Closely packed CoS2/MoS2 nanoarray synthesized from MOF for overall water splitting

Water splitting enables efficient conversion of renewable energy storage with great potential for performance improvement. Therefore, the development of economic and high-performance electrocatalysts is crucial. This work proposed a strategy that the tightly packed CoS2/MoS2 heterostructure was synthesized on carbon paper as a bimetallic electrocatalyst for water splitting applications. Electrochemical test results present that CoS2@MoS2/CP has excellent catalytic activity and hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) overpotentials of 135 mV and 348 mV were achieved in 1 M KOH. Two-electrode water splitting device anode and cathode were fabricated using CoS2@MoS2/CP. When the current density is 10 mA.cm-2, the cell voltage is only 1.51 V. The 10-h long-term durability test exhibited that its stability is better than most reported non-precious metal electrocatalysts. This work provides a new research route for preparing efficient and stable electrocatalysts for better applications in water splitting.