Journal ArticleDOI
A perovskite oxide optimized for oxygen evolution catalysis from molecular orbital principles.
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TLDR
The high activity of BSCF was predicted from a design principle established by systematic examination of more than 10 transition metal oxides, which showed that the intrinsic OER activity exhibits a volcano-shaped dependence on the occupancy of the 3d electron with an eg symmetry of surface transition metal cations in an oxide.Abstract:
The efficiency of many energy storage technologies, such as rechargeable metal-air batteries and hydrogen production from water splitting, is limited by the slow kinetics of the oxygen evolution reaction (OER). We found that Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3–δ (BSCF) catalyzes the OER with intrinsic activity that is at least an order of magnitude higher than that of the state-of-the-art iridium oxide catalyst in alkaline media. The high activity of BSCF was predicted from a design principle established by systematic examination of more than 10 transition metal oxides, which showed that the intrinsic OER activity exhibits a volcano-shaped dependence on the occupancy of the 3d electron with an e g symmetry of surface transition metal cations in an oxide. The peak OER activity was predicted to be at an e g occupancy close to unity, with high covalency of transition metal–oxygen bonds.read more
Citations
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Why Is Bulk Thermochemistry a Good Descriptor for the Electrocatalytic Activity of Transition Metal Oxides
TL;DR: In this article, the authors explain the success of this descriptor on the basis of perovskite oxides and monoxides and the oxygen evolution reaction: essentially, bulk thermochemistry and surface adsorption energetics depend similarly on the number of outer electrons of the transition metal in the oxide.
Journal ArticleDOI
Enhanced oxygen evolution activity by NiOx and Ni(OH)2 nanoparticles
Lucas-Alexandre Stern,Xile Hu +1 more
TL;DR: Small nanoparticles of nickel oxide and nickel hydroxide were investigated for the oxygen evolution reaction (OER) in alkaline solutions and showed excellent catalytic activity, comparable to that of the best mixed metal oxide catalysts under the same conditions.
Journal ArticleDOI
Elucidating Hydrogen Oxidation/Evolution Kinetics in Base and Acid by Enhanced Activities at the Optimized Pt Shell Thickness on the Ru Core
Katherine C. Elbert,Jue Hu,Zhong Ma,Yu Zhang,Guangyu Chen,Wei An,Ping Liu,Hugh S. Isaacs,Radoslav R. Adzic,Jia X. Wang +9 more
TL;DR: In this paper, a 4-fold enhancement of Pt mass activity was achieved using single-crystalline Ru@Pt coreshell nanoparticles with two-monolayer-thick Pt shells, which doubled the activity on Pt-Ru alloy nanocatalysts.
Journal ArticleDOI
Na-doped ruthenium perovskite electrocatalysts with improved oxygen evolution activity and durability in acidic media
Maria Retuerto,Laura Pascual,Federico Calle-Vallejo,Pilar Ferrer,Diego Gianolio,Amaru González Pereira,Álvaro López García,Jorge Torrero,María Teresa Fernández-Díaz,Peter Bencok,Miguel A. Peña,José Luis García Fierro,Sergio Rojas +12 more
TL;DR: Sodium doping of strontium ruthenate is shown to improve the catalytic durability while maintaining a high O2 evolution activity and illustrates how high OER activity and durability can be simultaneously engineered by chemical doping of perovskites.
Journal ArticleDOI
Graphene-like holey Co3O4 nanosheets as a highly efficient catalyst for oxygen evolution reaction
Yuhai Dou,Yuhai Dou,Yuhai Dou,Ting Liao,Ting Liao,Zongqing Ma,Dongliang Tian,Qiannan Liu,Feng Xiao,Ziqi Sun,Jung Ho Kim,Shi Xue Dou +11 more
TL;DR: In this paper, a bottom-up self-assembly approach was used to synthesize Co3O4 nanosheets with a graphene-like holey structure for the oxygen evolution reaction (OER).
References
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Building better batteries
TL;DR: Researchers must find a sustainable way of providing the power their modern lifestyles demand to ensure the continued existence of clean energy sources.
Journal ArticleDOI
Powering the planet: Chemical challenges in solar energy utilization
Nathan S. Lewis,Daniel G. Nocera +1 more
TL;DR: Solar energy is by far the largest exploitable resource, providing more energy in 1 hour to the earth than all of the energy consumed by humans in an entire year, and if solar energy is to be a major primary energy source, it must be stored and dispatched on demand to the end user.
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Activity benchmarks and requirements for Pt, Pt-alloy, and non-Pt oxygen reduction catalysts for PEMFCs
TL;DR: In this article, the authors quantified the activities and voltage loss modes for state-of-the-art MEAs (membrane electrode assemblies), specifies performance goals needed for automotive application, and provides benchmark oxygen reduction activities for state of the art platinum electrocatalysts.
Journal ArticleDOI
Improved Oxygen Reduction Activity on Pt3Ni(111) via Increased Surface Site Availability
Vojislav R. Stamenkovic,Vojislav R. Stamenkovic,Ben Fowler,Bongjin Simon Mun,Guofeng Wang,Philip N. Ross,Chris Lucas,Nenad M. Markovic +7 more
TL;DR: It is demonstrated that the Pt3Ni( 111) surface is 10-fold more active for the ORR than the corresponding Pt(111) surface and 90-foldMore active than the current state-of-the-art Pt/C catalysts for PEMFC.
Journal ArticleDOI
In Situ Formation of an Oxygen-Evolving Catalyst in Neutral Water Containing Phosphate and Co2+
TL;DR: A catalyst that forms upon the oxidative polarization of an inert indium tin oxide electrode in phosphate-buffered water containing cobalt (II) ions is reported that not only forms in situ from earth-abundant materials but also operates in neutral water under ambient conditions.