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Indexed by:Journal Papers

Date of Publication:2020-05-01

Journal:ENVIRONMENTAL RESEARCH

Included Journals:PubMed、SCIE

Volume:184

Page Number:109283

ISSN No.:0013-9351

Key Words:Nitrogen-doped graphene aerogel; Hydrogen evolution reaction; Molybdenum carbide; Self-standing cathode

Abstract:A hydrothermal-annealing method was adopted to form nitrogen-doped graphene aerogel-supported molybdenum carbide (Mo2C/NGA) materials by using graphene oxide (GO), poly (propylene glycol) bis(2-aminopropyl ether) (D400 for short) and ammonium molybdate as precursors. The annealing temperature and GO/D400 wt ratio played an important role on the materials structure and electrocatalytic activity. When the annealing temperature reached to 800 degrees C, the Mo2C was formed as an active component and improved obviously the hydrogen evolution reaction (HER) activity. After introducing the appropriate amount of D400, the Mo2C/NGA material not only had a firm porous monolithic framework, but also presented an increasing HER activity. Further, the Mo2C/NGA-based microbial fuel cells-ammonia electrolysis cell (MFCs-AEC) coupled system was constructed and operated for higher hydrogen production. The coupled system produced hydrogen of 198 mL g(Mo2C/NGA)(-1) in simulated ammonia-rich wastewater. As using the actual landfill leachate wastewater as substrate, there was 79.2 mL g(Mo2C/NGA)(-1) of hydrogen production. All of these were attributed to the porous structure with an interconnected network and the nitrogen-doped structure of the NGA.