Copying Nature’s photosynthesis Process To Convert Light Energy To Chemical Energy

One of the most interesting talks at AAAS is about a discovery that may ultimately give the much-vaunted hydrogen economy an opportunity. Daniel Nocera, Professor of Energy and Professor of Chemistry at MIT delivered a plenary lecture on a new catalyst produced in his research lab, one that gets inspiration from the photosynthetic pathways inside plant cells to break up body of water into H2 and O2, giving up the H2 to be utilized as fuel.


Fulfilling the human’s future energy need is going to require the sun, said by Nocera, and that is only going to occur if we can stock that energy for utilization when it is not beaming. Plants developed to take advantage of high-power chemical bonds, and the oil, gas, and coal we presently utilize is just stored sunlight (thru plants), even though concentrated. Hydrogen is the single practicable solution compared to batteries, capacitors, or mechanical storage systems like pumped-up water or compressed air when you consider energy density and the work from his research laboratory may help do that possible.

It is no understatement to suppose that the next of fuels is a hot issue. Addressing with global climate change entails going away from using coal, oil, and gas, but presently these constitute the mass of our energy supplying, and it can be tough to consider what could take up their slack. Energy projects for 2050 propose the earth will require between 28-35 terawatts (TW) per year, increasing from approximately 13TW in 2000. Nuclear will surely be an element but 8 TW of atomic power requires 8000 new powerhouses, or 1 fresh plant for each 1.4 days. Still the most hardcore advocates of the atom do not believe that is potential to occur.

Biomass, whether it is switchgrass, miscanthus, or bioengineered algae, bears a theoretical maximal limit at approximately 7TW. Physical science prescribes the limit of wind power, and damming every river and stream would give less than one TW. Therefore you can check why everybody is trapping their desires on that bully thermonuclear reactor in the sky.

Nocera is not the single one recommending solar power as the time to come, but he proposes an answer to the troubles called forth regarding energy storage. Nocera’s tack is to transcript photosynthesis to change light energy over to chemical energy, but to break at H2 rather than trying to produce sugars, lignins, etc. Compressed H2 at 300 bar takes approximately 143 MJ/kg, many magnitudes more than the modernist electric batteries or capacitors, and as you can acquire H2 from water, and burning it just imparts you that H2O back over again; it gives lot of sense in a post-carbon world.

Other groups have given lot of time and money experimenting on unreal photosynthesis, but their tries have been misguided, he claims. Artificial oxygen developing composites (OECs) tend to be extremely unstable, so laboratories focus on making them stay longer with exotic and costly stuffs. This not only thrusts the financial tolls to high levels but it also makes it more difficult to force electrons into them, bringing down efficiency.

Nature, however, employs a simple inorganic oxidoreduction core that self-assembles from water. It is unstable, thus plants mend and substitute their OECs each half-hour (approximately), and that is what Nocera’s artificial OEC does also. Rather than Mn and Ca, it utilizes Co and Pi, works in sea water, dirty water, or a glass of water, and amends itself in a spontaneous manner.

When joined with more far-flung solar panels and more effective fuel cells, Nocera thinks that this CoPi accelerator would supply a family’s daily fuel requirements from 8- ls of water. I hope he is right.