Sugar-based catalysts for oxygen reduction reaction. Effects of the functionalization of the nitrogen precursors on the electrocatalytic activity

被引：15

作者：

Longhi, Mariangela ^{[1
]}

Marzorati, Stefania ^{[1
]}

Checchia, Stefano ^{[1
]}

Sacchi, Benedetta ^{[1
]}

Santo, Nadia ^{[2
]}

Zaffino, Chiara ^{[1
]}

Scavini, Marco ^{[1
]}

机构：

[1] Univ Milan, Dipartimento Chim, Via Golgi 19, I-20133 Milan, Italy

[2] Univ Milan, Dipartimento Biosci, Via Celoria 26, I-20133 Milan, Italy

来源：

ELECTROCHIMICA ACTA | 2016年 / 222卷

关键词：

Oxygen Reduction Reaction; Pt-free Catalysts; Sugar-based Carbons; Functionalization of nitrogen precursors; Carbon local structure; ORR Mechanism; CONTAINING CARBON CATALYSTS; FUEL-CELL DURABILITY; SURFACE-CHEMISTRY; O-2; REDUCTION; IRON; ELECTROLYTE; SITES; COORDINATION; NANOPARTICLES; PLATINUM;

D O I：

10.1016/j.electacta.2016.11.036

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Non-noble metal catalysts for the electrochemical reduction of oxygen (ORR) in acidic and alkaline solutions have been produced by pyrolysis of a silica gel containing fructose, as a carbon source, and derivatives of guanidine, as nitrogen compounds. The importance of the formation of iron complexes with nitrogen precursors to obtain good oxygen reduction reaction (ORR) catalysts has been investigated by varying the functionalization of guanidine derivatives. The presence of secondary or tertiary amines on guanidine limits or hinders the formation of iron complexes and, as a result, the produced materials are not very active. Conversely, the presence of primary amines promotes the formation of iron complexes, and, during the pyrolysis, of iron nanoparticles and ordered graphitic planes, making the final material very active for ORR. An explanation of this behavior in terms of surface and bulk composition has been proposed. An attempt to find the ORR rate determining step for the samples in both alkaline and acidic solutions has been done. (C) 2016 Elsevier Ltd. All rights reserved.

引用

页码：781 / 792

页数：12

共 71 条

[21]

Greeley J, 2009, NAT CHEM, V1, P552, DOI [10.1038/nchem.367, 10.1038/NCHEM.367]

[22] Two-dimensional detector software: From real detector to idealised image or two-theta scan [J].