The hydrogen production process must be accompanied by conversion/conversion, which will inevitably lead to loss. From this perspective, we can analyze the hydrogen production technology of different hydrogen production plants in Chengdu: hydrogen production from traditional energy. For example, the hydrogen production from water gas mentioned by the subject has been carried out in industry, and the technology is relatively mature, but the output is greater than the input. The hydrogen produced from 1 kg of coal must be smaller than the original 1 kg of coal itself. Therefore, the traditional energy hydrogen production is not an ideal hydrogen production technology. The new energy source hydrogen production.

At present, the mainstream is hydrogen production by photo electrolysis of water and hydrogen production by photocatalysis. Among them, hydrogen production by light electrolysis of water is divided into two steps: a. solar power generation, b Use the electricity generated to electrolyze water. The utilization rate of solar energy in the process of solar power generation can reach 30% in the laboratory and close to 20% in large-scale application; However, the utilization rate of electric energy in water electrolysis process is more than 80%. Therefore, the overall conversion efficiency of light electrolytic water is 20% × 80 ≈ 16), although there are also losses, this local utilization of solar power generation has solved the problem that "most of the electricity generated by solar energy is unstable garbage electricity, and the grid refuses to accept photoelectric grid connection", so we are optimistic about the practical application of light electrolytic water.

On the other hand, in terms of academic research, the theoretical efficiency of silicon solar cells is more than 50%. Although the theoretical efficiency of electrolytic water can reach *, it is also very considerable, and there is little room for improvement. Therefore, the academic value of photoelectric hydrogen production is more concentrated in the research of solar cells, which does not belong to the category of hydrogen production technology. There is only one process for hydrogen production by photocatalysis: the actual conversion efficiency is less than 2%. Our students who do photocatalysis mourn all day long for being completely exploded by photoelectric devices. However, the leaders put forward that the theoretical efficiency of hydrogen production by photocatalysis is comparable to 20% of photoelectric devices, but our actual efficiency is only 1-2%, which means that there is still huge room for improvement in theory and practice, This is the significance of our research on photocatalysis. So if the subject wants to do academic research, then photocatalysis is undoubtedly more suitable - although the field of photocatalysis is at the later stage of a new wave brought about by the discovery of g-C3N4, and the heat has decreased

In fact, academicians of the Chinese Academy of Sciences dare not give you a definite answer to questions about the promising hydrogen production method of Chengdu hydrogen production plant. They even want to know more about the promising technology than you do. The significance of scientific research is to turn the uncertainty of the future into certainty.