Paper-based Hydrogen Sensors

­A low-cost, rapid and reliable paper-based sensor for the detection of hydrogen. Background: Though hydrogen (H2) offers a clean, high energy density fuel alternative (vs. conventional fossil fuels), its high flammability with a lower explosion …

­A low-cost, rapid, and reliable paper-based sensor for the detection of hydrogen. Background: Though hydrogen (H2) offers a clean, high energy density fuel alternative (vs. conventional fossil fuels), its high flammability with a lower explosion limit of 4%, low ignition energy, and ability to permeate through many materials present a need for rapid, reliable and low-cost H2 sensors. These sensors must be able to detect H2 over a wide concentration range (0.1-10%), and reliably work across wide ranges of temperature (-30 to 80ºC) and humidity (10-98%). Further, these sensors must be able to selectively identify H2 in the presence of other gases as well as provide a long lifetime with minimal maintenance and expense. While optical and chemiresistive sensors have been explored, neither has yet demonstrated an ability to meet all of the various requirements. Technology Overview: This invention provides hydrogen sensors comprised of one or more palladium (Pd) nanostructures (Pd-based nanowires or Pd alloy nanosheets) deposited on a porous substrate such as paper. Paper-based sensors are the preferred substrate due to their low-cost, portability, flexibility, and degradability. These Pd-comprising sensors permit H2 to absorb on the Pd nanostructure at ambient conditions to reversibly and selectively form Pd hydrides that possess lower conductivity than Pd, thus the change in resistance enables efficient detection. Sensors prepared using nano-inks prepared from solution-phase synthesized Pd nanowires of ultrathin diameter (<5 nm) that were treated with ozone-producing UV light exhibited fast response (6.5 s, 3.4 s) and recovery (8.5 s, 11 s) times to 0.1% and 1% H2 in air, respectively. The sensor's ability to detect such low concentrations of H2 in the air was seen at temperatures ranging from -15 to 80ºC. The sensors also displayed hysteresis-free responses and were able to selectively detect H2 concentrations as low as 10ppm in air. Inexpensive paper substrates, low loading requirements, and simple and scalable fabrication of these sensors offer a low-cost, rapid, and reliable means for selective detection of H2, especially at low concentrations. Advantages:

  • Low cost
  • Sensitive (low ppm detection)
  • Selective
  • Lacks problematic reversing sensing behavior

Applications:

  • Hydrogen generation plants
  • Transportation, including both Hdelivery and fuel cell vehicles
  • Hydrogen delivery/pumping stations

Intellectual Property Summary: US Provisional Patent Application 63/286,056 filed December 5, 2021. Stage of Development: Lab-based Prototypes Licensing Status: Available for licensing or collaboration. Publication link: ACS Appl. Nano Mater. 2022.

Website

https://suny.technologypublisher.com/tech/Paper-based_Hydrogen_Sensors

Contact Information

TTO Home Page: https://suny.technologypublisher.com

Name: Timothy Dee

Title: Associate Director

Email: tpdee@buffalo.edu

Phone: 716-645-8139