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中文题名:

 硫化物复合体的合成及电催化分解水性能研究    

姓名:

 左康    

保密级别:

 公开    

论文语种:

 chi    

学科代码:

 070301    

学科专业:

 化学    

学生类型:

 学士    

学位:

 理学学士    

学位年度:

 2024    

校区:

 北京校区培养    

学院:

 化学学院    

第一导师姓名:

 马淑兰    

第一导师单位:

 化学学院    

提交日期:

 2024-05-28    

答辩日期:

 2024-05-28    

外文题名:

 Synthesis of sulfide complexes and study of electrocatalytic water splitting properties    

中文关键词:

 电解水 ; 氢能 ; 泡沫镍 ; 金属硫化物 ; 钼酸盐 ; 析氢催化剂    

外文关键词:

 Water electrolysis ; Hydrogen energy ; Nickel foam ; Metal sulfides ; Molybdate ; Hydrogen evolution catalysts    

中文摘要:

化石燃料的不断消耗和环境污染问题加剧, 促使人们开发新能源。氢能具有高的能量密度,使用中可实现零排放,为绿色、高效的能源载体。水的电解可获得氢能,而该过程需添加催化剂以降低过电位。开发低成本、高效的非贵金属催化剂意义重大。本文以泡沫镍(NF)为基底并提供镍源,添加钼酸钠和硫代乙酰胺,通过一步水热法在NF原位生长复合体材料,经XRD、XPS、Raman表征推测其组成为NiMoO4/MoS2/Ni3S2/NF。通过调控硫源用量x(x为硫代乙酰胺的摩尔数),所得产物NiMoO4/MoS2/Ni3S2/NF-2在碱性和酸性电解质中均具有优良的析氢(HER)催化性能。碱性条件下,电流密度为10 mA cm-2时所需过电位低至48.8 mV,且稳定性超过164 h;酸性条件下,10 mA cm-2的过电位为72  mV,稳定性达38 h。本论文为开发性能优异的析氢催化剂提供重要参考。

外文摘要:

The continuous consumption of fossil fuels and the intensification of environmental pollution have prompted people to develop new energy sources. Hydrogen energy has a high energy density and can achieve zero polluting emissions in use, making it a green and efficient energy carrier. Hydrogen can be obtained from the electrolysis of water, a process that requires the addition of a catalyst to reduce the overpotential. The development of low-cost, high-efficiency non-precious metal catalysts is of great significance. In this work, nickel foam (NF) was used as the substrate and provided a nickel source, sodium molybdate and thioacetamide were added to grow composite materials in situ on NF substrate by one-step hydrothermal method, and the composition was estimated to be NiMoO4/MoS2/Ni3S2/NF by XRD, XPS and Raman characterizations. By adjusting the amount of sulfur source x (x represents the moles of thioacetamide), the obtained product NiMoO4/MoS2/Ni3S2/NF-2 exhibits excellent hydrogen evolution (HER) catalytic performance in both alkaline and acidic electrolytes. Under alkaline conditions, the overpotential required is as low as 48.8 mV at a current density of 10 mA cm-2 and has a stability of more than 164 h, while under acidic conditions, the overpotential of 10 mA cm-2 is 72 mV and the stability is up to 38 h. This work provides an important guide for the development of hydrogen evolution catalysts with excellent performance.

参考文献总数:

 55    

馆藏号:

 本070301/24064    

开放日期:

 2025-05-29    

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