Leather processing generates significant waste, but a new project is turning one of its most common byproducts—biomass-rich chrome shavings—into a resource for high-value applications, specifically energy-storage components.

This initiative, part of the Sustainable Materials and Process Innovation theme of the LASRA SSIF Platform, aims to repurpose these shavings by leveraging the material’s intrinsic crosslinked structure, which reduces the need for expensive chemical processing and offers a sustainable advantage.

Key Project Achievements to Date

The project has moved successfully from theory to physical experimentation:

  • Formulations Produced: Eleven (11) formulations of chrome-shaving-based films have been produced.

  • Characterisation: Physical and thermal characterisations were completed in-house.

  • Advanced Testing: SAXS (Small-Angle X-ray Scattering) experimental work was conducted at SOLEIL, France.

Preliminary Findings

Initial results demonstrate the material’s promise and the feasibility of the preparation method:

  • Consistency: Film thickness was consistent (less than 20 nm) across most variants, except for PAA/PVA formulations.

  • Mechanical Strength: Mechanical and thermal properties showed no significant differences across the tested formulations.

  • Scalability: The preparation process used for the films is considered scalable for larger production.

While the results are positive, further structural (SAXS) and electrochemical (impedance) testing is needed to fully characterise the materials.

What’s Next?

Current and ongoing work focuses on deep analysis and application testing:

  • Data Modelling: Post-SAXS data analysis and model fitting are underway.

  • Electrochemical Testing: Electrochemical characterisation is being conducted by colleagues at Earth Sciences NZ.

  • SANS: A decision is pending regarding SANS (Small-Angle Neutron Scattering) work.

This project highlights how waste streams in traditional industries like leather can be transformed into advanced, sustainable components, pushing the boundary of material science.

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