High-Performance Pyrochlore-Type Yttrium Ruthenate Electrocatalyst for Oxygen Evolution Reaction in Acidic Media

Kim, Jaemin; Shih, Pei Chieh; Tsao, Kai Chieh; Pan, Yung‐Tin; Yin, Xi; Sun, Cheng; Yang, Hong

doi:10.1021/jacs.7b06808

Cited by 361 publications

(390 citation statements)

References 55 publications

(92 reference statements)

Supporting

Mentioning

361

Contrasting

Order By: Relevance

“…To confirm the alloying of Co and Ru, Ru K‐edge XANES and EXAFS spectra of YRCO‐X were also investigated. YRCO, YRCO‐510, and YRCO‐560 exhibited the overlapped two peaks at the photon energy of 22 138 and 22 150 eV derived from the bound and continuum of dipole‐allowed transition from Ru 1s to 5p and, Ru–O and Ru–Ru bonds at reduced distances of 1.52 and 3.22 Å derived from the B‐sites pyrochlore oxide structure (Figure c,d) . The analogous shape of YRCO‐510 and YRCO‐560 in XANES and EXAFS spectra to YRCO represents that pyrochlore oxide structure maintains well and the reduction of Ru cations does not occur over the temperature of 510–560 °C.…”

mentioning

confidence: 79%

Reducing the Barrier Energy of Self‐Reconstruction for Anchored Cobalt Nanoparticles as Highly Active Oxygen Evolution Electrocatalyst

Kim

Lee

et al. 2019

Advanced Materials

View full text Add to dashboard Cite

performance can be limited due to the slow oxidation kinetics and consequent low degree formation of MOOH intermediates. [16,17] As such, the matter of 3D transition metals in OER activity may come down to their facile oxidation, referring to the necessity of novel structural design to tune the oxidation kinetics. Recently, heterogeneous catalysts-supported metals have shown notable OER activities resulting from the similarity of metal crystallite to support materials and catalytic synergy of support species support to the 3D metal. [18] The synergistic effect refers to modification of electronic structures of both support materials and anchored metals, which leads to the acceleration of oxidation kinetics of the anchored metal. [19] This infers that the introduction of conductive support for transition metals could help to readily transport electrons from the transition metal particles to support materials. Pyrochlore oxides (A 2 B 2 O 7 ) have a characteristic that electrons generated during oxygen evolution (4OH − → O 2 + 2H 2 O + 4e − ) are rapidly transferred from surface to inner layers with low-resistance pathway by oxidizing either A or B-site metal cation of pyrochlore oxide. [20][21][22][23][24][25] As such, the metallic conduction pyrochlore oxide can be a suitable support for transition metals, which provide a rationale for transitionmetal anchored pyrochlore oxide for OER. In the integrated design of transition metals and pyrochlore oxides, the pyrochlore oxide support effectively transfer the electrons generated during the oxidation of transition metal to pyrochlore oxide inner layers, reducing the barrier energy for the formation of MOOH intermediates.For the synthesis of metal-supported heterogeneous structure, in situ exsolution method is widely adopted in that metal nanoparticles are uniformly grown on support materials. [26][27][28][29][30] Recently, CoFe nanoalloys decorated on La 2 O 3 has been reported where the CoFe alloy particle is formed by the reduction of Co and Fe cations from LaCo 0.8 Fe 0.2 O 3−δ perovskite oxide. [31] The CoFe/La 2 O 3 catalyst showed notable OER potential of 1.52 V versus RHE at the current density of 10 mA cm −2 in alkaline medium, showing the transformation of CoFe nanoalloys to (Co/Fe)O(OH) intermediation. However, the OER active sites of the CoFe/La 2 O 3 only come from the CoFe nanoalloys, for the perovskite oxide (ABO 3 ) support are transformed to OER inactive metal oxide (i.e., La 2 O 3 ). The reduction of all the Co It is crucial for leaping forward renewable energy technology to develop highly active oxygen evolution reaction (OER) catalysts with fast OER kinetics, and the novel design of high-performance catalysts may come down to unveiling the origin of high catalytic behavior. Herein, a new class of heterogeneous OER electrocatalyst (metallic Co nanoparticles anchored on yttrium ruthenate pyrochlore oxide) is provided for securing fast OER kinetics. In situ X-ray absorption spectroscopy (in situ XAS) reveals that fast OER kinetics can be achieved by t...

