Key Words:Manganese compounds;Cadmium sulfide - Catalysts - Hydrogen production - II-VI semiconductors - Image enhancement - Nickel compounds - Photocatalytic activity - Precious metals - Sulfur compounds - Water pollution
Abstract:Non-noble metal catalysts for photo/electrocatalytic water splitting are quite feasible for solving the problems of growing energy demand and environmental pollution. In this paper, noble-metal free Mn-Cd-S@amorphous-Ni<inf>3</inf>S<inf>2</inf> hybrid catalyst (MCS@a-Ni<inf>3</inf>S<inf>2</inf>) with bifunctionality of photocatalytic hydrogen evolution and electrocatalytic OER is designed and prepared by simple hydrothermal method. The characterization results show that Mn-Cd-S was composed of cubic manganese sulfide and manganese doped cadmium sulfide, and amorphous Ni<inf>3</inf>S<inf>2</inf> coating on the surface of Mn-Cd-S. The resultant Mn-Cd-S@amorphpus-Ni<inf>3</inf>S<inf>2</inf> catalyst presents good stability and a high photocatalytic H<inf>2</inf> evolution rate of 12,069.27 μmolh<sup>−1</sup> g<sup>−1</sup>. Besides, both Mn-Cd-S and Mn-Cd-S@amorphpus-Ni<inf>3</inf>S<inf>2</inf> show good OER property with overpotential of 333 mV. Mn-Cd-S@amorphpus-Ni<inf>3</inf>S<inf>2</inf> shows more favorable kinetics than that of Mn-Cd-S for OER. Moreover，the mechanism of the enhanced photo/electrocatalytic performance is investigated in detail. This work provides references for developing the catalysts with both photocatalytic and electrocatalytic properties.<br/> © 2019 Elsevier B.V.
Volume:491
Issue:*
Translation or Not:no