钼基氧化物是典型的过渡金属氧化物,具有特殊的能带结构,是一种极具潜力的非贵金属电解水析氢催化材料。本研究利用溶液燃烧合成技术,以四水钼酸铵为钼源,葡萄糖为碳源,合成了无定形结构的MoO_(x)/C复合材料,研究了葡萄糖添加量对产物...钼基氧化物是典型的过渡金属氧化物,具有特殊的能带结构,是一种极具潜力的非贵金属电解水析氢催化材料。本研究利用溶液燃烧合成技术,以四水钼酸铵为钼源,葡萄糖为碳源,合成了无定形结构的MoO_(x)/C复合材料,研究了葡萄糖添加量对产物相态和显微结构的影响,评价了MoO_(x)/C的电催化析氢性能。研究表明,随葡萄糖添加量的增加,MoO_(x)的相态与形貌从粗大颗粒→细小颗粒和部分无定形态→完全无定形结构进行演变。当葡萄糖与钼源的摩尔比值为2.5时,可合成无定形结构的MoO_(x)/C复合材料,将其作为析氢催化剂,在0.5 mol/L H 2 SO 4条件下的起始电位为132 mV,过电位(η10)为212 mV,塔菲尔斜率为84.9 mV/dec,具有良好的析氢催化性能和优异的循环使用稳定性,这归因于无定形结构提供了丰富的催化活性位点以及碳的引入提高了导电性和结构稳定性。展开更多
A high capacitance RuO_(2)-ZrO_(2) coating was prepared by thermal decomposition method.Extended X-ray absorption fine structure(EXAFS),X-ray diffraction(XRD),high-resolution transmission electron microscope(HRTEM)and...A high capacitance RuO_(2)-ZrO_(2) coating was prepared by thermal decomposition method.Extended X-ray absorption fine structure(EXAFS),X-ray diffraction(XRD),high-resolution transmission electron microscope(HRTEM)and ab initio calculations were applied to understand the role of the microstructure in the acquisition of high specific capacitance of RuO_(2)-based oxides.The results show that the RuO_(2)-ZrO_(2) oxide prepared at critical crystallization temperature can be considered to be quasi-amorphous or microcrystalline(A short-range ordered crystal structure can be seen from the TEM image,but no diffraction peaks can be seen from the XRD diffraction patterns).And this RuO_(2)-ZrO_(2) was identified as a solid solution with high solid solubility.It referred to herein as a quasi-amorphous solid solution.Such a special microstructure was conducive for"synergistic catalysis"owing to the cationic interaction and thus could gain high"active site density"and high"active surface",thus developing high specific capacitance.展开更多
文摘钼基氧化物是典型的过渡金属氧化物,具有特殊的能带结构,是一种极具潜力的非贵金属电解水析氢催化材料。本研究利用溶液燃烧合成技术,以四水钼酸铵为钼源,葡萄糖为碳源,合成了无定形结构的MoO_(x)/C复合材料,研究了葡萄糖添加量对产物相态和显微结构的影响,评价了MoO_(x)/C的电催化析氢性能。研究表明,随葡萄糖添加量的增加,MoO_(x)的相态与形貌从粗大颗粒→细小颗粒和部分无定形态→完全无定形结构进行演变。当葡萄糖与钼源的摩尔比值为2.5时,可合成无定形结构的MoO_(x)/C复合材料,将其作为析氢催化剂,在0.5 mol/L H 2 SO 4条件下的起始电位为132 mV,过电位(η10)为212 mV,塔菲尔斜率为84.9 mV/dec,具有良好的析氢催化性能和优异的循环使用稳定性,这归因于无定形结构提供了丰富的催化活性位点以及碳的引入提高了导电性和结构稳定性。
基金Supported by the National Natural Science Foundation Program of China(51604239)Program for New Century Excellent Talents in Fujian Province University(NCETFJ)Program for Innovative Research Team in Science and Technology in Fujian Province University(IRTSTFJ)。
文摘A high capacitance RuO_(2)-ZrO_(2) coating was prepared by thermal decomposition method.Extended X-ray absorption fine structure(EXAFS),X-ray diffraction(XRD),high-resolution transmission electron microscope(HRTEM)and ab initio calculations were applied to understand the role of the microstructure in the acquisition of high specific capacitance of RuO_(2)-based oxides.The results show that the RuO_(2)-ZrO_(2) oxide prepared at critical crystallization temperature can be considered to be quasi-amorphous or microcrystalline(A short-range ordered crystal structure can be seen from the TEM image,but no diffraction peaks can be seen from the XRD diffraction patterns).And this RuO_(2)-ZrO_(2) was identified as a solid solution with high solid solubility.It referred to herein as a quasi-amorphous solid solution.Such a special microstructure was conducive for"synergistic catalysis"owing to the cationic interaction and thus could gain high"active site density"and high"active surface",thus developing high specific capacitance.
