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Cycle Stability of the Effective Thermal Conductivity of Nickel‐Activated Magnesium Hydride Powder under Operating Conditions
Energy Technology ( IF 3.6 ) Pub Date : 2020-07-02 , DOI: 10.1002/ente.202000356 Rene Albert 1 , Christian Wagner 1 , Robert Urbanczyk 2 , Michael Felderhoff 1
Energy Technology ( IF 3.6 ) Pub Date : 2020-07-02 , DOI: 10.1002/ente.202000356 Rene Albert 1 , Christian Wagner 1 , Robert Urbanczyk 2 , Michael Felderhoff 1
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Herein, the transient plane source (TPS) method is used to investigate the effective thermal conductivity (ETC) of nickel‐activated magnesium hydride powder (MgH2 with 4 mass% Ni) under operating conditions at temperatures up to 400 °C and a hydrogen pressure up to 25 bar. MgH2 together with Ni can be used as heat storage material and is synthesized by mixing of the respective metal powders with subsequent temperature‐controlled hydrogenation and dehydrogenation cycles under hydrogen gas pressure. Running a hydrogenation and dehydrogenation cycle test of nickel‐activated magnesium hydride for more than 450 cycles shows a tremendous enhancement of the ETC. It can be shown that the ETC value of the MgH2 powder under hydrogen atmosphere depends on the sample temperature, the applied gas pressure, and the cycle number. The maximum ETC of dehydrogenated nickel‐activated magnesium hydrides is above 8 W m−1 K−1 at 15 bar, 400 °C, and after 201 cycles. An investigation by electron microscopy shows a percolated network of dehydrogenated magnesium hydride particles which is formed by sintering during the dehydrogenation steps and which is responsible for the enhanced thermal conductivity.
中文翻译：
镍活化氢化镁粉有效导热系数在工作条件下的循环稳定性
本文中，采用瞬态平面源（TPS）方法研究了镍活化的氢化镁粉末（含4质量％Ni的MgH 2）在高达400°C的温度和氢的条件下的有效导热率（ETC）压力高达25 bar。MgH 2与Ni可以用作储热材料，是通过将各个金属粉末与随后在氢气压力下进行温度控制的加氢和脱氢循环混合而合成的。对镍活化的氢化镁进行的加氢和脱氢循环测试进行了超过450个循环，显示出ETC的显着提高。可以看出MgH 2的ETC值氢气气氛下的粉末取决于样品温度，施加的气体压力和循环次数。脱镍镍活化氢化镁的最大ETC在15 bar，400°C和201个循环后高于8 W m -1 K -1。电子显微镜研究表明，脱氢氢化镁颗粒的渗滤网络是在脱氢步骤中通过烧结形成的，并负责提高导热性。
更新日期：2020-07-02
中文翻译：
镍活化氢化镁粉有效导热系数在工作条件下的循环稳定性
本文中，采用瞬态平面源（TPS）方法研究了镍活化的氢化镁粉末（含4质量％Ni的MgH 2）在高达400°C的温度和氢的条件下的有效导热率（ETC）压力高达25 bar。MgH 2与Ni可以用作储热材料，是通过将各个金属粉末与随后在氢气压力下进行温度控制的加氢和脱氢循环混合而合成的。对镍活化的氢化镁进行的加氢和脱氢循环测试进行了超过450个循环，显示出ETC的显着提高。可以看出MgH 2的ETC值氢气气氛下的粉末取决于样品温度，施加的气体压力和循环次数。脱镍镍活化氢化镁的最大ETC在15 bar，400°C和201个循环后高于8 W m -1 K -1。电子显微镜研究表明，脱氢氢化镁颗粒的渗滤网络是在脱氢步骤中通过烧结形成的，并负责提高导热性。
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