BROWSE

Related Scientist

nanomat's photo.

nanomat
나노입자연구단
more info

ITEM VIEW & DOWNLOAD

A new water oxidation catalyst: Lithium manganese pyrophosphate with tunable mn valency

Cited 97 time in webofscience Cited 96 time in scopus
1,426 Viewed 256 Downloaded
Title
A new water oxidation catalyst: Lithium manganese pyrophosphate with tunable mn valency
Author(s)
Park J.; Kim H.; Jin K.; Lee B.J.; Park Y.-S.; Kim H.; Park I.; Yang K.D.; Jeong H.-Y.; Kim J.; Hong K.T.; Jang H.W.; Kisuk Kang; Nam, Ki Tae
Subject
Catalysis, ; Catalysts, ; Catalytic oxidation, ; Cyclic voltammetry, ; Inductively coupled plasma mass spectrometry, ; Lithium, ; Manganese, ; Manganese oxide, ; Oxidation, ; Photoelectrons, ; X ray photoelectron spectroscopy, ; Atomic arrangement, ; Catalytic capability, ; Catalytic performance, ; Catalytic stability, ; Mn-based catalysts, ; Neutral conditions, ; Water oxidation catalysts, ; X-ray absorption near-edge structure, ; Manganese removal (water treatment), ; lithium, ; lithium manganese pyrophosphate, ; manganese, ; manganese (iii), ; pyrophosphate, ; unclassified drug, ; water, ; article, ; catalysis, ; catalyst, ; conductance, ; crystal structure, ; cyclic potentiometry, ; electrochemical analysis, ; electrolysis, ; electrostimulation, ; Fourier transformation, ; mass spectrometry, ; oxidation kinetics, ; oxidation reduction potential, ; oxygen evolution, ; polarization, ; steady state, ; water oxidation catalyst, ; X ray absorption spectroscopy, ; X ray photoelectron spectroscopy
Publication Date
2014-03
Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, v.136, no.11, pp.4201 - 4211
Publisher
AMER CHEMICAL SOC
Abstract
The development of a water oxidation catalyst has been a demanding challenge for the realization of overall water-splitting systems. Although intensive studies have explored the role of Mn element in water oxidation catalysis, it has been difficult to understand whether the catalytic capability originates mainly from either the Mn arrangement or the Mn valency. In this study, to decouple these two factors and to investigate the role of Mn valency on catalysis, we selected a new pyrophosphate-based Mn compound (Li 2MnP2O7), which has not been utilized for water oxidation catalysis to date, as a model system. Due to the monophasic behavior of Li2MnP2O7 with delithiation, the Mn valency of Li2-xMnP2O7 (x = 0.3, 0.5, 1) can be controlled with negligible change in the crystal framework (e.g., volume change ∼1%). Moreover, inductively coupled plasma mass spectrometry, X-ray photoelectron spectroscopy, ex-situ X-ray absorption near-edge structure, galvanostatic charging-discharging, and cyclic voltammetry analysis indicate that Li2-xMnP2O7 (x = 0.3, 0.5, 1) exhibits high catalytic stability without additional delithiation or phase transformation. Notably, we observed that, as the averaged oxidation state of Mn in Li2-xMnP2O7 increases from 2 to 3, the catalytic performance is enhanced in the series Li2MnP 2O7 < Li1.7MnP2O7 < Li1.5MnP2O7 < LiMnP2O 7. Moreover, Li2MnP2O7 itself exhibits superior catalytic performance compared with MnO or MnO2. Our study provides valuable guidelines for developing an efficient Mn-based catalyst under neutral conditions with controlled Mn valency and atomic arrangement. © 2014 American Chemical Society.
URI
https://pr.ibs.re.kr/handle/8788114/1093
DOI
10.1021/ja410223j
ISSN
0002-7863
Appears in Collections:
Center for Nanoparticle Research(나노입자 연구단) > 1. Journal Papers (저널논문)
Files in This Item:
A New Water Oxidation Catalyst Lithium Manganese Pyrophosphate with Tunable Mn Valency.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