Finding the chemical carrier option for hydrogen storage

Interests successful hydrogen are rapidly increasing owed to its imaginable to found planetary cleanable vigor proviso chains. A emblematic method of hydrogen retention is physically storing hydrogen specified arsenic compression oregon liquefaction, which requires higher vigor to summation retention capableness and costly distributing infrastructure. To flooded these limitations, probe efforts to store hydrogen chemically successful liquid carriers, specified arsenic liquid integrated hydrogen carriers (LOHCs) oregon ammonia, person been conducted. Hydrogen tin beryllium safely stored successful LOHCs astatine country somesthesia and atmospheric unit earlier being extracted astatine locations for hydrogen consumption.

Various integrated compounds person been suggested for LOHCs. However, determination were fewer comparative studies connected LOHC performance, starring to a deficiency of technological statement successful the hydrogen assemblage for downselecting LOHCs and catalysts. Scientists astatine Korea Institute of Science and Technology (KIST) person contributed to the improvement of a high-throughput benchmarking protocol for the adoption of promising LOHCs and their well-matched catalysts. The KIST LOHC probe squad successful the Hydrogen and Fuel Cell Research Center led by Dr. Yongmin Kim developed a semi-automatic valuation strategy for LOHC dehydrogenation (alternatively, hydrogen extraction from LOHC). This strategy allows america to rapidly trial dehydrogenation successful well-defined and standardized reaction conditions and transportation retired comparative analyses to gully retired optimal solutions for the palmy commercialized deployment of LOHCs.

One illustration of LOHC successful the analyses is methylcyclohexane (MCH) with precocious technological readiness. It shows a higher dehydrogenation complaint with minimal byproduct formation. Monobenzyltoluene (MBT) is different promising campaigner due to the fact that it has been mass-produced arsenic a harmless chemic portion extracting hydrogen fast. A biphenyl-based eutectic substance developed by KIST successful 2017 shows 20% higher dehydrogenation complaint than those of different LOHCs. This biphenyl-based LOHC with a superior hydrogen retention density of 6.85 wt.%-H2 is applicable for onboard hydrogen retention specified arsenic successful hydrogen vehicles oregon trains.

The projected strategy for accelerated screening of LOHCs materials and catalysts volition beryllium besides adjuvant for some home and planetary probe collaborators successful manufacture and academia. In summation to ongoing probe collaboration with Hyundai Motor Group and Korea Gas Corporation, planetary collaborative probe projects with Germany and Japan are being planned to wide disseminate this generalized benchmarking LOHC survey level for accelerating LOHC deployment successful the hydrogen economy. Dr. Yongmin Kim said, "The as-developed level volition assistance make caller exertion for little outgo and vigor consumption, which are 2 cardinal bottlenecks for the commercialization of LOHC."

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More information: Yeonsu Kwak et al, Hydrogen accumulation from homocyclic liquid integrated hydrogen carriers (LOHCs): Benchmarking studies and energy-economic analyses, Energy Conversion and Management (2021). DOI: 10.1016/j.enconman.2021.114124

Provided by National Research Council of Science & Technology