Huge Potential Breakthrough for Solar Energy

The utilization of solar energy on a large scale requires its storage. In natural photosynthesis, energy from sunlight is used to rearrange the bonds of water to O2 and H2-equivalents. The realization of artificial systems that perform similar “water splitting” requires catalysts that produce O2 from water without the need for excessive driving potentials. Here, we report such a catalyst that forms upon the oxidative polarization of an inert indium tin oxide electrode in phosphate-buffered water containing Co2+. A variety of analytical techniques indicates the presence of phosphate in an approximate 1:2 ratio with cobalt in this material. The pH dependence of the catalytic activity also implicates HPO42– as the proton acceptor in the O2-producing reaction. This catalyst not only forms in situ from earth-abundant materials but also operates in neutral water under ambient conditions.

In Situ Formation of an Oxygen-Evolving Catalyst in Neutral Water Containing Phosphate and Co2+ — Kanan and Nocera, 10.1126/science.1162018 — Science

Don’t you just love the title of the paper? I would have titled the paper “Splitting Water for Cheap”. The author is interviewed here. This catalyst can split water into H2 and O2 using the energy from a solar cell. Then, when you need electricity, you recombine them in a fuel cell to make water and electricity. So, a closed loop with the only external input being the solar energy. Solar energy can now be stored almost painlessly.

It is so simple. I am listening to the interview and the author says this can be replicated in a chemistry lab as it only needs a phosphate buffer, cobalt electrode and a conducting glass.

Wonderful. Now, please stop building coal plants.

Tags: ,

Similar Posts

  • North Carolina Mercury Alert

    Mercury is a trace element present in coal/oil that is emitted when coal is combusted for energy – Coal fired power plants account for 40% of all Mercury emissions in the USA.

    Is $10 a Year Too Much?

    Courtesy the North Carolina Conservation Network
    They alerted me to this opinion piece in the News & Observer

    North Carolina municipalities are demanding it. Other states are doing it. Now our state must impose maximum available control technology on all coal-burning power plants to reduce mercury emissions by 90 percent as quickly as possible.

    Why? Because it is the best way to protect our most precious natural resource, the brainpower of our children.

    Against the strong advice of the pediatric and public health communities, in 2005 the U.S. Environmental Protection Agency passed a wimpy rule to reduce mercury emissions from coal-burning power plants 70 percent by 2018. The rule also allows a “cap and trade” process, which may produce local hotspots of mercury pollution.

    Later…

    Prenatal exposure at levels consistent with consumption of contaminated fish can lead to IQ loss, memory and attention problems, fine motor deficits and developmental delay. These changes are likely permanent.

    Estimated costs to consumers are about $4-$10 per year.

    This is a no-lose situation. Merury controls are easy to implement, cheap, and requires nothing other than the tweaking of already existing controls. The only reason not do this is knee jerk opposition to even sensible regulation on the part of powerful entities (check out the sweet astroturf on that website!) that have the ear of the federal government.

    The NC Conservation Network is running a campaign to toughen the proposed NC law. Please comment if you live in NC.

    Mercury regulation is a case where the EPA’s much maligned command and control regulation works better than cap and trade policies because mercury is in the unique position of being both a  local and long range pollutant. Local pollutants have to be controlled at each source, so the Federal government’s proposed legislation is a bad idea and states are trying to do better.

  • On writing

    Sometimes, you have to read what you’ve written in order to keep writing. I have not felt like writing at all, except in 140 character snippets. There are lots of people saying lots of things all the time, so who really cares, right? But I came back and read a post or two I had written on this blog, they weren’t half bad.

    Consider myself a little more encouraged, I shall write more, soon, no pressure 🙂

  • BC Carbon Tax regressive?

    British Columbians with low incomes will benefit from the carbon tax in its first year, but will pay more by the scheme’s third year, a new study concludes.

    The impact of the tax and its offsetting income tax cuts will become increasingly unequal unless the provincial government increases payments to low-income earners, the study says.

    The study, by Marc Lee, senior economist with the Canadian Centre for Policy Alternatives, and Toby Sanger, senior economist with the Canadian Union of Public Employees, takes a detailed look at the fairness of the controversial tax.

    via Carbon Tax Whacks the Poor, Later :: News :: thetyee.ca

    The report makes some good points. Revenue neutrality (the offsetting of carbon taxes with income/corporate tax cuts) has nothing to do with reducing carbon emissions. If I were to redesign this tax, I would do as the report says, increase rebates to lower income people, reduce corporate tax cuts so that the resulting revenue can be used to fund more transit infrastructure, energy efficiency infrastructure and the building of a low carbon economy.

    A carbon tax in itself is not sufficient to reduce emissions. It does its part, but building an energy efficient, low carbon infrastructure will do a lot more and the money’s there, just use it.

    You can read the whole report here.

  • Rolling Stone Magazine Expose' on the Pork Industry

    Excellent article, read in full, and let the next mass market pig you eat weigh on your conscience a little bit.

    I have attended meetings organized by the North Carolina Environmental Justice Network recently, and Smithfield foods is high on their agenda for the mind blowing pollution that overwhelmingly affects the poor and rural African-American communities, for their appalling safety record, and early American style treatment of its workers. See this PBS video for more. It is truly heartbreaking to hear testimony from people who live near hog farms, how the stench is overwhelming, omnipresent, and travels in your clothes and system wherever you go.

