Assemblage of Perovskite LaNiO₃ Connected With In Situ Grown Nitrogen‐Doped Carbon Nanotubes as High‐Performance Electrocatalyst for Oxygen Evolution Reaction

Abstract

In this study, the synthesis of nano‐sized phase‐pure perovskite LaNiO3 with in‐situ grown nitrogen doped carbon nanotubes (NCNTs) is reported. The heterogenous material acts as highly active and durable electrocatalyst toward oxygen evolution reaction (OER) in alkaline solution. The LaNiO3 nanoparticles prepared by the conventional method require an overpotential of 490 mV, while the one synthesized by the proposed polyol method in this work requires only 410 mV, and the value can be further decreased to merely 390 mV for the as‐prepared LaNiO3‐NCNTs at a current density of 10 mA cm−2. The high performance of this composite material could be due to the exposure of more active sites existing on the surface of LaNiO3 nanoparticles and the connected NCNTs, which improve the charge transfer from the active LaNiO3 surface to the electrode substrate and therefore outperforms the electrocatalytic activity in comparison to commercial RuO2 catalyst. The synthesis method reported here opens a new way to design advanced perovskite oxides for OER even other applications.

Sm0.5Sr0.5Co1−xNixO3−δ—A Novel Bifunctional Electrocatalyst for Oxygen Reduction/Evolution Reactions

“…The Ni 2p spectra of SSCN82 show two peaks at 853.8 and 859.3 eV corresponding to Ni 2p 3/2 and a satellite peak at higher binding energies [29,30]. From Figure 4d, the O 1s peaks for the sample are located at 529, 531.7, and 533.1 eV, respectively, corresponding to lattice oxygen, absorbed oxygen, and absorbed water [31,32]. The binding energies of Ni 2p and Co 2p in SSCN82 reveal that the Ni and Co atoms are uniformly distributed in the crystal structure.…”

Vertical Growth of Porous Perovskite Nanoarrays on Nickel Foam for Efficient Oxygen Evolution Reaction

“…(b) Comparison of OER activities of perovskite oxides in alkaline conditions at the overpotential of 420 mV vs RHE. Reference cited in panel (b): LaCoO 3 , LaNiO 3 , LaFeO 3 , LaMnO 3 , LaCrO 3 , LaFeO 3 , La 1– x FeO 3−δ , SrCoO 3 , SrCoO 2.85 F 0.15 , LaNiO 3 -NCNTs, BaCo 0.7 Fe 0.2 Sn 0.1 O 3−δ , BaCo 0.8 Zr 0.1 Y 0.1 O 3−δ , SrCo 0.4 Fe 0.2 W 0.4 O 3−δ , and La 0.7 Sr 0.3 CoO 3−δ . (c) Corresponding Tafel slopes.…”

“…The O ab / O L ratio of LaCoO 3 /NF (1.36) is higher than that of the bulk LaCoO 3 (1. 19), suggesting that LaCoO 3 /NF obtained via the hydrothermal method contains more oxygen vacancies. 29 The asymmetrical Co 2p spectra were decoupled into four components (Figure S5c).…”

“…32 and four times more active than fluorinedoped SrCoO 3 at the same overpotential. 14 The OER performance of LaCoO 3 /NF also exceeds the activity of LaNiO 3 particles which are assembled with nitrogen-doped carbon nanotubes (NCNTs), 19 as well as those of BaCo 0 . 22 The excellent catalytic performance of the LaCoO 3 /NF electrode makes it comparable to transitionmetal-based electrocatalysts (Table S3).…”

“…16,17 Although advances have been achieved, it remains a challenge to design perovskites with controlled morphology as stable and efficient OER catalysts. Since most perovskite oxides have poor electrical conductivity, conductive agents such as carbon black, 14 graphene, 18 and carbon nanotubes 19 are required to enable efficient electron transportation. Furthermore, the usage of chemical binders for powdery perovskite catalysts inevitably leads to a decrease in electrical conductivity and limits active sites, resulting in reduced electrocatalytic performance and stability.…”