Scientists take strides towards entirely renewable energy

phys.org | 11/29/2018 | Staff
Micaella (Posted by) Level 3
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Scientists from Trinity College Dublin have taken a giant stride towards solving a riddle that would provide the world with entirely renewable, clean energy from which water would be the only waste product.

Reducing humanity's carbon dioxide (CO2) emissions is arguably the greatest challenge facing 21st century civilisation—especially given the ever-increasing global population and the heightened energy demands that come with it.

Beacon - Hope - Idea - Electricity - Water

One beacon of hope is the idea that we could use renewable electricity to split water (H2O) to produce energy-rich hydrogen (H2), which could then be stored and used in fuel cells. This is an especially interesting prospect in a situation where wind and solar energy sources produce electricity to split water, as this would allow us to store energy for use when those renewable sources are not available.

The essential problem, however, is that water is very stable and requires a great deal of energy to break up. A particularly major hurdle to clear is the energy or "overpotential" associated with the production of oxygen, which is the bottleneck reaction in splitting water to produce H2.

Elements - Water - Ruthenium - Iridium - Metals

Although certain elements are effective at splitting water, such as Ruthenium or Iridium (two of the so-called noble metals of the periodic table), these are prohibitively expensive for commercialisation. Other, cheaper options tend to suffer in terms of their efficiency and/or their robustness. In fact, at present, nobody has discovered catalysts that are cost-effective, highly active and robust for significant periods of time.

So, how do you solve such a riddle? Stop before you imagine lab coats, glasses, beakers and funny smells; this work was done entirely through a computer.

Chemists - Physicists - Trinity - Team - Breakthrough

By bringing together chemists and theoretical physicists, the Trinity team behind the latest breakthrough combined chemistry smarts with very powerful computers to find one of the "holy grails" of catalysis.

The team, led by Professor Max García-Melchor, made...
(Excerpt) Read more at: phys.org
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