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Advanced energy materials: electrocatalytic oxygen reaction promoted by valence structure engineering regulated by industrial vitamin rare earth gadolinium

wallpapers News 2020-09-12

energy is an important material basis for economic growth social change of human society. At present most of the human dem for energy still comes from the development utilization of fossil fuels accompanied by a series of environmental problems. It is particularly important to improve energy utilization technology seek environmentally friendly safe excellent energy conversion storage devices. Zinc air battery has attracted wide attention due to its high energy density good safety green pollution-free. The key to promote the further development of zinc air battery is to explore study high efficiency oxygen catalyst.

rare earth metals have the reputation of "industrial gold" "industrial vitamin". Due to the unique 4f sublayer electronic structure strong oxygen affinity rare earth metals have a good application prospect in the electrocatalytic reaction involving oxygen. At present most of the researches on rare earth metal oxide based catalysts focus on ceria doping. However the poor electron conduction of ceria greatly limits the application of rare earth in the field of energy. Based on this Professor Tang Yawen of Nanjing Normal University cooperated with Professor Ma Tianyi of yanewcastle University Dr. Fu gengtao of UT Austin. Combined with DFT theoretical calculation actual reaction model the valence structure transformation interface charge regulation of Co catalyst regulated by rare earth element gadolinium (GD) were systematically studied so as to realize efficient catalytic oxygen reaction apply it to rechargeable zinc air battery. The

study was carried out on a N doped graphene aerogel (Gd2O3-Co/NG) by simple sol-gel method with Gd2O3-Co heterostructure particles. The experimental results show that the catalytic activity of Gd2O3 is improved significantly. Compared with the Co / ng without Gd the half wave potential of Gd2O3 Co / ng increases by 100 mV under alkaline test conditions the Tafel slope of Gd2O3 Co / ng is similar to that of commercial platinum carbon (Gd2O3 Co / ng: 59 MV dec-1 Pt / C: 60 mV dec-1); the current decay is only 5% under 40000 s long-term operation environment showing excellent stability. The theoretical study shows that the introduction of high valence Gd2O3 causes the charge redistribution at the Gd2O3 / CO interface which reduces the charge transfer resistance of the catalyst by 23 Ω produces more active sites which is conducive to promoting the electrocatalytic reaction. The electric double layer capacitance of Gd2O3 Co / ng catalyst is 21.5 mfcm-2 which is about 1.67 times of that of CO / ng catalyst. In addition DFT calculation also shows that the coupling between Gd2O3 CO is beneficial to balance ooh * OH * on the surface of Gd2O3 Co. When the catalyst was further applied to the rechargeable zinc air battery it showed high power density (114.3 mW cm − 2) energy density (892.7 wh kgzn-1) excellent long-range stability (the charge discharge voltage of the battery almost unchanged after 160 cycles). The results provide a new idea for the application of rare earth metals in the field of energy.

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