Two-Dimensional Hybrid SnO 2 @WO 3 Nanosheets Synthesized by Polyoxometallate Cluster–Nucleus Coassembly for Highly Efficient H 2 Detection

作者：Jinwu Hu, Tao Xu, Jin Lin, Zijun Hong, Zhijie Song, Zhe Kong, Huijun Li, Qiaobo Liao, Jingcheng Xu, Guisheng Li, Kaiping Yuan, Ding Wang · 发表于：ACS Sensors · 年份：2025 · DOI：10.1021/acssensors.5c02189 · 被引用次数：10 · 研究领域：Gas Sensing Nanomaterials and Sensors、Advanced Photocatalysis Techniques、Advanced Nanomaterials in Catalysis

Hydrogen’s extreme flammability and propensity for undetected leaks pose critical safety hazards in renewable energy and industrial systems, yet noble-metal-free sensors face intrinsic limitations in response kinetics and stability. Herein, we report a noble-metal-free hydrogen-sensitive SnO 2 @WO 3 hexagonal nanosheets synthesized via a cluster–nucleus coassembly strategy. The bottom-up coassembly approach directs the interfacial self-assembly of WO 3 clusters and SnO 2 nuclei, enabling atomic-level coupling at the heterointerface. The SnO 2 @WO 3 heterointerface modulates the W coordination environment, amplifying oxygen vacancy (O v ) density compared to that of pristine SnO 2 . Remarkably, the sensor based on SnO 2 @WO 3 exhibited unique H 2 gas sensing properties in the absence of catalytic sensitization of noble metals, including a high response value ( R a / R g = 12.06 for 1000 ppm of H 2 ), rapid response time (8 s), excellent selectivity, and long-term stability and durability. The synergy of the two-dimensional nanosheet morphology and interfacial O v -rich heterojunction facilitates efficient gas diffusion, charge transfer, and dissociation. The H 2 adsorption (−1.367 eV) and O 2 dissociation (−0.767 eV) at interfacial O v sites explain the performance enhancement. Furthermore, we present a fully integrated wireless sensor module for real-time H 2 monitoring with smartphone visualization via Bluetooth. In addition, we also demonstrated how a sensor-integrated smar...