气候变化领域集成服务门户(CCPortal): Stabilizing the OOH∗ intermediate: Via pre-adsorbed surface oxygen of a single Ru atom-bimetallic alloy for ultralow overpotential oxygen generation

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DOI	10.1039/d0ee03183f
	Stabilizing the OOH∗ intermediate: Via pre-adsorbed surface oxygen of a single Ru atom-bimetallic alloy for ultralow overpotential oxygen generation
	Lee J.; Kumar A.; Yang T.; Liu X.; Jadhav A.R.; Park G.H.; Hwang Y.; Yu J.; Nguyen C.T.K.; Liu Y.; Ajmal S.; Kim M.G.; Lee H.
发表日期	2020
ISSN	17545692
起始页码	5152
结束页码	5164
卷号	13 期号:12
英文摘要	Designing efficient oxygen evolution reaction (OER) electrocatalysts based on single-atom catalysts is a highly promising option for cost-effective alkaline water electrolyzers. However, the instability of the OOH∗ intermediate and high energy barrier for the rate-determining step (RDS) (O∗ to OOH∗) on the pure bimetallic-alloy represent serious challenges. Here, we report atomically dispersed Ru single-atoms on a cobalt-iron bimetallic-alloy encapsulated by graphitic carbon (RuSACoFe2/G) as an efficient and durable electrocatalyst for the alkaline OER. In-depth X-ray absorption spectroscopy (XAS) and aberration-corrected transmission electron microscopy (AC-TEM) along with theoretical calculations were employed to validate the isolated Ru sites in the surface-oxygen rich alloy. RuSACoFe2/G displays exceptional intrinsic activity, achieving a record low overpotential of only 180 mV at 10 mA cm-2 with superior durability in alkali media. Density functional theory (DFT) simulations revealed that the isolated Ru sites with pre-adsorbed surface oxygen species on a bimetallic-alloy efficiently stabilize the OOH∗ intermediate and significantly reduce the energy barrier for the RDS, boosting the intrinsic OER activity. Our integrated alkaline electrolyzer demands a low cell voltage of 1.48 V at 10 mA cm-2, suggesting that it has potential for use in practical applications. This journal is © The Royal Society of Chemistry.
英文关键词	Atoms; Cobalt alloys; Cost effectiveness; Density functional theory; Electrocatalysts; Electrolytic cells; Energy barriers; High resolution transmission electron microscopy; Iron alloys; Oxygen evolution reaction; X ray absorption spectroscopy; Aberration-corrected; Graphitic carbons; Intermediate and high energies; Intrinsic activities; Oxygen evolution reaction (oer); Oxygen generation; Rate-determining step; Theoretical calculations; Ruthenium alloys; absorption; chemical alteration; hydroxide; molecular analysis; oxygen; ruthenium; stability analysis
语种	英语
来源期刊	Energy & Environmental Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/189449
作者单位	Center for Integrated Nanostructure Physics (CINAP), Institute for Basic Science (IBS), 2066 Seoburo, Jangan-gu, Suwon 16419, South Korea; Department of Chemistry, Sungkyunkwan University, 2066 Seoburo, Jangan-gu, Suwon 16419, South Korea; Beamline Research Division, Pohang Accelerator Laboratory (PAL), Pohang University of Science and Technology, Pohang, 37673, South Korea; Department of Biophysics, Sungkyunkwan University, 2066 Seoburo, Jangan-gu, Suwon 16419, South Korea
推荐引用方式 GB/T 7714	Lee J.,Kumar A.,Yang T.,et al. Stabilizing the OOH∗ intermediate: Via pre-adsorbed surface oxygen of a single Ru atom-bimetallic alloy for ultralow overpotential oxygen generation[J],2020,13(12).
APA	Lee J..,Kumar A..,Yang T..,Liu X..,Jadhav A.R..,...&Lee H..(2020).Stabilizing the OOH∗ intermediate: Via pre-adsorbed surface oxygen of a single Ru atom-bimetallic alloy for ultralow overpotential oxygen generation.Energy & Environmental Science,13(12).
MLA	Lee J.,et al."Stabilizing the OOH∗ intermediate: Via pre-adsorbed surface oxygen of a single Ru atom-bimetallic alloy for ultralow overpotential oxygen generation".Energy & Environmental Science 13.12(2020).