The most formidable issues confronting zinc anodes include dendrite formation, hydrogen evolution, corrosion, and the unstable construction of the solid electrolyte interphase (SEI). These problems are not static or isolated; rather, they are highly dynamic, interwoven, and considerably influenced by local chemical and physical environments. Traditional ex situ characterization methods—often limited to observing post-mortem samples—fall short in capturing the real-time evolution of these phenomena, thereby obscuring the understanding of underlying failure mechanisms.

To surmount these obstacles, researchers have progressively turned to advanced in situ and operando characterization techniques, enabling the direct observation of interfacial processes as they unfold under genuine operating conditions. By employing a multidimensional approach that marries imaging, spectroscopy, scattering, diffraction, and mass spectrometry methodologies, scientists can now monitor morphological, chemical, and structural dynamics across a wide spectrum of spatial and temporal scales. This integrative framework supplies unprecedented insight into the nucleation behavior of zinc, the intricate pathways of dendrite growth, and the delicate balance governing SEI formation and stability.

Imaging techniques provide a powerful toolset for visualizing morphological changes and spatial heterogeneities in real-time. Liquid-phase transmission electron microscopy (TEM) allows for the nanoscale observation of zinc deposition behavior within liquid electrolytes, elucidating nucleation sites and growth kinetics directly. Focused ion beam-scanning electron microscopy (FIB-SEM) offers three-dimensional reconstructions that reveal dendrite architecture and failure modes. Synchrotron-based tomography enhances the spatial resolution further, enabling the observation of microstructural evolution with minimal beam damage. Optical microscopy, while more accessible, affords valuable in situ observations of larger-scale phenomena such as dendritic branching and propagation under operando conditions.

Chemical insights complement morphological data by probing the electronic states, bonding environments, and molecular interactions at buried interfaces. Techniques such as Raman and Fourier-transform infrared (FTIR) spectroscopy, including their nano-FTIR variants, decipher the evolving chemical composition of electrolytes, solvation layers, and SEI components. Ambient pressure X-ray photoelectron spectroscopy (AP-XPS) extends this understanding to include surface chemistry under near-realistic conditions, tracking changes in oxidation states and elemental distributions dynamically during battery operation.

Synchrotron-based scattering and diffraction techniques contribute unparalleled detail regarding crystallographic and mesoscale structural changes. X-ray diffraction (XRD) elucidates phase transitions and crystallinity alterations in zinc deposits and additives, while small- and wide-angle X-ray scattering (SAXS/WAXS) offer quantitative data on particle sizes and shape distributions. X-ray absorption fine structure (XAFS) spectroscopy delivers atomic-level information on local coordination environments and chemical state changes, helping to decode the effects of electrolyte additives and operational parameters on zinc nucleation and growth.

Complementing these structural and chemical probes are mass spectrometry approaches tailored for interfacial studies. Electrochemical quartz crystal microbalance (EQCM) tracks subtle mass variations correlated with electrode reactions, enabling quantification of deposition and dissolution processes with exquisite sensitivity. Gas chromatography-mass spectrometry (GC-MS) and differential electrochemical mass spectrometry (DEMS) detect gaseous byproducts such as hydrogen, mapping parasitic reactions that degrade battery efficiency. These techniques provide critical kinetic data, allowing researchers to correlate reaction routes with evolving interface conditions in real-time.

When integrated judiciously, these multimodal analytical technologies chart a comprehensive picture of the zinc anode interface, bridging the gap from atomic rearrangements to macroscopic performance losses. Such an understanding clarifies the synergistic roles of nucleation kinetics, dendrite suppression mechanisms, and the formation dynamics of protective interphases. Importantly, this knowledge informs rational design principles for electrolyte formulations, where solvation structures and additive chemistries are engineered to foster stable interfacial environments. Similarly, it drives innovation in protective coating strategies and artificial SEI layers aimed at mitigating dendritic growth and enhancing cycling durability.

Looking forward, the convergence of advanced characterization tools with emerging machine learning algorithms and theoretical modeling holds immense promise. By leveraging multimodal data fusion and predictive simulations, researchers aim to transcend current spatial and temporal resolution limitations, unpacking the full complexity of interfacial processes in zinc-ion batteries. Automated high-throughput characterization combined with data-driven models could accelerate discovery pipelines, enabling the swift optimization of material systems and operational protocols.

Ultimately, these multidisciplinary efforts aspire not only to enhance fundamental comprehension of battery interfaces but also to translate such insights into commercial products that deliver durable, dendrite-free, and high-performance aqueous zinc-ion batteries. As global energy demands intensify alongside urgent environmental imperatives, harnessing this knowledge will be critical for realizing scalable, safe, and cost-effective energy storage solutions integral to the renewable energy ecosystem.

The ongoing research accentuates the profound impact of coupling real-time observation techniques with chemical and structural probes to untangle the complexities of electrode/electrolyte interactions—an endeavor pivotal to the future of sustainable energy technologies. The interplay between advanced characterization, materials science, and electrochemistry is redefining how scientists approach the persistent challenges of energy storage, hastening breakthroughs that could reshape the landscape of power systems worldwide.

