Bifunctional electrocatalysts of lanthanum-based perovskite oxide with Sb-doped SnO2 for oxygen reduction and evolution reactions

Fujiwara, Naoko; Nagai, Toshikazu; Ioroi, Tsutomu; Arai, Hajime; Ogumi, Zempachi

doi:10.1016/j.jpowsour.2020.227736

Cited by 28 publications

(18 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In comparison, pristine PBMNC‐0.1 NS cathode degrades within an hour whereas Pt/C‐RuO 2 couple lasts up to 15 h. Moreover, the long‐term cyclic stability test for PBMNC/LDH‐20 cathode shows only 0.46 V increase in charge‐discharge voltage gap after 100 h (Figure 4d). The cathodic performance of PBMNC/LDH‐20 is at par with the recent reports on similar composite systems (Table S5) [14,20,34,37–40] …”

Section: Resultssupporting

confidence: 75%

2D Heterojunction Between Double Perovskite Oxide Nanosheet and Layered Double Hydroxide to Promote Rechargeable Zinc‐Air Battery Performance

et al. 2020

View full text Add to dashboard Cite

The role of two‐dimensional (2D) materials in electrocatalytic energy conversion reactions is unprecedented among which the earth‐abundant metal oxide nanosheets (NSs) that could promote bifunctional electrocatalytic oxygen reduction and evolution reactions (ORR/OER) remain elusive. <20 nm thick double perovskite oxide, Pr0.5Ba0.5Mn1.8‐xNbxCo0.2O6‐δ(PBMNC‐x, x=0–0.3, δ=0.38–0.59) NSs having a lateral spread of ∼300 nm were designed with exsolved metallic Co and Co3O4 nanoparticles (NPs) anchored to the NS surface. PBMNC‐0.1 NSs demonstrate the best ORR/OER bifunctional activity among all PBMNC‐x samples with a bifunctionality index (BI) of 1.36 V, which is the combined OER and ORR overpotential (η) at 10 and−3 mA/cm2 current density, respectively. To promote the OER performance, chemically attached 2D heterojunctions of PBMNC‐0.1 NS and ymol % of NiFe (3 : 1) layered double hydroxide (NiFe‐LDH) were hydrothermally synthesized. Among the PBMNC/LDH‐y heterojunctions, PBMNC/LDH‐20 shows the lowest BI of 1.06 V because of an electronic reorganization at the heterojunction as evidenced from Mott‐Schottky analysis. Proof of concept rechargeable zinc‐air battery (r‐ZAB) with PBMNC/LDH‐20 cathode exhibits a specific capacity of 695.6 mA.h/gZn and roundtrip charge‐discharge stability for 100 h at 5 mA/cm2, surpassing the performance of state‐of‐the‐art Pt/C‐RuO2 couple.

show abstract

Section: Resultssupporting

confidence: 75%

2D Heterojunction Between Double Perovskite Oxide Nanosheet and Layered Double Hydroxide to Promote Rechargeable Zinc‐Air Battery Performance

et al. 2020

View full text Add to dashboard Cite

show abstract

“…This is consistent with previous reports that ATO is a poor electrocatalyst for the oxygen reduction reaction. 29,30 However, the performance was drastically improved with the aid of a CFL, and thus, the ATO-CFL cells achieved an OCV of 1.0 V and PPDs of 477, 320, and 244 mW cm −2 at 600, 550, and 500 °C, respectively (Figure 3e,f). This result indicates that LSC CFL can solely conduct the cathode reaction steps without the aid of electrochemically active cathodes.…”

Section: S Y N T H E S I S O F B a Z Rmentioning

confidence: 99%

Functionality of the Cathode–Electrolyte Interlayer in Protonic Solid Oxide Fuel Cells

Akimoto

Wang

Tang

et al. 2022

ACS Appl. Energy Mater.

