Nano Energy最新文献

{"title":"Ultrasensitive Sn-Pb perovskite photodetector for monolithic near-infrared imaging","authors":"Haotian Bao ,&nbsp;Yuxuan Sun ,&nbsp;Liang Chu ,&nbsp;Jingjing Liu ,&nbsp;Zhihao Chen ,&nbsp;Guofeng Zhang ,&nbsp;Ruiyun Chen ,&nbsp;Changgang Yang ,&nbsp;Jiang Wang ,&nbsp;Suotang Jia ,&nbsp;Chengbing Qin ,&nbsp;Liantuan Xiao ,&nbsp;Zhichun Yang","doi":"10.1016/j.nanoen.2026.111705","DOIUrl":"10.1016/j.nanoen.2026.111705","url":null,"abstract":"<div><div>Tin-lead (Sn-Pb) perovskites exhibit great potential in application of near-infrared (NIR) photodetectors due to their narrow optical bandgap of ∼1.2 eV. However, their inferior stability caused by the oxidation of Sn²⁺ to Sn⁴⁺ and the film defects still limit the device performance. Herein, we introduced ammonium chloride (NH₄Cl) into the precursor ink to regulate the crystallization dynamics of Sn-Pb perovskite film, suppress the oxidation of Sn²⁺, and passivate the associated defects. Consequently, the photodetector achieves a wide spectral response spanning 300–1100 nm, along with an impressive specific detectivity of 1.42 × 10¹¹ Jones, a linear dynamic range of 173 dB, and an ultrafast rise/fall time of 377/860 ns. The optimal device exhibits a negligible performance attenuation after stressed under continuous on/off NIR radiation at 980 nm for 120 min. Furthermore, we integrate the photodetector with a commercial transistor readout circuit for imaging, which delivers an outstanding imaging quality under NIR radiation with a spatial resolution of 1.67 lp mm⁻¹ . This work paves an avenue for the development of advanced NIR imager and the commercialization of Sn-Pb perovskite semiconductors for intelligent consumer electronics.</div></div>","PeriodicalId":394,"journal":{"name":"Nano Energy","volume":"149 ","pages":"Article 111705"},"PeriodicalIF":17.1,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145920544","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Harvesting and utilizing environmental ubiquitous magnetic energy","authors":"Jiaxin Yu ,&nbsp;Shijie Zhai ,&nbsp;Baichuan Leng ,&nbsp;Chaoyu Yang ,&nbsp;Ruixiang Feng ,&nbsp;Xiaojun Cheng ,&nbsp;Jingwen Liu ,&nbsp;Fan Jiang ,&nbsp;Jun Du ,&nbsp;Xiaosong Zhang ,&nbsp;Hengyu Li ,&nbsp;Tinghai Cheng","doi":"10.1016/j.nanoen.2025.111691","DOIUrl":"10.1016/j.nanoen.2025.111691","url":null,"abstract":"<div><div>Harvesting magnetic energy generated by current during wire transmission and equipment application provides new insights for alleviating the energy issues and promoting the development of self-powered sensors. To fully exploit the potential of magnetic energy, efficient magnetic energy harvesting and conversion technologies are indispensable. Therefore, this paper provides a comprehensive overview of the characteristics and advancements in various magnetic energy harvesting technologies. In this work, we started with the magnetic energy harvesting environments and divided them into two types based on distribution characteristics: regular fields from high-voltage lines and stray fields in low-voltage environments. Through analysis of these categories, the diversity of magnetic energy distribution and the feasibility of harvesting were explained. Then, based on their energy conversion mechanisms, we categorize existing magnetic energy harvesting technologies into magneto-mechano-electric and magneto-electric harvesting technologies and provide an in-depth analysis of their underlying principles and historical development. Finally, this paper summarizes the current challenges in magnetic energy harvesting technologies and offers a well-grounded perspective on performance optimization strategies and future developmental directions for them.