scholarly journals Highly efficient and robust noble-metal free bifunctional water electrolysis catalyst achieved via complementary charge transfer

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Nam Khen Oh ◽  
Jihyung Seo ◽  
Sangjin Lee ◽  
Hyung-Jin Kim ◽  
Ungsoo Kim ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Noble Metal ◽  
State Of The Art ◽  
High Current Density ◽  
Water Electrolysis ◽  
High Current ◽  
Oxygen Intermediates ◽  
Enhanced Adsorption ◽  
Kinetics Of ◽  
Adsorption Capability

AbstractThe operating principle of conventional water electrolysis using heterogenous catalysts has been primarily focused on the unidirectional charge transfer within the heterostructure. Herein, multidirectional charge transfer concept has been adopted within heterostructured catalysts to develop an efficient and robust bifunctional water electrolysis catalyst, which comprises perovskite oxides (La0.5Sr0.5CoO3–δ, LSC) and potassium ion-bonded MoSe2 (K-MoSe2). The complementary charge transfer from LSC and K to MoSe2 endows MoSe2 with the electron-rich surface and increased electrical conductivity, which improves the hydrogen evolution reaction (HER) kinetics. Excellent oxygen evolution reaction (OER) kinetics of LSC/K-MoSe2 is also achieved, surpassing that of the noble metal (IrO2), attributed to the enhanced adsorption capability of surface-based oxygen intermediates of the heterostructure. Consequently, the water electrolysis efficiency of LSC/K-MoSe2 exceeds the performance of the state-of-the-art Pt/C||IrO2 couple. Furthermore, LSC/K-MoSe2 exhibits remarkable chronopotentiometric stability over 2,500 h under a high current density of 100 mA cm−2.

One-step Synthesis of Amorphous Nickel Iron Phosphide Hierarchical Nanostructures for Water Electrolysis with Superb Stability at High Current Density

2021 ◽  
Author(s):  
Yuefeng Yu ◽  
Xun He ◽  
Rong Li ◽  
Xinglong Gou
Keyword(s):  
High Performance ◽  
High Current Density ◽  
Water Electrolysis ◽  
Bifunctional Catalysts ◽  
High Current ◽  
Hierarchical Nanostructures ◽  
Iron Phosphide ◽  
Nickel Iron ◽  
Metal Free ◽  
One Step

Development of noble-metal-free high-performance bifunctional catalysts for both oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) is essential but challenging for hydrogen production from water electrolysis. Herein, amorphous bimetallic...

scholarly journals Chemically stabilised extruded and recast short side chain Aquivion® proton exchange membranes for high current density operation in water electrolysis

2019 ◽  
Vol 578 ◽  
pp. 136-148 ◽  
Author(s):  
Stefania Siracusano ◽  
Claudio Oldani ◽  
Maria Assunta Navarra ◽  
Stefano Tonella ◽  
Lucia Mazzapioda ◽  
...  
Keyword(s):  
Current Density ◽  
High Current Density ◽  
Water Electrolysis ◽  
Proton Exchange Membranes ◽  
Proton Exchange ◽  
Side Chain ◽  
High Current ◽  
Short Side

scholarly journals Investigation of the stability of NiFe-(oxy)hydroxide anodes in alkaline water electrolysis under industrially relevant conditions

2020 ◽  
Vol 10 (16) ◽  
pp. 5593-5601 ◽  
Author(s):  
Marco Etzi Coller Pascuzzi ◽  
Alex J. W. Man ◽  
Andrey Goryachev ◽  
Jan P. Hofmann ◽  
Emiel J. M. Hensen
Keyword(s):  
Elevated Temperature ◽  
Current Density ◽  
Anodic Polarization ◽  
High Current Density ◽  
Water Electrolysis ◽  
High Current ◽  
Alkaline Water Electrolysis ◽  
Alkaline Water ◽  
And Performance ◽  
The Stability

Anodic polarization conducted at high current density, elevated temperature, and high KOH concentration impacted the structure and performance of NiFeOxHy and NiOxHy anodes.

scholarly journals N-Doped Graphene-Decorated NiCo Alloy Coupled with Mesoporous NiCoMoO Nano-sheet Heterojunction for Enhanced Water Electrolysis Activity at High Current Density

2021 ◽  
Vol 13 (1) ◽  
Author(s):  
Guangfu Qian ◽  
Jinli Chen ◽  
Tianqi Yu ◽  
Lin Luo ◽  
Shibin Yin
Keyword(s):  
Current Density ◽  
Mechanical Stability ◽  
High Current Density ◽  
Nickel Foam ◽  
Water Electrolysis ◽  
Bifunctional Catalyst ◽  
Intrinsic Activity ◽  
High Current ◽  
Actual Application ◽  
Doped Graphene

AbstractDeveloping highly effective and stable non-noble metal-based bifunctional catalyst working at high current density is an urgent issue for water electrolysis (WE). Herein, we prepare the N-doped graphene-decorated NiCo alloy coupled with mesoporous NiCoMoO nano-sheet grown on 3D nickel foam (NiCo@C-NiCoMoO/NF) for water splitting. NiCo@C-NiCoMoO/NF exhibits outstanding activity with low overpotentials for hydrogen and oxygen evolution reaction (HER: 39/266 mV; OER: 260/390 mV) at ± 10 and ± 1000 mA cm−2. More importantly, in 6.0 M KOH solution at 60 °C for WE, it only requires 1.90 V to reach 1000 mA cm−2 and shows excellent stability for 43 h, exhibiting the potential for actual application. The good performance can be assigned to N-doped graphene-decorated NiCo alloy and mesoporous NiCoMoO nano-sheet, which not only increase the intrinsic activity and expose abundant catalytic activity sites, but also enhance its chemical and mechanical stability. This work thus could provide a promising material for industrial hydrogen production.

scholarly journals Sea coral-like NiCo2O4@(Ni, Co)OOH heterojunctions for enhancing overall water-splitting

2018 ◽  
Vol 8 (16) ◽  
pp. 4151-4158 ◽  
Author(s):  
Leiming Tao ◽  
Man Li ◽  
Shaohang Wu ◽  
Qinglong Wang ◽  
Xin Xiao ◽  
...  
Keyword(s):  
Water Splitting ◽  
Current Density ◽  
High Current Density ◽  
Low Cost ◽  
Water Electrolysis ◽  
Industrial Water ◽  
High Current ◽  
Overall Water Splitting

Efficient and low-cost sea coral-like NiCo2O4@(Ni, Co)OOH heterojunction catalysts meet the high current density requirements for industrial water electrolysis applications.

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