Cobalt metalloid and polybenzoxazine derived composites for bifunctional oxygen electrocatalysis

被引：15

作者：

Barwe, Stefan ^{[1
]}

Andronescu, Corina ^{[1
]}

Engels, Ruben ^{[1
]}

Conzuelo, Felipe ^{[1
]}

Seisel, Sabine ^{[1
]}

Wilde, Patrick ^{[1
]}

Chen, Yen-Ting ^{[1
]}

Masa, Justus ^{[1
]}

Schuhmann, Wolfgang ^{[1
]}

机构：

[1] Ruhr Univ Bochum, Fac Chem & Biochem, CES, Analyt Chem, Univ Str 150, D-44780 Bochum, Germany

来源：

ELECTROCHIMICA ACTA | 2019年 / 297卷

关键词：

Electrocatalysis; Oxygen evolution reaction; Oxygen reduction reaction; Energy conversion; Metal metalloid compound; N-DOPED CARBON; AIR BATTERIES; ELECTROCHEMICAL REDUCTION; PHOSPHIDE; EVOLUTION; CO; NANOPARTICLES; CATALYST; GRAPHENE; HYDROGEN;

D O I：

10.1016/j.electacta.2018.12.047

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The development of bifunctional oxygen electrodes is a key factor for the envisaged application of rechargeable metal-air batteries. In this work, we present a simple procedure based on pyrolysis of polybenzoxazine/metal metalloid nanoparticles composites into efficient bifunctional oxygen reduction and oxygen evolution electrocatalysts. This procedure generates nitrogen-doped carbon with embedded metal metalloid nanoparticles exhibiting high activity towards both, oxygen reduction and oxygen evolution, in 0.1 M KOH with a roundtrip voltage of as low as 0.81 V. Koutecky-Levich analysis coupled with scanning electrochemical microscopy reveals that oxygen is preferentially reduced in a 4e(-) transfer pathway to hydroxide rather than to hydrogen peroxide. Furthermore, the polybenzoxazine derived carbon matrix allows for stable catalyst fixation on the electrode surface, resulting in unattenuated activity during continuous alternate polarisation between oxygen evolution at 10 mA cm(-2) and oxygen reduction at -1.0 mA cm(-2). (C) 2018 Elsevier Ltd. All rights reserved.

引用

页码：1042 / 1051

页数：10

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