Ti-Cu层合电极的电解水析氢性能

Hydrogen precipitation performance of Ti-Cu laminated electrodes for electrolytic water

摘要:

目前通过使用粘接剂将催化剂粘接到基体上成为电解水析氢电极的主流制备方式，但粘接剂本身电阻较大且粘接强度低，易脱落。金属Pt是目前公认的最好的析氢金属电极，但其昂贵的价格限制了工业上大规模的使用。通过爆炸焊接技术将析气过电位低、稳定性好和强度高的钛与导电性优异的铜结合，构筑出一种自支撑钛-铜层合电极。电化学测试表明：相对于单一金属电极，该层合电极在1 mol/L KOH溶液中表现出良好的电解水析氢(HER)性能和导电性且稳定性优异，在电流密度为10 mA·cm-2，测试时间为20000 s的稳定性测试中电位起伏只有0.05 V。电解水析氢量测量实验结果中同样能够验证在实际工作中，钛-铜层合电极具备更优异的析氢性能。利用工作中产生的凹凸不平和富含孔洞的表面形貌暴露出更多的活性位点和电化学活性表面积，使得层合电极的HER性能在长时间工作中不会降低，且会略有提高，为电极材料制备提供有效且能够降低成本的方向，具有广阔的工程应用前景。

Abstract:

Currently, bonding the catalyst to the substrate by using adhesive is the mainstream way to prepare electrodes for hydrogen precipitation in electrolytic water, but the adhesive itself has high resistance and low bonding strength, and is easy to fall off. Metal Pt is currently recognized as the best metal electrode for hydrogen precipitation, but its expensive price limits the industrial use on a large scale. A self-supporting titanium-copper laminate electrode was constructed by combining titanium, which has low overpotential for gas precipitation, good stability and high strength, with copper, which has excellent electrical conductivity, through explosion welding technology. Electrochemical tests have shown that the laminated electrode exhibits good electrolytic hydrogen precipitation (HER) performance and conductivity and excellent stability in 1 mol/L KOH solution with a potential fluctuation of only 0.05 V at a current density of 10 mA-cm-2 and a stability test time of 20,000 s. The uneven and porous surface morphology produced during operation has been used to expose more of the electrodes. The experimental results of hydrogen precipitation measurement of electrolytic water can also verify the superior hydrogen precipitation performance of titanium-copper laminated electrodes in practice. The surface morphology exposed more active sites and electrochemically active surface area, so that the HER performance of the laminated electrode will not decrease and will be slightly improved during long-time operation, which provides an effective and cost-reducing direction for electrode material preparation and has a broad engineering application prospect.