Solid State IonicsPub Date : 2025-12-01Epub Date: 2025-10-21DOI: 10.1016/j.ssi.2025.117046
Mikhail N. Palatnikov, Vladimir A. Sandler, Nikolay V. Sidorov, Olga V. Palatnikova
{"title":"Hydrogen conductivity and anisotropy of ionic conductivity of LiB3O5 crystals","authors":"Mikhail N. Palatnikov, Vladimir A. Sandler, Nikolay V. Sidorov, Olga V. Palatnikova","doi":"10.1016/j.ssi.2025.117046","DOIUrl":"10.1016/j.ssi.2025.117046","url":null,"abstract":"<div><div>The defect structure of LBO crystals of different orientations has been studied. Various types of macro-, meso- and micro-defects have been discovered in the crystal structure. Optical microscopy studies revealed the greatest defects in z-oriented LBO crystalline samples. Dendrite fractal structures have spontaneously formed on the surface of LBO samples. Features of the structures indicate internal stresses in the crystalline plates upper layers, and crystal defects. The anisotropy of ionic conductivity of LiB<sub>3</sub>O<sub>5</sub> (LBO) crystals containing H<sup>+</sup> cations as a technological impurity has been studied. A pronounced effect of high-temperature annealing of LBO crystals on the dielectric properties and conductivity features has been found. The obtained results explain some contradictions in the literature data on the phase states, conductivity character and pyroelectric properties of LBO crystals. The contributions of intrinsic (Li<sup>+</sup>) and impurity (H<sup>+</sup>) conductivity have been separated in LBO samples of x, z orientation with small values of intrinsic conductivity, and their temperature dependences have been obtained. The transition temperatures from impurity to intrinsic conductivity with the corresponding increase in the activation enthalpy for x, y, z cuts of LBO crystals have been established. It has been shown that in LBO crystal technology it is desirable to reduce the concentration of doping H<sup>+</sup> cations.</div></div>","PeriodicalId":431,"journal":{"name":"Solid State Ionics","volume":"432 ","pages":"Article 117046"},"PeriodicalIF":3.3,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145360227","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Solid State IonicsPub Date : 2025-12-01Epub Date: 2025-10-11DOI: 10.1016/j.ssi.2025.117041
Sophie G. Martin , Oscar J.B. Ballantyne , Clemens Ritter , Ying Zhou , Frazer N. Forrester , James A. Dawson , Abbie C. Mclaughlin
{"title":"Enhancement of oxide ion and proton conductivity in Sr3-xCaxV2O8 palmierites through tuning of the crystal structure","authors":"Sophie G. Martin , Oscar J.B. Ballantyne , Clemens Ritter , Ying Zhou , Frazer N. Forrester , James A. Dawson , Abbie C. Mclaughlin","doi":"10.1016/j.ssi.2025.117041","DOIUrl":"10.1016/j.ssi.2025.117041","url":null,"abstract":"<div><div>Sizeable oxide ion and proton conductivity have recently been reported in <em>A</em><sub>3</sub>V<sub>2</sub>O<sub>8</sub> (<em>A</em> = Ba, Sr) palmierites. The solid solution Sr<sub>3-<em>x</em></sub>Ca<sub><em>x</em></sub>V<sub>2</sub>O<sub>8</sub> (<em>x</em> = 0.0–0.2) has been synthesised and investigated by electrochemical characterisation and atomistic modelling, revealing key insights into the design principles for enhancing oxide and proton conduction in palmierites. Neutron diffraction data shows that at 20 °C there is a reduction in crystal symmetry from <span><math><mi>R</mi><mover><mn>3</mn><mo>¯</mo></mover><mi>m</mi></math></span> to <span><math><mi>C</mi><mn>2</mn><mo>/</mo><mi>c</mi></math></span> for <em>x</em> ≥ 0.05. Upon heating to 600 °C, <span><math><mi>R</mi><mover><mn>3</mn><mo>¯</mo></mover><mi>m</mi></math></span> symmetry is restored for all phases. An increase in both the oxide ion and proton conductivity are observed with Ca<sup>2+</sup> doping. The oxide ion conductivity scales with the magnitude of displacement of the V<sup>5+</sup> cation and V<img>O2 bond length.</div></div>","PeriodicalId":431,"journal":{"name":"Solid State Ionics","volume":"432 ","pages":"Article 117041"},"PeriodicalIF":3.3,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145265179","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Solid State IonicsPub Date : 2025-12-01Epub Date: 2025-10-10DOI: 10.1016/j.ssi.2025.117044
