金属纤维多孔电极材料电解水产氢性能研究

Metal fiber porous material forelectrocatalytic hydrogen evolution

  • 摘要: 本文研究了钛合金(TC4)纤维多孔材料(FTC4)和不锈钢纤维多孔材料(F316LSS)电极在硫酸、氢氧化钾两种环境中的电解水产氢性能, 使用扫描电镜和X射线衍射仪分析其形貌和物相的变化规律。结果表明: FTC4的电阻率为2.7 mΩ·cm, 在硫酸电解质稳定性测试后其表面转变β区会部分溶解, 并伴随有氧化钛的生成、传荷受阻、析氢性能下降。而在氢氧化钾中, FTC4具有良好的析氢性能和稳定性, 过电势为538 mV, tafel数值为264 mV·dec-1, 双层电容值为6.96 mF·cm-2, 在长时间测试后物相未发生改变, 形貌仍保持原有的台阶状切削痕迹。F316LSS的电阻率仅为1.1 mΩ·cm, 其在硫酸及氢氧化钾中的析氢性能均优于FTC4, 且在硫酸中析氢活性更好, 过电势为309 mV, tafel数值为134 mV·dec-1, 双层电容值为10.17 mF·cm-2。F316LSS有良好的电解水产氢稳定性, 有利于大规模应用。

     

    Abstract: The electrocatalytic hydrogen production performance of the titanium alloy (TC4) metal fiber porous material (FTC4) and the stainless steel metal fiber porous material (F316LSS) in sulfuric acid and potassium hydroxide were studied. The morphology and phase transition were analyzed by scanning electron microscope and X - ray diffractometer. The results show that the resistivity of FTC4 is 2.7 mΩ·cm. After the stability test in sulfuric acid electrolyte, the β-zone on the surface will be partially dissolved, accompanied by the generation of titanium oxide, which reduced FTC4's hydrogen evolution activity. In potassium hydroxide, FTC4 show a better hydrogen evolution activity and stability. The overpotential is 538 mV, the tafel value is 264 mV·dec-1 and the double-layer capacitance is 6.96 mF·cm-2. After long-term testing, the phase remains unchanged, FTC4's step-like cutting marks still exist. The resistivity of F316LSS is only 1.1 mΩ·cm. Its hydrogen evolution performance in sulfuric acid and potassium hydroxide is better than FTC4. Its hydrogen evolution performance in sulfuric acid is much better, it presents 309 mV for overpotential, 134 mV ·dec-1 for tafel value and 10.17 mF·cm-2 for the double-layer capacitance. F316LSS show a good stability for electrocatalytic hydrogen evolution, which is beneficial to large scale application.

     

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