In article number 1906615, Jianjun Tian and co-workers describe a fully automated spray-coating technology with ultrathin-film purification for a commercial large-scale solution-based process for colloidal inorganic perovskite CsPbI₃ quantum dot (QD) films. The QD solar cells based on such films show a high power conversion efficiency of 11.2% and can maintain 80% of initial efficiency in air ambient for one month without any encapsulation.

In article number 1903391, Jianxun Ding and co-workers develop three multiantigenic nanovaccines of different sizes for cancer immunotherapy, which are composed of various imiquimod-loaded poly(lactic-co-glycolic acid) nanoparticles and a cancer cell membrane coating. The smallest nanovaccine shows rapid migration to the draining lymph nodes, achieves efficient antigen presentation to T lymphocytes, and induces antitumor immunity.

In article number 1906174, Jia Li, Lin Gan, Feiyu Kang, and co-workers report the direct growth of carbon nanotubes doped with Fe-N₄ moieties for improved electrocatalytic stability in the cathodic oxygen reduction reaction (ORR) in proton-exchange-membrane fuel cells. By increasing the neighboring graphitic nitrogen, the Fe-N₄ moieties also show enhanced activity due to the modified spin state of the Fe center and thereby optimized binding energy with ORR intermediates.

In article number 1903863, Donghoon Choi, Seung-Woo Cho, and co-workers demonstrate phenolic hyaluronic acid hydrogel patches as a ready-to-use bioinspired adhesive tissue tape for non-invasive stem cell transplantation and therapeutic drug delivery. The tissue tapes are biocompatible, tissue adhesive, and easy to handle, providing a highly effective off-the-shelf therapy for regenerative medicine.