Abstract
The effects of acetylene black powder surface free energy on air electrode electrochemical performance and lifetime were studied. The acetylene black was immersed in 30% H 2O 2 at room temperature and the changes of functional groups and surface free energy were investigated by X-ray Photoelectron Spectros-copy (XPS) and powder contact angle (CA). The air electrode performance was characterized by the potential polarization curves and the lifetime was measured by constant-current discharge. It shows that, its surface free energy is the lowest when the acetylene black is immersed in H 2O 2 for 240 h. The polarization potential of the air electrode prepared by the pretreated acetylene black is 0.25 V(vs. Hg/HgO), 0.21 V lower than the air electrode with untreated acetylene black when the working current density is 100 mA.cm −1. And its lifetime is over 800 h at 80 mA.cm −1. The pretreatment of acetylene black for proper time by H 2O 2 is favorable for the stability of the tri-phase reaction interface of air electrode and improvement of its performance.
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