Haoshen Wang , Qing Shao , Yue Lu , Dun Jin , Fupeng Cheng , Chengzhi Guan , Zhi Li , Guoping Xiao , Juncai Sun , Jian-Qiang Wang
{"title":"Investigation on electrochemical behavior and degradation mechanism of a reversible solid oxide cell operating at high current densities","authors":"Haoshen Wang , Qing Shao , Yue Lu , Dun Jin , Fupeng Cheng , Chengzhi Guan , Zhi Li , Guoping Xiao , Juncai Sun , Jian-Qiang Wang","doi":"10.1016/j.ssi.2025.117044","DOIUrl":"10.1016/j.ssi.2025.117044","url":null,"abstract":"<div><div>Reversible solid oxide cell have significant potential for storing energy from intermittent renewable sources. However, the current densities must be increased to improve the energy conversion efficiency and reduce system costs. In this study, a fuel electrode-supported cell with an effective area of 16 cm<sup>2</sup> was operated for 288 h, switching between solid oxide fuel cell and solid oxide electrolysis cell modes at the current densities of ±1.88 A cm<sup>−2</sup>. The electrochemical impedance spectroscopy collected at the open-circuit voltage were analyzed using the distribution of relaxation times and equivalent circuit modeling methods to evaluate the contribution of each electrode process to degradation. The results demonstrated that charge transfer reactions in the fuel and oxygen electrodes were the primary cause of cell performance degradation. According to the post-test analysis, the primary degradation mechanisms are the migration of nickel from the active layer to support layer and the coarsening of nickel in the fuel electrode. Other degradation mechanisms included the segregation of strontium and valence fluctuations of cobalt, which acted synergistically to the oxygen electrode. At elevated current densities, the concurrent migration of nickel in the same direction reduced to a reduction in the triple-phase boundary, which could not be adequately compensated for. This phenomenon significantly impaired the cell performance.</div></div>","PeriodicalId":431,"journal":{"name":"Solid State Ionics","volume":"432 ","pages":"Article 117044"},"PeriodicalIF":3.3,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145265176","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Solid State IonicsPub Date : 2025-12-01Epub Date: 2025-10-13DOI: 10.1016/j.ssi.2025.117040
Yang Zhang , Donghao Zhang , Jian Zhang, Xin Li, Xiaoling Hu, Ping Guan, Xin Wang
{"title":"Poly(ionic liquid)/expanded pore NH2-UiO-66 composite solid-state electrolyte for high-performance solid-state lithium-ion batteries","authors":"Yang Zhang , Donghao Zhang , Jian Zhang, Xin Li, Xiaoling Hu, Ping Guan, Xin Wang","doi":"10.1016/j.ssi.2025.117040","DOIUrl":"10.1016/j.ssi.2025.117040","url":null,"abstract":"<div><div>The development of high-performance solid electrolytes is essential for advancing ion batteries. This research introduces a novel approach for the simultaneous construction of poly(ionic liquid) and ionic conductors, creating a synergistic system that integrates a new polycationic ionic liquid matrix with ionic liquid-modified ionic conductors (Li-IL@PA-UiO-66-NH<sub>2</sub>). This method