Electrocatalytic Oxygen Reduction In article number 2207991, Cheng-Yan Xu and co-workers develop a self-sacrificing strategy to encapsulate single-atom Fe-N4O1 species into carbon hollow spheres assembled by ultrathin nanosheets Fe1–N–C microspheres (Fe1/N-HCMs). Such highly open architecture is supposed be an ideal platform isolate fully expose single metal atoms. Benifiting from the abundant ...

The targets used in inertial confinement fusion (ICF) experiments at the Lawrence Livermore National Laboratory are plastic capsules roughly 0.5 mm in diameter. The capsules, which typically have wall thicknesses from 20 to 60 p, must possess extraordinary symmetry and concentricity and must have surface finishes of less than 1000 A peak-to-valley variation over surface contours of from 10 to 1...