An efficient Sb-SnO2-supported IrO2 electrocatalyst for the oxygen evolution reaction in acidic medium

Tong, Jinlin; Liu, Yuan; Peng, Qi; Hu, Wei; Wu, Qiong

doi:10.1007/s10853-017-1447-1

Cited by 44 publications

(22 citation statements)

References 45 publications

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“…also reported poorer OER activity for ATO supported IrO 2 catalysts, with IrO 2 loading up to 31 %, in comparison to pure IrO 2 . For a catalyst with 50 % of IrO 2 , however, the performance surpassed that of IrO 2 . On the other hand, higher catalytic activities for mixed and supported catalyst, even with lower iridium loadings have been described .…”

Section: Discussionsupporting

confidence: 61%

Oxygen Evolution Reaction on Tin Oxides Supported Iridium Catalysts: Do We Need Dopants?

et al. 2020

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Application of oxide supports is considered as a viable approach to decrease iridium loading in oxygen evolution reaction catalysis in acid electrolyte. While the most of the promising oxides are poor conductors, the need for doping is typically taken as granted, and a representative example is tin dioxide. There are still, however, serious concerns on the feasibility of this approach as we lack consensus on any activity gain by using such oxides, while doubts on stability are numerous. In this work, a set of catalyst/support combinations including two catalysts, viz. hydrous (IrO x ) and rutile (IrO 2 ) iridium oxides, and four supports, viz. SnO 2 and Sb-(ATO), F-(FTO), and In-doped (ITO) SnO 2 , are synthesized and character-ized by a selection of complementary experimental techniques including rotating disk electrode and on-line inductively coupled plasma mass spectrometry. It is found that the electrochemical activity in acid media of supported Ir catalysts is essentially the same, independent on presence or absence of dopants. Sb and In dopants are shown to be unstable and cause an increased dissolution of Sn. Besides, the degradation of the doped supports results in destabilization of iridium oxides. These results raise doubts on the real need for the use of dopants in SnO 2 -based catalyst supports for electrochemical water splitting.

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Section: Discussionsupporting

confidence: 61%

Oxygen Evolution Reaction on Tin Oxides Supported Iridium Catalysts: Do We Need Dopants?

et al. 2020

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“…The enhanced activity is related to the interaction between the support and electrocatalyst. Various materials have been applied as supports of Ir, including metal oxides, such as ATO, TiO 2 , titanium suboxide (Ti n O 2 n −1 ), or ITO, and carbides, such as TiC, TaC, SiC, or WC, due to their corrosion resistance and electrical conductivity.…”

Section: Progress In Catalysts For the Oermentioning

confidence: 99%

“…Thanks to its good electronic conductivity, availability, high specific surface area, and stability at anodic potentials, ATO has been widely used as a support for the OER . The performance of ATO‐supported Pt or RuO 2 was better than that of pristine Pt/C or RuO 2 .…”

Section: Progress In Catalysts For the Oermentioning

confidence: 99%

Iridium‐Based Catalysts for Solid Polymer Electrolyte Electrocatalytic Water Splitting

et al. 2019

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Chemical energy conversion/storage through water splitting for hydrogen production has been recognized as the ideal solution to the transient nature of renewable energy sources. Solid polymer electrolyte (SPE) water electrolysis is one of the most practical ways to produce pure H2. Electrocatalysts are key materials in the SPE water electrolysis. At the anode side, electrode materials catalyzing the oxygen evolution reaction (OER) require specific properties. Among the reported materials, only iridium presents high activity and is more stable. In this Minireview, an application overview of single iridium metal and its oxide catalysts—binary, ternary, and multicomponent catalysts of iridium oxides and supported composite catalysts—for the OER in SPE water electrolysis is presented. Two main strategies to improve the activity of an electrocatalyst system, namely, increasing the number of active sites and the intrinsic activity of each active site, are reviewed with detailed examples. The challenges and perspectives in this field are also discussed.

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“…[3,4] Within the core-shell concept, large research efforts have therefore been undertaken towards dispersing the precious active oxides on a variety of inexpensive core materials comprising abundant metals, their nitrides, carbides or oxides. [5][6][7][8][9][10] Generally, though, these have been massively loaded composites with incoherent thick Ir or Ru oxide films or small nanoparticles that use the core material more like a high surface-area support. As one example we highlight IrO 2 dispersed on TiO 2 , [11][12][13] as has also already been commercialized in form of the recent Elyst Ir75 0480 catalyst from Umicore.…”

Section: Introductionmentioning

confidence: 99%

Epitaxial Core‐Shell Oxide Nanoparticles: First‐Principles Evidence for Increased Activity and Stability of Rutile Catalysts for Acidic Oxygen Evolution

2022

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Due to their high activity and favorable stability in acidic electrolytes, Ir and Ru oxides are primary catalysts for the oxygen evolution reaction (OER) in proton-exchange membrane (PEM) electrolyzers. For a future large-scale application, coreshell nanoparticles are an appealing route to minimize the demand for these precious oxides. Here, we employ firstprinciples density-functional theory (DFT) and ab initio thermodynamics to assess the feasibility of encapsulating a cheap rutile-structured TiO 2 core with coherent, monolayer-thin IrO 2 or RuO 2 films. Resulting from a strong directional dependence of adhesion and strain, a wetting tendency is only obtained for some low-index facets under typical gas-phase synthesis conditions. Thermodynamic stability in particular of latticematched RuO 2 films is instead indicated for more oxidizing conditions. Intriguingly, the calculations also predict an enhanced activity and stability of such epitaxial RuO 2 /TiO 2 coreshell particles under OER operation.

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An efficient Sb-SnO2-supported IrO2 electrocatalyst for the oxygen evolution reaction in acidic medium

Cited by 44 publications

References 45 publications

Oxygen Evolution Reaction on Tin Oxides Supported Iridium Catalysts: Do We Need Dopants?

Oxygen Evolution Reaction on Tin Oxides Supported Iridium Catalysts: Do We Need Dopants?

Iridium‐Based Catalysts for Solid Polymer Electrolyte Electrocatalytic Water Splitting

Epitaxial Core‐Shell Oxide Nanoparticles: First‐Principles Evidence for Increased Activity and Stability of Rutile Catalysts for Acidic Oxygen Evolution

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