Section 6

Perovskite-Type Material Lanthanum Cobaltite LaCoO3: Aspects of Processing Route Toward Practical Applications

*Cobalt Compounds and Applications*

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**Chapter 6**

**Abstract**

**1. Introduction**

Applications

*and Konstantin Petrov*

Perovskite-Type Lanthanum

Cobaltite LaCoO3: Aspects of

*Mirela Dragan, Stanica Enache, Mihai Varlam* 

Processing Route toward Practical

Lanthanum cobaltite (LaCoO3) perovskite-type oxide is an important conductive ceramic material finding a broad range of technical applications. Physical and chemical properties of the final lanthanum cobalt oxide powder material obtained are strongly dependent on the method of preparation. Taking in account these considerations, we focus our investigation on the solid state reaction process. The characterization of prepared lanthanum cobalt oxide material was studied by using X-ray diffractometry (XRD), scanning electron microscopy (SEM), thermogravimetry-differential scanning calorimetry (TG-DSC), and conduction properties. Following the experimental results, it can be concluded that with proper improvement, the solid state reaction process may also provide an efficient preparation method for perovskite-type LaCoO3 powder. Important to mention is that we looked into the aspects to produce again same which showed consistently reproducibility of batch to batch powder properties. This is a key factor to overcome

a successful commercialization of new material synthesis development.

**Keywords:** perovskite, LaCoO3, oxide powders synthesis, solid state reaction

The continuous interaction between structure and properties allows several intrinsic properties of perovskite materials to advance a very broad range of practical applications. These oxides are being increasingly applied to electronic and magnetic materials [1–3], automotive exhaust and water splitting catalysts [4, 5], and electrode materials for fuel cells and batteries [6, 7]. Among these perovskites, the cobalt-based type LaCoO3 perovskite ignited interest in the research since the early 1960s [8, 9] and continues to be the material of the moment. LaCoO3 perovskite has been shown to have promising catalytic activity for oxygen evolution reaction (OER) [10, 11]. Lanthanum, La, is a relatively large cation and gives structural stability to the catalyst. Rare-earth oxides with full or partially filled inner shells of lanthanide ions would involve the 4f electrons. The 4f electrons contribute to the density of states around the Fermi level, and degenerate strongly, the bandwidth is
