Shangchao Xiong,Jianjun Chen,Nan Huang,Tao Yan,Yue Peng,Junhua Li
The degradation of catalyst properties, rather than the deposition of NH 4 Cl, was the main reason for the deactivation of the MnCe low-temperature SCR (selective catalytic reduction) catalyst under HCl atmosphere. Cl ions prefer to be located at the oxygen vacancies around Mn cations on the MnCe surface. The adsorbed Cl ions could further promote the formation of oxygen vacancies. Therefore, the active Mn sites on the surface of MnCe would be quickly covered by Cl ions when HCl was present and thus promote the formation of Brønsted acid sites. However, the ionic NH 4 + adsorbed on the Brønsted acid sites of MnCe and MnCe − Cl were not fully utilized in the SCR reaction. Meanwhile, the reactivity of the coordinated NH 3 bonded with Lewis acid sites was significantly restrained by HCl due to the significant inhibition of the redox performance. Overall, HCl could obviously restrain the low-temperature SCR activity of MnCe.
Piezoelectric biomaterials hold immense potential for next-generation microdevices, yet their piezoelectric performance often trails behind that of conventional synthetic counterparts. This study demonstrates a dual-scale polarization strategy to significantly enhance the piezoelectric response of d-phenylalanine derivatives (d-PheAD). Molecular-level polarization is amplified through ionic interactions with l-glutamic acid-modified Fe3O4 magnetic nanoparticles, while macroscopic alignment of d-PheAD nanoarrays under magnetic fields optimizes collective dipole orientation. This synergistic approach elevates the effective piezoelectric coefficient (deff) from 10.4 to 121.9 pm V–1, outperforming most biomaterial-based piezoelectric systems and many inorganic piezoelectric systems. Integrating these engineered assemblies into a triboelectric-enhanced piezoelectric nanogenerator yields unprecedented electrical outputs (2853 nA, 51.9 V), a 25-fold improvement over baseline configurations. The device achieves real-time detection of trace HCl gas at low concentrations, demonstrating superior sensitivity compared to commercial electrochemical sensors. By bridging molecular design and macroscopic engineering, this work establishes a scalable paradigm for deploying eco-friendly piezoelectric biomaterials in high-performance microelectronics and environmental monitoring technologies.
危险品化学品经营许可证（带存储）