Here, a facile and novel strategy for the preparation of Cu-doped RuO hollow porous polyhedra composed of ultrasmall nanocrystals through one-step annealing of a Ru-exchanged Cu-BTC derivative is reported. Owing to the optimized surface configuration and altered electronic structure, the prepared catalyst displays a remarkable oxygen evolution reaction (OER) performance with low overpotential of 188 mV at 10 mA cm in acidic electrolyte, an ultralow Tafel slope of 43.96 mV dec , and excellent stability in durability testing for 10 000 cycles, and continuous testing of 8 h at a current density of 10 mA cm . Density functional theory calculations reveal that the highly unsaturated Ru sites on the high-index facets can be oxidized gradually and reduce the energy barrier of rate-determining steps. On the other hand, the Cu dopants can alter the electronic structures so as to further improve the intrinsic OER activity.

The first metal iodate fluoride, Bi(IO )F , with a strong second harmonic generation (SHG) effect has been prepared. Bi(IO )F crystallizes in the polar space group C2 and features a three-dimensional [BiF ] cationic framework with IO groups capping the inner walls of the one-dimensional tunnels. This [BiF ] cationic framework acts as a template for the assembly of the polar IO units in a favorable superposed fashion, which leads to the polar structure of the material. Bi(IO )F displays a rather wide transmittance window (0.3-11 μm) and exhibits a very strong SHG response that is about 11.5 times larger than that of KH PO (KDP) under 1064 nm laser radiation and the same as that of KTiOPO (KTP) under 2.05 μm laser radiation. Preliminary investigations indicate that Bi(IO )F is a promising nonlinear optical material in the visible and mid-IR region.

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Introduction of recently reported single-atom catalysts and their application in the field of clean energy conversion.