An efficient route for catalytic activity promotion via hybrid electro-depositional modification on commercial nickel foam for hydrogen evolution reaction in alkaline water electrolysis

2014 ◽  
Vol 313 ◽  
pp. 512-523 ◽  
Author(s):  
Guanshui Ma ◽  
Yongwei He ◽  
Mei Wang ◽  
Fuchun Zhu ◽  
Bin Tang ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Nickel Foam ◽  
Water Electrolysis ◽  
Alkaline Water Electrolysis ◽  
Alkaline Water ◽  
Activity Promotion ◽  
Efficient Route

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.

scholarly journals Enhancement of hydrogen evolution reaction kinetics in alkaline media by fast galvanic displacement of nickel with rhodium – from smooth surfaces to electrodeposited nickel foams

2021 ◽  
Author(s):  
Aleksandar Jovanović ◽  
Lazar Bijelić ◽  
Ana Dobrota ◽  
Natalia Skorodumova ◽  
Slavko Mentus ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Nickel Foam ◽  
Water Electrolysis ◽  
Alkaline Media ◽  
Nickel Surface ◽  
Hydrogen Binding ◽  
Galvanic Displacement ◽  
Alkaline Water Electrolysis ◽  
Spontaneous Deposition

Energy-efficient hydrogen production is one of the key factors for advancing the hydrogen-based economy. Alkaline water electrolysis is the main route for the production of high-purity hydrogen, but further improvements of hydrogen evolution reaction (HER) catalysts are still needed. Industrial alkaline electrolysis relies on Ni-based catalysts, and here we describe a drastic improvement of HER activity of Ni in alkaline media using several model catalysts for HER obtained upon nickel surface modification in aqueous solution of rhodium salts, when a spontaneous deposition of rhodium takes place based on the chemical displacement reaction 3Ni + 2Rh3+ = 3Ni2+ + 2Rh. In the case of smooth Ni-poly electrodes, HER activity surpasses the activity of Pt-poly already after 30 s of exchange with Rh. SEM analysis showed that Rh is uniformly distributed, while surface roughness changes within 10%, agreeing with electrochemical measurements. Furthermore, XPS analysis has shown effective incorporation of Rh in the surface, while DFT calculations suggest that hydrogen binding is significantly weakened on the Rh-modified Ni surfaces. Such tuning of the hydrogen binding energy is seen as the main factor governing HER activity improvements. The same galvanic displacement protocols were employed for nickel foam electrodes and electrodeposited Ni on Ti mesh. In both cases, somewhat longer Rh exchange times are needed to obtain superior activities than for the smooth Ni surface, but up to 10 min. HER overpotential corresponding to −10 mA cm−2 for nickel foam and electrodeposited Ni electrodes, after modification with Rh, amounted to only −0.07 and −0.09 V, respectively. Thus, it is suggested that a fast spontaneous displacement of Ni with Rh could effectively boost HER in alkaline media with minor cost penalties compared to energy saving in the electrolysis process.

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.

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.

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