Oxygen evolution electrocatalytic properties of perovskite-type La1-xSrxCoO3 (0 ≤ x ≤ 0.8) oxides obtained by polyvinylpyrroli- done sol-gel route

2019 ◽  
pp. 11379-11390
Author(s):  
Narendra Kumar Singh ◽  
Keyword(s):  
Oxygen Evolution ◽  
Sol Gel ◽  
Electrocatalytic Properties ◽  
Perovskite Type

Functional Role of Fe, Cu-Doping in Ni-Based Perovskite Electrocatalysts for Oxygen Evolution Reaction

NANO ◽  
2020 ◽  
Vol 15 (06) ◽  
pp. 2050077
Author(s):  
Bingxue Hou ◽  
Cheng Cheng Wang ◽  
Rui Tang ◽  
Qi Zhang ◽  
Zanxiong Tan ◽  
...  
Keyword(s):  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Functional Role ◽  
Sol Gel ◽  
Water Electrolysis ◽  
Cu Doping ◽  
Onset Potential ◽  
Potential Alternative ◽  
Perovskite Type

Water electrolysis is of vital importance to store renewable energy and the development of efficient, inexpensive and stable electrocatalysts for oxygen evolution reaction (OER) is essential, which requires much more understanding of the structural and the element classification. Here, a series of [Formula: see text]Fex[Formula: see text][Formula: see text] perovskites have been assessed as potential noble-metal-free OER electrocatalysts prepared by sol–gel method. Moreover, the functional role of Cu and Fe amount on the B-site of perovskites for OER electrocatalytic performance was evaluated. [Formula: see text][Formula: see text][Formula: see text] materials exhibited the highest intrinsic activities in 0.1[Formula: see text]M KOH for OER with an onset potential of 1.56[Formula: see text]V, a Tafel slope of 76[Formula: see text]mV[Formula: see text][Formula: see text], slightly lower than that of benchmark perovskite-type electrocatalyst [Formula: see text][Formula: see text]C[Formula: see text][Formula: see text]O3 (BSCF). The above results demonstrate that Cu element in the B-site of perovskites had little effect on the OER performance, and [Formula: see text][Formula: see text][Formula: see text] is a potential alternative electrocatalyst for OER application.

Effect of Complexing Agent on Morphology and Crystal Structure of La1-xCexCoO3 (x=0, 0.2, and 0.4) Perovskite-Type Mixed Oxides Catalyst Prepared by Sol-Gel Method

2010 ◽  
Vol 658 ◽  
pp. 29-32 ◽  
Author(s):  
Kanit Soongprasit ◽  
Duangdao Aht-Ong ◽  
Viboon Sricharoenchaikul ◽  
Duangduen Atong
Keyword(s):  
Crystal Structure ◽  
Polyvinyl Alcohol ◽  
Mixed Oxides ◽  
Sol Gel ◽  
Value Added ◽  
Molar Ratio ◽  
Complexing Agent ◽  
Nitrate Hexahydrate ◽  
Mixed Oxide Catalysts ◽  
Perovskite Type

. La1-xCexCoO3 (x=0, 0.2, and 0.4) perovskite-type mixed oxides using polyvinyl alcohol (PVA) as complexing agent at two molar ratio of metal ion to PVA (1:1 and 1:2) were successfully prepared by sol-gel process. The precursor included lanthanum (II) nitrate hexahydrate, cerium (II) nitrate hexahydrate, and cobalt (II) nitrate hexahydrate where polyvinyl alcohol was added as complexing agent. The suitable condition of Cerium (Ce) substitution and PVA molar ratio were established for further application in hydrocarbon conversion to high value added products. TGA thermogram of as-prepared precursor showed that PVA absolutely decomposed at temperature higher than 500°C. XRD patterns of calcined catalyst showed both LaCoO3 rhombohedral and CeO2 cubic structures that confirmed the formation of mixed crystal structure. Nevertheless, Co3O4 slightly appeared with low peak intensity which came from the oxidation reaction of as-prepared catalyst during calcinations. XRD showed that PVA did not effect to crystal structure of synthesized catalyst. Higher PVA content added in the precursor cause the reduction of crystal growth of catalyst in calcinations step. In contrast, morphology of catalyst is directly related with PVA content such that the spongy and sheet-like structure were formed with increasing PVA content which prevented the agglomeration of particles. The results showed that PVA content play an important role in morphology of perovskite-type mixed oxide catalysts but did not affected to their crystal structures.

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