markedly improves the interfacial compatibility between the polymer substrate and the functional filler. The filler enhances the composite electrolyte, achieving a higher transference number and ionic conductivity documented in recent studies, alongside improved voltage stability. We engineer and manufacture poly(1-vinyl-3-dodecylimidazole) bis(trifluoromethanesulfonimide) ([P(VIM-R)]TFSI) ionic liquids, which are subsequently utilized as the primary polymer, resulting in the formation of a poly(ionic liquid) solid-state electrolyte (P-GPE). Subsequently, we integrate it with the Li-IL@PA-UiO-66-NH<sub>2</sub> ionic conductor to formulate a poly(ionic liquid) composite solid-state electrolyte (P-CPE). The findings indicate that the ionic conductivity of P-CPE at 30 °C is 2.35 × 10<sup>−4</sup> S cm<sup>−1</sup>, with a transference number of 0.77. This value is 1.85 and 1.33 times higher than that of P-GPE, and the material can function safely up to 5 V. This study emphasizes the role of solid-state electrolytes in advancing the development of next-generation solid-state batteries.</div></div>","PeriodicalId":431,"journal":{"name":"Solid State Ionics","volume":"432 ","pages":"Article 117040"},"PeriodicalIF":3.3,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145322553","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Solid State IonicsPub Date : 2025-12-01Epub Date: 2025-10-18DOI: 10.1016/j.ssi.2025.117056
Hyein Song , Young-Woong Song , Hyochan Lee , Jinsub Lim , Jieun Ryu , Yoojeong Noh , Sung-Won Kang , Seung Heon Lee , Jin Geon Yang , Jaekook Kim , Min-Young Kim
{"title":"Effect of LiNbO3 surface dry-coating on the air stability of Ga-doped LLZO solid electrolytes","authors":"Hyein Song , Young-Woong Song , Hyochan Lee , Jinsub Lim , Jieun Ryu , Yoojeong Noh , Sung-Won Kang , Seung Heon Lee , Jin Geon Yang , Jaekook Kim , Min-Young Kim","doi":"10.1016/j.ssi.2025.117056","DOIUrl":"10.1016/j.ssi.2025.117056","url":null,"abstract":"<div><div>Oxide-based garnet-type Li<sub>7</sub>La<sub>3</sub>Zr<sub>2</sub>O<sub>12</sub> (LLZO) solid electrolytes (SEs) have attracted significant attention as promising candidates for next-generation all-solid-state batteries (ASSBs) with high ionic conductivity of 1 × 10<sup>−3</sup>–10<sup>−4</sup> S cm<sup>−1</sup>. However, LLZO is prone to surface degradation upon exposure to H<sub>2</sub>O and CO<sub>2</sub> in the air, leading to the formation of Li<sub>2</sub>CO<sub>3</sub> impurities. This not only reduces the ionic conductivity but also increases interfacial resistance with the electrode, ultimately impairing the electrochemical and mechanical performance of the cell. In this study, we investigated and compared the air stability of LiNbO<sub>3</sub>-coated Ga-LLZO and the pristine Ga-LLZO. According to the Accelerated Durability Test (ADT), the formation of Li<sub>2</sub>CO<sub>3</sub> on the surface of LiNbO<sub>3</sub>-coated Ga-LLZO pellets was suppressed compared to the pristine Ga-LLZO. The total ionic conductivity of the pristine Ga-LLZO was 3.90 × 10<sup>−4</sup> S cm<sup>−1</sup>, while the LiNbO<sub>3</sub>-coated Ga-LLZO was 9.17 × 10<sup>−4</sup> S cm<sup>−1</sup>. Therefore, the ionic conductivity maintenance rates after ADT were 79 % for the LiNbO<sub>3</sub>-coated Ga-LLZO, compared to only 23 % for the pristine Ga-LLZO. These results demonstrate that surface coating of Ga-LLZO particles with LiNbO<sub>3</sub> effectively suppresses air degradation reactions and significantly contributes to long-term ionic conductivity maintenance and improved air stability.</div></div>","PeriodicalId":431,"journal":{"name":"Solid State Ionics","volume":"432 ","pages":"Article 117056"},"PeriodicalIF":3.3,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145322995","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Solid State IonicsPub Date : 2025-12-01Epub Date: 2025-10-14DOI: 10.1016/j.ssi.2025.117045
