scholarly journals Exploiting the Flexibility of the Pyrochlore Composition for Acid-Resilient Iridium Oxide Electrocatalysts in Proton Exchange Membranes

2021 ◽  
Author(s):  
David Burnett ◽  
Enrico Petrucco ◽  
Reza Jalili Kashtiban ◽  
Stewart F Parker ◽  
Jonathan Sharman ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Proton Exchange Membranes ◽  
Iridium Oxide ◽  
Proton Exchange ◽  
Pyrochlore Oxides

Iridate pyrochlore oxides (Na,Ca)2-x(Ir2-yMy)O6·nH2O (M = Sb, Zr, Ru, Rh) are studied as resilient electrocatalysts for the oxygen evolution reaction under acid conditions. The materials crystallise from aqueous solution under...

scholarly journals Increased Ir–Ir Interaction in Iridium Oxide during the Oxygen Evolution Reaction at High Potentials Probed by Operando Spectroscopy

ACS Catalysis ◽  
2021 ◽  
pp. 10043-10057
Author(s):  
Steffen Czioska ◽  
Alexey Boubnov ◽  
Daniel Escalera-López ◽  
Janis Geppert ◽  
Alexandra Zagalskaya ◽  
...  
Keyword(s):  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Iridium Oxide ◽  
Operando Spectroscopy ◽  
High Potentials

scholarly journals Recent advances in understanding oxygen evolution reaction mechanisms over iridium oxide

2021 ◽  
Author(s):  
Takahiro Naito ◽  
Tatsuya Shinagawa ◽  
Takeshi Nishimoto ◽  
Kazuhiro Takanabe
Keyword(s):  
Reaction Mechanism ◽  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Reaction Mechanisms ◽  
State Of The Art ◽  
Iridium Oxide ◽  
The State ◽  
Computational Studies ◽  
Recent Advances ◽  
Iridium Oxides

Recent spectroscopic and computational studies concerning the oxygen evolution reaction over iridium oxides are reviewed to provide the state-of-the-art understanding of its reaction mechanism.

scholarly journals Oxygen evolution catalysts under proton exchange membrane conditions in a conventional three electrode cell vs. electrolyser device: a comparison study and a 3D-printed electrolyser for academic labs

2021 ◽  
Author(s):  
Michelle P. Browne ◽  
James Dodwell ◽  
Filip Novotny ◽  
Sonia Jaśkaniec ◽  
Paul R. Shearing ◽  
...  
Keyword(s):  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Proton Exchange Membrane ◽  
Proton Exchange ◽  
Comparison Study ◽  
Electrode Cell ◽  
3D Printed ◽  
Exchange Membrane

In academic labs, most oxygen evolution reaction studies are carried out in conventional three-electrode cell set-ups; however, this configuration may not accurately represent conditions experienced under practical electrolyser conditions.

Increasing Iridium Oxide Activity for the Oxygen Evolution Reaction with Hafnium Modification

2021 ◽  
Vol 143 (38) ◽  
pp. 15616-15623
Author(s):  
Fang Zhao ◽  
Bo Wen ◽  
Wenhan Niu ◽  
Zhu Chen ◽  
Chao Yan ◽  
...  
Keyword(s):  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Iridium Oxide

Heterostructure of core-shell IrCo@IrCoOx as efficient and stable catalysts for oxygen evolution reaction

2021 ◽  
Author(s):  
Xiaoping Ma ◽  
Lili Deng ◽  
Manting Lu ◽  
Yi He ◽  
Shuai Zou ◽  
...  
Keyword(s):  
Oxygen Evolution ◽  
Noble Metal ◽  
Oxygen Evolution Reaction ◽  
Proton Exchange Membrane ◽  
Precious Metals ◽  
Life Time ◽  
Proton Exchange ◽  
Core Shell ◽  
Large Current ◽  
Amorphous Metal Oxide

Abstract Although researches on non-noble metal electrocatalysts have been made some progress recently, their performance in proton exchange membrane water electrolyzer (PEMWE) is still incomparable to that of noble-metal-based catalysts. Therefore, it is a more practical way to improve the utilization of precious metals in electrocatalysts for oxygen evolution reaction (OER) in the acidic medium. Herein, nanostructured IrCo@IrCoOx core-shell electrocatalysts composed of IrCo alloy core and IrCoOx shell were synthesized through a simple colloidally synthesis and calcination method. As expected, the hybrid IrCo-200 NPs with petal-like morphology show the best OER activities in acidic electrolytes. They deliver lower overpotential and better electrocatalytic kinetics than pristine IrCo alloy and commercial Ir/C, reaching a low overpotential (j = 10 mA/cm2) of 259 mV (vs. RHE) and a Tafel slope of 59 mV dec−1. The IrCo-200 NPs displayed robust durability with life time of about 55 h in acidic solution under a large current density of 50 mA/cm2. The enhanced electrocatalytic activity may be associated with the unique metal/amorphous metal oxide core-shell heterostructure, allowing the improved charge transferability. Moreover, the *OH-rich amorphous shell functions as the active site for OER and prevents the further dissolution of the metallic core and thus ensures high stability.

Aqueous-phase synthesis of layered double hydroxide nanoplates as catalysts for the oxygen evolution reaction

2018 ◽  
Vol 47 (48) ◽  
pp. 17342-17348 ◽  
Author(s):  
Euiyoung Jung ◽  
Jae Kyeom Kim ◽  
Hyungsuk Choi ◽  
Min Hyung Lee ◽  
Taekyung Yu
Keyword(s):  
Aqueous Solution ◽  
Transition Metal ◽  
Oxygen Evolution ◽  
Layered Double Hydroxide ◽  
Aqueous Phase ◽  
Oxygen Evolution Reaction ◽  
Metal Salt ◽  
Catalytic Performance ◽  
Phase Synthesis ◽  
Double Hydroxide

Transition metal LDH nanoplates were synthesized by heating an aqueous solution containing a metal salt, PEG, and octylamine. The LDH nanoplates showed comparable electrochemical catalytic performance for the oxygen evolution reaction.

Towards a generic understanding of oxygen evolution reaction kinetics in polymer electrolyte water electrolysis

2020 ◽  
Vol 13 (7) ◽  
pp. 2153-2166 ◽  
Author(s):  
Tobias Schuler ◽  
Taro Kimura ◽  
Thomas J. Schmidt ◽  
Felix N. Büchi
Keyword(s):  
Reaction Kinetics ◽  
Kinetic Parameters ◽  
Polymer Electrolyte ◽  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Reaction Order ◽  
Water Electrolysis ◽  
Iridium Oxide

The reaction order of water and the electro-kinetic parameters are determined for the oxygen evolution reaction on iridium oxide.

Efficient oxygen evolution on mesoporous IrOx nanosheets

2019 ◽  
Vol 9 (14) ◽  
pp. 3697-3702 ◽  
Author(s):  
Bo Jiang ◽  
Jeonghun Kim ◽  
Yanna Guo ◽  
Kevin C. W. Wu ◽  
Saad M. Alshehri ◽  
...  
Keyword(s):  
High Activity ◽  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Iridium Oxide ◽  
Ph Values

Amorphous iridium oxide (IrOx) is a promising catalyst that has high activity in the oxygen evolution reaction (OER) over a broad range of pH values.

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