Electrolysis of seawater for hydrogen production has been an important technology in the energy industry for many years. However, from the perspective of impurities in seawater, it needs purification before electrolysis, which increases the cost. Recently, Chinese scientific research team has cracked a big problem of seawater hydrogen production, and directly uses seawater as pure water, which is expected to form a new global strategic industry of original Chinese.
According to the Shenzhen Special Zone Daily, on November 30, Xie Heping, academician of the Chinese Academy of Engineering, and his doctoral team from Shenzhen University and Sichuan University published a paper in Nature, which established a new principle and technology of phase transition transfer driven non-desalination of seawater direct electrolysis hydrogen production in situ based on the new idea of combining physics and electrochemistry.
The technology completely blocks out sea water ions,To achieve the high efficiency seawater direct electrolysis hydrogen production without desalination process, no side reaction, no additional energy consumption, can be directly in situ electrolysis hydrogen production in seawater.
Xie Heping's team proposed to solve the problems and challenges faced by direct seawater electrolysis hydrogen production by combining physical mechanics and electrochemistry. By cleverly combining physical and mechanical processes such as molecular diffusion and interfacial phase equilibrium with electrochemical reactions, a theoretical model of direct seawater electrolysis hydrogen production driven by phase transition and migration was established. The influence mechanism of interfacial pressure difference on the spontaneous phase transition mass transfer of seawater under the micron-level air gap pathway was revealed, and a dynamic self-regulating and stable electrolytic hydrogen production method based on electrochemical reaction and seawater migration was formed. This method solved the half-century problem of harmful corrosion, which had troubled the field of seawater electrolysis hydrogen production.
At the same time, the team developed the world's first 400 L/h seawater direct electrolysis in situ hydrogen production technology and equipment,More than 3,200 hours of continuous operation in Shenzhen Bay demonstrated the stability and scale of the technology.
At the same time, this principle technology can be explored and extended to multiple water resources (such as river water, waste water, salt lake, etc.) direct in-situ hydrogen production.
According to the authors of the paper, the technology of in-situ direct electrolysis of seawater without desalination is expected to be combined with offshore renewable energy in the future, so as to build an in-situ seawater direct electrolysis hydrogen production plant without desalination, additional catalyst engineering, seawater transport and pollution-free treatment.
The paper review experts think: This work offers an attractive strategy for using non-potable water for the production of socially and ecologically sustainable fuels, which I think is a major breakthrough. ”
“ Few papers have been able to credibly achieve large-scale stable hydrogen production from seawater, but the work in this paper does just that. Their perfect solution to a problem that has long plagued the field of seawater hydrogen production -- harmful corrosivity -- will open the door to low-cost fuel production and hopefully drive the revolution toward a more sustainable world. ”