The Cover Feature shows a slim genie (hydrogenase) who oxidizes H2 and releases energy in the manner of a fuel cell, and a fat genie (photosystem II) that oxidizes H2O by absorbing energy, in the manner of a solar cell. In their Communication, M. Kikkawa et al. demonstrate that a single Ir catalyst is capable of mimicking both systems. By using the Ir complex as the H2- or H2O-oxidizing anode catalyst and carbon black-supported platinum as the O2-reducing cathode catalyst, the functionality of the whole cell can be switched between fuel cell-type and solar cell-type. More information can be found in the Communication by M. Kikkawa et al. on page 4024 in Issue 21, 2017 (DOI: 10.1002/cctc.201700995).
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
The development of hydrogen fuel cells is greatly hindered by the unwanted generation of H2 O2 at the cathode. A non-Pt cathode catalyst is now shown to be capable of simultaneously reducing both O2 and H2 O2 , thus rendering H2 O2 a useful part of the feed stream. The applicability of this unique catalyst is demonstrated by employing it in a fuel cell running on H2 /CO and O2 /H2 O2 .
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
Hydrogen gas is a strong contender for the next generation of energy, but it has serious drawbacks in terms of storage and transportation. So chemical derivatives, known as hydrogen energy carriers, are currently being developed. All current carriers have their own weaknesses, however, so here, we present an entirely new direction for their development. Instead of transporting H2-derived H or H–, we transport only its electrons. We describe a fully functioning system with a Ni complex for electron extraction, ethyl viologen for electron storage, and a NiFe complex for regenerating H2. Our system is notable for (1) working wholly at 20–40 °C, (2) not generating any CO2, (3) not using any precious metals, and (4) having a recyclable carrier.
