Researcher Han Hongxian and academician Li Can of the Dalian Institute of Chemical Physics, Chinese Academy of Sciences have collaborated with the Japanese Institute of Physics and Chemistry to develop an inexpensive electrocatalyst that can electrolyze water with long life under strong acid conditions Application in hydrogen technology. Related research results were published in "German Applied Chemistry".
Converting solar energy into "solar fuel" commonly known as "liquid sunlight" is an important renewable energy strategy to deal with future depletion of fossil fuels and climate change. In recent years, solar and other renewable energy generation has gradually become a large-scale power generation technology. The use of photovoltaic power to drive electrolyzed water (PV-E) to produce hydrogen is currently the most promising hydrogen production technology using renewable energy on a large scale. Among many electrolyzed water technologies, proton exchange membrane electrolyzed water technology has attracted widespread attention. However, this technology works under strong acid conditions and most catalysts are unstable. At present, only the precious metal iridium (Ir) can work stably in the acidic environment of proton exchange electrolyzed water, which greatly limits the large-scale application of PEM electrolyzed water technology. Therefore, the development of cheap, efficient, and stable electrolytic water catalysts that can replace precious metals is particularly critical to the development of large-scale low-cost PEM electrolyzed hydrogen production technology.
It is understood that the research team of Dalian Institute of Chemical Physics, Chinese Academy of Sciences has long been devoted to the research of photocatalysis, photoelectrocatalysis and electrocatalytic water splitting to produce hydrogen and the development of catalysts. During the research process, based on previous explorations, researchers discovered that γ-MnO2 (γ-type manganese dioxide) can achieve stable electrocatalytic water decomposition under strong acid conditions within a special potential window, and achieved a long-life work of more than 8,000 hours. . In addition, the cooperative research team also used in-situ spectroelectrochemistry and other methods to systematically study the mechanism of this catalyst under the strong acidic conditions to electrocatalyze the water decomposition reaction.
Relevant technical personnel said that non-precious metal electrocatalysts can become long-life decomposition water under strong acid conditions, which opened new ideas for the development of cheap, stable and efficient catalysts for water decomposition to produce hydrogen, and also promoted the development and utilization of clean energy. effect. (Reporter Hao Xiaoming)
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