【摘要】：在同一種電解質中的全電解水產(chǎn)氫和產(chǎn)氧是應對能源短缺和環(huán)境污染的一種有效解決途徑,但同時也面臨著巨大的挑戰(zhàn)。在這領域中,設計和獲得高性能的析氫反應(HER)和析氧反應(OER)雙功能電催化電極材料一直是研究人員的目標。針對在同一電解質中同時用作OER和HER的雙功能催化劑,存在著的活性低、穩(wěn)定性差等問題。本論文的創(chuàng)新點就是結合非貴金屬離子的摻雜效應和構筑一維納米線復合二維納米片的多級結構納米陣列,實現(xiàn)低成本和高效穩(wěn)定的全分解水電催化劑制備。通過簡單的兩步法,即水熱合成和低溫磷化處理,在泡沫鎳基底上成功地合成了一種過渡金屬錳摻雜的具有納米線復合超薄納米片多級結構陣列的磷化鈷酸性全分解水電催化劑,該材料命名為1D/2D Mn-CoP。在酸性條件下,1D/2D Mn-CoP具有極好的析氫反應催化性能,當析氫電流為-10 mA/cm2時,1D/2D Mn-CoP的過電勢為42 mV,相應的塔菲爾斜率是43 m V/decade,是最好的析氫反應電催化劑之一。此外,該材料在酸性條件下具備極好的穩(wěn)定性。同時1D/2D Mn-CoP在酸性條件下具有極好的催化析氧性能,析氧電流達到100 mA/cm2的過電位是510 mV,優(yōu)于商業(yè)的IrO2。因此,1D/2D Mn-CoP非常適合在同一個電解質里同時用作陰極和陽極材料,進行電催化全分解水產(chǎn)氫和產(chǎn)氧。在0.5 M H2SO4里,1D/2D Mn-CoP進行全分解水時只需要1.58 V的電壓,就能達到10 mA/cm2的電流密度,優(yōu)于商業(yè)的Pt/C用作陰極材料和IrO2用作陽極材料的全分解水性能。1D/2D Mn-CoP這些優(yōu)異的電化學性能歸因于過渡金屬錳摻雜的摻雜效應和獨特的一維納米線復合二維超薄納米片的多級結構陣列,這為發(fā)展高效和低成本的全分解水電催化劑提供了新的解決思路和機會。
[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.
【學位授予單位】：天津理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：O643.36;TQ116.2

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