Key Takeaways & Executive Findings
- •• Single-atom nano-islands architecture enables “moving but not aggregation” of single atoms, fundamentally overcoming the inherent activity-stability trade-off in single-atom catalysts. • Systematic synthesis strategies and multi-scale stabilization mechanisms for single-atom nano-islands are detailed, including one-step and two-step approaches, alongside electronic structure modulation via nano-island interactions. • Single-atom nano-islands demonstrate exceptional performance across diverse catalytic applications, including batteries, clean energy production, chemical synthesis, and environmental catalysis, establishing robust structure-activity relationships. • This review establishes a closed-loop cognitive framework encompassing models, synthesis, high stability mechanisms, high activity essence, and applications, driving a paradigm shift in understanding the multi-dimensional advantages of SANIs.
Abstract
Single-atom catalysts (SACs) are among the most cutting-edge catalysts in the multiphase catalysis track due to their unique geometrical and electronic properties, the highest atom utilization efficiency, and uniform active sites. SACs have been facing an unresolved problem in practical applications: the opposing contradiction of activity-stability. The successful development of single-atom nano-islands (SANIs) cleverly combines the ultra-high atom utilization efficiency of SACs with the confinement effect and structural stability of nano-island structures, realizing the “moving but not aggregation” of SACs, which fundamentally solves this inherent contradiction. Although research on the precise loading of single atoms on nano-islands continues to advance, existing reviews have not yet established a closed-loop cognitive framework encompassing “models-synthesis-high stability mechanisms-high activity essence-applications.” This work fills this critical gap by systematically integrating the basic conceptual models and cutting-edge synthesis strategies of SANIs, focusing on revealing the underlying mechanisms by which SANIs overcome the stability bottleneck of SACs, elucidating the role of nano-islands and their synergistic mechanisms to clarify the high activity essence, and establishing the structure–activity relationship between atomic confinement effects and macroscopic performance, ultimately achieving breakthrough validation across catalytic systems. This review aims to open new perspectives, drive a paradigm shift in understanding the multi-dimensional advantages of SANIs, and thereby spur breakthrough progress in this frontier field.
1. Introduction
In 2011, Zhang et al. immobilized isolated Pt atoms onto iron oxide (FeOx) (Pt1/FeOx) to show extraordinary catalytic performance for CO oxidation, and proposed the concept of “single-atom catalysts (SACs)” in the field of heterogeneous catalysis for the first time [1]. As soon as the concept of SACs was proposed, it has rapidly developed into one of the most active research frontiers in the field of multiphase catalysis and attracted extensive attention from both academia and industry [2–10]. The “soul idea” of SACs lies in the individual immobilization of catalytically active metal atoms on support materials through precisely designed ligand/ion interactions between neighboring atoms [11]. This atomic-scale dispersion strategy maximizes the utilization efficiency of each metal atoms, significantly improving both catalytic activity and reaction selectivity while optimizing catalytic process efficiency [12–15].
However, SACs face an inherent thermodynamic dilemma, as their extremely ultra-high surface free energy makes them highly susceptible to atomic agglomeration and sintering under high-temperature or reducing operational conditions, leading to structural collapse and a sharp decline in catalytic performance [16–18]. To address the stability issues of SACs, researchers have explored various strategies, including utilizing surface defects [19–22], using N-doped carbon (CN)/oxide supports [23–28], and employing metal-support interactions (MSIs)-based electronic/chemical anchoring strategies to stabilize single atoms (SAs) [29–33], to optimize the coordination environment of SAs and enhance their stability. The activity and stability of SACs are inherently contradictory due to their atomically dispersed structure. High activity stems from the unsaturated coordination environment of isolated metal atoms, while stability requires enhanced MSIs. This fundamental contradiction makes it difficult to achieve both high activity and structural robustness in SACs, thereby becoming the core constraint on their development.
This inherent paradox could be fundamentally resolved if SACs were able to achieve “moving but not aggregating” behavior. With this in mind, the research...
Loading authentic research manuscript (Pages 1–5)...
Xinyu Liu, Suhua Chen, Shenglian Luo, Bo Li, Jiajie Wang, Gaoxia Zhang, Yuqi Zhu, Jianping Zou (2026). Bright Sparks of Single-Atom and Nano-Islands in Catalysis: Breaking Activity-Stability Trade-Off. Nano-Micro Letters. https://doi.org/10.1007/s40820-025-01978-9
Research & Educational Purpose Only:The translations, structured abstracts, analytical annotations, and data reports provided by SinoTechIntel are intended exclusively for academic research, internal corporate R&D, and educational benchmarking. They do not constitute formal engineering, chemical safety, legal, or professional advice.
Copyright & Intellectual Property Notice: Original copyright of the underlying source articles and experimental data remains with the respective authors, institutions, and original publishing journals. SinoTechIntel claims intellectual property only over its proprietary translations, analytical syntheses, and AEO structured enhancements in accordance with international fair use and academic citation principles.
