Crystal structure and surface characteristics of Sr-doped GdBaCo2O6-δ double perovskites: oxygen evolution reaction and conductivity

被引：41

作者：

Pramana, Stevin S. ^{[1
,2
]}

Cavallaro, Andrea ^{[1
]}

Li, Cheng ^{[1
]}

Handoko, Albertus D. ^{[3
,4
]}

Chan, Kuang Wen ^{[3
]}

Walker, Robert J. ^{[1
]}

Regoutz, Anna ^{[1
]}

Herrin, Jason S. ^{[5
]}

Yeo, Boon Siang ^{[3
]}

Payne, David J. ^{[1
]}

Kilner, John A. ^{[1
,6
]}

Ryan, Mary P. ^{[1
]}

Skinner, Stephen J. ^{[1
]}

机构：

[1] Imperial Coll London, Dept Mat, Exhibit Rd, London SW7 2AZ, England

[2] Newcastle Univ, Sch Engn, Newcastle Upon Tyne NE1 7RU, Tyne & Wear, England

[3] Natl Univ Singapore, Dept Chem, Fac Sci, 3 Sci Dr 3, Singapore 117543, Singapore

[4] ASTAR, Inst Mat Res & Engn, Innovis Bldg,2 Fusionopolis Way, Singapore 138634, Singapore

[5] Nanyang Technol Univ, Facil Anal Characterizat Testing & Simulat, Earth Observ Singapore, Nanyang Ave, Singapore 639798, Singapore

[6] Kyushu Univ, Int Inst Carbon Neutral Energy Res WPI I2CN, Nishi Ku, 744 Motooka, Fukuoka 8190395, Japan

来源：

JOURNAL OF MATERIALS CHEMISTRY A | 2018年 / 6卷 / 13期

基金：

英国工程与自然科学研究理事会;

关键词：

ENERGY ION-SCATTERING; NEUTRON POWDER-DIFFRACTION; BOND-VALENCE PARAMETERS; FUEL-CELL CATHODES; OXIDES; ELECTROCATALYSIS; SPECTROSCOPY; REFINEMENT; STABILITY; DIFFUSION;

D O I：

10.1039/c7ta06817d

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A cheap and direct solution towards engineering better catalysts through identification of novel materials is required for a sustainable energy system. Perovskite oxides have emerged as potential candidates to replace the less economically attractive Pt and IrO2 water splitting catalysts. In this work, excellent electrical conductivity (980 S cm(-1)) was found for the double perovskite of composition GdBa0.6Sr0.4Co2O6-delta which is consistent with a better oxygen evolution reaction activity with the onset polarisation of 1.51 V with respect to a reversible hydrogen electrode (RHE). GdBa1-xSrxCo2O6-delta with increasing Sr content was found to crystallise in the higher symmetry tetragonal P4/mmm space group in comparison with the undoped GdBaCo2O6-delta which is orthorhombic (Pmmm), and yields higher oxygen uptake, accompanied by higher Co oxidation states. This outstanding electrochemical performance is explained by the wider carrier bandwidth, which is a function of Co-O-Co buckling angles and Co-O bond lengths. Furthermore the higher oxygen evolution activity was observed despite the formation of non-lattice oxides (mainly hydroxide species) and enrichment of alkaline earth ions on the surface.

引用

页码：5335 / 5345

页数：11

共 60 条

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