Please use this identifier to cite or link to this item: http://dx.doi.org/10.14279/depositonce-9658
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Main Title: Boosting water oxidation through in situ electroconversion of manganese gallide: an intermetallic precursor approach
Author(s): Menezes, Prashanth W.
Walter, Carsten
Hausmann, Jan Niklas
Beltrán-Suito, Rodrigo
Schlesiger, Christopher
Praetz, Sebastian
Yu. Verchenko, Valeriy
Shevelkov, Andrei V.
Drieß, Matthias
Type: Article
URI: https://depositonce.tu-berlin.de/handle/11303/10763
http://dx.doi.org/10.14279/depositonce-9658
License: https://creativecommons.org/licenses/by/4.0/
Abstract: For the first time, the manganese gallide (MnGa4) served as an intermetallic precursor, which upon in situ electroconversion in alkaline media produced high‐performance and long‐term‐stable MnOx‐based electrocatalysts for water oxidation. Unexpectedly, its electrocorrosion (with the concomitant loss of Ga) leads simultaneously to three crystalline types of MnOx minerals with distinct structures and induced defects: birnessite δ‐MnO2, feitknechtite β‐MnOOH, and hausmannite α‐Mn3O4. The abundance and intrinsic stabilization of MnIII/MnIV active sites in the three MnOx phases explains the superior efficiency and durability of the system for electrocatalytic water oxidation. After electrophoretic deposition of the MnGa4 precursor on conductive nickel foam (NF), a low overpotential of 291 mV, comparable to that of precious‐metal‐based catalysts, could be achieved at a current density of 10 mA cm−2 with a durability of more than five days.
Subject(s): electrocorrosion
MnOx minerals
oxygen evolution reaction
renewable energy
water-splitting electrocatalysts
Issue Date: 15-Oct-2019
Date Available: 13-Feb-2020
Language Code: en
DDC Class: 540 Chemie und zugeordnete Wissenschaften
Sponsor/Funder: DFG, 390540038, EXC 2008: UniSysCat
TU Berlin, Open-Access-Mittel - 2019
Journal Title: Angewandte Chemie International Edition
Publisher: Wiley
Volume: 58
Issue: 46
Publisher DOI: 10.1002/anie.201909904
Page Start: 16569
Page End: 16574
EISSN: 1521-3773
ISSN: 1433-7851
TU Affiliation(s): Fak. 2 Mathematik und Naturwissenschaften » Inst. Chemie » FG Metallorganische Chemie und Anorganische Materialien
Appears in Collections:Technische Universität Berlin » Publications

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