It is challenging to exploit anionic redox activity to boost performance of battery electrodes, especially for anti-fluorite structures. Here the authors report simultaneous anionic and cationic redox in Li₅FeO₄, which enables its high capacity and eliminates the undesired oxygen gas release.

CO₂ is often found alongside CH₄ in natural gas wells; therefore, separation of the gases is an important industrial process. Jalilov et al. demonstrate that the adsorption selectivity for CO₂ over CH₄ can be significantly enhanced through introduction of water into the pores of a high-surface-area carbon.

Cation engineering has been used to tune the efficiency and stability of perovskite solar cells. Here, Jodlowski et al. introduce guanidinium, a cation slightly larger than previously thought possible, mixed with the traditional methylammonium cation, into the 3D structure, improving device stability.

Anionic redox provides extra capacity for battery electrodes, but it is challenging to realize its full potential. Tarascon and colleagues report a record-high reversible capacity of 3.5 electrons per Ir in a Li₃IrO₄ phase, and discuss the importance of increasing the ratio of oxygen versus transition metal.

The applications of solution-state NMR of membrane proteins are often limited by difficulty in finding a suitable membrane mimetic of tailored size that shows native-like membrane properties and provides long-term stability. This protocol describes how to assemble phospholipid nanodiscs and incorporate membrane proteins for NMR-structural studies.

DNA bricks with binding domains of 13 nucleotides instead of the typical 8 make it possible to self-assemble gigadalton-scale, three-dimensional nanostructures consisting of tens of thousands of unique components.