Solar cell concept used to enhance nuclear battery

Researchers in South Korea and the US have borrowed a strategy traditionally used in photovoltaic devices to enhance a battery concept that generates an electric current from beta particles. The team behind the work say it is a step towards making long-lasting batteries for very small devices. Betavoltaic cells use a radioactive isotope, in this case carbon-14, to generate beta radiation. Ordinarily such devices contain a semiconductor that absorbs the radiation to generate electrons. Now, a team led by Su-Il In from the Daegu Gyeongbuk Institute of Science and Technology has replaced the semiconductor with a titanium dioxide electrode coated with a ruthenium-based dye. The cell reported by In’s team uses a beta-emitting carbon-14 quantum dot layer on the counter electrode, and uses a dye-coated electrode as the anode. Dye coatings, also known as dye sensitisation, often feature in photovoltaic cells. In the presence of light, the dye absorbs approaching photons and generates electrons in response. Source: © Su-il In/DGISTThe dual role played by the carbon, as counter electrode material and radioactive source, simplifies the device architecture In the new betavoltaic cell, energy provided by beta radiation causes charge transfer from the dye’s ruthenium metal ions to its ligand, and that leads to electron-transfer to the titanium dioxide anode. ‘I think that merging old and new technology to solve the problems with beta batteries will be useful for our future,’ says In. The dye-sensitised device performed much better than the device without any dye – its power density was around 32,000 times greater. Additionally, In says using a dye ‘instead of an expensive and complicated process using a semiconductor,’ reduces the manufacturing cost by roughly 30%. ‘The dual role of the carbon-14 quantum dot layer as both the radioactive excitation source and the counter electrode is particularly innovative’, comments Yana Vaynzof, an expert in photovoltaic cell technology from the Technical University of Dresden, Germany. Vaynzof adds that ‘significant hurdles remain to be overcome, both in increasing the efficiency of the device and equally importantly, its stability.’ The cell’s efficiency is currently 0.48%, which is not yet high enough for widespread commercialisation. In’s team aim to improve the efficiency of the dye-sensitised betavoltaic cell in their future research, and In says the technology could ultimately be used to construct self-sustaining battery cells that require little to no charging.ReferencesY Hwang et al, Chem. Commun., 2020, 56, 7080 (DOI: 10.1039/d0cc02046j) Related articlesResearchPerovskite photovoltaics get their groove on2019-05-22T09:27:00ZClever structure boosts efficiency and cuts production costsResearchPhoto-rechargeable zinc-ion devices merge solar cell and battery tech2020-07-09T13:34:00ZA low cost and stable battery that can recharge itself in sunlight could help make energy more accessible in developing rural areasResearchEnergy harvesting device runs on shadows2020-05-04T13:43:00ZStudy endorses shadows as an untapped source of renewable energy More NewsBusinessCovid-19 vaccine deals risk skewing supply2020-09-25T08:27:00ZInternational accords including Covax aiming to ensure equitable distribution to poorer countriesResearchCarbon bond formation reproducibility runs into reagent stability problem2020-09-24T08:30:00ZSolid sodium alkoxides react with carbon dioxide and can hamper performance – but sometimes improve itResearchBaird’s rule of aromaticity extended to all-metal systems2020-09-23T09:18:00ZAromaticity concept can help scientists understand the properties of metal clusters SubscribeAdvertiseTopicsIssuesContributors Our mission News and events Campaigns Awards and funding Global challenges Support our work © Royal Society of Chemistry Registered charity number: 207890 Site powered by Webvision Cloud