Vishalkumar Oli , M. Initha , Vaishali Madhani , Kalappa Prashantha , Neeladri Das , Sujeet Kumar Chaurasia , Kuldeep Mishra , Rahul Gera , Jehova Jire L. Hmar , Deepak Kumar
{"title":"Influence of succinonitrile on structural, thermal, electrochemical and optical properties of sodium-ion conducting PVdF-HFP based gel polymer electrolyte membranes","authors":"Vishalkumar Oli , M. Initha , Vaishali Madhani , Kalappa Prashantha , Neeladri Das , Sujeet Kumar Chaurasia , Kuldeep Mishra , Rahul Gera , Jehova Jire L. Hmar , Deepak Kumar","doi":"10.1016/j.ssi.2025.117045","DOIUrl":"10.1016/j.ssi.2025.117045","url":null,"abstract":"<div><div>A novel sodium (Na)-ion conducting gel polymer electrolyte <em>co</em>mposed of poly(vinylidine-fluoride-co-hexafluoropropylene) (PVdF-HFP) complexed with sodium tetrafluoro-borate (NaBF<sub>4</sub>) and ethylene carbonate (EC)-propylene carbonate (PC) as a co-solvent, coupled via differing fractions of a non-ionic plastic crystal succinonitrile (SN) are developed and studied. X-ray diffraction and Fourier transform infra-red studies identifies significant structural alterations in terms of reduced crystallinity and the interactions among the polymeric components on incorporation of SN. The thermogravimetric and differential scanning calorimetry investigations indicate that the synthesized electrolytes experience a weight reduction of less than 5 % up to 100 °C and maintain the gel stage up to 125 °C, respectively. The elevated polarity and rotational disorder of the SN molecules in the plastic-crystalline phase facilitate the improvement of ionic conductivity in the P<em>V</em>dF-HFP/EC-PC/NaBF<sub>4</sub> complex system, achieving an optimal RT ionic conductivity of about 4.55 × 10<sup>−3</sup> S cm<sup>−1</sup> with the incorporation of 50 wt% of SN with purely ionic character. The working voltage range for the optimized electrolyte specimen was 4.9 V. The UV–Vis studies demonstrate the enhancement in absorbance and the reduction of the optical band gap by adding SN up to 50 wt%. The experimental results of the contact angle indicated an improvement in hydrophobicity with higher concentrations of SN across the PVdF-HFP matrix. The operational attributes for the SN-incorporated polymeric system suggest their possible use as electrolytes in electrochemical energy storage applications.</div></div>","PeriodicalId":431,"journal":{"name":"Solid State Ionics","volume":"432 ","pages":"Article 117045"},"PeriodicalIF":3.3,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145323000","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Solid State IonicsPub Date : 2025-12-01Epub Date: 2025-11-15DOI: 10.1016/j.ssi.2025.117072
A. Guseva, N. Pestereva, V. Gardt, D. Kuznetsov
{"title":"Novel oxygen-ion conductors Ln10W22O81 (Ln = La, Ce, Pr, Nd)","authors":"A. Guseva, N. Pestereva, V. Gardt, D. Kuznetsov","doi":"10.1016/j.ssi.2025.117072","DOIUrl":"10.1016/j.ssi.2025.117072","url":null,"abstract":"<div><div>Lanthanide tungstates Ln<sub>10</sub>W<sub>22</sub>O<sub>81</sub> (Ln = La, Ce, Pr, Nd) were prepared by the by solid-state reaction technique and their electrical conductivity have been examined by the electrochemical impedance method. Predominant ionic conductivity in Ln<sub>10</sub>W<sub>22</sub>O<sub>81</sub> (Ln = La, Pr, Nd) was established both by the EMF method and from independence of conductivity versus oxygen partial pressure. Ce<sub>10</sub>W<sub>22</sub>O<sub>81</sub> reveals some