title: Polymer Electrolyte Membrane Electrolyzers Utilizing Non-precious Mo-based Hydrogen Evolution Catalysts.
abstract: The development of low-cost hydrogen evolution reaction (HER) catalysts that can be readily integrated into electrolyzers is critical if H2 from renewable electricity-powered electrolysis is to compete cost effectively with steam reforming. Herein, we report three distinct earth-abundant Mo-based catalysts, namely those based on MoSx , [Mo3 S13 ](2-) nanoclusters, and sulfur-doped Mo phosphide (MoP|S), loaded onto carbon supports. The catalysts were synthesized through facile impregnation-sulfidization routes specifically designed for catalyst-device compatibility. Fundamental electrochemical studies demonstrate the excellent HER activity and stability of the Mo-sulfide based catalysts in an acidic environment, and the resulting polymer electrolyte membrane (PEM) electrolyzers that integrate these catalysts exhibit high efficiency and durability. This work is an important step towards the goal of replacing Pt with earth-abundant catalysts for the HER in commercial PEM electrolyzers.
authors.affiliation: Department of Chemical Engineering, Stanford University, 443 Via Ortega, Stanford, CA, 94305, USA.
authors.forename: Jia Wei Desmond
authors.initials: JW
authors.lastname: Ng
authors.affiliation: Department of Chemical Engineering, Stanford University, 443 Via Ortega, Stanford, CA, 94305, USA.
authors.forename: Thomas R
authors.initials: TR
authors.lastname: Hellstern
authors.affiliation: Department of Chemical Engineering, Stanford University, 443 Via Ortega, Stanford, CA, 94305, USA.
authors.forename: Jakob
authors.initials: J
authors.lastname: Kibsgaard
authors.affiliation: Department of Chemical Engineering, Stanford University, 443 Via Ortega, Stanford, CA, 94305, USA.
authors.forename: Allison C
authors.initials: AC
authors.lastname: Hinckley
authors.affiliation: Department of Chemical Engineering, Stanford University, 443 Via Ortega, Stanford, CA, 94305, USA.
authors.forename: Jesse D
authors.initials: JD
authors.lastname: Benck
authors.affiliation: Department of Chemical Engineering, Stanford University, 443 Via Ortega, Stanford, CA, 94305, USA. jaramillo@stanford.edu.
authors.forename: Thomas F
authors.initials: TF
authors.lastname: Jaramillo
mesh_terms: D002244:Carbon / Q000737:chemistry; D002384:Catalysis; D004220:Disulfides / Q000737:chemistry*; D004563:Electrochemistry; D004572:Electrolysis; D004573:Electrolytes; D005465:Fluorocarbon Polymers / Q000737:chemistry*; D006859:Hydrogen / Q000737:chemistry*; D008982:Molybdenum / Q000737:chemistry*; D049329:Nanostructures / Q000737:chemistry; D010984:Platinum / Q000737:chemistry
chemical_list: D004220:Disulfides; D004573:Electrolytes; D005465:Fluorocarbon Polymers; C040402:perfluorosulfonic acid; D010984:Platinum; D002244:Carbon; D006859:Hydrogen; D008982:Molybdenum; C082964:molybdenum disulfide
keywords: electrolyzers; energy conversion; hydrogen evolution; molybdenum; non-precious