Benchmarking Perovskite Electrocatalysts’ OER Activity as Candidate Materials for Industrial Alkaline Water Electrolysis

Abstract

The selection and evaluation of electrocatalysts as candidate materials for industrial alkaline water electrolysis is fundamental in the development of promising energy storage and sustainable fuels for future energy infrastructure. However, the oxygen evolution reaction (OER) activities of various electrocatalysts already reported in previous studies are not standardized. This work reports on the use of perovskite materials (LaFeO3, LaCoO3, LaNiO3, PrCoO3, Pr0.8Sr0.2CoO3, and Pr0.8Ba0.2CoO3) as OER electrocatalysts for alkaline water electrolysis. A facile co-precipitation technique with subsequent thermal annealing (at 700 °C in air) was performed. Industrial requirements and criteria (cost and ease of scaling up) were well-considered for the selection of the materials. The highest OER activity was observed in LaNiO3 among the La-based perovskites, and in Pr0.8Sr0.2CoO3 among the Pr-based perovskites. Moreover, the formation of double perovskites (Pr0.8Sr0.2CoO3 and Pr0.8Ba0.2CoO3) improved the OER activity of PrCoO3. This work highlights that the simple characterization and electrochemical tests performed are considered the initial step in evaluating candidate catalyst materials to be used for industrial alkaline water electrolysis.

Quantitative Evaluation of the Activity of Low-Spin Tetravalent Nickel Ion Sites for the Oxygen Evolution Reaction

“…Figure and Table S8 show the Tafel slopes for each sample. The Tafel slope of LaNiO 3 was 73.3 mV dec –1 , which was consistent with previously reported values (60–70 mV dec –1 ). ,, The Tafel slope for x = 0.96 was ∼122 mV dec –1 , which also agreed with a previous study . The Tafel slope decreased from 98.2 to 66.0 mV dec –1 with a decrease in x values from 0.80 to 0.00.…”

Water electrolysis: from textbook knowledge to the latest scientific strategies and industrial developments

“…628 Nano-scaled perovskites have been accessible by fine adjustment of synthesis conditions of wet chemical routes (sol-gel processes, [629][630][631][632] hydrothermal procedures. 628 Nano-scaled perovskites have been accessible by fine adjustment of synthesis conditions of wet chemical routes (sol-gel processes, [629][630][631][632] hydrothermal procedures [633][634][635][636][637][638][639][640][641] ) deposition approaches (chemical precipitation [642][643][644][645][646][647][648][649][650][651][652] physical-, [653][654][655][656][657] or chemical vapor deposition, 658-660 electrodeposition 617,661-663 ), electrospinning, [664][665][666][667] and template-based approaches. [668][669][670][671][672][673]…”

“…628 Nano-scaled perovskites have been accessible by fine adjustment of synthesis conditions of wet chemical routes (sol–gel processes, 629–632 hydrothermal procedures. 628 Nano-scaled perovskites have been accessible by fine adjustment of synthesis conditions of wet chemical routes (sol–gel processes, 629–632 hydrothermal procedures 633–641 ) deposition approaches (chemical precipitation 642–652 physical-, 653–657 or chemical vapor deposition, 658–660 electrodeposition 617,661–663 ), electrospinning, 664–667 and template-based approaches. 668–679 Nanorods comprising SNCF are also accessible upon a facile electrospinning method (Fig.…”

A Novel Evaluation Method of Powder Electrocatalyst for Gas Evolution Reaction

“…The anode catalyst evaluated as reference catalyst was LaNiO 3 (LNO, (Synthesis method: Supplementary information S1)). 13,14 The cathode catalyst and membrane were Pt/C (TEC10E50E, Tanaka Kikinzoku Kogyo, Japan) and Zirfon μ (Perl UTP 500, Agfa, Belgium), respectively. The anode catalyst ink was prepared by mixing 20 mg catalyst and 1000 µL ethanol with a homogenizer for 3 min.…”