A series of Co-Ni-Fe hydrotalcite like compounds have been synthesized by combining a mixed solution of Co(NO3)2·6H2O,Ni(NO3)2·6(H2O) and Fe(NO3)3·9H2O with a second solution containing NaOH and Na2CO3....A series of Co-Ni-Fe hydrotalcite like compounds have been synthesized by combining a mixed solution of Co(NO3)2·6H2O,Ni(NO3)2·6(H2O) and Fe(NO3)3·9H2O with a second solution containing NaOH and Na2CO3.The compounds have been characterized by XRD,IR and TG-DTA.The results showed that the hydrotalcites with M2+/M3+ molar ratios of 2 to 4 have the nice crystal form and high purity.After calcined,hydrotalcites are converted into composite oxides.It is found that the composite oxides has activity and selectivity for catalyzing the dehydrogenation and dehydration of ethanol.展开更多
探索低成本高效率的析氧电极对于工业电解水技术的发展至关重要.尽管镍铁水滑石已被公认为是一种高效析氧的非贵金属催化剂,但其本征活性还有待进一步提高.本研究通过将氧空位缺陷引入镍铁水滑石,设计出一种低成本高效率的析氧电极.通...探索低成本高效率的析氧电极对于工业电解水技术的发展至关重要.尽管镍铁水滑石已被公认为是一种高效析氧的非贵金属催化剂,但其本征活性还有待进一步提高.本研究通过将氧空位缺陷引入镍铁水滑石,设计出一种低成本高效率的析氧电极.通过精确电子结构调控,暴露更多活性位点,提高电极导电性,富缺陷镍铁水滑石电极展现出1.40 V(vs.RHE)的低起峰电位.同时,它仅需200 m V过电势就能达到10 m A cm^(-2)的电流密度,这相比未经处理的镍铁水滑石降低了48 m V.我们进一步通过密度泛函理论计算发现,氧空位缺陷的引入使Fe的价态降低,带隙减小,使得催化过程中电子更容易被激发到导带中,从而降低反应过电势并使析氧活性增强.展开更多
文摘A series of Co-Ni-Fe hydrotalcite like compounds have been synthesized by combining a mixed solution of Co(NO3)2·6H2O,Ni(NO3)2·6(H2O) and Fe(NO3)3·9H2O with a second solution containing NaOH and Na2CO3.The compounds have been characterized by XRD,IR and TG-DTA.The results showed that the hydrotalcites with M2+/M3+ molar ratios of 2 to 4 have the nice crystal form and high purity.After calcined,hydrotalcites are converted into composite oxides.It is found that the composite oxides has activity and selectivity for catalyzing the dehydrogenation and dehydration of ethanol.
基金supported by the National Natural Science Foundation of China,National Key Research and Development Project (2016YFC0801302, 2016YFF0204402)the Program for Changjiang Scholars and Innovative Research Team in the University+2 种基金the Fundamental Research Funds for the Central Universitiesthe longterm subsidy mechanism from the Ministry of Financethe Ministry of Education of China
文摘探索低成本高效率的析氧电极对于工业电解水技术的发展至关重要.尽管镍铁水滑石已被公认为是一种高效析氧的非贵金属催化剂,但其本征活性还有待进一步提高.本研究通过将氧空位缺陷引入镍铁水滑石,设计出一种低成本高效率的析氧电极.通过精确电子结构调控,暴露更多活性位点,提高电极导电性,富缺陷镍铁水滑石电极展现出1.40 V(vs.RHE)的低起峰电位.同时,它仅需200 m V过电势就能达到10 m A cm^(-2)的电流密度,这相比未经处理的镍铁水滑石降低了48 m V.我们进一步通过密度泛函理论计算发现,氧空位缺陷的引入使Fe的价态降低,带隙减小,使得催化过程中电子更容易被激发到导带中,从而降低反应过电势并使析氧活性增强.