Frequently Asked Questions
What are single-atom nano-islands (SANIs) and how do they address the activity-stability trade-off in single-atom catalysts?
SANIs combine the ultra-high atom utilization of single-atom catalysts with the confinement effect and structural stability of nano-islands, enabling 'moving but not aggregation' of single atoms, thus fundamentally overcoming the inherent contradiction between activity and stability.
What synthesis strategies are discussed for single-atom nano-islands?
The review details systematic synthesis strategies including one-step and two-step approaches, along with electronic structure modulation via nano-island interactions.
What are the key applications of single-atom nano-islands?
SANIs demonstrate exceptional performance in batteries, clean energy production, chemical synthesis, and environmental catalysis, establishing robust structure-activity relationships.
What is the main contribution of this review?
It establishes a closed-loop cognitive framework encompassing models, synthesis, high stability mechanisms, high activity essence, and applications, filling a critical gap in the field and driving a paradigm shift in understanding SANIs.
What is the significance of the 'moving but not aggregation' concept?
This concept allows single atoms to migrate without aggregating, preserving high activity while maintaining structural stability, thereby resolving the long-standing activity-stability dilemma in single-atom catalysts.
Related Technical Papers & Translations
Direct Repair of the Crystal Structure and Coating Surface of Spent LiFePO4 Materials Enables Superfast Li-Ion Migration
The rapid accumulation of spent LiFePO4 (LFP) cathodes from retired lithium-ion batteries necessitates the development of effective and environmental-friendly recycling strategies. In this context, direct regeneration has emerged as a promising approach for reclaiming LFP cathode materials, offering a streamlined pathway to restore their electrochemical functionality. We report an integrated regeneration protocol that simultaneously repairs the degraded crystal structure and reconstructs the damaged carbon coating in spent LFP. The regenerated cathode material had superfast lithium-ion diffusion kinetics and a stable cathode–electrolyte interface, giving a remarkable rate capability with specific capacities of 122 mAh g−1 at 5C and 106 mAh g−1 at 10C (1C = 170 mA g−1). It also maintained capacities of 110.7 mAh g−1 (5C) and 84.1 mAh g−1 (10C) after 400 cycles. It could be used in harsh environments and could be stably cycled at subzero temperatures (−10 and −20 °C) and in solid-state electrolyte batteries. Life cycle assessment combined with economic evaluation using the EverBatt model reveals that this direct regeneration approach has high economic and environmental benefits.
Oxide Semiconductor for Advanced Memory Architectures: Atomic Layer Deposition, Key Requirement and Challenges
Oxide semiconductors (OSs), introduced by the Hosono group in the early 2000s, have evolved from display backplane materials to promising candidates for advanced memory and logic devices. The exceptionally low leakage current of OSs and compatibility with three-dimensional (3D) architectures have recently sparked renewed interest in their use in semiconductor applications. This review begins by exploring the unique material properties of OSs, which fundamentally originate from their distinct electronic band structure. Subsequently, we focus on atomic layer deposition (ALD), a core technique for growing excellent OS films, covering both basic and advanced processes compatible with 3D scaling. The basic surface reaction mechanisms—adsorption and reaction—and their roles in film growth are introduced. Furthermore, material design strategies, such as cation selection, crystallinity control, anion doping, and heterostructure engineering, are discussed. We also highlight challenges in memory applications, including contact resistance, hydrogen instability, and lack of p-type materials, and discuss the feasibility of ALD-grown OSs as potential solutions. Lastly, we provide an outlook on the role of ALD-grown OSs in memory technologies. This review bridges material fundamentals and device-level requirements, offering a comprehensive perspective on the potential of ALD-driven OSs for next-generation semiconductor memory devices.
Laser powder bed fusion of biodegradable Zn-4Cu alloy: Processing, microstructure and properties
Zn's natural degradability and biocompatibility make it a promising candidate for implants, however, its mechanical properties remain insufficient for bone applications. In this study, the performance of Zn was enhanced by developing Zn-Cu alloys via laser powder bed fusion (LPBF). Optimal LPBF parameters for forming stable tracks were achieved by adjusting laser power and scanning speed. Under optimized conditions of 100 W and 100 mm/s, high-density (99.58%) Zn-Cu alloys with improved hardness (68.2HV) and yield strength (160 MPa) were achieved. These improvements are attributed to solid solution strengthening, segregation strengthening, and grain refinement. The Zn-Cu alloys also demonstrated favorable degradation behavior, with a rate of 0.16 mm/year. This degradation is primarily driven by micro-galvanic corrosion between the CuZn5 phase and Zn matrix, along with refined grains and increased grain boundary density. This work demonstrates a viable strategy for fabricating Zn-based implants with enhanced structural integrity and mechanical performance via LPBF.