scholarly journals The Effect of Iron Impurities on Transition Metal Catalysts for the Oxygen Evolution Reaction in Alkaline Environment: Activity Mediators or Active Sites?

2020 ◽  
Author(s):  
Ioannis Spanos ◽  
Justus Masa ◽  
Aleksandar Zeradjanin ◽  
Robert Schlögl
Keyword(s):  
Transition Metal ◽  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Active Sites ◽  
Water Electrolysis ◽  
Metal Catalysts ◽  
Transition Metal Catalysts ◽  
Alkaline Water Electrolysis ◽  
Co Catalysts ◽  
Model Transition

AbstractThere is an ongoing debate on elucidating the actual role of Fe impurities in alkaline water electrolysis, acting either as reactivity mediators or as co-catalysts through synergistic interaction with the main catalyst material. This perspective summarizes the most prominent oxygen evolution reaction (OER) mechanisms mostly for Ni-based oxides as model transition metal catalysts and highlights the effect of Fe incorporation on the catalyst surface in the form of impurities originating from the electrolyte or co-precipitated in the catalyst lattice, in modulating the OER reaction kinetics, mechanism and stability. Graphic Abstract

Strategy for Improving Oxygen Evolution Performance of Noble Metal Catalysts for Alkaline Water Electrolysis

2020 ◽  
Vol MA2020-02 (38) ◽  
pp. 2436-2436
Author(s):  
Sankar Sasidharan ◽  
Roby Soni ◽  
Hidenori Kuroki ◽  
Shoji Miyanishi ◽  
Anilkumar Gopinathan M ◽  
...  
Keyword(s):  
Oxygen Evolution ◽  
Noble Metal ◽  
Water Electrolysis ◽  
Metal Catalysts ◽  
Alkaline Water Electrolysis ◽  
Alkaline Water ◽  
Noble Metal Catalysts

scholarly journals Optimization of Oxygen Evolution Reaction with Electroless Deposited Ni–P Catalytic Nanocoating

Nanomaterials ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 3010
Author(s):  
Sergio Battiato ◽  
Mario Urso ◽  
Salvatore Cosentino ◽  
Anna Lucia Pellegrino ◽  
Salvo Mirabella ◽  
...  
Keyword(s):  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Active Sites ◽  
High Performance ◽  
Large Scale ◽  
Low Cost ◽  
Water Electrolysis ◽  
Synthetic Approach ◽  
Low Efficiency ◽  
Electrochemical Water Splitting

The low efficiency of water electrolysis mostly arises from the thermodynamic uphill oxygen evolution reaction. The efficiency can be greatly improved by rationally designing low-cost and efficient oxygen evolution anode materials. Herein, we report the synthesis of Ni–P alloys adopting a facile electroless plating method under mild conditions on nickel substrates. The relationship between the Ni–P properties and catalytic activity allowed us to define the best conditions for the electroless synthesis of highperformance Ni–P catalysts. Indeed, the electrochemical investigations indicated an increased catalytic response by reducing the thickness and Ni/P ratio in the alloy. Furthermore, the Ni–P catalysts with optimized size and composition deposited on Ni foam exposed more active sites for the oxygen evolution reaction, yielding a current density of 10 mA cm−2 at an overpotential as low as 335 mV, exhibiting charge transfer resistances of only a few ohms and a remarkable turnover frequency (TOF) value of 0.62 s−1 at 350 mV. The present study provides an advancement in the control of the electroless synthetic approach for the design and large-scale application of high-performance metal phosphide catalysts for electrochemical water splitting.

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