Effect of samarium (Sm3+) doping on structure and electrical conductivity of double perovskite Sr2NiMoO6 as anode material for SOFC

被引：43

作者：

Kumar, Pravin ^{[1
]}

Presto, Sabrina ^{[2
]}

Sinha, A. S. K. ^{[3
]}

Varma, Salil ^{[4
]}

Viviani, Massimo ^{[2
]}

Singh, Prabhakar ^{[1
]}

机构：

[1] Banaras Hindu Univ, Indian Inst Technol, Dept Phys, Varanasi 221005, Uttar Pradesh, India

[2] DICCA UNIGE, CNR ICMATE, Ple Kennedy 1,Pad D, I-16129 Genoa, Italy

[3] Banaras Hindu Univ, Indian Inst Technol, Dept Chem Engn & Technol, Varanasi 221005, Uttar Pradesh, India

[4] Bhabha Atom Res Ctr, Chem Div, Mod Labs, Mumbai 400085, Maharashtra, India

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2017年 / 725卷

关键词：

Double perovskite; Electrical conductivity; Combustion synthesis; SOFC; Anode material; Defects model; OXIDE FUEL-CELLS; DOPED SR2MGMOO6-DELTA; A-SITE; PERFORMANCE; FE; SUBSTITUTION; LA; NI; CO;

D O I：

10.1016/j.jallcom.2017.07.211

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：

Samarium (Sm3+) doped double perovskite Sr2-xSmxNiMoO6-delta (SSNM) with 0.01 <= x <= 0.05 is synthesized via citrate-nitrate auto-combustion route. X-ray analysis shows the presence of main phase with tetragonal symmetry and space group I4/m, along with a small amount of SrMoO4 phase. The amount of secondary phase is found to increase with increasing dopant concentration. Micro-structural study reveals the formation of uniform grains with grain growth inhibited by doping. XPS analysis clearly indicates the reduction of Mo6+ to Mo5+. Oxygen vacancies are also found to increase with dopant concentration. Monotonic trends of variation of conductivity and activation energy are observed. In particular, superior conductivity with lower most activation energy is obtained for the sample with x = 0.05. For this composition, impedance measurement is repeated under H-2 atmosphere and a significant increase of the conductivity is observed. For air-sintered material, in addition to Mo reduction a new mechanism is proposed, based on the formation of Sr and Mo vacancies which accounts for the effect of doping on lattice parameters, phase composition and conductivity. (C) 2017 Elsevier B.V. All rights reserved.

引用

页码：1123 / 1129

页数：7

共 42 条

[1] Evaluation of Sr2CoMoO6-δ as anode material in solid-oxide fuel cells: A neutron diffraction study [J].