Colin Ophus

Nov 25, 2024 | nature.com | Heng Niu |Tianping Ma |Colin Ophus |Bingfeng Miao |Liang Sun |Yizheng Wu | +4 more

AbstractThe Dzyaloshinskii-Moriya antisymmetric exchange interaction (DMI) stabilises topological spin textures with promising future spintronics applications. According to crystal symmetry, the DMI can be categorized as four different types that favour different chiral textures. Unlike the other three extensively-investigated types, out-of-plane DMI, as the last type that favours in-plane chirality, remained missing so far.

Oct 2, 2024 | nature.com | Xin Geng |Miquel Vega-Paredes |Zhenyu Wang |Colin Ophus |Yan Ma |Siyuan Zhang | +2 more

AbstractGrain boundaries in noble metal catalysts have been identified as critical sites for enhancing catalytic activity in electrochemical reactions such as the oxygen reduction reaction. However, conventional methods to modify grain boundary density often alter particle size, shape, and morphology, obscuring the specific role of grain boundaries in catalytic performance.

Oct 2, 2024 | nature.com | Xin Geng |Miquel Vega-Paredes |Zhenyu Wang |Colin Ophus |Yan Ma |Siyuan Zhang | +2 more

AbstractGrain boundaries in noble metal catalysts have been identified as critical sites for enhancing catalytic activity in electrochemical reactions such as the oxygen reduction reaction. However, conventional methods to modify grain boundary density often alter particle size, shape, and morphology, obscuring the specific role of grain boundaries in catalytic performance.

Sep 13, 2024 | nature.com | Ricardo C. Guerrero-Ferreira |Georgios Varnavides |Max Leo Leidl |Kelvin Lau |Alexander G. Myasnikov |Carsten Sachse | +2 more

AbstractCryo-transmission electron microscopy (cryo-EM) of frozen hydrated specimens is an efficient method for the structural analysis of purified biological molecules. However, cryo-EM and cryo-electron tomography are limited by the low signal-to-noise ratio (SNR) of recorded images, making detection of smaller particles challenging.

Jul 7, 2024 | nature.com | Yao Yang |Jihan Zhou |Zipeng Zhao |Geng Sun |Saman Moniri |Colin Ophus | +9 more

AbstractHeterogeneous nanocatalysts play a crucial role in both the chemical and energy industries. Despite substantial advancements in theoretical, computational and experimental studies, identifying their active sites remains a major challenge. Here we utilize atomic electron tomography to determine the three-dimensional atomic structure of PtNi and Mo-doped PtNi nanocatalysts for the electrochemical oxygen reduction reaction.