We
used a liquid phase reaction to synthesize a nickel (Ni) and
iron (Fe)-containing layered double hydroxide (NiFe-LDH), having a
lateral size less than 10 nm. A chelating agent introduced into the
media was thought to increase the concentration of metal hydroxide
nuclei and suppress excessive growth of the LDH crystal, resulting
in the synthesis of nanometer-sized LDH. The NiFe-LDH catalyzed the
oxygen evolution reaction (OER) at an overpotential of 247 mV and
current of 10 mA cm–2, which is superior to the
performance of conventional iridium oxide (IrO
x
) catalysts. Notably, a membrane electrode assembly (MEA) for
anion exchange membrane water electrolysis using NiFe-LDH as an anode
catalyst exhibited an energy conversion efficiency of 74.7% for flowing
1.0 A cm–2 in 1 M KOH at 80 °C. This efficiency
is the highest among MEAs implemented with non-noble metal-based catalysts
reported to date and offers a viable replacement for IrO
x
anode catalysts.
Green leaf volatiles are emitted by green plants and induce defence responses. Those with antifungal activities in plants may replace chemicals as natural post-harvest treatments. We investigated the postharvest treatment of strawberry with
trans
-2-hexenal and
cis
-3-hexenal and observed a decrease in the mould infection rate. To determine the volatiles’ functions, we conducted a component analysis of the volatiles released from
trans
-2-hexenal-treated strawberry and analysed gene expression. Several acetates, which were expected to be metabolites of
trans
-2-hexenal in fruit, were released from treated strawberry; however, these acetates did not inhibit fungal growth. The gene expression analysis suggested that postharvest strawberries were not protected by jasmonic acid-mediated signalling but by another stress-related protein. Harvested strawberries experience stress induced by harvest-related injuries and are unable to perform photosynthesis, which might result in different responses than in normal plants.
We report oxygen reduction reaction (ORR) activity in a phenol-substituted iron porphyrin dimer used as catalyst. Supported on carbon, Fe III -porphyrin dimer FeDOH/C shows about 60 mV higher onset potential (OP) and about 50 mV higher half-wave potential (HWP) than those of the unsubstituted monomer (FeM/C). When these two catalysts are com-1006 Oazakadoma,
The cover picture shows our wish to contribute to next‐generation green power. At the top of the picture is an image of a fuel‐cell vehicle, at the middle is a representation of an electrochemical reaction in a polymer electrolyte fuel cell, and at the bottom is the expected oxygen reduction reaction (ORR) mechanism on the phenol‐substituted Fe–porphyrin dimer catalyst. The first step of the ORR occurs on the activated FeN4 center of the phenol‐substituted porphyrin unit, and the subsequent second step occurs on the neighboring FeN4 center of the porphyrin unit. Details are discussed in the Communication by G. Tei, T. Ogawa et al. on page 3229 ff (https://doi.org/10.1002/ejic.201700394). For more on the story behind the cover research, see the Cover Profile (https://doi.org/10.1002/ejic.201700725).
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