Interfacial Engineering for Enhanced Protonic Conduction in NaxCoO2−δ–Sm0.2Ce0.8O2−δ Semiconductor Ionic Heterostructures for Low-Temperature Solid Oxide Fuel Cells DOI

Kalaimathi Sivanandam,

K. Suresh Babu

ACS Applied Energy Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 21, 2024

Interfacial engineering is pivotal in optimizing the ionic conductivity semiconductor–ionic electrolytes for low-temperature solid oxide fuel cells (LT-SOFCs). In this study, we propose a semiconductor NaxCoO2−δ and Sm0.2Ce0.8O2−δ (SDC) heterostructure as functional membrane sandwiched between two symmetric porous electrodes LiNi0.8Co0.15Al0.05O2−δ (NCAL). The A-site non-stoichiometry modifies energy band structure by altering Co3+/Co4+ concentration, thereby regulating conduction properties. Structural electrical characterization of material was conducted to investigate heterointerfaces, oxygen vacancies, their influence on charge carrier transportation. Electrochemical impedance spectroscopy demonstrated remarkable performance Na0.7CoO2–SDC (NCO7–SDC), which exhibited an 0.132 S/cm at 550 °C under 3% H2O humidified (4% H2 + 96% N2) conditions. Enhanced interfacial transportation attributed synergistic interplay Li+-rich space-charge layers, alignment, excess vacancies generated interface along with Schottky junction metallic Ni-electrode electrolyte. Our investigation further reveals that optimal concentration Na ions crucial inducing appropriate bending vacancy generation Na0.7CoO2–SDC, enhance protonic conduction. XPS analysis hydrogen-exposed sample confirmed dominant through H+ OH– species. These findings emphasize potential NaxCoO2–SDC high-performance electrolyte LT-SOFC, even low-concentration fuel, paving way advancement cell technology.

Language: Английский

Realizing Coinstantaneous Multiple Benefits Generation from Sm0.075Nd0.075Ce0.85O2−δ/Al2O3 Heterostructure Electrolyte by Interfacial Engineering DOI
Jiamei Liu,

Decai Zhu,

Chengjun Zhu

et al.

The Journal of Physical Chemistry C, Journal Year: 2024, Volume and Issue: 128(22), P. 9041 - 9050

Published: May 24, 2024

The electrolyte in a solid oxide fuel cell (SOFC) should have high ionic conductivity to guarantee performance. This requires tuning of the structure, which is often limited by poor performance when operating temperature. Here, we report ceria–semiconductor (Sm0.075Nd0.075Ce0.85O2−δ, SNDC)/insulator (i-Al2O3) heterostructure composite enhances and improves interfacial engineering. A maximum power density 1312.5 mW·cm–2 an 0.18 S·cm–1 at 550 °C were achieved. small amount ultrawide band gap i-Al2O3 (molar ratio 92SNDC-8Al2O3) effectively improved transport creating potential energy barrier heterointerface. In addition, n–i suppresses electron conduction conduction, contributing outstanding electrochemical observed. results demonstrate that engineering could be simple effective method facilitate fast ions low-temperature SOFCs.

Language: Английский

Citations

2
Interfacial Engineering for Enhanced Protonic Conduction in NaxCoO2−δ–Sm0.2Ce0.8O2−δ Semiconductor Ionic Heterostructures for Low-Temperature Solid Oxide Fuel Cells DOI

Kalaimathi Sivanandam,

K. Suresh Babu

ACS Applied Energy Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 21, 2024

Interfacial engineering is pivotal in optimizing the ionic conductivity semiconductor–ionic electrolytes for low-temperature solid oxide fuel cells (LT-SOFCs). In this study, we propose a semiconductor NaxCoO2−δ and Sm0.2Ce0.8O2−δ (SDC) heterostructure as functional membrane sandwiched between two symmetric porous electrodes LiNi0.8Co0.15Al0.05O2−δ (NCAL). The A-site non-stoichiometry modifies energy band structure by altering Co3+/Co4+ concentration, thereby regulating conduction properties. Structural electrical characterization of material was conducted to investigate heterointerfaces, oxygen vacancies, their influence on charge carrier transportation. Electrochemical impedance spectroscopy demonstrated remarkable performance Na0.7CoO2–SDC (NCO7–SDC), which exhibited an 0.132 S/cm at 550 °C under 3% H2O humidified (4% H2 + 96% N2) conditions. Enhanced interfacial transportation attributed synergistic interplay Li+-rich space-charge layers, alignment, excess vacancies generated interface along with Schottky junction metallic Ni-electrode electrolyte. Our investigation further reveals that optimal concentration Na ions crucial inducing appropriate bending vacancy generation Na0.7CoO2–SDC, enhance protonic conduction. XPS analysis hydrogen-exposed sample confirmed dominant through H+ OH– species. These findings emphasize potential NaxCoO2–SDC high-performance electrolyte LT-SOFC, even low-concentration fuel, paving way advancement cell technology.

Language: Английский

Citations

0