Integration hydrogen evolution and water-cleaning via robust graphene supported noble-metal-free Fe1-xCoxS2 system
In electrocatalytic hydrogen evolution reaction (HER) system, cathodic H+ resource, anodic sacrificial agent and robust catalysts are three essential factors. Industry wastewater emission, containing high acidity and organic dyes, actually can satisfy the material requirements for HER. Herein, a new HER method is proposed by taking acidic ions from wastewater as cathodic resource to produce H2, while organic dyes waste as anodic sacrifices to balance the reaction. In such way, sustainable H2 energy source can be generated and clean water is obtained as well. Towards HER catalyst, low cost and high efficient graphene supported Fe1-xCoxS2 was synthesized with onset overpotential of ~ 50 mV and demonstrated impressive HER performances in both practical industry wastewater and analogous wastewater simulations. Besides the cathodic H2 evolution, anodic organic dyes (MO, MB, RhB and industry waste organic dyes) were all able to be entirely decomposed within 8 min, 18 min, 9 min and 4h under oxidation potential ~ 1.46, 1.50, 1.47 and 1.40 V. As verified both in practical industry wastewater and wastewater simulation in laboratory, our approach for integrating HER and wastewater treatment put forward an attractive chance in the research field of energy and environment.