On page 5553, C. Tapeinos and A. Pandit review the properties of reactive oxygen species (ROS)-sensitive moieties which can respond to oxidative conditions inside cells. ROS-sensitive chemical structures, shown in the background of the image, are currently used in the biomedical field as drug-delivery systems, imaging probes, prochelators, and prodrugs for imaging and treatment of various diseases.
Highly active and stable electrocatalysts for hydrogen generation from neutral-pH water are highly desired, but very difficult to achieve. Herein we report a facile synthetic approach to cobalt nanocrystal assembled hollow nanoparticles (Co-HNP), which serve as an electrocatalyst for hydrogen generation from neutral-pH water. An electrode composed of Co-HNP on a carbon cloth (CC) produces cathodic current densities of 10 and 100 mA cm−2 at overpotentials of −85 mV and −237 mV, respectively. The Co-HNP/CC electrode retains its high activity after 20 h hydrogen generation at a high current density of 150 mA cm−2, indicating the superior activity and stability of Co-HNP as electrocatalyst.
Our neutral friend: Fast electrochemical hydrogen generation from neutral-pH water is possible with an electrode composed of cobalt-nanocrystal-assembled hollow nanoparticles (Co-HNP) on a carbon cloth (CC). The Co-HNP/CC electrode retains its high activity after 20 h hydrogen generation at a high current density of 150 mA cm−2.
