Liwei Chen

Nov 24, 2024 | nature.com | Zhiyuan Li |Yong Huei Wang |Yilin Chen |Xi Liu |Liwei Chen |Kai Wu

AbstractNi-rich layered oxides (LiNixCoyMn1−x−yO2, x > 0.8, NCM) are technologically important cathode (i.e., positive electrode) materials for next-generation high-energy batteries. However, they face challenges in cycle stability and durability due to internal strain accumulation and particle fracture as the batteries cycle. Here we report a simple molten-salt-assisted synthesis route to introduce gradiently distributed pores into the polycrystalline NCM secondary particles.

Oct 3, 2024 | nature.com | Dongrun Xu |Weiye Qu |Liwei Chen |Xingfu Tang |Xi Liu |Guangfeng Wei

AbstractCatalytic activity of metal particles is reported to originate from the appearance of nonmetallic states, but conductive metallic particles, as an electron reservoir, should render electron delivery between reactants more favorably so as to have higher activity. We present that metallic rhodium particle catalysts are highly active in the low-temperature oxidation of carbon monoxide, whereas nonmetallic rhodium clusters or monoatoms on alumina remain catalytically inert.

Sep 19, 2024 | nature.com | Jun Cai |Jian Liu |Yijing Zang |Wujun Shi |Liwei Chen |Xi Liu | +4 more

AbstractPlatinum (Pt) oxides are vital catalysts in numerous reactions, but research indicates that they decompose at high temperatures, limiting their use in high-temperature applications. In this study, we identify a two-dimensional (2D) crystalline Pt oxide with remarkable thermal stability (1,200 K under nitrogen dioxide) using a suite of in situ methods.

Apr 19, 2024 | ajpmonline.org | Tong Xia |Jian Li |Liwei Chen

Leisure-time physical activity (LTPA) decreases allostatic load (AL), a measure of burden of chronic stress. However, the role of occupational PA (OPA) is unknown. This study examined associations of OPA and LTPA with AL among workers in the United States (US). This cross-sectional study included 6944 US workers aged 20–64 years from the National Health and Nutrition Examination Survey (2007–2018). PA was assessed using the Global Physical Activity Questionnaire.