Abstract
In the present study, K 2S and Bi 2S 3 were used as additives in electrolytes and electrodes, respectively. The effects of these additives on the electrochemical properties of nano-sized Fe 2O 3-loaded carbon electrodes were investigated using cyclic voltammetry (CV), galvanostatic cycling performance and scanning electron microscopy (SEM), along with electron dispersive spectroscopy (EDS). The results showed that both K 2S and Bi 2S 3 significantly reduced hydrogen evolution and benefited the Fe 2O 3-loaded carbon electrode, such as by retarding passivation and improving the discharge capacity. The effects of metal sulfide additives depended on the carbon used. For Bi 2S 3 additive, all carbons provided larger capacities than acetylene black (AB) while AB gave greater capacity than other carbons when K 2S was used.
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