</div></div>","PeriodicalId":394,"journal":{"name":"Nano Energy","volume":"149 ","pages":"Article 111691"},"PeriodicalIF":17.1,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145895243","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Delayed luminescence in sub-5 μm InGaN/GaN fin-LEDs with efficiency enhancement by UV-induced moisture adsorption","authors":"SeungJe Lee ,&nbsp;Sangwon Nam ,&nbsp;Jin Il Jang ,&nbsp;Yuna Kwon ,&nbsp;Huiyeong Kang ,&nbsp;Yong Jae Lee ,&nbsp;Keyong Nam Lee ,&nbsp;Gang Yeol Yoo ,&nbsp;Changwook Kim ,&nbsp;Hyun Min Cho ,&nbsp;Hyung Min Kim ,&nbsp;Heesun Yang ,&nbsp;Jae Kyu Song ,&nbsp;Young Rag Do","doi":"10.1016/j.nanoen.2026.111746","DOIUrl":"10.1016/j.nanoen.2026.111746","url":null,"abstract":"<div><div>High costs and efficiency degradation from surface defects in small-chip top-down fabrication impede micro-light-emitting diodes commercialization. To address this, we introduce Ultraviolet-irradiated moisture adsorption as a novel top-down approach, integrated with defect-reducing etching, to enhance ultra-small micro-light-emitting diodes. Ultraviolet-irradiated moisture adsorption is crucial: it effectively reduces surface strain caused by dangling and oxidized bonds through moisture adsorption, thereby facilitating significant delayed luminescence <em>via</em> detrapping from shallow trap states. This mechanism profoundly improves the internal quantum efficiency of ultra- micro-light-emitting diodes and the external quantum efficiency of light-emitting diode devices. Our approach, including defect-removal and strain-alleviation, yielded highly promising results for sub-5 μm fin- light-emitting diodes, achieving an internal quantum efficiency of 70.9 % and an external quantum efficiency of 16.5 %. By actively leveraging delayed luminescence through Ultraviolet-irradiated moisture adsorption, these methods offer a cost-effective and highly efficient solution, holding great potential for future micro-light-emitting diodes display commercialization.</div></div>","PeriodicalId":394,"journal":{"name":"Nano Energy","volume":"149 ","pages":"Article 111746"},"PeriodicalIF":17.1,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146014738","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Engineering weak solvation in localized water-in-salt electrolyte with hydrated-ion-sieving carbon pores for ultralow-temperature Zn-ion hybrid capacitors","authors":"Yingmeng Zhang ,&nbsp;Song Yao ,&nbsp;Huanqing Cui ,&nbsp;Huan Mei ,&nbsp;Zhibin Yan ,&nbsp;Long Ren ,&nbsp;Ziquan Wang ,&nbsp;Jianhui Zhu ,&nbsp;Libo Deng ,&nbsp;Manlin Tan ,&nbsp;Xiaoqiang Chen ,&nbsp;Xiaojun Peng ,&nbsp;Hui Ying Yang ,&nbsp;Lei Yao","doi":"10.1016/j.nanoen.2026.111720","DOIUrl":"10.1016/j.nanoen.2026.111720","url":null,"abstract":"<div><div>The application of aqueous Zn-ion hybrid capacitors (AZHCs) at extreme temperatures is hindered by electrolyte freezing, sluggish cation de-solvation, and low power/energy densities. Herein, we propose a novel weakly-solvating “localized water-in-salt” (<em>ws</em>-LWIS) electrolyte strategy that synergizes the advantage of LWIS electrolytes and <em>ws</em>-electrolytes. The <em>ws</em>-LWIS electrolyte creates a simultaneous weak solvation structure and LWIS structure by introducing acetonitrile into the zinc perchlorate electrolyte. By optimizing the water content and solvation structure, the adverse impact of low temperature on diffusion and de-solvation kinetics of Zn^2 + ions are mitigated. Consequently, a broad electrochemical stability window (0 −2.5 V) and boosted fast-charging/discharging cycling stability (88.2 % of initial capacity at 10 A/g after 3000 cycles) at −50 °C are achieved. AZHCs deliver a specific capacity of 165.1 F/g under a current density of 1.0 A/g at −50 °C, retaining 88.2 % of the capacity at 25 °C. Notably, the device achieves an energy density of 143.3 Wh/kg (2.6 times that of conventional WIS electrolytes) and a power density of 2.5 kW/kg at −50 °C. Even at a 10-fold higher power density, the energy density remains as high as 66.5 Wh/kg, superior to state-of-the-art performance of AZHCs under similar conditions.