In this issue, J. Noack et al. review the electrochemistry of redox-flow batteries. What are the chemical properties of true and hybrid systems? In a Minireview, J. Z. Zong and B. Zeng discuss the printing of transparent electrodes with nanocrystal inks. The Highlights deal with sterically hindered photochromic switches (J. Y. Yoon and A. P. de Silva) and perovskite solar cells (J. L. Delgado et al.).

In the Communications section, K. Yamamoto et al. demonstrate how to find the most catalytically active platinum clusters with low atomicity (see picture). P. H. Seeberger et al. elucidate the immunological importance of a pyruvate modification in capsular polysaccharides. V. Gouverneur et al. describe fluorine-18 labeling of aryl-SCF₃, -OCF₃, and OCHF₂. C. Mao et al. report on the post-assembly stabilization of rationally designed DNA crystals.

• Angewandte Chemie 34/2015: Powering Chemistry,
  Angew. Chem. Int. Ed. 2015, 54 (34).