Northeastern University (China)

About: Northeastern University (China) is a education organization based out in Shenyang, China. It is known for research contribution in the topics: Microstructure & Control theory. The organization has 36087 authors who have published 36125 publications receiving 426807 citations. The organization is also known as: Dōngběi Dàxué & Northeastern University (东北大学).

Development and progress on hydrogen metallurgy

Abstract: Hydrogen metallurgy is a technology that applies hydrogen instead of carbon as a reduction agent to reduce CO2 emission, and the use of hydrogen is beneficial to promoting the sustainable development of the steel industry. Hydrogen metallurgy has numerous applications, such as H2 reduction ironmaking in Japan, ULCORED and hydrogen-based steelmaking in Europe; hydrogen flash ironmaking technology in the US; HYBRIT in the Nordics; Midrex H2™ by Midrex Technologies, Inc. (United States); H2FUTURE by Voestalpine (Austria); and SAL-COS by Salzgitter AG (Germany). Hydrogen-rich blast furnaces (BFs) with COG injection are common in China. Running BFs have been industrially tested by AnSteel, XuSteel, and BenSteel. In a currently under construction pilot plant of a coal gasification-gas-based shaft furnace with an annual output of 10000 t direct reduction iron (DRI), a reducing gas composed of 57vol% H2 and 38vol% CO is prepared via the Ende method. The life cycle of the coal gasification—gas-based shaft furnace—electric furnace short process (30wt% DRI + 70wt% scrap) is assessed with 1 t of molten steel as a functional unit. This plant has a total energy consumption per ton of steel of 263.67 kg standard coal and a CO2 emission per ton of steel of 829.89 kg, which are superior to those of a traditional BF converter process. Considering domestic materials and fuels, hydrogen production and storage, and hydrogen reduction characteristics, we believe that a hydrogen-rich shaft furnace will be suitable in China. Hydrogen production and storage with an economic and large-scale industrialization will promote the further development of a full hydrogen shaft furnace.

Core–Shell In2O3/ZnO Nanoarray Nanogenerator as a Self-Powered Active Gas Sensor with High H2S Sensitivity and Selectivity at Room Temperature

Abstract: Self-powered active gas sensing has been realized from core–shell In2O3/ZnO nanoarray nanogenerator, and extremely high H2S sensitivity and selectivity at room temperature have been obtained. In2O3/ZnO nanoarrays have two functions: one is an energy source because In2O3/ZnO nanoarrays can produce piezoelectric output power; the other is a H2S sensor because the piezoelectric output of In2O3/ZnO nanoarrays varies with the concentration of H2S. Upon exposure to 700 ppm of H2S at room temperature, the piezoelectric output of In2O3/ZnO nanoarrays decreases from 0.902 V (in air) to 0.088 V, and the sensitivity is up to 925, much higher than that of bare ZnO nanoarrays. The heterostructure conversion of In2O3/ZnO to In2S3/ZnO, in which the electron depletion layer on the surface of ZnO changes to the accumulation layer, has stronger adjustment on the free-carrier piezo-screening effect of ZnO than the gas adsorption. Our results demonstrate that a heterostructured nanoarray nanogenerator has potential applicati...