Enum: HydrogenProductionMethod

Methods and processes for producing hydrogen.

Permissible Values

Value	Title	Meaning	Description	Close Mappings	Narrow Mappings	Byproduct	Dominant Method	Electrolyte	Feedstock	Maturity	Renewable	Temperature C
STEAM_METHANE_REFORMING	Steam Methane Reforming (SMR)		High temperature steam reacts with methane to produce hydrogen, carbon monoxide, and carbon dioxide.				True		natural_gas			700-1000
AUTOTHERMAL_REFORMING	Autothermal Reforming (ATR)		Combines steam reforming and partial oxidation using oxygen and steam to produce hydrogen from hydrocarbons.
PARTIAL_OXIDATION	Partial Oxidation (POX)		Exothermic process reacting hydrocarbons with limited oxygen to produce hydrogen and carbon monoxide.
COAL_GASIFICATION	gasification	CHMO:0001501	Conversion of coal to syngas (hydrogen and carbon monoxide) using high temperature and steam.
WATER_ELECTROLYSIS	Water Electrolysis		Splitting water into hydrogen and oxygen using electrical current. Can be powered by various energy sources.	sweet:procChemical/Electrolysis
ALKALINE_ELECTROLYSIS	Alkaline Electrolysis (AEL)		Electrolysis using alkaline solution (typically KOH) as electrolyte. Mature commercial technology.					alkaline		commercial
PEM_ELECTROLYSIS	PEM Electrolysis		Proton Exchange Membrane electrolysis using solid polymer electrolyte. Higher efficiency, faster response.					polymer_membrane		commercial
SOLID_OXIDE_ELECTROLYSIS	Solid Oxide Electrolysis (SOEC)		High temperature electrolysis using solid ceramic electrolyte. Higher efficiency when waste heat is available.					solid_oxide		emerging		700-850
METHANE_PYROLYSIS	Methane Pyrolysis		Thermal decomposition of methane into hydrogen and solid carbon without oxygen. Produces no direct CO2.			solid_carbon			natural_gas
BIOMASS_GASIFICATION	Biomass Gasification		Thermochemical conversion of biomass to hydrogen-rich syngas at high temperatures.		sweet:procPhysical/Gasification				biomass		True
BIOLOGICAL_PRODUCTION	Biological Hydrogen Production		Production of hydrogen by microorganisms through photosynthesis, fermentation, or other biological processes.							research	True
THERMOCHEMICAL_WATER_SPLITTING	Thermochemical Water Splitting		Using high temperatures from concentrated solar or nuclear to drive chemical cycles that split water.							research		500-2000
PHOTOELECTROCHEMICAL	Photoelectrochemical Water Splitting		Direct conversion of sunlight to hydrogen using specialized semiconductor materials in contact with water.							research

