Abstract
For treatment of sulfion-containing wastewater,coupling the electrochemical sulfion oxidation reaction(SOR)with hydrogen evolution reaction(HER)can be an ideal way for sulfur and H2 resources recovery.Herein,we synthesize a metal-modified carbon nanotube arrays electrode(Co@N-CNTs/CC)for SOR and HER.This electrode has excellent performance for SOR and HER attributed to the unique array structure.It can achieve 99.36 mA/cm2 at 0.6 V for SOR,and 10mA/cm2 at 0.067 V for HER.Density functional theory calculations verify that metal modification is able to regulate the electronic structure of carbon nanotube,which is able to optimize the adsorption of intermediates.Employed Co@N-CNTs/CC as bifunctional elec-trodes to establish a hybrid electrolytic cell can reduce about 67％of energy consumption compared with the traditional water splitting electrolytic cell.Finally,the hybrid electrolytic cell is used to treat actual sulfion-containing wastewater,achieving the sulfur yield of 30 mg h-1 cm-2 and the hydrogen production of 0.64mL/min.
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