Covalent Organic Framework Constructed by Clicking Azido Porphyrin with Perpropargyloxy-Cucurbit[6]uril for Electrocatalytic Hydrogen Generation from Water Splitting

In the present study, we describe synthesis and characterization of a new covalent organic framework (COF-TPP-CB[6]) which was assembled together by clicking perpropargyloxy cucurbit[6]uril (CB[6]) to azido-functionalized tetraphenylporphyrin (TPP-4N3) through copper-catalyzed azide–alkyne cycloaddition reaction (CuAAC). Perpropargyloxy CB[6] synthesized direct oxidation afford perhydroxy followed subsequent O-propargylation using NaH. We also demonstrated that resulting can be employed as an efficient stable electrocatalyst for hydrogen evolution (HER) in alkaline medium upon loading it with nickel cocatalyst. The effect TiO2 different loadings Ni on HER performance TPP-CB[6] studied. Herein, 12%Ni@TPP-CB[6] optimum catalyst showed impressive H2 production rate 18.7 mmol h–1 g–1 low onset potential ?250 mV.