Hanseok Lee

Abstract Mn oxides are attractive non-noble-metal catalysts for the oxygen evolution reaction in proton exchange membrane water electrolyzers, but their performance is limited by unstable Jahn–Teller-active Mn3+ centers and a narrow potential window. Here, we show that Nd doping stabilizes Jahn–Teller-active Mn3+ centers within a mixed-phase Mn oxide catalyst. The catalyst requires an overpotential of 404 mV to reach 100 mA cm–2 and remains stable for more than 1000 h at 200 mA cm–2.

After a two-year hiatus due to the pandemic, the MTA has announced that it is reviving its annual tradition of Holiday Nostalgia Rides. Every Sunday until Christmas, New Yorkers and tourists can ride antique trains that once carried thousands throughout the city. Since 1976, New York City Transit Museum has run various Nostalgia Rides in collaboration with MTA, bringing its vintage fleet back to life again on the subway tracks.

A small island State with a population of 11,000 in the South Pacific will replicate itself in cyberspace. Simon Kofe, Tuvalu’s Foreign Minister, announced that copies of the country’s landscape will be created in the metaverse at the 27th United Nations Climate Change Conference, or COP27, hosted in Egypt in early November. This plan is an attempt to preserve Tuvalu’s culture and history as rising sea levels threaten its physical territory.