Recently, a team led by Academician Li Can, the State Key Laboratory of Catalysis Fundamentals and the Solar Energy Research Department of the Dalian Institute of Chemical Physics, the Chinese Academy of Sciences, developed a new generation of electrolyzed water catalysts. ) Hydrogen Energy Technology Co., Ltd. has achieved stable operation on large-scale alkaline electrolyzed water hydrogen production pilot demonstration equipment.

After long-term operation verification under rated conditions, the current density of electrolyzed hydrogen production is stable at 4000 amperes per square meter, the unit hydrogen production energy consumption is lower than 4.1 kWh per cubic meter of hydrogen, and the energy efficiency value is greater than 86% When the density is stable at 3000 amps per square meter, the energy consumption per unit of hydrogen production is lower than 4.0 kWh per cubic meter of hydrogen, and the energy efficiency is about 88%. This is currently known as the highest efficiency of large-scale electrolysis of water to produce hydrogen.

The use of solar energy and other renewable energy sources to decompose water to produce hydrogen is the only way to achieve a green hydrogen energy economy and the future development direction of hydrogen sources for hydrogen fuel cells. The key step in the conversion and storage of solar energy and other renewable energy into chemical energy is the process of water decomposition (photolysis and electrolysis of water). Among them, the hydrogen production technology of electrolyzed water is relatively mature, and has been industrialized. However, the energy conversion efficiency of hydrogen production from electrolyzed water has been hovering between 50% and 70% for a long time, which is one of the main reasons for the high cost of electrolyzed water. Therefore, this progress will have important scientific and practical significance for promoting the development of the hydrogen energy field and realizing the hydrogen energy economy.

It is reported that the new generation of electrocatalysts developed by the team will be assembled in a 1000-cubic-hour / hour electrolyzed hydrogen production unit and applied to the 1,000-ton solar fuel industrialization demonstration project in Lanzhou New District. Energy consumption is reduced by more than 15%, improving the energy efficiency of the electrolyzed water-to-hydrogen industry, significantly reducing costs, and promoting the realization of large-scale industrialization of electrolyzed water. (Reporter Liu Wansheng correspondent Yao Tingting)

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