Dissolution-Induced Surface Roughening and Oxygen Evolution Electrocatalysis of Alkaline-Earth Iridates in Acid

Song, Chang Woo; Suh, Hoyoung; Bak, Jumi; Bae, Hyung Bin; Chung, Sung‐Yoon

doi:10.1016/j.chempr.2019.10.011

Cited by 111 publications

(109 citation statements)

References 55 publications

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“…The surface atoms at the electrode(electrocatalyst)/electrolyte interface under acidic/alkaline water oxidation condition are dynamically changed in their structural integrity. [ 48,52,54,108,109 ] Based on the structural features of the electrocatalysts, the dissolution of electrocatalyst components along with the applied potential originates the surface reconstruction and triggers structure evolution, resulting in enhanced OER performance. Specifically, the dynamic reconstruction of perovskite‐, spinel‐, and mixed metal alloy‐/oxide‐based OER electrocatalysts due to the dissolution of electrocatalyst component are discussed in this section.…”

Section: Synthesis Of Reconstructed Electrocatalysts For Oermentioning

confidence: 99%

“…[ 23,43,45 ] Also, the reconstruction process changes the surface of electrocatalysts reversibly or irreversibly depending on their structural features. [ 48–58 ] For example, the Co 3 O 4 electrocatalyst self‐reconstructed into amorphous CoO x (OH) y (di‐ u ‐oxobridged Co 3+/4+ ) under OER potential region can be reverted to the original structure when returning the potential to the non‐OER region . [ 59 ] Conversely, noble metal‐based electrocatalysts, transition metal‐based oxides and nonoxides (e.g., chalcogenides, pnictides, carbides, etc.)…”

Section: Introductionmentioning

confidence: 99%

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Reconstructed Water Oxidation Electrocatalysts: The Impact of Surface Dynamics on Intrinsic Activities

Selvam

Xia

et al. 2020

Adv Funct Materials

185

128

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Electroreduction of small molecules such as H2O, CO2, and N2 for producing clean fuels or valuable chemicals provides a sustainable approach to meet the increasing global energy demands and to alleviate the concern on climate change resulting from fossil fuel consumption. On the path to implement this purpose, however, several scientific hurdles remain, one of which is the low energy efficiency due to the sluggish kinetics of the paired oxygen evolution reaction (OER). In response, it is highly desirable to synthesize high‐performance and cost‐effective OER electrocatalysts. Recent advances have witnessed surface reconstruction engineering as a salient tool to significantly improve the catalytic performance of OER electrocatalysts. In this review, recent progress on the reconstructed OER electrocatalysts and future opportunities are discussed. A brief introduction of the fundamentals of OER and the experimental approaches for generating and characterizing the reconstructed active sites in OER nanocatalysts are given first, followed by an expanded discussion of recent advances on the reconstructed OER electrocatalysts with improved activities, with a particular emphasis on understanding the correlation between surface dynamics and activities. Finally, a prospect for clean future energy communities harnessing surface reconstruction‐promoted electrochemical water oxidation will be provided.

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Section: Synthesis Of Reconstructed Electrocatalysts For Oermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Reconstructed Water Oxidation Electrocatalysts: The Impact of Surface Dynamics on Intrinsic Activities

Selvam

Xia

et al. 2020

Adv Funct Materials

185

128

View full text Add to dashboard Cite

show abstract

“…expense of its easy corrosion. [14] Additionally, until now SrIrO 3 can only be prepared in the forms of thin films supported on catalytically-inert perovskite substrates [15][16][17] and free-standing, micrometer-scaled particles. [18] As a result, this perovskite material typically suffers from low surface areas and limited available catalytic active sites, which are detrimental to transferring its good specific activity to a real electrocatalyst with high mass activity.…”

Section: Doi: 101002/adma202001430mentioning

confidence: 99%

Perovskite‐Type Solid Solution Nano‐Electrocatalysts Enable Simultaneously Enhanced Activity and Stability for Oxygen Evolution

et al. 2020

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A trade‐off between catalytic activity and structural stability generally exists in oxygen evolution electrocatalysis, especially in acidic environment. This dilemma limits the development of higher‐performance electrocatalysts that are required by next‐generation electrochemical technologies. Here it is demonstrated that the inverse catalytic activity–structural stability relation can be broken by alloying catalytically inert strontium zirconate with the other catalytically active perovskite, strontium iridate. This strategy results in an alloyed perovskite electrocatalyst with simultaneously improved iridium mass activity and structural stability, by about five times, for the oxygen evolution reaction under acidic conditions. The experimental and theoretical results suggest that the alloying strategy generates multiple positive effects, mainly including the reduction of catalyst size, the decrease of catalyst covalency, and the weakening of surface oxygen‐binding ability. The synergistic optimization of bulk and surface properties, as a result, enhances the intrinsic activity and availability of surface iridium sites, whilst significantly inhibiting the surface cation corrosion during electrocatalysis.

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“…[ 21,25,26 ] In contrast, the kinetics of the electrode reactions in acidic solutions are much faster than that in alkaline and neutral ones due to the higher proton transfer rate between anode and cathode. [ 27–30 ] For example, a water electrolyzer with proton exchange membrane (PEM) in acidic solutions can reach up to 800–2500 mA cm −2 at 70–80 °C, while the one with anion exchange membrane in alkaline solutions delivers much lower current density of 200–500 mA cm −2 at 50–70 °C. [ 8,9 ] In addition, the operation voltages of PEM electrolyzers are lower than that with anion exchange membranes, due to their lower overpotentials on both anode and cathode.…”

Section: Introductionmentioning

confidence: 99%

Recent Progress in Electrocatalysts for Acidic Water Oxidation

Lei

Wang

Zhao

et al. 2020

Advanced Energy Materials

205

161

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Hydrogen is a clean and renewable energy carrier for powering future transportation and other applications. Water electrolysis is a promising option for hydrogen production from renewable resources such as wind and solar energy. To date, tremendous efforts have been devoted to the development of electrocatalysts and membranes for water electrolysis technology. In principle, water electrolysis in acidic media has several advantages over that in alkaline media, including favorable reaction kinetics, easy product separation, and low operating pressure. However, acidic water electrolysis poses higher requirements for the catalysts, especially the ones for the oxygen evolution reaction. It is a grand challenge to develop highly active, durable, and cost‐effective catalysts to replace precious metal catalysts for acidic water oxidation. In this article, an overview is presented of the latest developments in design and synthesis of electrocatalysts for acidic water oxidation, emphasizing new strategies for achieving high electrocatalytic activity while maintaining excellent durability at low cost. In particular, the reaction pathways and intermediates are discussed in detail to gain deeper insight into the oxygen evolution reaction mechanism, which is vital to rational design of more efficient electrocatalysts. Further, the remaining scientific challenges and possible strategies to overcome them are outlined, together with perspectives for future‐generation electrocatalysts that exploit nanoscale materials for water electrolysis.

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Dissolution-Induced Surface Roughening and Oxygen Evolution Electrocatalysis of Alkaline-Earth Iridates in Acid

Cited by 111 publications

References 55 publications

Reconstructed Water Oxidation Electrocatalysts: The Impact of Surface Dynamics on Intrinsic Activities

Reconstructed Water Oxidation Electrocatalysts: The Impact of Surface Dynamics on Intrinsic Activities

Perovskite‐Type Solid Solution Nano‐Electrocatalysts Enable Simultaneously Enhanced Activity and Stability for Oxygen Evolution

Recent Progress in Electrocatalysts for Acidic Water Oxidation

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