Macroporous CoO@Co/N-doped graphitic carbon nanosheet arrays were constructed by engineering a mesoporous CoO nanowire core with a highly conductive Co/NGC shell, and this approach will provide a promising strategy to construct highly effective bifunctional electrocatalysts.

A series of pyridine-type ligands containing C≡C bonds were designed and synthesized for selective oxidative Heck reaction. These ligands were utilized as functional units and integrated into the skeleton of conjugated microporous polymers. 6,6'-diiodo-2,2'-bipyridine and 1,3,5-triethynylbenzene were polycondensed via Sonogashira cross-coupling strategy to afford CMP-1 material. The resultant CMP-1 was used as a heterogeneous catalytic ligand for the Pd-catalyzed oxidative Heck reaction with high linear selectivity. The linear selectivity of CMP-1 is about 30 times higher than that of bipyridine-based monomer ligand. This work opens a new front of using CMP as an intriguing platform for developing highly efficient catalysts in controlling the regioselectivity in organic reactions.

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A new type of phosphorus‐doped porous organic polymer (POP) has been readily synthesized through a Heck reaction, which could be used not only as a support but also a ligand for palladium nanoparticles. The dual‐functional material supported palladium nanocatalyst was used for the efficient and chemoselective hydrogenation of varieties of nitroarenes and α,β‐unsaturated compounds, as well as for the synthesis of indoles from 2‐nitrophenylacetonitrile under 1 atm hydrogen in green solvents at room temperature. No obvious aggregation and loss of catalytic activity of the new nanocatalyst were observed after 10 runs in the reaction.magnified image

Searching for an economical and efficient water splitting electrocatalyst is still a huge challenge for hydrogen production. This work reports one-step synthesis of hierarchical porous prism arrays (HPPAs) composed of Ni–NiO nanoparticles embedding uniformly in graphite carbon (Ni–NiO/C HPPAs), which is derived from metal–organic framework (CPO-27-Ni) prism arrays grown on nickel foam (NF). Remarkable features of the prism arrays, synergistic effect of Ni–NiO/C, porous graphite carbon, high conductive NF, and good contact between catalyst and current collector result in excellent electrocatalytic performance of Ni–NiO/C HPPAs@NF. Ni–NiO/C HPPAs@NF shows a small overpotential of ∼49.48 mV at the current density of 10 mA cm–2, low Tafel slope of 74 mV dec–1 and robust stability for hydrogen evolution reaction (HER) in alkaline media. Especially, the overpotential for HER of Ni–NiO/C HPPAs@NF is only ∼132 mV at the current density of 185 mA cm–2, almost the same as the value from the Pt/C. Furthermore, for oxygen evolution reaction in basic media, Ni–NiO/C HPPAs@NF shows better catalytic activity, lower Tafel slope and higher durability than precious IrO2. The above finding offers an effective strategy to design the bifunctional electrocatalysts for overall water splitting.