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submitted on 11.10.2020 and posted on 12.10.2020by Jieying Hu, Xiangling Deng, Hu Zhang, Yingxue Diao, Shengxian Cheng, Sai-Li Zheng, Wei-Ming Liao, Jun He, Zhengtao Xu
The cruciform linker
molecule here features two designer functions: the pyrazole donors for
framework construction, and the vicinal alkynyl units for benzannulation to form
nanographene units into the Ni8-pyrazolate scaffold. Unlike the full
12 connections of the Ni8(OH)4(H2O)2
networks, significant linker deficiency was observed here,leaving
about half of the Ni(II) sites capped by acetate ligands, which can be
potentially removed to open the metal sites for reactivity. Thecrystalline Ni8-pyrazolate scaffold also retains
the crystalline order even after thermal treatments (up to 300 °C) that served
to partially graphitizes the neighboring alkyne units. The resultant
nanographene components enhance the electroactive properties of the porous
hosts, achievinghydrogen evolution reaction (HER) activity that
rivals topical nickel/palladium-enabled materials.