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Effect of surface free energy of acetylene black powder on air electrode performance 被引量:1
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作者 OU Xiuqin LIU Shuguang +3 位作者 LIANG Guangchuan LI Ying zhi xiaoke HAN Bin 《Rare Metals》 SCIE EI CAS CSCD 2006年第z1期364-368,共5页
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_(2)O_(2)at room temperature and the changes of ... 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_(2)O_(2)at room temperature and the changes of functional groups and surface free energy were investigated by X-ray Photoelectron Spectroscopy(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_(2)O_(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_(2)O_(2)is favorable for the stability of the tri-phase reaction interface of air electrode and improvement of its performance. 展开更多
关键词 air electrode acetylene black immerse surface free energy electrochemical performance
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