BROWSE

Related Scientist

nanomat's photo.

nanomat
나노입자연구단
more info

ITEM VIEW & DOWNLOAD

Amorphous multinary phyllosilicate catalysts for electrochemical water oxidation

Cited 0 time in webofscience Cited 0 time in scopus
731 Viewed 312 Downloaded
Title
Amorphous multinary phyllosilicate catalysts for electrochemical water oxidation
Author(s)
Byunghoon Kim; Kim J.S.; Hyunah Kim; Park I.; Won Mo Seong; Kisuk Kang
Publication Date
2019-08
Journal
JOURNAL OF MATERIALS CHEMISTRY A, v.7, no.31, pp.18380 - 18387
Publisher
ROYAL SOC CHEMISTRY
Abstract
© The Royal Society of Chemistry 2019.The practical realization of a water-splitting system necessitates the development of high-performance oxygen evolution reaction (OER) catalysts. Despite tremendous research efforts aimed at identifying earth-abundant 3d transition-metal-based catalysts, their insufficient catalytic efficiencies continue to jeopardize their real-world application. Herein, we introduce amorphous cobalt-iron phyllosilicates (ACFPs) as highly efficient OER catalysts. The ACFPs were designed by tailoring the metal chemistry of the phyllosilicate framework which consists of laminations of silicate (SiO4) layers and layered Co-Fe (oxy)hydroxide motifs, and prepared using a facile room-temperature precipitation method. It is demonstrated that the OER properties/mechanisms are sensitively affected by the Co/Fe ratio, with an exceptionally low overpotential (η ∼ 329 mV for a current density of 10 mA cm-2) delivered at the optimized composition of 40 at% Fe. This catalytic efficiency is greater than that of the structurally analogous Co-Fe (oxy)hydroxide as well as those of pure Co or Fe phyllosilicate, suggesting the beneficial role of the phyllosilicate framework along with the synergistic interplay of Co and Fe ions in the framework. Density functional theory calculations revealed that the introduction of Fe at the surface of Co phyllosilicate perturbs the local structural environment of oxygen sites, providing additional active sites. This work proposes a valid strategy for the design of high-performance catalysts by chemically tuning both the redox-active and redox-inert elements concomitantly in novel multinary phyllosilicate-based OER catalysts
URI
https://pr.ibs.re.kr/handle/8788114/6896
DOI
10.1039/c9ta05599a
ISSN
2050-7488
Appears in Collections:
Center for Nanoparticle Research(나노입자 연구단) > 1. Journal Papers (저널논문)
Files in This Item:
Amorphous multinary phyllosilicate catalysts for electrochemical water oxidation.pdfDownload

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