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Structural Regulation and Electrochemical Performance of Self-Supported Nickel-Based MOF on Ni Foam
Author NameAffiliationE-mail
HU Wen-Ming College of Material Science and Engineering, Hunan University, Changsha 410082, China  
MA Qian College of Material Science and Engineering, Hunan University, Changsha 410082, China  
HE Yong-Qiang College of Material Science and Engineering, Hunan University, Changsha 410082, China  
LIU Hong-Bo College of Material Science and Engineering, Hunan University, Changsha 410082, China  
LIU Jun-Qiang Chenzhou Shanshan Corporation, Chenzhou, Hunan 423000, China  
XIA Xiao-Hong College of Material Science and Engineering, Hunan University, Changsha 410082, China xxh@hnu.edu.cn 
Abstract: We synthesized self-supported Ni-based MOF material on nickel foam (Ni-MOF/NF) with high mass loading vis a one-step hydrothermal method by the use of nickel chloride as a metal salt and terephthalic acid (PTA) as an organic ligand. Solvents had a remarkable effect on the morphology and electrochemical performance of the Ni-MOF/NF because of the different pH values and solubility of PTA. The higher the solubility of the solvent and pH value was, the faster the diproton rate of PTA in the solution and the nucleation rate. As a result, self-supported Ni-based MOF material exhibited different morphologies such as spherical cluster, flake and bulk, resulting in an increasing mass loading of Ni-based MOFs on the Ni foam. When using a ternary mixture (N,N-dimethylformamide, water and ethanol with volume ratio of 1:1:1) solvent, Ni-MOF/NF achieved the highest loading mass of 10 mg·cm-2 and the area capacity of 8 780 mF·cm-2 at a current density of 1 mA·cm-2 in 3 mol·L-1 KOH electrolyte. Even at high current density of 5 mA·cm-2, the area capacity still reached at 5 544 mF·cm-2 and the capacity retention rate was 63%, delivering an excellent rate performance. Furthermore, the area capacity retention rate was 56% after 1 000 cycles.
Keywords: metal-organic framework  solvothermal  solvent effect  electrochemistry
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HU Wen-Ming,MA Qian,HE Yong-Qiang,LIU Hong-Bo,LIU Jun-Qiang,XIA Xiao-Hong.Structural Regulation and Electrochemical Performance of Self-Supported Nickel-Based MOF on Ni Foam[J].Chinese Journal of Inorganic Chemistry,2020,36(3):485-493.
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Chinese Journal of Inorganic Chemistry