Lin Kuen-Song, Adhikari Abhijit Krishna, Chang Kai-Che, Chiang Chao-Lung, Wang Chieh-Hung
J Nanosci Nanotechnol. 2014 Apr;14(4):2700-8. doi: 10.1166/jnn.2014.8605.
Two bi-organic type metal organic frameworks (MOFs) such as Co2(BDC)2dabco and Zn2(BDC)2 dabco have been synthesized by hydrothermal method and characterized along with hydrogen adsorption. The hydrogen adsorption capacity of these MOFs was increased after doping by palladium-activated carbon. Co2(BDC)2dabco has cracked and folded thin film like surface while Zn2(BDC)2dabco has a brick-typed cubic structure with particle size about 10-15 microm identified by FE-SEM. The XRD patterns represents that both MOFs have the well crystalline structure. Nitrogen adsorption isotherms show that both structures have Type I adsorption isotherm with the BET specific surface area of 1,390 and 1,433 m2 g(-1) for Co2(BDC)2dabco and Zn2(BDC)2dabco, respectively. Pristine Co2(BDC)2dabco and Zn2(BDC)2dabco can store about 0.22 and 0.25 wt.% of H2 measured at 298 K and 32 bar. This capacity was greatly enhanced by doping palladium-activated carbon to 0.31 and 0.41 wt.%, respectively. Moreover, both structures were also characterized by XANES/EXAFS. EXAFS spectra indicate that Co2(BDC)2dabco has the Co--O bond distance of 2.030 A with the coordination number of 4.2 while Zn2(BDC)2dabco has 2.015 angstroms bond distance of Zn--O with the coordination number of 3.4.
通过水热法合成了两种双有机型金属有机框架材料（MOF），即Co2(BDC)2dabco和Zn2(BDC)2dabco，并对其进行了表征以及氢气吸附测试。钯活性炭掺杂后，这些MOF的氢气吸附容量有所增加。通过场发射扫描电子显微镜（FE-SEM）鉴定，Co2(BDC)2dabco具有破裂且折叠的薄膜状表面，而Zn2(BDC)2dabco具有砖型立方结构，粒径约为10 - 15微米。X射线衍射（XRD）图谱表明两种MOF均具有良好的晶体结构。氮气吸附等温线显示，两种结构均为I型吸附等温线，Co2(BDC)2dabco和Zn2(BDC)2dabco的BET比表面积分别为1390和1433 m2 g(-1)。在298 K和32 bar条件下测量，原始的Co2(BDC)2dabco和Zn2(BDC)2dabco分别可存储约0.22和0.25 wt.%的H2。通过掺杂钯活性炭，该容量分别大幅提高到0.31和0.4 wt.%。此外，两种结构还通过X射线吸收近边结构（XANES）/扩展X射线吸收精细结构（EXAFS）进行了表征。EXAFS光谱表明，Co2(BDC)2dabco的Co - O键距为2.030 Å，配位数为4.2，而Zn2(BDC)2dabco的Zn - O键距为2.015 Å，配位数为3.4。
