Topic
Nickel
About: Nickel is a research topic. Over the lifetime, 79308 publications have been published within this topic receiving 1210058 citations. The topic is also known as: Ni & element 28.
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292 citations
TL;DR: In this paper, the dependence of the resistivities of nickel and nickel zinc ferrites prepared from high purity reagents upon composition and firing temperature has been studied, and it has been determined that iron deficient nickel zinc and ferrites are of much higher resistivity than iron deficient zinc or nickel ferrites, and that the effect of excess iron upon resistivity is dependent upon the presence or absence of zinc at temperatures below 1300°C.
Abstract: The dependence of the resistivities of nickel and nickel zinc ferrites prepared from high purity reagents upon composition and firing temperature has been studied.It has been determined that iron deficient nickel zinc ferrites are of much higher resistivity than iron deficient nickel or zinc ferrites.The iron deficient ferrites prepared, which were fired in oxygen below 1300°C and have Ni:Zn ratios greater than 3:7, show a positive thermoelectric voltage. Other compositions or materials fired above 1300°C have a negative thermoelectric voltage.The effect of excess iron upon resistivity is dependent upon the presence or absence of zinc at temperatures below 1300°C.
291 citations
291 citations
TL;DR: In this article, several supported nickel catalysts were tested for the methane reforming reaction at 700°C and the initial activity depended essentially on the state of the nickel phase (reduction and dispersion) and little on its environment (support, additive).
290 citations
TL;DR: In this article, a new anode with nanostructured barium oxide/nickel (BaO/Ni) interfaces for low-cost solid oxide fuel cells (SOFCs) was proposed.
Abstract: The existing Ni-yttria-stabilized zirconia anodes in solid oxide fuel cells (SOFCs) perform poorly in carbon-containing fuels because of coking and deactivation at desired operating temperatures. Here we report a new anode with nanostructured barium oxide/nickel (BaO/Ni) interfaces for low-cost SOFCs, demonstrating high power density and stability in C(3)H(8), CO and gasified carbon fuels at 750°C. Synchrotron-based X-ray analyses and microscopy reveal that nanosized BaO islands grow on the Ni surface, creating numerous nanostructured BaO/Ni interfaces that readily adsorb water and facilitate water-mediated carbon removal reactions. Density functional theory calculations predict that the dissociated OH from H(2)O on BaO reacts with C on Ni near the BaO/Ni interface to produce CO and H species, which are then electrochemically oxidized at the triple-phase boundaries of the anode. This anode offers potential for ushering in a new generation of SOFCs for efficient, low-emission conversion of readily available fuels to electricity.
290 citations