Enhancement of Hydrogen Adsorption on Spray-Synthesized HKUST-1 via Lithium Doping and Defect Creation

We prepared HKUST-1 (Cu(3)BTC(2); BTC(3−) = 1,3,5-benzenetricarboxylate) using a spray synthesis method with Li doping and defect created via partial replacement of H(3)BTC with isophthalic acid (IP) to enhance the H(2) adsorption capacity. Li-doping was performed by incorporating LiNO(3) in HKUST-1 via spray synthesis and subsequent thermal treatment for decomposing NO(3)(−), which enhances H(2) uptake at 77 K and 1 bar per unit mass and per unit area from 2.37 wt% and 4.16 molecules/nm(2) for undoped HKUST-1 to 2.47 wt% and 4.33 molecules/nm(2), respectively. Defect creation via the replacement of the BTC(3−) linker with the IP(2−) linker slightly in HKUST-1 skeleton did not affect H(2) uptake. Both Li-doping and defect creation significantly enhanced H(2) uptake to 3.03 wt%, which was caused by the coordination of Li ions with free carboxylic groups of the created defects via IP replacement.