Slots

Name	Description
hydrogen_production_method	Method used to produce hydrogen

Identifier and Mapping Information

Schema Source

from schema: https://w3id.org/linkml/valuesets

LinkML Source

name: HydrogenProductionMethod
instantiates:
- valuesets_meta:ValueSetEnumDefinition
description: Methods and processes for producing hydrogen.
title: Hydrogen Production Method
from_schema: https://w3id.org/linkml/valuesets
see_also:
- https://www.energy.gov/eere/fuelcells/hydrogen-production
contributors:
- orcid:0000-0002-6601-2165
- https://github.com/anthropics/claude-code
status: DRAFT
rank: 1000
permissible_values:
  STEAM_METHANE_REFORMING:
    text: STEAM_METHANE_REFORMING
    description: High temperature steam reacts with methane to produce hydrogen, carbon
      monoxide, and carbon dioxide.
    annotations:
      feedstock:
        tag: feedstock
        value: natural_gas
      temperature_c:
        tag: temperature_c
        value: 700-1000
      dominant_method:
        tag: dominant_method
        value: true
    title: Steam Methane Reforming (SMR)
    aliases:
    - SMR
  AUTOTHERMAL_REFORMING:
    text: AUTOTHERMAL_REFORMING
    description: Combines steam reforming and partial oxidation using oxygen and steam
      to produce hydrogen from hydrocarbons.
    title: Autothermal Reforming (ATR)
    aliases:
    - ATR
  PARTIAL_OXIDATION:
    text: PARTIAL_OXIDATION
    description: Exothermic process reacting hydrocarbons with limited oxygen to produce
      hydrogen and carbon monoxide.
    title: Partial Oxidation (POX)
    aliases:
    - POX
  COAL_GASIFICATION:
    text: COAL_GASIFICATION
    description: Conversion of coal to syngas (hydrogen and carbon monoxide) using
      high temperature and steam.
    meaning: CHMO:0001501
    title: gasification
  WATER_ELECTROLYSIS:
    text: WATER_ELECTROLYSIS
    description: Splitting water into hydrogen and oxygen using electrical current.
      Can be powered by various energy sources.
    title: Water Electrolysis
    aliases:
    - Electrolysis
    close_mappings:
    - sweet:procChemical/Electrolysis
  ALKALINE_ELECTROLYSIS:
    text: ALKALINE_ELECTROLYSIS
    description: Electrolysis using alkaline solution (typically KOH) as electrolyte.
      Mature commercial technology.
    annotations:
      electrolyte:
        tag: electrolyte
        value: alkaline
      maturity:
        tag: maturity
        value: commercial
    title: Alkaline Electrolysis (AEL)
    aliases:
    - AEL
  PEM_ELECTROLYSIS:
    text: PEM_ELECTROLYSIS
    description: Proton Exchange Membrane electrolysis using solid polymer electrolyte.
      Higher efficiency, faster response.
    annotations:
      electrolyte:
        tag: electrolyte
        value: polymer_membrane
      maturity:
        tag: maturity
        value: commercial
    title: PEM Electrolysis
    aliases:
    - PEMEC
    - Polymer Electrolyte Membrane Electrolysis
  SOLID_OXIDE_ELECTROLYSIS:
    text: SOLID_OXIDE_ELECTROLYSIS
    description: High temperature electrolysis using solid ceramic electrolyte. Higher
      efficiency when waste heat is available.
    annotations:
      electrolyte:
        tag: electrolyte
        value: solid_oxide
      temperature_c:
        tag: temperature_c
        value: 700-850
      maturity:
        tag: maturity
        value: emerging
    title: Solid Oxide Electrolysis (SOEC)
    aliases:
    - SOEC
  METHANE_PYROLYSIS:
    text: METHANE_PYROLYSIS
    description: Thermal decomposition of methane into hydrogen and solid carbon without
      oxygen. Produces no direct CO2.
    annotations:
      feedstock:
        tag: feedstock
        value: natural_gas
      byproduct:
        tag: byproduct
        value: solid_carbon
    title: Methane Pyrolysis
    aliases:
    - Thermal Cracking
  BIOMASS_GASIFICATION:
    text: BIOMASS_GASIFICATION
    description: Thermochemical conversion of biomass to hydrogen-rich syngas at high
      temperatures.
    annotations:
      feedstock:
        tag: feedstock
        value: biomass
      renewable:
        tag: renewable
        value: true
    title: Biomass Gasification
    narrow_mappings:
    - sweet:procPhysical/Gasification
  BIOLOGICAL_PRODUCTION:
    text: BIOLOGICAL_PRODUCTION
    description: Production of hydrogen by microorganisms through photosynthesis,
      fermentation, or other biological processes.
    annotations:
      renewable:
        tag: renewable
        value: true
      maturity:
        tag: maturity
        value: research
    title: Biological Hydrogen Production
    aliases:
    - Biohydrogen
  THERMOCHEMICAL_WATER_SPLITTING:
    text: THERMOCHEMICAL_WATER_SPLITTING
    description: Using high temperatures from concentrated solar or nuclear to drive
      chemical cycles that split water.
    annotations:
      temperature_c:
        tag: temperature_c
        value: 500-2000
      maturity:
        tag: maturity
        value: research
    title: Thermochemical Water Splitting
  PHOTOELECTROCHEMICAL:
    text: PHOTOELECTROCHEMICAL
    description: Direct conversion of sunlight to hydrogen using specialized semiconductor
      materials in contact with water.
    annotations:
      maturity:
        tag: maturity
        value: research
    title: Photoelectrochemical Water Splitting
    aliases:
    - PEC

Enum: HydrogenProductionMethod

Permissible Values

Slots

See Also

Identifier and Mapping Information

Schema Source

LinkML Source