Can biochar cut the cost of green hydrogen?

Biochar-derived carbon nanomaterials are being explored as a potential solution to reduce the costs associated with green hydrogen production. Researchers from Swami Rama Himalayan University and Graphic Era (Deemed to be University) have reviewed the use of these materials, which are produced by thermally decomposing biomass under limited-oxygen conditions. These materials, including carbon nanotubes, graphene, and carbon quantum dots, offer high surface area, excellent electrical conductivity, and favorable electrocatalytic properties.

The review, published in Next Energy, highlights the potential of biochar-derived carbon nanomaterials to serve as catalysts in hydrogen production. The process of turning biomass into usable biochar involves extensive mechanical, thermal, and chemical treatments, which are not yet fully understood at an industrial scale. Despite the challenges, the potential to upscale low-value biomass, capture carbon, and reduce the cost of green hydrogen makes this technology attractive.

Biochar is a carbon-rich material produced by heating biomass, such as agricultural residues and wood waste, under oxygen-limited conditions. The production process can involve pyrolysis, gasification, or hydrothermal carbonization. Biochar can be processed into carbon nanomaterials suitable for hydrogen-production research, with some proposed catalysts being metal-free and others combining biochar-derived carbon with metals like cobalt and iron.

The researchers emphasize the need for systematic understanding and optimization of biochar-based carbon nanostructures as efficient, affordable electrocatalysts for hydrogen production. The lack of homogeneity in biochar characteristics and the need for standardization in production and performance testing are highlighted as challenges to industrial application.

Plug Power Inc., a company involved in hydrogen production and electrolyzer manufacturing, could potentially benefit from advancements in biochar-derived materials. However, these materials remain at the laboratory stage, and there is no indication that Plug Power currently uses or plans to use them. The company's relevance to this research is primarily through its electrolyzer business, which currently depends on platinum-group metal catalysts.