Cultivating crystal lattice distortion in IrO2via coupling with MnO2 to boost the oxygen evolution reaction with high intrinsic activity

Zhou, Zhenhua; Zaman, Waqas Qamar; Sun, Wei; Cao, Limei; Tariq, Muhammad; Yang, Jie

doi:10.1039/c8cc02008f

Cited by 80 publications

(54 citation statements)

References 30 publications

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“…2b, Supplementary Fig. 3 [32][33][34][35] ), respectively. The Cu 2 O-Pt intimate contact structure is further testified by STEM-EDS mapping ( Fig.…”

Section: Resultsmentioning

confidence: 94%

Direct and indirect Z-scheme heterostructure-coupled photosystem enabling cooperation of CO2 reduction and H2O oxidation

et al. 2020

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The stoichiometric photocatalytic reaction of CO 2 with H 2 O is one of the great challenges in photocatalysis. Here, we construct a Cu 2 O-Pt/SiC/IrO x composite by a controlled photodeposition and then an artificial photosynthetic system with Nafion membrane as diaphragm separating reduction and oxidation half-reactions. The artificial system exhibits excellent photocatalytic performance for CO 2 reduction to HCOOH and H 2 O oxidation to O 2 under visible light irradiation. The yields of HCOOH and O 2 meet almost stoichiometric ratio and are as high as 896.7 and 440.7 μmol g −1 h −1 , respectively. The high efficiencies of CO 2 reduction and H 2 O oxidation in the artificial system are attributed to both the direct Z-scheme electronic structure of Cu 2 O-Pt/SiC/IrO x and the indirect Z-scheme spatially separated reduction and oxidation units, which greatly prolong lifetime of photogenerated electrons and holes and prevent the backward reaction of products. This work provides an effective and feasible strategy to increase the efficiency of artificial photosynthesis.

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“…2b, Supplementary Fig. 3 [32][33][34][35] ), respectively. The Cu 2 O-Pt intimate contact structure is further testified by STEM-EDS mapping ( Fig.…”

Section: Resultsmentioning

confidence: 94%

Direct and indirect Z-scheme heterostructure-coupled photosystem enabling cooperation of CO2 reduction and H2O oxidation

et al. 2020

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“…The existing strategies can be classified into three major categories: (1) the introduction of specific components to generate composites, including those containing conductive and acid‐resistant materials as supports, alloys with nonprecious metals (Ni, Co, Cu, etc. ), core‐shell structures and various mixed metal oxide composites; (2) controlling special morphologies to create and expose additional active sites, such as two‐dimensional catalysts featuring ultrathin sheets, needles, or nanowires or three‐dimensional structures featuring abundant mesopores; (3) the formation of particular structures including amorphous IrO x , SrIrO 3 perovskite, SrTi 0.67 Ir 0.33 O 3 perovskite, Y 2 Ir 2 O 7 pyrochlore and Y 2 Ru 2 O 7‐δ pyrochlore . Despite these advances, the overpotential at 10 mA cm −2 is generally ∼300 mV and the catalysts are typically stable for less than 10 h. Their catalytic activity and stability can be even worse when Ir contents are reduced.…”

Section: Introductionmentioning

confidence: 99%

Iridium‐Chromium Oxide Nanowires as Highly Performed OER Catalysts in Acidic Media

et al. 2019

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The oxygen evolution reaction (OER) severely restricts the efficiency of electrolyzers due to its sluggish kinetics. In particular, only a few OER electrocatalysts, such as expensive and scarce iridium (Ir)-based materials, have been developed to function in acidic media. Therefore, the exploration of efficient and stable electrocatalysts with decreased precious metal content for the OER in acid is desired. Herein, chromium (Cr)incorporated IrO x solid solution nanowires not only exhibit high catalytic activity with a low overpotential of 250 mV at 10 mA cm À 2 , but also display robust catalytic performance without a decay in activity throughout 25 h of testing at 10 mA cm À 2 in 0.5 M H 2 SO 4 . This improved catalytic performance for the Cr-incorporated IrO x electrocatalysts is ascribed to an abundance of exposed active sites, tuned electronic states, optimized binding energy for intermediates on the catalyst surface and the consequent facile reaction kinetics.

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“…The IrO 6 distortion effect is, however, influenced by an increase in surface area. [22] A beneficial effect of Jahn-Teller distortion controlling the e g and t 2g orbital occupancy has been also reported for Cu-doped IrO 2 . [23] OER activity enhancement via support-catalysts effects were also reported for IrO 2 nanoparticles dispersed in TiO 2 .…”

Section: Acid Mediamentioning

confidence: 84%

Rationality in the new oxygen evolution catalyst development

Pittkowski

Krtil

Rossmeisl

2018

Current Opinion in Electrochemistry

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Anodic oxygen evolution has gained significant prominence in electrochemical research in the last decade in connection with renewable electricity storage. With water being the only available fossil free source of hydrogen, which is deemed the primary storage medium, the water electrolysis optimization is one of the biggest challenges of today's electrochemistry. A development of novel OER catalysts is motivated to increase the feasibility of the current OER catalysts in terms of activity, stability and price. This review summarizes the most recent synthetic approaches in OER catalyst synthesis for acid and alkaline electrolyzers stressing the structural aspects of the proposed catalysts. The reported novel catalyst approaches are aligned with existing theoretical and experiment based descriptors for rational of oxygen evolution activity improvement.

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Cultivating crystal lattice distortion in IrO₂via coupling with MnO₂ to boost the oxygen evolution reaction with high intrinsic activity

Cited by 80 publications

References 30 publications

Direct and indirect Z-scheme heterostructure-coupled photosystem enabling cooperation of CO2 reduction and H2O oxidation

Direct and indirect Z-scheme heterostructure-coupled photosystem enabling cooperation of CO2 reduction and H2O oxidation

Iridium‐Chromium Oxide Nanowires as Highly Performed OER Catalysts in Acidic Media

Rationality in the new oxygen evolution catalyst development

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