</div></div>","PeriodicalId":394,"journal":{"name":"Nano Energy","volume":"149 ","pages":"Article 111720"},"PeriodicalIF":17.1,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145974579","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Multifunctional ultra-low voltage sweat-activated battery using piezo-ionic hydrogel","authors":"Mustehsan Beg ,&nbsp;Vishnu Sam ,&nbsp;Jithin Kanathedath,&nbsp;Prasutha Rani Markapudi,&nbsp;Keith M. Alcock,&nbsp;Keng Goh,&nbsp;Hongnian Yu,&nbsp;Libu Manjakkal","doi":"10.1016/j.nanoen.2026.111729","DOIUrl":"10.1016/j.nanoen.2026.111729","url":null,"abstract":"<div><div>Optimising ultra-low voltage with high capacity in batteries presents a challenge for emerging applications, such as wearable technology. In this study, we developed a multifunctional ultra-low voltage, sweat-activated fabric battery (SFB) using a biomaterial-based piezo-ionic hydrogel from water hyacinth carboxymethyl cellulose, mitigating risks of high-power and toxic materials near human skin. The SFB's multi-layer active material enhances conductivity and reduces resistance, enabling a 1 cm² device to discharge for 10 + h below 0.4 V, with an areal capacity of 4.1 mAh cm⁻² at 400 μA cm⁻². Furthermore, SFB with piezo-ionic hydrogel, when affixed to the elbow, generates a peak current of 115 nA cm⁻² as the elbow is fully flexed. Consequently, SFB can be utilised for energy storage, along with force and bending sensing. This study opens new avenues in advancing research on ultra-low voltage batteries for wearable and biomedical devices.</div></div>","PeriodicalId":394,"journal":{"name":"Nano Energy","volume":"149 ","pages":"Article 111729"},"PeriodicalIF":17.1,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145974581","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Synergistic integration of in situ Grown ZIF-71 and organic additives toward a stable cooperative interface in advanced aqueous zinc-ion batteries","authors":"Zinan Wang ,&nbsp;Zhengping Sun ,&nbsp;Peng Wang ,&nbsp;Xiaoyu Yang ,&nbsp;Tianxu Ji ,&nbsp;Shuchang Wei ,&nbsp;Yangfan Niu ,&nbsp;Wei Duan ,&nbsp;Ying Yue ,&nbsp;Yunpeng Liu ,&nbsp;Yang Ju","doi":"10.1016/j.nanoen.2026.111717","DOIUrl":"10.1016/j.nanoen.2026.111717","url":null,"abstract":"<div><div>Aqueous zinc-ion batteries (AZBs) hold great promise for sustainable energy storage; however, their performance remains constrained by the interfacial instability of the Zn anode, which leads to parasitic hydrogen evolution, dendritic deposition, and surface corrosion. Inspired by the selective uptake of polar molecules by plant root hairs, this study proposes a bioinspired strategy involving the in situ growth of a hydrophobic–ethanolophilic ZIF-71 interlayer coupled with an ethylene glycol (EG) additive. The hydrophobic Cl groups in ZIF-71 repel water molecules to suppress side reactions, while its porous structure selectively adsorbs EG to form a \"Zn^2 + –EG–ZIF-71\" coordination bridge that promotes desolvation and directed ion migration. Theoretical calculations reveal that the negatively charged regions associated with the Cl groups in ZIF-71 pores exhibit a stronger adsorption affinity for EG, promoting preferential molecular enrichment. Molecular dynamics simulations further confirm that EG molecules enter the Zn²⁺ solvation sheath, reconstructing [Zn(H₂O)₆]²⁺ into [Zn(H₂O)₅(EG)]²⁺, thereby accelerating desolvation and facilitating uniform Zn deposition. This synergistic mechanism enables the ZIF-71@Zn(+EG) symmetric coin cell to operate stably for over 5000 h at 2 mA cm⁻², and a pouch cell to function for 4000 h at 3 mA cm⁻² without noticeable swelling. Moreover, the ZIF-71@Zn(+EG)//AlVO-NMP full cell achieved a capacity retention of 73.8 % after 4000 cycles at 5 A g⁻¹. This work provides valuable insights and a feasible solution for constructing highly stable AZBs through the cooperative regulation of interfacial chemistry and solvation structure.</div></div>","PeriodicalId":394,"journal":{"name":"Nano Energy","volume":"149 ","pages":"Article 111717"},"PeriodicalIF":17.1,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145974583","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Interface cooperative Pt-CoNi LDH for urea-assisted energy-saving hydrogen production under ampere-level current density","authors":"Huilin Zhao ,&nbsp;Xiaojun Wang ,&nbsp;Fengyuan Tian ,&nbsp;Weiping Xiao ,&nbsp;Junwu Liang ,&nbsp;Wenli Yu ,&nbsp;Tianyi Ma ,&nbsp;Lei Wang ,&nbsp;Zexing Wu","doi":"10.1016/j.nanoen.2026.111728","DOIUrl":"10.1016/j.nanoen.2026.111728","url":null,"abstract":"<div><div>Engineering bifunctional electrocatalysts featuring promoted adsorption for multiple intermediates and reactants