钴基磷化物纳米阵列设计及其电催化分解水性能研究
发布时间：2018-09-11 14:01
【摘要】：在同一种电解质中的全电解水产氢和产氧是应对能源短缺和环境污染的一种有效解决途径,但同时也面临着巨大的挑战。在这领域中,设计和获得高性能的析氢反应(HER)和析氧反应(OER)双功能电催化电极材料一直是研究人员的目标。针对在同一电解质中同时用作OER和HER的双功能催化剂,存在着的活性低、稳定性差等问题。本论文的创新点就是结合非贵金属离子的掺杂效应和构筑一维纳米线复合二维纳米片的多级结构纳米阵列,实现低成本和高效稳定的全分解水电催化剂制备。通过简单的两步法,即水热合成和低温磷化处理,在泡沫镍基底上成功地合成了一种过渡金属锰掺杂的具有纳米线复合超薄纳米片多级结构阵列的磷化钴酸性全分解水电催化剂,该材料命名为1D/2D Mn-CoP。在酸性条件下,1D/2D Mn-CoP具有极好的析氢反应催化性能,当析氢电流为-10 mA/cm2时,1D/2D Mn-CoP的过电势为42 mV,相应的塔菲尔斜率是43 m V/decade,是最好的析氢反应电催化剂之一。此外,该材料在酸性条件下具备极好的稳定性。同时1D/2D Mn-CoP在酸性条件下具有极好的催化析氧性能,析氧电流达到100 mA/cm2的过电位是510 mV,优于商业的IrO2。因此,1D/2D Mn-CoP非常适合在同一个电解质里同时用作阴极和阳极材料,进行电催化全分解水产氢和产氧。在0.5 M H2SO4里,1D/2D Mn-CoP进行全分解水时只需要1.58 V的电压,就能达到10 mA/cm2的电流密度,优于商业的Pt/C用作阴极材料和IrO2用作阳极材料的全分解水性能。1D/2D Mn-CoP这些优异的电化学性能归因于过渡金属锰掺杂的掺杂效应和独特的一维纳米线复合二维超薄纳米片的多级结构阵列,这为发展高效和低成本的全分解水电催化剂提供了新的解决思路和机会。
[Abstract]:Full electrolytic hydrogen and oxygen production in the same electrolyte is an effective solution to energy shortage and environmental pollution, but it also faces great challenges. In this field, it has been the goal of researchers to design and obtain high performance hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) dual function electrocatalytic electrode materials. The bifunctional catalysts used in the same electrolyte for both OER and HER have low activity and poor stability. The innovation of this thesis is to combine the doping effect of non-noble metal ions and to construct a multilevel nanowire composite two-dimensional nanoarray to achieve the low cost and high efficient and stable preparation of fully decomposed hydro catalysts. By a simple two-step method, hydrothermal synthesis and low-temperature phosphating, A transition metal manganese doped cobalt phosphide acid full decomposition hydropower catalyst with nanowire composite ultrathin nanochip array was successfully synthesized on a nickel foam substrate. The material was named 1D/2D Mn-CoP. The 1D / 2D Mn-CoP has excellent catalytic performance for hydrogen evolution under acidic conditions. When the hydrogen evolution current is -10 mA/cm2, the overpotential of 1D / 2D Mn-CoP is 42 mV, and the corresponding Taffel slope is 43 MV / decade. it is one of the best electrocatalysts for hydrogen evolution. In addition, the material has excellent stability in acidic conditions. At the same time, 1D/2D Mn-CoP has excellent catalytic oxygen evolution performance under acidic conditions. The overpotential of oxygen evolution current up to 100 mA/cm2 is 510 mV, which is superior to commercial IrO2.. Therefore, 1D / 2D Mn-CoP is very suitable to be used as cathode and anode material in the same electrolyte for the total decomposition of aquatic hydrogen and oxygen. In 0.5m H2SO4, 1D / 2D Mn-CoP can completely decompose water with a voltage of only 1.58V, which can reach a current density of 10 mA/cm2. The excellent electrochemical performance of commercial Pt/C as cathode material and IrO2 as anode material. 1D / 2D Mn-CoP is attributed to the doping effect of transition metal manganese doping and the unique one-dimensional nanowire composite two-dimensional ultrathin nanowire. A multilevel array of meters, This provides a new solution and opportunity for the development of efficient and low-cost fully decomposed hydro-power catalysts.
【学位授予单位】：天津理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：O643.36;TQ116.2
[Abstract]:Full electrolytic hydrogen and oxygen production in the same electrolyte is an effective solution to energy shortage and environmental pollution, but it also faces great challenges. In this field, it has been the goal of researchers to design and obtain high performance hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) dual function electrocatalytic electrode materials. The bifunctional catalysts used in the same electrolyte for both OER and HER have low activity and poor stability. The innovation of this thesis is to combine the doping effect of non-noble metal ions and to construct a multilevel nanowire composite two-dimensional nanoarray to achieve the low cost and high efficient and stable preparation of fully decomposed hydro catalysts. By a simple two-step method, hydrothermal synthesis and low-temperature phosphating, A transition metal manganese doped cobalt phosphide acid full decomposition hydropower catalyst with nanowire composite ultrathin nanochip array was successfully synthesized on a nickel foam substrate. The material was named 1D/2D Mn-CoP. The 1D / 2D Mn-CoP has excellent catalytic performance for hydrogen evolution under acidic conditions. When the hydrogen evolution current is -10 mA/cm2, the overpotential of 1D / 2D Mn-CoP is 42 mV, and the corresponding Taffel slope is 43 MV / decade. it is one of the best electrocatalysts for hydrogen evolution. In addition, the material has excellent stability in acidic conditions. At the same time, 1D/2D Mn-CoP has excellent catalytic oxygen evolution performance under acidic conditions. The overpotential of oxygen evolution current up to 100 mA/cm2 is 510 mV, which is superior to commercial IrO2.. Therefore, 1D / 2D Mn-CoP is very suitable to be used as cathode and anode material in the same electrolyte for the total decomposition of aquatic hydrogen and oxygen. In 0.5m H2SO4, 1D / 2D Mn-CoP can completely decompose water with a voltage of only 1.58V, which can reach a current density of 10 mA/cm2. The excellent electrochemical performance of commercial Pt/C as cathode material and IrO2 as anode material. 1D / 2D Mn-CoP is attributed to the doping effect of transition metal manganese doping and the unique one-dimensional nanowire composite two-dimensional ultrathin nanowire. A multilevel array of meters, This provides a new solution and opportunity for the development of efficient and low-cost fully decomposed hydro-power catalysts.
【学位授予单位】：天津理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：O643.36;TQ116.2
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