contribution of the electronic p-type component. The Tubandt method established that the ionic charge carriers in lanthanide tungstates are oxygen ions. It was found that the electrical conductivity of the studied lanthanide tungstates decreases in the order Ce<sub>10</sub>W<sub>22</sub>O<sub>81,</sub> Pr<sub>10</sub>W<sub>22</sub>O<sub>81</sub>, La<sub>10</sub>W<sub>22</sub>O<sub>81</sub>, Nd<sub>10</sub>W<sub>22</sub>O<sub>81</sub>. Of all the compounds studied, praseodymium tungstate has the highest oxygen-ion conductivity (3.2 × 10<sup>−4</sup> S/cm at 800 °C), which makes it the most promising for further research and application in solid-state ionics.</div></div>","PeriodicalId":431,"journal":{"name":"Solid State Ionics","volume":"433 ","pages":"Article 117072"},"PeriodicalIF":3.3,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145527943","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Preparation of partially Y- or Yb-substituted SrFeO3-δ with cubic perovskite structure and its electrical conduction properties","authors":"Keina Nagai , Chihiro Kato , Ryutaro Maehara , Taizo Yoshino , Takayuki Sugimoto , Kosuke Shido , Takuya Hashimoto , Fumito Fujishiro , Eiki Niwa , Motoyuki Matsuo","doi":"10.1016/j.ssi.2025.117073","DOIUrl":"10.1016/j.ssi.2025.117073","url":null,"abstract":"<div><div>SrFeO<sub>3-<em>δ</em></sub> prepared in air exhibits a tetragonal or orthorhombic perovskite crystal structure with an ordered distribution of oxide-ion vacancies at room temperature. Changing the crystal structure to cubic perovskite with a random distribution of oxide-ion vacancies is expected to improve the hole or oxide-ion conductivity. In this study, the crystal structure of SrFeO<sub>3-<em>δ</em></sub> was altered by partially substituting Y or Yb at the Sr or Fe sites. X-ray diffraction and X-ray absorption spectroscopy revealed that Y partially substituted only at the Sr site, whereas Yb could substitute at both the Sr and Fe sites. Both substitutions resulted in a cubic perovskite structure. Mössbauer spectroscopy detected charge delocalization from the Y- or Yb-substitution in the cubic phase. The degree of delocalization was higher in the Sr-site-substituted specimen than in the Fe-site-substituted specimen. The cubic phases of Sr<sub>1-<em>x</em></sub>Y<sub><em>x</em></sub>FeO<sub>3-<em>δ</em></sub>, Sr<sub>1-<em>x</em></sub>Yb<sub><em>x</em></sub>FeO<sub>3-<em>δ</em></sub>, and SrFe<sub>1-<em>x</em></sub>Yb<sub><em>x</em></sub>O<sub>3-<em>δ</em></sub> exhibited a semiconducting temperature dependence devoid of phase transition effects. The lower electrical conductivity of SrFe<sub>1-<em>x</em></sub>Yb<sub><em>x</em></sub>O<sub>3-<em>δ</em></sub> compared with that of Sr<sub>1-<em>x</em></sub>Yb<sub><em>x</em></sub>FeO<sub>3-<em>δ</em></sub> corresponded to the lower delocalization degree observed by Mössbauer spectroscopy. Sr<sub>0.9</sub>Y<sub>0.1</sub>FeO<sub>3-<em>δ</em></sub> and Sr<sub>0.9</sub>Yb<sub>0.1</sub>FeO<sub>3-<em>δ</em></sub> exhibited electrical conductivity comparable with that of cubic SrFeO<sub>2.75</sub> above 420 °C without the structural phase transition influence, indicating their application potential, e.g., for gas separation and electrodes in solid oxide fuel cells.