CoTiO3/NrGO nanocomposites for oxygen evolution and oxygen reduction reactions: Synthesis and electrocatalytic performance

被引：38
作者：
Luque-Centeno, J. M. [1 ,2 ]
Martinez-Huerta, M. V. [1 ]
Sebastian, D. [2 ]
Pardo, J. I. [3 ]
Lazaro, M. J. [2 ]
机构：
[1] CSIC, Inst Catalisis & Petroleoquim, Marie Curie 2, Madrid 28049, Spain
[2] CSIC, Inst Carboquim, Miguel Luesma Castan 4, Zaragoza 50018, Spain
[3] Univ Zaragoza, EINA, Aragon Inst Engn Res I3A, Grp Appl Thermodynam & Surfaces GATHERS, Zaragoza 50018, Spain
来源：
ELECTROCHIMICA ACTA | 2020年 / 331卷
关键词：
Oxygen evolution reaction; Oxygen reduction reaction; N-doped graphene; CoTiO3; Composites; Bifunctional; ELECTROSPUN CARBON NANOFIBERS; N-DOPED GRAPHENE; BIFUNCTIONAL ELECTROCATALYST; PHOTOCATALYTIC ACTIVITY; HIGHLY-EFFICIENT; WATER OXIDATION; RECENT PROGRESS; COBALT OXIDE; METAL-FREE; CATALYST;
D O I：
10.1016/j.electacta.2019.135396
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
Oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) catalysts play an important role in energy conversion and storage devices, but highly active and robust nonprecious metal catalysts are required to address the cost and durability issues. In this work, a modified gel methodology has been used to obtain nanocomposites of perovskite CoTiO3 and N-doped reduced graphene oxide (NrGO). Moreover, the influence of the annealing extent in the synthesis has been studied. The composites show higher activity in oxygen evolution and reduction reactions in alkaline environment compared to sole ilmenite, which is related to a strong interaction between cobalt titanate and NrGO carbon matrix. The annealing duration appears as a key variable to modulate the physicochemical properties and the electrochemical behavior. The composite prepared at the largest duration (3 h) exhibit enhanced bifunctional properties for ORR and OER, with onset potentials of 0.93 V and 1.53 V vs. RHE respectively, which is mainly attributed to higher concentration of nitrogen, larger extent of defects and/or the presence of more oxidized Co species in the nanocomposite. (c) 2019 Elsevier Ltd. All rights reserved.
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页数：11
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