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HER performances: a) LSV curves at 5 mV s−1; b) Tafel plots of Co2(OH)2CO3, TiO2@Co2(OH)2CO3, Co9S8, and TiO2@Co9S8 electrodes; and c) electrochemical stability of the Co9S8 and TiO2@Co9S8 electrodes at different current densities and times.
