Two Co(II)/Ni(II) isostructural Metal-Organic Frameworks with bnn topology for photocatalysis and electrocatalysis

• Published in: Microporous and mesoporous materials 2021-01, Vol.312, p.110813, Article 110813
• Main Authors: Qin, Ling, Hu, Qing, Zou, Ying-Pei, Fu, Wen-Ping, Ye, Tong-Qi, Zhang, Ming-Dao
• Format: Article
• Language: English
• Subjects: 3-Fold interpenetration; bnn topology; Dye adsorption and degradation; Electrocatalysis; Metal-organic framework
• ISSN: 1387-1811; 1873-3093
• DOI: 10.1016/j.micromeso.2020.110813

Two isostructural Co(II) and Ni(II)-based Metal-Organic Frameworks (MOFs), {[Co(bcpt)(bib)3/2(H2O)]·H2O}n (1), {[Ni(bcpt)(bib)3/2(H2O)]·H2O}n (2), have been synthesized and characterized (H2bcpt = 3,5-bis(3-carboxyphenyl)-1,2,4-triazole, bib = 1,4-bis(1-imidazoly)benzene). The mixed ligands linked metal ions to form a three dimensional 5-connected net with a rare bnn topology. Ni-MOF had the better degradation efficiency than Co-MOF. They were carbonized in tube furnace at 800 °C and exhibited better HER activities than glass carbon: Co-MOF-800 with a lower onset potential (−210 mV); Ni-MOF-800 with a smaller Tafel slope (89.87 mV decade−1). We studied the HER activities for the mixture prepared from Co-MOF-800 and Ni-MOF-800, which aims to explore the role of metal ion. Two isostructural Co(II) and Ni(II)-based MOFs have been synthesized. The mixed ligands linked metal ions to form a 3-fold interpenetrational net with a rare bnn topology. Compound 2 had a better adsorption and degradation efficiency. In addition, MOFs 1 and 2 were carbonized in tube furnace at 800 °C, affording the Co-MOF-800 and Ni-MOF-800. Co-MOF-800 has a lower onset potential (−210 mV); Ni-MOF-800 has a smaller Tafel slope (89.87 mV decade−1). In addition, we studied the HER activities for the mixture, which is prepared from Co-MOF-800 and Ni-MOF-800 by grinding. [Display omitted] •Two isostructural Co(II) and Ni(II) MOFs with bnn topology have been synthesized and characterized.•Ni-MOF had a better adsorption and degradation efficiency than Co-MOF.•The Co-MOF-800 and Ni-MOF-800 samples exhibited better HER activities than glass carbon.•Co-MOF-800 has a lower onset potential; Ni-MOF-800 has a smaller Tafel slope.•We studied the HER activities for the mixture from Co-MOF-800 and Ni-MOF-800 by grinding.