Characterization of a copper phosphate triazole metal organic framework material (Cu3PO4(C2N3H2)2OH) and oxygen evolution studies

被引:28
作者
Bagtache, R. [1 ]
Rekhila, G. [2 ]
Abdmeziem, K. [1 ]
Trari, M. [2 ]
机构
[1] USTHB, Fac Chem, Lab Electrochem Corros Met & Inorgan Chem, Algiers 16111, Algeria
[2] USTHB, Fac Chem, Lab Storage & Valorizat Renewable Energies, Algiers 16111, Algeria
关键词
Cu3PO4(C2N3H2)(2)OH; Photocatalytic; Oxygen; Chemical storage; HYDROTHERMAL SYNTHESIS;
D O I
10.1016/j.mssp.2014.02.018
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
The metal organic framework (MOF) Cu3PO4(C2N3H2)(2)OH, synthesized by hydrothermal route, is characterized physically and photoelectrochemically. The compound crystallizes in a monoclinic symmetry with a layered structure. UV-visible spectroscopy shows an optical transition of 2.58 eV. The thermal variation of the electrical conductivity indicates a semiconducting behavior with a conduction mechanism dominated by small polaron hopping: sigma=sigma(0) exp {0.44 eV/kT} and electron mobility (mu(300) (K)=0.3 cm(2) V-1 s(-1)) thermally activated. The interfacial capacitance at pH similar to 7 is characteristic of n type behavior with a flat band potential of +0.40 V-SCE, an electrons density of 2 x 10(15) cm(-3) and a space charge region of 10 pm. The semicircle at high frequencies in the Nyquist plot is not centered on the real axis and the depletion angle (17 degrees) is due to a constant phase element. The impedance data at low frequencies indicate a diffusion-controlled process. As application, the photochemical oxygen evolution is successfully achieved under visible light with a liberation rate of 0.70 cm(3) min(-1) g(-1) and a quantum yield of 0.13%. The reaction (2 SO32-+H2O -> S2O32-+O-2+2OH, Delta G(0) = 90.68 kcal mol(-1)) can be evaluated for the chemical storage. (C) 2014 Elsevier Ltd. All rights reserved.
引用
收藏
页码:144 / 150
页数:7
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