Virulent E-Coli strain lives in grain-fed cattle.

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: Environment, Solar energy

Excellent article in today’s Washington Post

A Dated Carbon Approach

You can even cut carbon using no technology whatever. Mexico City has reduced its output of carbon dioxide by almost 55,000 tons a year by opening one efficient bus route; the key innovation here was the creation of two bus lanes. The new buses run on diesel — not exactly a technological breakthrough. But because they are rapid and frequent, the buses have brought car use down and reduced emissions. So what matters is not just the technologies we have but the incentives to deploy them. The average Western European uses half as much energy as the average American, and that’s not because there’s more technology in Europe. Rather, Europeans have embraced anti-carbon policies ranging from gas taxes to emissions caps, from an absence of extravagant mortgage subsidies that encourage super-size homes to congestion charges for drivers in London and Stockholm.

Sing it, Cap’n Obvious, actually, it is not obvious to a lot of people. Politicians love “research” because they can turn around and say that they are doing something about a problem when all they are doing is postponing the discussion by calling for “new technology” to fix the problem. Scientists like this as well because this means money in their pocket. Research groups, be they in universities or in government institutes, perpetuate themselves by getting more funding to do more research, which leads to getting more funding to do more research while keeping an army of post docs, grad students, research assistants and professors gainfully employed. It’s kinda like reproduction, only less fun! It is a good system and a lot of good work gets done, but for a lot of questions, the answers are already there.

Policy level decisions require that clear cut choices be made, while they are NOT zero sum games, there are winners and losers in most of the decisions, and this current incarnation of politicians do not seem to want to make these kinds of decisions unless the winners are big companies (energy, pharma, healthcare, etc), rich people (tax cuts, etc.) or war.