In summary, the deployment of multiscale advanced characterization techniques is revolutionizing our understanding of the zinc anode interface in aqueous zinc-ion batteries. By capturing dynamic interfacial behaviors with atomic precision and chemical specificity under realistic conditions, these tools illuminate pathways to mitigate dendrite growth, suppress side reactions, and stabilize SEI formation. The resultant framework not only enriches fundamental science but also provides a strategic foundation for designing next-generation electrolytes, additives, and protective interfaces, thereby accelerating the practical adoption of zinc-ion batteries as sustainable and dependable energy storage alternatives.

Subject of Research: Advanced characterization techniques for understanding interfacial processes in aqueous zinc-ion batteries.

Article Title: Unlocking the Mysteries of Interfacial Processes in Zinc-ion Batteries through Multiscale Advanced Characterization Techniques

News Publication Date: 22-Dec-2025

Web References: http://dx.doi.org/10.26599/NR.2025.94908045

Image Credits: Nano Research, Tsinghua University Press

Keywords

Zinc-ion batteries, aqueous zinc-ion batteries, interfacial processes, dendrite growth, solid electrolyte interphase, in situ characterization, operando techniques, transmission electron microscopy, synchrotron scattering, spectroscopy, mass spectrometry, electrolyte engineering

In a groundbreaking study, researchers from the School of Metallurgy and Environment at Central South University have unveiled an innovative strategy to mitigate the detrimental effects of both dendrite formation and corrosion on zinc anodes. Their approach centers around an advanced concept known as buried interface engineering, which provides a unique solution to these pervasive issues and paves the way for more robust energy storage systems. The researchers collaborated closely with industry experts to develop a layered structure that optimally combines zincophilic and corrosion-resistant materials.

The core of this strategy involves the incorporation of a zincophilic tin (Sn) layer situated within a protective zinc sulfide (ZnS) outer layer. The ZnS layer is crucial, acting as a barrier to protect the newly deposited zinc from the corrosive effects of the electrolyte. Meanwhile, the Sn layer adopts a unique role by possessing an inherent affinity for zinc atoms, which facilitates their nucleation and subsequent smooth deposition. This dual-layer structure aims to enhance the overall stability and efficiency of zinc anodes under operational conditions, representing a significant leap over conventional zinc anodes.

Extensive experimental testing has validated the efficacy of the proposed SZS coating, demonstrating several advantages over traditional bare zinc systems. During symmetric cell testing, the SZS-coated zinc anode operated remarkably well, showcasing stable cycling performance that exceeded 280 hours at a current density of 10 mA cm^-2 and an areal capacity of 10 mAh cm^-2. This remarkable result starkly contrasts with that of bare zinc, which could only endure for approximately 41 hours under identical conditions.

Moreover, the performance of full cells such as SZS@Zn//MnO₂ has shown remarkable long-term cycling stability. The SZS@Zn configuration achieved a cycling stability of 63.6% after 1000 cycles at a high discharge rate of 10C, a significant enhancement compared to bare zinc’s 47.2% stability. These results provide compelling evidence that buried interface engineering can substantially improve the performance and durability of zinc-ion batteries.

The researchers performed meticulous observations and analyses of the morphology and composition of the anode both before cycling experiments and after extended use. The findings revealed that the SZS-coated zinc anode exhibited a uniform deposition of zinc and suffered considerably less corrosion compared to its bare counterpart. These observations underline the effectiveness of the innovative coating in fostering a more conducive environment for zinc deposition and reducing the adverse impacts of corrosion.

Additionally, the approach taken by the research team illuminates possibilities for further advancements in energy storage technology. By offering valuable insights into the rational design of stable interfaces for metal anodes, the buried interface engineering strategy opens new avenues for developing more efficient, reliable, and long-lasting batteries. This innovation not only addresses the immediate issues of dendrite growth and corrosion but also contributes to the broader challenge of improving battery technologies for diverse applications.

The ramifications of this research extend beyond mere laboratory results. The findings hold great significance for the future of energy storage solutions and could potentially affect various sectors, including renewable energy, electric vehicles, and portable electronic devices. With sustainability and efficiency being paramount concerns in today’s rapidly advancing technological landscape, such advancements are critical for the future success of energy storage systems.

Funding and support from several prominent agencies, including the National Natural Science Foundation of China and local innovation programs, were instrumental in bringing this project to fruition. Such collaborations underscore the integral role of academic and governmental support in driving forward critical research initiatives aimed at addressing global energy challenges.

Given the extensive nature of this study and the promising outcomes, further research and development initiatives are warranted to fully understand and exploit the capabilities of buried interface engineering in aqueous zinc-ion batteries. The research team is optimistic about the potential of their findings to usher in a new era for energy storage technologies.

In conclusion, the research conducted by the team from Central South University marks a significant advancement in the quest to overcome the challenges associated with aqueous zinc-ion batteries. By implementing an innovative buried interface engineering strategy, they have offered a solution that not only enhances the performance and durability of zinc anodes but also provides valuable insights for future technological developments in this critical field of study.

Subject of Research: Buried interface engineering for zinc anodes in aqueous zinc-ion batteries
Article Title: Novel Buried Interface Engineering Mitigates Dendrite Growth and Corrosion in Zinc Anodes
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Web References: [Insert Web References]
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Image Credits: Credit: ©Science China Press

Keywords

Dendrite growth, corrosion, zinc-ion batteries, buried interface engineering, energy storage, zincophilic layer, zinc sulfide layer, battery performance, cycling stability, research collaboration