via interface modulation strategies is critical for urea-assisted water splitting toward sustainable energy conversion. However, exploring efficient bifunctional electrocatalysts capable of driving both the hydrogen evolution reaction (HER) and urea oxidation reaction (UOR) at high current densities remains challenging. Herein, a self-supported bifunctional electrode is constructed on nickel foam, where the cooperative CoNi LDH is decorated with low-content Pt nanospheres (Pt-CoNi LDH/NF) for urea-assisted H₂ production. The strong metal-support interaction (SMSI) and multi-metal synergy collectively regulate the adsorption/desorption behavior of key reaction species, thereby lowering the energy barrier for the rate-determining step and improving overall catalytic efficiency. The optimized catalyst exhibits substantially reduced potentials of 1.32 V (UOR) and −30 mV (HER) to reach 10 mA cm⁻². A urea-assisted electrolytic cell merely requires 1.36 V to afford 10 mA cm⁻². Notably, in a practical anion-exchange membrane (AEM) electrolyzer configuration, the Pt-CoNi LDH/NF electrode maintains stable at 2 A cm⁻², while preserving high UOR/HER bifunctional activity. This study develops an integrated approach that couples urea-containing wastewater remediation with energy-efficient hydrogen production.</div></div>","PeriodicalId":394,"journal":{"name":"Nano Energy","volume":"149 ","pages":"Article 111728"},"PeriodicalIF":17.1,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145995969","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Interface-engineered mixed-dimensional GaS/GaN heterojunction for low-noise ultraviolet photodetector and imaging","authors":"Yutian Lin ,&nbsp;Wenfeng Li ,&nbsp;Siyu Zhou ,&nbsp;Zexin Dong ,&nbsp;Zhiyuan Zhang ,&nbsp;Yuqing Yang ,&nbsp;Ying Yu ,&nbsp;Ping Liu ,&nbsp;Xingfu Wang ,&nbsp;Zhihong Zhu","doi":"10.1016/j.nanoen.2026.111738","DOIUrl":"10.1016/j.nanoen.2026.111738","url":null,"abstract":"<div><div>Interface engineering is an effective strategy for enhancing the performance of optoelectronic devices. In this work, we develop a reliable interface modulation approach specifically for III-nitride materials by fabricating low-dark-current GaS/GaN heterojunction ultraviolet (UV) photodetectors (PDs) with controlled polarity and dimensionality, thereby improving both responsivity and detectivity. Compared with Ga-polar devices, the N-polar heterojunction PDs exhibit markedly superior performance: the responsivity increases from 1.13 mA/W to 143 mA/W, the specific detectivity improves from 3.4 × 10⁸ Jones to 6.58 × 10¹⁰ Jones, and the linear dynamic range is enhanced from 19 to 50 dB. Simulation results of the two heterojunction interfaces reveal that these performance enhancements arise from a stronger built-in electric field in the N-polar heterojunction, which facilitates more efficient separation of photogenerated electron-hole pairs. Furthermore, we investigate the potential of these devices for low-noise UV optical imaging, enabled by their low dark current and ultra-low NEP. Overall, this work demonstrates an effective strategy for tuning the performance of III-nitride heterojunctions and highlights their strong potential for low-noise UV detection applications.</div></div>","PeriodicalId":394,"journal":{"name":"Nano Energy","volume":"149 ","pages":"Article 111738"},"PeriodicalIF":17.1,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146001582","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Low-power and non-volatile multi-level synaptic weight update characteristics in self-selecting Nb2O5/CeO2 memristor crossbar array for in-memory computing system","authors":"Kitae Park ,&nbsp;Hanju Ko ,&nbsp;Peter Hayoung Chung ,&nbsp;Jiyeon Ryu ,&nbsp;Sola Moon ,&nbsp;Tae-Sik Yoon","doi":"10.1016/j.nanoen.2026.111739","DOIUrl":"10.1016/j.nanoen.2026.111739","url":null,"abstract":"<div><div>Non-filamentary valence change memory (VCM)-type memristors are considered the promising candidates as artificial synapses for in-memory computing systems to achieve high energy-efficient computing due to their analog or multi-level conductance change for training operations. However, their poor retention