View full text Add to dashboard Cite

Efficient power generation with protonic solid oxide fuel cells (H-SOFCs) remains challenging because the mismatch between the primary ion carriers of the electrolyte and the cathode limits the effective cathode reaction area to the gas−electrolyte− cathode triple-phase boundary (TPB), resulting in large cathodic overpotentials at low operating temperatures. Herein, we report the role of functional layers between an electrolyte and a cathode in reducing the cathodic reaction resistance at the TPB. Thin-film fuel cells with BaZr 0.1 Ce 0.7 Y 0.1 Yb 0.1 O 3−δ (BZCYYb1711) electrolytes were fabricated using a dense La 0.5 Sr 0.5 CoO 3−δ (LSC) nanofilm (approximately 100 nm) as a cathode functional layer (CFL) with the typical oxide ion/electron mixed conductor La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3−δ (LSCF), LSC, and the less-active Sb 0.1 Sn 0.9 O 2 (ATO). The peak power densities of the cells increased by >100% when using a CFL, and cells having an LSC cathode and CFL achieved power densities of 500 mW cm −2 at 500 °C. The distribution of relaxation times in the impedance spectra revealed the CFL's effect on the ohmic and polarization resistances. Crucially, cells without a CFL had large ohmic resistances because the proton-accessible electrode areas were confined to the gas−cathode−electrolyte TPB. However, the resistance decreased with the CFL because coupled partial proton conductivity and electrocatalytic activity of the LSC nanofilms increased the proton-accessible electrode area. The cells without a CFL showed a large polarization resistance because of the sluggish diffusion of O adatoms over the cathode resulting from the increased TPB length. This resistance decreased by >70% with an LSC CFL because the cells did not require long-range O diffusion because of the significantly extended proton-accessible reaction area near the gas−CFL−cathode TPB. Thus, using interfacial layers is an alternative way to design new cathode materials having low cathodic polarization for H-SOFCs.

show abstract

“…The catalyst layer formed on the GDL also prepared from the catalyst ink with similar method described in elsewhere. 35 The catalyst ink was prepared by ultrasonic mixing with the synthesized carbon/MCO hybrids or physical mixture of pCNF and MCO (1 : 1 mass ratio), water containing Triton X-100 (Kishida Chemical Co. Ltd.) and 6.0 wt% PTFE dispersion (D-210C, Daikin Industries, Ltd.). The ratio of catalyst to PTFE was controlled to be 83/17 in wt% in the resultant catalyst layer.…”

Section: Electrochemical Measurementsmentioning

confidence: 99%

Spinel-Type Metal Oxide Nanoparticles Supported on Platelet-Type Carbon Nanofibers as a Bifunctional Catalyst for Oxygen Evolution Reaction and Oxygen Reduction Reaction

et al. 2020

Self Cite

View full text Add to dashboard Cite

Development of highly active bifunctional electrocatalysts for oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) is required for air electrodes of zinc-air secondary batteries (ZAB). In this study, we synthesize spinel-type MnCo 2 O 4 (MCO) nanoparticles on highly graphitized platelet-type carbon nanofibers (pCNF) via a solvothermal method. The pCNF is selected as carbon support in this study because of the excellent stability against anodic degradation under the OER condition. The MCO nanoparticles of 2-5 nm in diameter are uniformly dispersed on pCNF and the catalyst exhibits high activities for ORR due to strong interaction pCNF and MCO, in addition to the improvement of OER activities. The MCO/carbon hybrids show comparable electrocatalytic performances to state-of-the-art bifunctional electrodes for OER and ORR.

show abstract

Bifunctional electrocatalysts of lanthanum-based perovskite oxide with Sb-doped SnO2 for oxygen reduction and evolution reactions

Cited by 28 publications

References 31 publications

2D Heterojunction Between Double Perovskite Oxide Nanosheet and Layered Double Hydroxide to Promote Rechargeable Zinc‐Air Battery Performance

2D Heterojunction Between Double Perovskite Oxide Nanosheet and Layered Double Hydroxide to Promote Rechargeable Zinc‐Air Battery Performance

Functionality of the Cathode–Electrolyte Interlayer in Protonic Solid Oxide Fuel Cells

Spinel-Type Metal Oxide Nanoparticles Supported on Platelet-Type Carbon Nanofibers as a Bifunctional Catalyst for Oxygen Evolution Reaction and Oxygen Reduction Reaction

Contact Info

Product

Resources

About