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Advanced materials: clean water and nitrogen cycle to promote sustainable development of energy and environment

wallpapers Nicaragua News 2020-07-01

throughout the history of the world's energy development in ancient times the human dem for energy all came from the light heat brought by the solar radiation drilling wood for fire to achieve energy conversion human beings began to enter the long "firewood age" the invention of steam engine promoted the first major change of human energy entered the "coal age" with the discovery of electromagnetic induction phenomenon the world gradually entered the "coal age" In the "electric age" the invention of internal combustion engine triggered the second major change of human energy entered the "oil age" which broke out in an all-round way. However the reserves of traditional fossil fuels in the earth are limited will gradually be exhausted their large-scale combustion has caused a series of environmental problems such as global warming polar glacier melting extreme weather surge. It is urgent to seek clean sustainable energy to realize the vigorous development of "new energy era". Water nitrogen are rich in natural resources in the earth. The rational use of water nitrogen to build a new mode of energy conversion utilization will add bricks tiles to the sustainable development of energy environment.

recently Wu Gang's team at the State University of New York at Buffalo proposed that clean sustainable water nitrogen cycle can be realized through electrolysis of aquatic hydrogen electrochemical ammonia synthesis fuel cell technology which provides a new idea for promoting the sustainable development of energy environment. Key points of

: This paper introduces the use of renewable solar energy wind energy water energy for power generation. Hydrogen is produced by electrolysis of water ammonia is synthesized by electrochemical synthesis of nitrogen water. The hydrogen ammonia can be used as fuel directly for fuel cell power generation for motor vehicles residents the final product is still nitrogen water. Key points of

: This paper mainly introduces the key catalytic reactions involved in electrolytic hydrogen production proton exchange membrane fuel cell (PEMFC) electrochemical ammonia synthesis direct ammonia fuel cell (DAFC) including oxygen evolution reaction (OER) oxygen reduction reaction (ORR) nitrogen reduction reaction (NRR) ammonia oxidation reaction (AOR). In this paper according to the order of catalytic mechanism noble metal (PGM) catalyst non noble metal (PGM free) catalyst membrane electrode (MEA) performance the above four kinds of catalytic reactions are introduced one by one. Combined with examples the design synthesis strategy of catalyst activity enhancement mechanism reasons for stability change etc. are analyzed the feasible strategies for improving catalyst activity stability are pointed out.

The third point of

: it is pointed out that ordered PTM alloy nanoparticles (i.e. intermetallic compound nanoparticles) single atom catalyst (SAC) are considered to be the most promising catalyst materials at present. The key to improve the activity of PGM catalyst is to accurately control the atomic structure regulate the surface electronic state morphology preparation process to adjust the coordination environment of single atom strengthen the gold The interaction between supports increasing the density of active sites are the key to enhance the activity of sac catalyst.

Key point 4 of

: these new energy devices need to work under harsh oxidation or reduction conditions involving the complex reaction process of catalyst electrolyte reaction gas three-phase interface. This paper points out that combining the research of catalyst with the development of membrane electrode assembly (MEA) technology the gas diffusion charge transfer proton transport involved in the reaction are deeply discussed Key science. The fifth key point of

: finally the paper summarizes the opportunities challenges in the future development of the four new energy devices the catalyst materials used in the four key catalytic reactions.

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