Non‐Fermi Liquids as Highly Active Oxygen Evolution Reaction Catalysts

Hirai, Shigeto; Yagi, Shunsuke; Chen, Wei-Tin; Chou, F. C.; Okazaki, Noriyasu; Ohno, Tomoya; Suzuki, Hisao; Matsuda, Takeshi

doi:10.1002/advs.201700176

Cited by 35 publications

(29 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…However, we note that the reported OER activity and durability of RuO 2 based electrocatalysts in acidic solution is still much lower than that in basic solution, hence, unable to meet the requirement of replacing alkaline electrolyzer. [6b,c,7] Thus, elaborate design of RuO 2 ‐based catalysts to further improve acidic OER activity is highly desirable.…”

Section: Methodsmentioning

confidence: 99%

Assembling Ultrasmall Copper‐Doped Ruthenium Oxide Nanocrystals into Hollow Porous Polyhedra: Highly Robust Electrocatalysts for Oxygen Evolution in Acidic Media

et al. 2018

View full text Add to dashboard Cite

Here, a facile and novel strategy for the preparation of Cu-doped RuO hollow porous polyhedra composed of ultrasmall nanocrystals through one-step annealing of a Ru-exchanged Cu-BTC derivative is reported. Owing to the optimized surface configuration and altered electronic structure, the prepared catalyst displays a remarkable oxygen evolution reaction (OER) performance with low overpotential of 188 mV at 10 mA cm in acidic electrolyte, an ultralow Tafel slope of 43.96 mV dec , and excellent stability in durability testing for 10 000 cycles, and continuous testing of 8 h at a current density of 10 mA cm . Density functional theory calculations reveal that the highly unsaturated Ru sites on the high-index facets can be oxidized gradually and reduce the energy barrier of rate-determining steps. On the other hand, the Cu dopants can alter the electronic structures so as to further improve the intrinsic OER activity.

show abstract

Section: Methodsmentioning

confidence: 99%

Assembling Ultrasmall Copper‐Doped Ruthenium Oxide Nanocrystals into Hollow Porous Polyhedra: Highly Robust Electrocatalysts for Oxygen Evolution in Acidic Media

et al. 2018

View full text Add to dashboard Cite

show abstract

“…However, the obtained OER descriptor of e g ≈ 1 on the d-orbital manifold of M n+ ions in AMO 3 perovskites for their excellent OER activity is challenged by the good OER on 4d/5d-transition-metal-oxide catalysts with zero antibonding e g electrons such as IrO 2 and Hg 2 Ru 2 O 7 (24)(25)(26)(27). In addition to the OER activity, the stability and the preparation condition of the catalysts are two other critical parameters for their large-scale application.…”

Section: Significance Statementmentioning

confidence: 99%

Short O–O separation in layered oxide Na _0.67 CoO ₂ enables an ultrafast oxygen evolution reaction

Wang

Dolocan

et al. 2019

Proc. Natl. Acad. Sci. U.S.A.

View full text Add to dashboard Cite

The layered oxide Na0.67CoO2 with Na+ occupying trigonal prismatic sites between CoO2 layers exhibits a remarkably high room temperature oxygen evolution reaction (OER) activity in alkaline solution. The high activity is attributed to an unusually short O–O separation that favors formation of peroxide ions by O−–O– interactions followed by O2 evolution in preference to the conventional route through surface O–OH– species. The dependence of the onset potential on the pH of the alkaline solution was found to be consistent with the loss of H+ ions from the surface oxygen to provide surface O− that may either be attacked by solution OH− or react with another O−; a short O–O separation favors the latter route. The role of a strong hybridization of the O–2p and low-spin CoIII/CoIV π-bonding d states is also important; the OER on other CoIII/CoIV oxides is compared with that on Na0.67CoO2 as well as that on IrO2.

