H2 gas sensing of Co-incorporated metal-organic frameworks

Two Co-MOF-74 (Co-MOF-I and Co-MOF–II) were designed for the sensing of H2 gas. Owing to the high density of Co ions (+2 and + 3 states) located in metal clusters in the p-type phase, Co-MOF-74 exhibited better selectivity in gaseous H2 sensing, compared with those of Ni-MOF-74 and Mg-MOF-74. The Co-MOF-II sensor, with higher porosity and Co ion concentration than the Co-MOF-I sensor, had more adsorption sites; consequently, more target gas...