    Some Excerpts:

    Rolling Stone : Pork’s Dirty Secret: The nation’s top hog producer is also one of America’s worst polluters

    Smithfield Foods, the largest and most profitable pork processor in the world, killed 27 million hogs last year. That’s a number worth considering. A slaughter-weight hog is fifty percent heavier than a person. The logistical challenge of processing that many pigs each year is roughly equivalent to butchering and boxing the entire human populations of New York, Los Angeles, Chicago, Houston, Philadelphia, Phoenix, San Antonio, San Diego, Dallas, San Jose, Detroit, Indianapolis, Jacksonville, San Francisco, Columbus, Austin, Memphis, Baltimore, Fort Worth, Charlotte, El Paso, Milwaukee, Seattle, Boston, Denver, Louisville, Washington, D.C., Nashville, Las Vegas, Portland, Oklahoma City and Tucson.

    To appreciate what this agglomeration of hog production does to the people who live near it, you have to appreciate the smell of industrial-strength pig shit. The ascending stench can nauseate pilots at 3,000 feet. On the day we fly over Smithfield’s operation there is little wind to stir up the lagoons or carry the stink, and the region’s current drought means that lagoon operators aren’t spraying very frequently. It is the best of times. We can smell the farms from the air, but while the smell is foul it is intermittent and not particularly strong.Unsurprisingly, prolonged exposure to hog-factory stench makes the smell extremely hard to get off. Hog factory workers stink up every store they walk into. I run into a few local guys who had made the mistake of accepting jobs in hog houses, and they tell me that you just have to wait the smell out: You’ll eventually grow new hair and skin. If you work in a Smithfield hog house for a year and then quit, you might stink for the next three months.

    Epidemiological studies show that those who live near hog lagoons suffer from abnormally high levels of depression, tension, anger, fatigue and confusion. “We are used to farm odors,” says one local farmer. “These are not farm odors.” Sometimes the stink literally knocks people down: They walk out of the house to get something in the yard and become so nauseous they collapse. When they retain consciousness, they crawl back into the house.

    Successful Farming magazine warned — six years ago. There simply is no regulatory solution to the millions of tons of searingly fetid, toxic effluvium that industrial hog farms discharge and aerosolize on a daily basis. Smithfield alone has sixteen operations in twelve states. Fixing the problem completely would bankrupt the company. According to Dr. Michael Mallin, a marine scientist at the University of North Carolina at Wilmington who has researched the effects of corporate farming on water quality, the volumes of concentrated pig waste produced by industrial hog farms are plainly not containable in small areas. The land, he says, “just can’t absorb everything that comes out of the barns.” From the moment that Smithfield attained its current size, its waste-disposal problem became conventionally insoluble.

    Nice, huh! Still eating factory pork?

  • NC Phosphate Mine to expand: wetlands in trouble

    newsobserver.com | Mine plan would erase wetlands

    The proposal by PCS Phosphate, if approved, would represent the single largest destruction of wetlands permitted in the state — 2,500 acres including the headwaters of seven creeks near the Pamlico River. The rich deposit of black phosphate rock, left by ancient oceans and buried 100 feet beneath the surface, has been extracted from the site by various companies for about 40 years. PCS has worked the mine since 1995 to get phosphate for fertilizer and for use in food additives. In food, it’s turned into phosphoric acid — a flavor enhancer in such products as Coca-Cola, jellies and vegetable oil.

    Yes, this is right, phosphoric acid is a “flavor enhancer”. Well, the mine employs a 1000 people in the area, and is not necessarily an evil that must be stopped at all times, for that, see Hog Factories! But this disturbs me.

    Hunter Turnage, 44, a Raleigh cable television salesman, has a house across the river from the PCS mine. He is one of several people who have written letters to the state complaining about the odor when the wind blows from the south.

    “If you don’t want to smell it, you shut up the windows and turn on the air conditioner,” Turnage said.
    “It’s something you just deal with. … I kept thinking one day they would run out of areas to mine. I think they’ll stay there forever –as long as they get continued rights to destroy the wetlands.”

    It’s one thing to use up wetlands, knowing fully well that the law requires you to create wetlands elsewhere to compensate, this smell issue is more problematic, and hard to legislate. Which means that various Environmental Justice issues will also come into play.

  • USGS Releases Study on US Well Water

    The actual journal paper seems to be behind a subscription wall. But, here’s a summary…

    ScienceDaily: Chemical Quality Of Self-Supplied Domestic Well Water

    Since the water quality of domestic wells is not federally regulated or nationally monitored, this study provides a unique, previously nonexistent perspective on the quality of the self-supplied drinking water resources used by 45 million Americans in the United States. This national reconnaissance study is based on a compilation of existing data from a very large number of wells sampled as part of multiple USGS programs.

    Well water is not held to the same standards as municipal water, which means it is not normally tested for nasties such as arsenic.

    gwmr_89_f4.gif
    Well (no pun intended!), looky here, but arsenic levels in well water exceed EPA Maximum Contaminant Levels (MCLs) more than 10% of the time. If, and this is a big if, you extrapolate these results to the whole country, as much as 5 million people may be exposed to higher than allowed arsenic levels. Arsenic is a notorious contaminant with an MCL of 0.01 mg/L, down a factor of 5 as of January 2006 due to data that indicates effects at even lower doses.

    If I drank well water, I would get it tested for arsenic.

    gwmr_89_f1.png
    Most of the results are from the North East, which means that outside research circles (and behind subscription walls), groundwater arsenic levels could be a significant problem that not too many people are aware of.

    All figures are from the paper.

    Reference

    Focazio, Michael J., Tipton, Deborah, Dunkle Shapiro, Stephanie & Geiger, Linda H. (2006) The Chemical Quality of Self-Supplied Domestic Well Water in the United States. Ground Water Monitoring & Remediation 26 (3), 92-104. doi: 10.1111/j.1745-6592.2006.00089.x