Posts Tagged ‘PBS’
some more on hydrogen and fuel cells
an electrolyser facility somewhere in the world, methinks
Canto: Our recent post on democracy and public broadcasting has made me turn to PBS, in order to be more democratic, and I watched a piece from their News Hour on clean hydrogen. Being always in need of scientific education, I’ve made this yet another starting point for my understanding of how hydrogen works as an energy source, what fuel cells are, and perhaps also about why so many people are so skeptical about its viability.
Jacinta: Fuel cells are the essential components of hydrogen vehicles, just as batteries are for electric vehicles, and infernal combustion engines are for the evil vehicles clogging the roads of today, right?
Canto: Yes, and Jack Brouwer, of the National Fuel Cell Research Centre in California, claims that fuel cells can be designed to be just as fast as battery engine. Now according to the brief, illustrated explanation, diatomic hydrogen molecules enter the fuel cell (hydrogen occurs naturally in diatomic form, as does oxygen). As Miles O’Brien, the reporter, puts it: ‘A fuel cell generates electricity by relying on the natural attraction between hydrogen and oxygen molecules. Inside the cell, a membrane allows positive hydrogen particles [basically protons] to pass through to oxygen supplied from ambient air. The negative particles [electrons] are split off and sent on a detour, creating a flow of electrons – electricity to power the motor. After their work is done, all those particles reunite to make water, which is the only tailpipe emission on these vehicles.’
Jacinta: He tells us that the oxygen is supplied by ambient air, but where does the hydrogen come from? No free hydrogen. That’s presumably where electrolysis comes in. Also, membranes allows protons to pass but not electrons? Shouldn’t that be the other way round? Electrons are much tinier than protons.
Canto: Very smart. Maybe we’ll get to that. Brouwer talks of the benefits of fuel cells, saying ‘you can go farther’, whatever that means. Presumably, going farther with less fuel, or rather, you can have a lot of fuel on board, because hydrogen’s the lightest element in the universe. Clearly, it’s not so simple. O’Brien then takes us on a brief history of hydrogen fuel, starting with the conception back in 1839, and real-world application in the sixties for the Apollo missions. The Bush administration pledged a billion dollars for the development of hydrogen fuel cell cars in the 2000s, but – here’s the problem – they were producing hydrogen from methane, that infamous greenhouse gas. Ultimately the cars would be emission free and great for our cities and their currently dirty air, but the hydrogen production would be a problem unless they could find new clean methods. And that’s of course where electrolysis comes in – powered by green electricity.
Jacinta: The splitting of water molecules, a process I still haven’t quite got my head around….
Canto: Well the PBS segment next focuses on the sectors in which, according to Brouwer, hydrogen fuel will make a difference, namely air transport and shipping. Rail and heavy vehicle transport too – where the lightness of hydrogen will make it the go-to fuel. It’s energy-dense but it must be compressed or liquefied for distribution. This makes the distribution element a lot more expensive than it is for petrol. So naturally Brouwer and others are looking at economies of scale – infrastructure. The more of these compressors you have, the more places you have them in, the cheaper it will all be, presumably.
Jacinta: Right, as presumably happened with wind turbines and solar panels, and the more people working on them, the more people coming up with improvements… But how do they liquefy hydrogen?
Canto: Hmmm, time for some further research. You have to cool it to horribly low temps (lower than −253°C), and it’s horribly expensive. There was a bipartisan infrastructure bill passed recently which will fund the building of hydrogen distribution hubs around the USA through their Department of Energy. That’s where the action will be. The plan, according to mechanical engineer Keith Wipke of the National Renewable Energy Laboratory, is to do in ten years what it took solar and wind 3 or 4 decades to achieve. That is, to bring hydrogen production costs right down. He’s talking $1 per kilogram.
Jacinta: Okay, remember that in 2032.
Canto: Yeah, I won’t. They’re talking about improving every aspect of the process of course, including electrolysers, a big focus, as we’ve already reported. They’re connecting these electrolysers with renewable energy from wind and solar, and, in the bonobo-science world of caring and sharing, any new breakthroughs will quickly become globalised.
Jacinta: Yeah, and Mr Pudding will win the Nobel Peace Prize…
References
Could hydrogen be the clean fuel of the future? (PBS News Hour video)
green hydrogen? it has its place, apparently
US democracy: another problem
Please Be Sensible, and fund public broadcasting properly
Jacinta: So we’ve long been wondering why things are so bad in the USA, why so many people believe such rubbish, and even act on it, to the detriment, it seems, of their democratic system. We’ve talked about their jingoism and their religiosity, but there’s so much more to it. For example, there’s a movement of the religious Right, the supposedly Christian Right, which seems to have nothing whatever to do with the supposed teachings of Jesus…
Canto: Or his example, since he clearly wasn’t much of a family man. Actually much of Jesus’s behaviour and speakings were contradictory, certainly nothing you could build a coherent moral framework from.
Jacinta: Yes the Christian Right is all about ‘old-fashioned family values’, men who are men, women who know their place, the corruption that is homosexuality, feminism and the pro-abortion crowd. And this stuff is prevalent in Australia too, but with nowhere near the force and noise. And the same goes for the conspiracy theories, the misinformation, the libertarian, anti-government breast-beating and so forth. In the USA it has threatened, very seriously, to bring down their democracy, which is clearly still under serious threat. But something I heard today on the SGU podcast (The Skeptics’ Guide to the Universe episode 875) has helped me understand why so many United Staters are so loopy. Their public media outlets – as opposed to private media – have nothing like the presence that Australia’s ABC and Britain’s BBC have. Kara Santamaria, the SGU’s resident (but not token) female, presented research on this. Government-funded media (not of the Putinland or CCP kind of course) can be seen as ‘funding democracy’. The research comes from the Annenberg School for Communication at the University of Pennsylvania, presented in a paper called ‘Funding Democracy: Public Media and Democratic Health in 33 Countries’. It’s behind a paywall, but the link is below, for anyone who ever reads this, haha. I’m basing my comments on an article about the research, published on the Annenberg website – and on Santamaria’s commentary.
Canto: My turn. From the abstract of the research article we get this conclusion:
Correlations and cluster analyses show that high levels of secure funding for public media systems and strong structural protections for the political and economic independence of those systems are consistently and positively correlated with healthy democracies.
In terms of its public media funding, [the USA] is almost literally off the chart for how little it allocates towards its public media compared to other democracies around the planet. It comes out to .002 percent of Gross Domestic Product (GDP). At $465 million dollars, 2020 federal funding of U.S. public media amounted to just $1.40 per capita. Meanwhile, countries such as the UK, Norway, and Sweden spend close to $100 or more per capita toward their public media.
Since the market is no longer supporting the level of news media — especially local journalism — that democracy requires, there is arguably now an even stronger case to make that public media needs to step into the vacuum to address the widening news gaps as the commercial newspaper industry continues to wither away. News deserts are expanding across the country and around the world. This should be public media’s moment – an opportunity to revisit its core purpose and assess how it should operate within a democratic society and within an increasingly digital media system. Ideally, we would both restructure and democratize our public media system as we expand this critical infrastructure.
References
https://www.theskepticsguide.org/podcasts
https://www.asc.upenn.edu/news-events/news/public-media-can-improve-our-flawed-democracy
https://journals.sagepub.com/doi/abs/10.1177/19401612211060255
https://en.wikipedia.org/wiki/Democracy_Index