Electrochemical Charge–Discharge Behavior of a Binder-Free 3D-Printed LCNO-Derived Multiphase La–Cu–Ni–O Ceramic Electrode
Journal of the Chinese Chemical Society, 2026 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Basım Tarihi: 2026
- Doi Numarası: 10.1002/jccs.70269
- Dergi Adı: Journal of the Chinese Chemical Society
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Chemical Abstracts Core, INSPEC, Academic Search Ultimate (EBSCO), Materials Science & Engineering Collection (ProQuest), Technology Collection (ProQuest)
- Anahtar Kelimeler: 3D-printed porous electrode, alkaline electrolyte, faradaic charge storage, La–Cu–Ni–O mixed oxides, multiphase oxide electrode
- Çukurova Üniversitesi Adresli: Evet
Özet
In this study, the electrochemical charge–discharge behavior of a binder-free, self-supporting, porous three-dimensional (3D) LCNO-derived multiphase La–Cu–Ni–O ceramic electrode (LCNO-MP) fabricated from a nominal La2CuNiO6 precursor powder (LCNO) was investigated. The sintered electrode derived from this LCNO precursor powder is referred to as the LCNO-derived multiphase La–Cu–Ni–O ceramic electrode, abbreviated as LCNO-MP electrode. Structural and morphological analyses (XRD, FE-SEM, FT-IR, and BET) confirmed that sintering produced an interconnected porous electrode architecture while preserving a dominant LCNO-related La–Cu–Ni–O mixed oxide phase accompanied by secondary lanthanum nickel oxide, lanthanum copper oxide, and metallic Ni phases. The electrochemical response of the LCNO-MP electrode was evaluated in 1.0 M KOH electrolyte using electrochemical impedance spectroscopy (EIS), cathodic polarization, cyclic voltammetry (CV), and galvanostatic charge–discharge (GCD) analyses. EIS results indicated measurable but kinetically limited interfacial charge-transfer behavior within the standalone porous ceramic electrode. CV analyses revealed faradaic redox features; however, the unusually low b value of 0.243 indicates a highly non-ideal electrochemical response influenced by polarization, resistive limitations, possible side reactions, and peak-selection uncertainty rather than a clear diffusion-controlled hydrogen insertion/extraction mechanism. GCD measurements showed measurable Faradaic charge/discharge behavior; however, the large difference between charge and discharge capacities and the recoverable discharge capacity below 0.20 mAh g−1 indicate poor reversibility, likely due to parasitic hydrogen evolution, irreversible redox processes, polarization losses, and/or other side reactions. Overall, the 22-cycle GCD test revealed a time-dependent, non-stabilized, and poorly reversible electrochemical response.