Abstract:

A novel design of reference electrode was developed to in-situ measure the polarization of direct methanal fuel cell(DMFC).The effect of humidification conditions of electrolyte on the reference electrode potential and its potential stability was investigated.The experiment results showed that the potential of reversible hydrogen electrode (RHE), acting as the reference electrode of DMFC, decreased with increasing degree of electrolyte humidification.It was found that the potential stability of RHE was mainly determined by the stability of its surface state.To obtain stable and accurate polarization curves, it was suggested that the electrolyte located on RHE should be humidified by liquid water on its opposite side and the flow rate of H₂ should be controlled at an appropriate and stable value.

摘要：

提出了用于原位测量直接甲醇燃料电池(DMFC)极化的参比电极的结构设计，并考察了电解质的润湿程度对参比电极的电位及其电位稳定性的影响.结果表明：在可逆氢电极(RHE)作为参比电极的DMFC中，RHE的电位随电解质润湿程度的增加而降低，其电位的稳定性主要取决于其表面状态的稳定性.提出要获得电位稳定及测量准确的极化曲线，RHE处的电解质应处于对侧液态水润湿的状态，且电极表面要有适量、稳定流速的氢气.