PEM水电解用多层钛网析氧阳极制备及性能研究

Synthesis and performance of multilayered titanium mesh oxygen evolution anode in polymer exchange membrane water electrolysis

以钛网为扩散层基体,氯铱酸为前驱体,采用浸渍-热解法制备了IrO_2/Ti析氧阳极,进一步采用热压法制备膜电极.综合扫描电镜、循环伏安、交流阻抗、单池性能曲线测试及阳极寿命强化测试,研究了不同层数钛网析氧阳极对性能及寿命的影响.结果表明:与单层钛网析氧阳极比较,采用双层钛网析氧阳极,积分电荷由84.27 m C/cm2增至153.12 m C/cm2,电极电化学反应阻抗由7.38Ω·cm2降低至3.03Ω·cm2,单池性能得到提升.寿命强化测试表明,采用双层钛网析氧阳极在稳定性及寿命方面有显著提升,稳定运行时间由30 h增加到了53 h.

Using titanium mesh as the diffusion layer substrate, chloroiridic acid as the precursor, oxygen evolution anode of IrO2/Ti was prepared by the thermal decomposition method, and then the membrane electrode assembly was prepared via the hot-press method. The effects of performance and life caused by different layer of titanium mesh oxygen evolution anode was investigated by scanning electron microscopy, cyclic voltammogram, alternating current impedance, cell performance curve test and anode accelerated life test. The results show that the integral charge increased from 84.27 mC/cm2 to 153.12 mC/cm2 and the electrochemical reaction impedance was decreased from 7.38 ohm·cm2 to 3.03 ohm·cm2 both in the single layer Ti mesh and double layer Ti mesh with the improved cell performance. Accelerated life tests show that it has a significant boost in stability and life from single to double layer. The life of the titanium mesh oxygen evolution anode increased from 30 h to 53 h.