show abstract

mentioning

confidence: 79%

Reducing the Barrier Energy of Self‐Reconstruction for Anchored Cobalt Nanoparticles as Highly Active Oxygen Evolution Electrocatalyst

Kim

Lee

et al. 2019

Advanced Materials

View full text Add to dashboard Cite

show abstract

“…Notably, the corrosion of RuO 2 during long‐time operation limits its future application. Fabricating bimetallic oxides (i.e., SrRuO 3 and Y 2 Ru 2 O 7− δ ) and constructing a core–shell structure (i.e., IrO 2 @RuO 2 ) are efficient strategies for improving the stability of RuO 2 catalyst. This core–shell structure can not only lower the overpotential but also enhance the stability up to 1000 cycles with 96.7% remaining …”

Section: Heterogeneous Water Oxidation Catalystsmentioning

confidence: 99%

Water Oxidation Catalysts for Artificial Photosynthesis

et al. 2019

View full text Add to dashboard Cite

Water oxidation is the primary reaction of both natural and artificial photosynthesis. Developing active and robust water oxidation catalysts (WOCs) is the key to constructing efficient artificial photosynthesis systems, but it is still facing enormous challenges in both fundamental and applied aspects. Here, the recent developments in molecular catalysts and heterogeneous nanoparticle catalysts are reviewed with special emphasis on biomimetic catalysts and the integration of WOCs into artificial photosystems. The highly efficient artificial photosynthesis depends largely on active WOCs integrated into light harvesting materials via rational interface engineering based on in‐depth understanding of charge dynamics and the reaction mechanism.

show abstract

“…[4a,b] Ruthenium and iridium metals and their oxides are the best OER catalysts that show good stabilities in acidic environments. Y 2 Ru 2 O 7-δ , [13] and IrO x /SrIrO 3 . [8,9] Therefore, there have been ongoing efforts to discover new iridium and rutheniumbased OER catalysts with similar or improved catalytic activities, yet at reduced precious metal content.…”

Section: Introductionmentioning

confidence: 99%

Ruthenium Oxide Nanosheets for Enhanced Oxygen Evolution Catalysis in Acidic Medium

Laha

Lee

Podjaski

et al. 2019

Advanced Energy Materials

153

147

View full text Add to dashboard Cite

The fabrication of highly active and robust hexagonal ruthenium oxide nanosheets for the electrocatalytic oxygen evolution reaction (OER) in an acidic environment is reported. The ruthenate nanosheets exhibit the best OER activity of all solution‐processed acid medium electrocatalysts reported to date, reaching 10 mA cm−2 at an overpotential of only ≈255 mV. The nanosheets also demonstrate robustness under harsh oxidizing conditions. Theoretical calculations give insights into the OER mechanism and reveal that the edges are the origin of the high OER activity of the nanosheets. Moreover, the post OER analyses indicate, apart from coarsening, no observable change in the morphology of the nanosheets or oxidation states of ruthenium during the electrocatalytic process. Therefore, the present investigation suggests that ruthenate nanosheets are a promising acid medium OER catalyst with application potential in proton exchange membrane electrolyzers and beyond.

show abstract

High-Performance Pyrochlore-Type Yttrium Ruthenate Electrocatalyst for Oxygen Evolution Reaction in Acidic Media

Cited by 361 publications

References 55 publications

Reducing the Barrier Energy of Self‐Reconstruction for Anchored Cobalt Nanoparticles as Highly Active Oxygen Evolution Electrocatalyst

Reducing the Barrier Energy of Self‐Reconstruction for Anchored Cobalt Nanoparticles as Highly Active Oxygen Evolution Electrocatalyst

Water Oxidation Catalysts for Artificial Photosynthesis

Ruthenium Oxide Nanosheets for Enhanced Oxygen Evolution Catalysis in Acidic Medium

Contact Info

Product

Resources

About