Multiple perovskite layered lanthanum nickelate Ruddlesden-Popper systems as highly active bifunctional oxygen catalysts

Deep Eutectic Solvent Synthesis of Perovskite Electrocatalysts for Water Oxidation

“…Comparison between the Tafel slopes as well as overpotentials required for driving current density of 10 mA cm –2 for our best-performing electrocatalyst, LaCoO 3 , and reported state-of-the-art perovskite electrocatalysts for alkaline water oxidation. ,,− …”

“…8 In another study, the fourlayered perovskite La 5 Ni 3 CoO 13−δ , synthesized through glycine nitrate combustion, was found to be enriched with oxygen defects and showed exceptional electrocatalytic OER activity (b = 35 mV dec −1 ). 49 Ce-doping of LaCoO 3 was found to significantly increase the concentration of V O as compared to pristine LaCoO 3 , with La 0.96 Ce 0.04 CoO 3−δ synthesized using a microwave/ultrasound-assisted hydrothermal route (b = 80 mV dec −1 ), outperforming pure LaCoO 3 (b = 124 mV dec −1 ) in alkaline OER. 9 The herein reported DES synthesis route provides a straightforward approach to introduce V O in LaCoO 3 , placing the material with η 10 = 390 mV and b = 55.8 mV dec −1 among the best of the state-of-the-art perovskite electrocatalysts for alkaline water oxidation (Figure 6).…”

“…For example, plasma treatment was used to introduce V O in PrBa 0.5 Sr 0.5 Co 1.5 Fe 0.5 O 5+δ , resulting in highly active catalyst material with b = 94 mV dec –1 . In another study, the four-layered perovskite La 5 Ni 3 CoO 13−δ , synthesized through glycine nitrate combustion, was found to be enriched with oxygen defects and showed exceptional electrocatalytic OER activity ( b = 35 mV dec –1 ) . Ce-doping of LaCoO 3 was found to significantly increase the concentration of V O as compared to pristine LaCoO 3 , with La 0.96 Ce 0.04 CoO 3−δ synthesized using a microwave/ultrasound-assisted hydrothermal route ( b = 80 mV dec –1 ), outperforming pure LaCoO 3 ( b = 124 mV dec –1 ) in alkaline OER .…”

Hierarchically porous Ni foam-supported Co and Sn doped Ni3S2 nanosheets for oxygen evolution reaction electrocatalysts

“…An atomic surface modification with specific elements is an effective method to further boost the OER property by manipulating the electronic structure and charge transport kinetics of electrocatalysts. 21,22 Song et al 23 reported Co-doped Ni 3 S 2 hierarchical nanoarrays on NF substrate (Co-Ni 3 S 2 @NF) derived from zeolitic imidazolate frameworks with a trunk-branch three-dimensional composite structure. The Co-Ni 3 S 2 @NF showed a low overpotential of 120 mV at 10 mA cm −2 (1 M KOH) for the OER and long-term electrochemical durability in alkaline conditions.…”

Iron carbide nanoparticles supported on an N-doped carbon porous framework as a bifunctional material for electrocatalytic oxygen reduction and supercapacitors

“…Therefore Fe 3 C/PNCF can be considered as a promising candidate for ORR electrocatalysts. 5,48 Moreover, Tafel plots are calculated from LSV results to further describe the kinetics of our synthesized ORR catalysts and commercial Pt/C (Fig. 5d).…”