properties originating from unintended diffusion of redistributed oxygen ions limit their application only to the training operation, because the inference operation requires non-volatile retention of updated weights. In this study, non-volatile retention with multi-level synaptic weight update characteristics is demonstrated in non-filamentary bi-layered memristor with cerium oxide (CeO₂) and niobium oxide (Nb₂O₅), i.e., Nb₂O₅/CeO₂, where CeO₂ acts as switching layer and Nb₂O₅ serves as an oxygen ion-holding layer. Due to their high oxygen-ion conductivity and active oxygen-ion exchange property, the memristor enables polarity-dependent, linear, and symmetric analog conductance changes as weight updates, while operating stably at low power with a current range of 0.5–500 nA at + 1.5 V or below. Notably, the device exhibits long-term retention of updated weights enabling discrimination of multi-level states via stably holding oxygen ions in Nb₂O₅ layer. In addition, by employing Nb₂O₅/CeO₂ bi-layered structure, it achieves self-selecting characteristics from asymmetric Schottky contacts at oxide/electrode interfaces as well as high non-linearity ratio in half-bias operation scheme, which minimizes write disturbance and sneak current in selector-free crossbar array architecture. Using the obtained weight update characteristics, pattern recognition accuracy is simulated to be 96.6 % for MNIST handwritten patterns using CrossSim program. These linear, symmetric, and analog non-volatile conductance change with low power consumption as well as self-selecting behaviors of bi-layered Nb₂O₅/CeO₂ memristor crossbar array confirms the potential of the proposed device to be applicable to integrated in-memory computing systems that implement both efficient training and inference operations.</div></div>","PeriodicalId":394,"journal":{"name":"Nano Energy","volume":"149 ","pages":"Article 111739"},"PeriodicalIF":17.1,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146001568","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Discovery of a new phase transition and high-valent redox mechanism in Fe-substituted Na2Mn3O7","authors":"Hugh Barrett Smith ,&nbsp;Bachu Sravan Kumar ,&nbsp;Anirudh Adavi ,&nbsp;Willem Vanmoerkerke ,&nbsp;Ming Lei ,&nbsp;Tong Wu ,&nbsp;Jorge Moncada ,&nbsp;Hui Zhong ,&nbsp;Jianming Bai ,&nbsp;Adrian Hunt ,&nbsp;Iradwikanari Waluyo ,&nbsp;Eli Stavitski ,&nbsp;Loza F. Tadesse ,&nbsp;Iwnetim Iwnetu Abate","doi":"10.1016/j.nanoen.2026.111737","DOIUrl":"10.1016/j.nanoen.2026.111737","url":null,"abstract":"<div><div>Sodium-ion batteries are a promising lower-cost alternative to lithium-ion batteries, but further improvements in electrochemical performance are required. One strategy to increase capacity is to enable reversible high-valent cationic and anionic redox in layered cathode materials; however, this is typically accompanied by structural degradation. Here, we elucidate the mechanism by which Fe-doped Na₂Mn₃O₇, featuring ordered transition metal-vacancies, achieves reversible high-valent redox. Using Mössbauer spectroscopy, soft X-ray absorption spectroscopy (XAS), and in-situ hard XAS, we demonstrate reversible high-valent cationic redox involving both Fe and Mn while in-situ Raman confirms the absence of local structural degradation associated with oxygen redox. Combining in-situ X-ray diffraction with theoretical calculations, we further identify a previously unreported global phase transition from the <span><math><mrow><mi>P</mi><mover><mrow><mn>1</mn></mrow><mo>̅</mo></mover></mrow></math></span> to the <span><math><mrow><mi>P</mi><msub><mrow><mn>2</mn></mrow><mrow><mn>1</mn></mrow></msub><mo>/</mo><mi>c</mi></mrow></math></span> space group during electrochemical cycling and develop a physical model describing this structural evolution. These results provide insights for structurally stable layered sodium transition metal oxide cathodes with reversible high-valent redox.</div></div>","PeriodicalId":394,"journal":{"name":"Nano Energy","volume":"149 ","pages":"Article 111737"},"PeriodicalIF":17.1,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146014741","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}