| Sumario: | One of the current necessities to produce clean energy is the logical design of inexpensive noble-metal free electrocatalysts with developed structure and composition for electrochemical water splitting. In this study, we introduce a new core-shell-structured bifunctional electrocatalyst of NU-1000/CuCoS for oxygen evolution reaction (OER), hydrogen evolution reaction (HER) and overall water splitting for the first time. Own to unique structure with rich porosity, high electrical conductivity, high stability and larger density of active sites, this nanocomposite can produce water electrolysis in a 1 M KOH solution. The electrochemical measurements show overpotentials of 335 mV for OER and 93 mV for HER at a current density of 10 mAcm. Also, the NU-1000/CuCoS nanocomposite exhibits Tafel slope values of 110 mV dec and 103 mV dec for HER and OER, respectively. Besides, NU-1000/CuCoS presents a significant long-term stability in a 72 h run. Additionally, NU-1000/CuCoS requires 1.55 V to deliver 10 mA cm current density in overall water splitting. According to these results, we hope to use this electrocatalyst in producing oxygen and hydrogen from water.
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