SCFN在低温常压电化学合成氨中的阴极催化性能研究
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摘要
本论文利用柠檬酸盐溶胶-凝胶法合成了一系列Ce_(0.8)Sm_(0.2)O_(2-δ)(SDC)、SmCo_(0.8)Fe_(0.2-x) Ni_xO_3(x=0, 0.1, 0.2)复合氧化物电极材料的前驱体,在高温下烧结成致密的陶瓷。用X射线衍射分析(XRD)分析对各种合成的氧化物进行了物相鉴定,扫描电镜(SEM)对高温烧结陶瓷样片表面的显微结构进行扫描分析、用透射电镜(TEM)对焙烧粉体形貌进行表征。
     以Nafion膜为质子交换膜,Ni-SDC陶瓷为阳极、SmCo_(0.8)Fe_(0.2-x)Nix O3(x=0, 0.1, 0.2)系列陶瓷为阴极组成单电池,研究阴极材料施加电压,反应温度等因素对合成氨速率的影响,系统分析了在测试过程中存在的问题及影响因素,并确定最佳合成氨条件。
     以Nafion膜为质子交换膜,SmCo_(0.8)Fe_(0.2-x)Ni_xO_3(x=0, 0.1, 0.2)与SmCoO_3(SCO)系列粉体为阴极,Ni-SDC粉体为阳极、构成以碳纤维纸为支撑的粉体膜电极,研究了粉体膜电极合成氨的最佳温度和最佳电压,探讨了SmCo_(0.8)Fe_(0.1)Ni_(0.1)O_3粉体膜电极在最佳电压条件下氨合成速率的持续性,比较了相同的组成的陶瓷片单电池与粉体膜电极在室温条件下的氨合成速率。
In this thesis, the precursors of Ce_(0.8)Sm_(0.2)O_(2-δ)(SDC) and SmCo_(0.8)Fe_(0.2-x)Ni_x O_3(x=0, 0.1, 0.2) (SCFN) were synthesized by the sol-gel method and sintered at 1150℃. The multiple Oxides were characterized by transmission electron microscopy (TEM), scanning electron microscopy (SEM) and X-ray diffraction (XRD) respectively.
     The optimum voltage and temperature were determined by single cell which composed of Nafion membrane, Ni-SDC anode ceramic, SmCo_(0.8)Fe_(0.2-x)Ni_x O_3 (x = 0, 0.1, 0.2) (SCFN) cathode ceramic. The optimum voltage is 2.00 V and optimum temperature is 80℃. The optimum voltage and temperature were determined by single cell which composed of Nafion membrane, Ni-SDC anode powder supported with carbon paper,
     SmCo_(0.8)Fe_(0.2-x)Ni_xO_3 (x = 0, 0.1, 0.2) (SCFN) and SmCoO_3(SCO) cathode powder supported with carbon paper. The persistence of ammonia synthesis rate was discussed, using SmCo_(0.8)Fe_(0.1)Ni_(0.1)O_3 as power membrane electrode under the optimum voltage. The rate of ammonia synthesis using power membrane electrode and ceramic electrode of SmCo0.8Fe0.1Ni0.1O3 were compared at room temperature conditions.
引文
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