show abstract

“…Transition metal oxides consisting of nonprecious metal elements in various structure types such as perovskite, − spinel, , and pyrochlore − are considered as promising candidates for OER and ORR catalysts owing to their flexibility in chemical compositions and electronic states. In particular, a wide range of perovskite and related oxides have been extensively investigated to increase catalytic performance. ,,− Recently, multielement transition-metal perovskite oxides like Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3−δ (BSCF), La 1– x Sr x CoO 3−δ , and Sr(Co 0.7 Fe 0.2 Nb 0.1 )O 3−δ were proposed as highly active OER catalysts. ,− Positive interactions between constituent elements to increase catalytic activity are interpreted as synergistic effects. − State-of-the-art techniques revealed new insights into OER mechanisms concerning lattice-oxygen activation and electron transfer in these oxides. , However, most transition metal oxide catalysts ever studied are involved in severe structure randomness derived from off-stoichiometry (see a structure model of BSCF in Figure a drawn by using the VESTA-3 software), in addition to unobvious electronic state of each constituent ion in mixed state.…”

Section: Introductionmentioning

confidence: 99%

Synergistically Enhanced Oxygen Evolution Reaction Catalysis for Multielement Transition-Metal Oxides

Yamada

Takamatsu

Asai

et al. 2018

ACS Appl. Energy Mater.

View full text Add to dashboard Cite

Transition metal oxides have been extensively investigated as novel catalysts for oxygen evolution reaction (OER). Partial elemental substitutions are effective ways to increase catalytic performance and such electronic interactions between multiple elements are known as synergistic effects. However, serious issues such as random atomic arrangement and ambiguous roles of constituent elements humper theoretical investigations for rational materials design. Herein, we describe systematic study on OER activity of AA′ 3 B 4 O 12 -type quadruple perovskite oxides, in which multiple transition metal ions are located at distinct crystallographic sites. Electrochemical measurements demonstrate that OER catalytic activities of quadruple perovskite oxide series, CaCu 3 B 4 O 12 (B = Ti, V, Cr, Mn, Fe, and Co), are all superior to those of simple perovskite counterparts CaBO 3 . The order of activity of B-site transition metal ions for CaBO 3 (Fe 4+ > Co 4+ ≫ Ti 4+ , V 4+ , Cr 4+ , Mn 4+ ) is retained in CaCu 3 B 4 O 12 , indicating that B-site ions play a primary role whereas A′-site Cu ions secondarily contribute to OER activity for CaCu 3 B 4 O 12 . Charge-transfer energies, energy differences between oxygen 2p band center and unoccupied 3d band center of B-site transition metal obtained from first-principles electronic-state calculations, illustrate that OER overpotentials of quadruple perovskite oxides are lower than simple perovskite oxides by ∼150 mV. These findings propose a simple avenue to realize enhanced OER activity for multiple transition-metal ions.

show abstract

Non‐Fermi Liquids as Highly Active Oxygen Evolution Reaction Catalysts

Cited by 35 publications

References 42 publications

Assembling Ultrasmall Copper‐Doped Ruthenium Oxide Nanocrystals into Hollow Porous Polyhedra: Highly Robust Electrocatalysts for Oxygen Evolution in Acidic Media

Assembling Ultrasmall Copper‐Doped Ruthenium Oxide Nanocrystals into Hollow Porous Polyhedra: Highly Robust Electrocatalysts for Oxygen Evolution in Acidic Media

Short O–O separation in layered oxide Na _0.67 CoO ₂ enables an ultrafast oxygen evolution reaction

Synergistically Enhanced Oxygen Evolution Reaction Catalysis for Multielement Transition-Metal Oxides

Contact Info

Product

Resources

About

Non‐Fermi Liquids as Highly Active Oxygen Evolution Reaction Catalysts

Cited by 35 publications

References 42 publications

Assembling Ultrasmall Copper‐Doped Ruthenium Oxide Nanocrystals into Hollow Porous Polyhedra: Highly Robust Electrocatalysts for Oxygen Evolution in Acidic Media

Assembling Ultrasmall Copper‐Doped Ruthenium Oxide Nanocrystals into Hollow Porous Polyhedra: Highly Robust Electrocatalysts for Oxygen Evolution in Acidic Media

Short O–O separation in layered oxide Na 0.67 CoO 2 enables an ultrafast oxygen evolution reaction

Synergistically Enhanced Oxygen Evolution Reaction Catalysis for Multielement Transition-Metal Oxides

Contact Info

Product

Resources

About

Short O–O separation in layered oxide Na _0.67 CoO ₂ enables an ultrafast oxygen evolution reaction