to 1 showed the lowest the overpotential. The expanded mesh with the higher the structural surface area exhibited the lowest the overpotential. This study will help to choose an optimal structure for the mesh with the HER electrode.

Sacrificial Species Approach to Designing Robust Transition Metal Phosphide Cathodes for Alkaline Water Electrolysis in Discontinuous Operation

2021 ◽  
Author(s):  
Ik-Sun Kim ◽  
Hyun-Seok Cho ◽  
MinJoong Kim ◽  
Hyung-Jung Oh ◽  
Sang-Yeon Lee ◽  
...  
Keyword(s):  
Transition Metal ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Water Electrolysis ◽  
Alkaline Water Electrolysis ◽  
Metal Phosphide ◽  
Alkaline Water ◽  
Electrolysis Cells ◽  
Transition Metal Phosphide

The degradation of amorphous cobalt phosphides (CoPx) as electrocatalyst for hydrogen evolution reaction (HER) is studied in the discontinuous operation of alkaline water electrolysis cells (AWEs). Although amorphous CoPx shows...

scholarly journals Review of the Hydrogen Evolution Reaction—A Basic Approach

Energies ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 8535
Author(s):  
Thomas B. Ferriday ◽  
Peter Hugh Middleton ◽  
Mohan Lal Kolhe
Keyword(s):  
Energy Storage ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Ph Dependence ◽  
Water Electrolysis ◽  
Catalyst Design ◽  
Binding Energies ◽  
Current Status ◽  
Alkaline Water Electrolysis ◽  
Alkaline Water

An increasing emphasis on energy storage resulted in a surge of R&D efforts into producing catalyst materials for the hydrogen evolution reaction (HER) with emphasis on decreasing the usage of platinum group metal (PGMs). Alkaline water electrolysis holds promise for satisfying future energy storage demands, however the intrinsic potential of this technology is impeded by sluggish reaction kinetics. Here, we summarize the latest efforts within alkaline HER electrocatalyst design, where these efforts are divided between three catalyst design strategies inspired by the three prevailing theories describing the pH-dependence of the HER activity. Modifying the electronic structure of a host through codoping and creating specific sites for hydrogen/hydroxide adsorption stand out as promising strategies. However, with the vast amount of possible combinations, emphasis on screening parameters is important. The authors predict that creating a codoped catalyst using the first strategy by screening materials based on their hydrogen, hydroxide and water binding energies, and utilizing the second and third strategies as optimization parameters might yield both active and stable HER catalyst materials. This strategy has the potential to greatly advance the current status of alkaline water electrolysis as an energy storage option.

Electrodeposited Ni dendrites with high activity and durability for hydrogen evolution reaction in alkaline water electrolysis

2012 ◽  
Vol 22 (30) ◽  
pp. 15153 ◽  
Author(s):  
Sang Hyun Ahn ◽  
Seung Jun Hwang ◽  
Sung Jong Yoo ◽  
Insoo Choi ◽  
Hyoung-Juhn Kim ◽  
...  
Keyword(s):  
High Activity ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Water Electrolysis ◽  
Alkaline Water Electrolysis ◽  
Alkaline Water

Cu3p/N-Doped Carbon Catalyst with One-Step Synthesis Method for Hydrogen Evolution Reaction of Alkaline Water Electrolysis

2021 ◽  
Vol MA2021-01 (38) ◽  
pp. 1212-1212
Author(s):  
HyoWon Kim ◽  
Yongju Lee ◽  
DongHoon Song ◽  
YongKeun Kwon ◽  
Eom Ji Kim ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Synthesis Method ◽  
Water Electrolysis ◽  
Alkaline Water Electrolysis ◽  
Carbon Catalyst ◽  
Alkaline Water ◽  
One Step

Chestnut-like copper cobalt phosphide catalyst for all-pH hydrogen evolution reaction and alkaline water electrolysis

2019 ◽  
Vol 7 (23) ◽  
pp. 14271-14279 ◽  
Author(s):  
Liang Yan ◽  
Bing Zhang ◽  
Junlu Zhu ◽  
Shanzhi Zhao ◽  
Yunyong Li ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Alkaline Solution ◽  
Water Electrolysis ◽  
Alkaline Water Electrolysis ◽  
Alkaline Water ◽  
Cobalt Phosphide ◽  
Ph Values

Novel chestnut-like CuxCo1−xP/CP exhibited excellent activities for the HER at all pH values and the OER in alkaline solution.

scholarly journals Electrochemically Induced In-Situ Generated Co(OH)2 Nanoplates to Promote the Volmer Process Toward Efficient Alkaline Hydrogen Evolution Reaction

2020 ◽  
Author(s):  
Hong Liu ◽  
Jian-Jun Wang ◽  
Li-Wen Jiang ◽  
Yuan Huang ◽  
Bing Bing Chen ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Active Sites ◽  
Water Electrolysis ◽  
Water Dissociation ◽  
Alkaline Water Electrolysis ◽  
Additional Water ◽  
Dissociation Step ◽  
Insight Into

<p>Hydrogen production via alkaline water electrolysis is of significant interest. However, the additional water dissociation step makes the Volmer step a relatively more sluggish kinetics and consequently leads to a slower reaction rate than that in acidic solution. Herein, we demonstrate an effective strategy that Co(OH)<sub>2</sub> can promote the Volmer process by accelerating water dissociation and enhance the electrocatalytic performance of CoP toward alkaline hydrogen evolution reaction. The Co(OH)<sub>2</sub> nanoplates are electrochemically induced in-situ generated to form a nanotree-like structure with porous CoP nanowires, endowing the hybrid electrocatalyst with superior charge transportation, more exposed active sites, and enhanced reaction kinetics. This strategy may be extended to <a></a><a>other phosphides and chalcogenides </a>and provide insight into the design and fabrication of efficient alkaline HER catalysts.</p>

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