BROWSE

Related Scientist

CINAP's photo.

CINAP
나노구조물리 연구단
more info

ITEM VIEW & DOWNLOAD

Stabilizing the OOH* intermediate via pre-adsorbed surface oxygen of a single Ru atom-bimetallic alloy for ultralow overpotential oxygen generation

Cited 0 time in webofscience Cited 0 time in scopus
29 Viewed 0 Downloaded
Title
Stabilizing the OOH* intermediate via pre-adsorbed surface oxygen of a single Ru atom-bimetallic alloy for ultralow overpotential oxygen generation
Author(s)
Jinsun Lee; Ashwani Kumar; Taehun Yang; Xinghui Liu; Amol R Jadhav; G. Hwan Park; Yosep Hwang; Jianmin Yu; Chau TK Nguyen; Yang Liu; Sara Ajmal; Min Gyu Kim; Hyoyoung Lee
Publication Date
2020-12
Journal
Energy and Environmental Sciences, v.13, no.12, pp.5152 - 5164
Publisher
Royal Society of Chemistry
Abstract
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. RuSACoFe(2)/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.
URI
https://pr.ibs.re.kr/handle/8788114/9106
DOI
10.1039/d0ee03183f
ISSN
1754-5692
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > 1. Journal Papers (저널논문)
Files in This Item:
There are no files associated with this item.

qrcode

  • facebook

    twitter

  • Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.
해당 아이템을 이메일로 공유하기 원하시면 인증을 거치시기 바랍니다.

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

Browse