</div></div>","PeriodicalId":431,"journal":{"name":"Solid State Ionics","volume":"433 ","pages":"Article 117073"},"PeriodicalIF":3.3,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145578203","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Highly conductive Na5YSi4O12 ceramic solid electrolyte by controlling Na deficiency in the precursors","authors":"Yoshiki Yasuda, Genta Tateno, Tomohiro Tojo, Ryoji Inada","doi":"10.1016/j.ssi.2025.117049","DOIUrl":"10.1016/j.ssi.2025.117049","url":null,"abstract":"<div><div>Na<sub>5</sub>YSi<sub>4</sub>O<sub>12</sub> (NYSO) is known as a fast sodium-ion conductive oxide with both high ionic conductivity above 1 mS cm<sup>−1</sup> at room temperature and excellent electrochemical stability against sodium metal anode, making it promising for solid-state sodium battery application. In this study, we investigated the influence of non-stoichiometry in the precursor composition on the crystal phase, microstructure and ionic conducting property of NYSO. It is found that NYSO prepared from the precursor with slight sodium-deficient composition showed the highest total (bulk + grain boundary) conductivity of 2.8 mS cm<sup>−1</sup> at room temperature, which is superior to NYSO with stoichiometric precursor composition (∼ 1 mS cm<sup>−1</sup>). Although excess Na deficiency in the precursor results in the formation of Na<sub>3</sub>YSi<sub>3</sub>O<sub>9</sub> phase, it does not influence so much on the sinterability and grain-boundary resistance of NYSO. Mitigation of Na<sub>9</sub>YSi<sub>6</sub>O<sub>18</sub> phase formation during the fabrication is very important for the densification and reduction of grain-boundary resistance in NYSO ceramic electrolyte.</div></div>","PeriodicalId":431,"journal":{"name":"Solid State Ionics","volume":"432 ","pages":"Article 117049"},"PeriodicalIF":3.3,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145323002","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Solid State IonicsPub Date : 2025-12-01Epub Date: 2025-10-15DOI: 10.1016/j.ssi.2025.117042
Jonathan Perry, Jafar Zanganeh, Behdad Moghtaderi
{"title":"Direct electrochemical ammonia synthesis from water and air via solid-state protonic electrochemical cells – A critical review","authors":"Jonathan Perry, Jafar Zanganeh, Behdad Moghtaderi","doi":"10.1016/j.ssi.2025.117042","DOIUrl":"10.1016/j.ssi.2025.117042","url":null,"abstract":"<div><div>Solid-state protonic electrochemical cells (SSPECs) are gaining attention as a technology that has great potential for sustainable ammonia (NH₃) synthesis, energy storage, and power generation, while providing seamless integration with renewable energy thereby offering a pathway towards a low-carbon economy. However, challenges remain in achieving industrially relevant NH₃ production rates and overall energy efficiencies required for commercial applications. Key barriers are outlined, including the thermodynamically favoured hydrogen evolution reaction (HER) at the cathode, which limits selectivity and lowers efficiencies. Recent advancements are highlighted including the importance of rational catalyst design, often focusing on functionalisation or defect-engineered sites, and integrated systems optimisation. In particular, co-fed electrochemical nitrogen reduction (eNRR) presents a strategy for enhancing NH<sub>3</sub> yields, while plasma-assisted processes also show promise in increasing both NH₃ production rates and selectivity. Furthermore, the lack of consistent ammonia detection methods has been outlined as a critical variable in comparative performance evaluation, which significantly impacts robust benchmarking of new catalyst and system designs. Despite these current limitations, SSPECs present a compelling opportunity for converting renewable electricity into liquid fuels, with significant potential for scaling solid-state protonic eNRR.</div></div>","PeriodicalId":431,"journal":{"name":"Solid State Ionics","volume":"432 ","pages":"Article 117042"},"PeriodicalIF":3.3,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145322998","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}