Perovskite-type La2-xSrxNiO4 (0 ≤ x ≤ 1) as active anode materials for methanol oxidation in alkaline solutions

被引：62

作者：

Singh, R. N. ^{[1
]}

Sharma, T. ^{[1
]}

Singh, A. ^{[1
]}

Anindita ^{[1
]}

Mishra, D. ^{[1
]}

Tiwari, S. K. ^{[2
]}

机构：

[1] Banaras Hindu Univ, Fac Sci, Dept Chem, Varanasi 221005, Uttar Pradesh, India

[2] Natl Met Lab, Appl Chem & Corros Div, Jamshedpur 831007, Bihar, India

来源：

ELECTROCHIMICA ACTA | 2008年 / 53卷 / 05期

关键词：

nano-sized; perovskite-type; methanol oxidation; electro-oxidation; oxide anodes;

D O I：

10.1016/j.electacta.2007.09.047

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Perovskite-type ternary oxides with molecular formulae, La2-xSrxNiO4 (0 <= x <= 1), were prepared by a modified citric acid sol-gel route at 600 degrees C for their possible use in a direct methanol fuel cell (DMFC). The study was conducted by cyclic voltammetry, chronoamperometry, impedance and anodic Tafel polarization techniques. The results showed that the electrocatalytic activity of the base oxide (x=0) in 1 M KOH plus 1 M CH3OH at 25 degrees C increases with x, the observed current densities being 23.6, 47.3, 43.2 and 50.9mAcm(-2) at a scan rate of 10 mVs(-1) and E=0.6V versus Hg/HgO for oxides with x=0, 0.25, 0.5 and 1.0, respectively. A I I the four perovskite anodes used in this study did not indicate any poisoning by the methanol oxidation intermediates/products. The methanol electro-oxidation reaction followed a Tafel slope of similar to 2 x 2.303RT/3F (=40 mV decade(-1)) on each oxide catalyst, regardless of Sr content. (c) 2007 Elsevier Ltd. All rights reserved.

引用

页码：2322 / 2330

页数：9

共 40 条

[1] ELECTROOXIDATION OF METHANOL ON GRAPHITE-SUPPORTED PEROVSKITE-MODIFIED PT ELECTRODES IN ALKALINE-SOLUTION [J].