A Novel C Doped MoS₂ /CoP/MoO₂ Ternary Heterostructure Nanoflower for Hydrogen Evolution Reaction at Wide pH Range...

The development of low-cost and high-efficiency bifunctional catalysts is still a challenge for hydrogen production through overall water splitting. This paper reports the in-situ synthesis of C-doped MoS₂ /CoP/MoO₂ using bacterial cellulose (BC) as the reducing agent and the source of C and using BC (MoS₂ /Co_1.2 MoO_4.2  ⋅ 1.2H₂ O/BC) as the template. Heterogeneous structure for hydrogen evolution reaction (HER) and alkaline water electrolysis in a wide pH range. Due to the large number of defect sites caused by C doping and the synergy between these three active components (MoS₂ , CoP and MoO₂ ), the HER and oxygen evolution reaction (OER) activities of the catalyst have been greatly improved. Therefore, during HER, a small initial overpotential (27 mV) was achieved in 1.0 M KOH. In 0.5 M H₂ SO₄ , 0.1 M PBS and 1.0 M KOH, the current density reached 10 mA cm^-2 at overpotentials of 123.4, 150, and 139 mV, respectively. For OER, an overpotential of 268 mV was required to achieve 10 mA cm^-2 . The alkaline two-electrode device composed of C doped MoS₂ /CoP/MoO₂ delivers 10 mA cm^-2 at a low potential of 1.51 V and can be easily driven by a single AA battery. This work provides a new design strategy of C doped ternary heterostructures for electrocatalysis and related energy applications.