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About: Hydrogen is a(n) research topic. Over the lifetime, 132288 publication(s) have been published within this topic receiving 2526174 citation(s). The topic is also known as: element 1 & H. more


Journal ArticleDOI: 10.1038/NMAT2317
Xinchen Wang1, Kazuhiko Maeda2, Arne Thomas1, Kazuhiro Takanabe2  +4 moreInstitutions (2)
01 Jan 2009-Nature Materials
Abstract: The production of hydrogen from water using a catalyst and solar energy is an ideal future energy source, independent of fossil reserves. For an economical use of water and solar energy, catalysts that are sufficiently efficient, stable, inexpensive and capable of harvesting light are required. Here, we show that an abundant material, polymeric carbon nitride, can produce hydrogen from water under visible-light irradiation in the presence of a sacrificial donor. Contrary to other conducting polymer semiconductors, carbon nitride is chemically and thermally stable and does not rely on complicated device manufacturing. The results represent an important first step towards photosynthesis in general where artificial conjugated polymer semiconductors can be used as energy transducers. more

Topics: Energy source (59%), Photocatalytic water splitting (56%), Hydrogen production (56%) more

7,884 Citations

Journal ArticleDOI: 10.1103/PHYSREVB.29.6443
Murray S. Daw1, Michael I. Baskes1Institutions (1)
15 Jun 1984-Physical Review B
Abstract: We develop the embedded-atom method [Phys. Rev. Lett. 50, 1285 (1983)], based on density-functional theory, as a new means of calculating ground-state properties of realistic metal systems. We derive an expression for the total energy of a metal using the embedding energy from which we obtain several ground-state properties, such as the lattice constant, elastic constants, sublimation energy, and vacancy-formation energy. We obtain the embedding energy and accompanying pair potentials semiempirically for Ni and Pd, and use these to treat several problems: surface energy and relaxation of the (100), (110), and (111) faces; properties of H in bulk metal (H migration, binding of H to vacancies, and lattice expansion in the hydride phase); binding site and adsorption energy of hydrogen on (100), (110), and (111) surfaces; and lastly, fracture of Ni and the effects of hydrogen on the fracture. We emphasize problems with hydrogen and with surfaces because none of these can be treated with pair potentials. The agreement with experiment, the applicability to practical problems, and the simplicity of the technique make it an effective tool for atomistic studies of defects in metals. more

Topics: Surface energy (57%), Embedded atom model (55%), Bond order potential (53%) more

5,395 Citations

Journal ArticleDOI: 10.1039/B802256A
Abstract: New materials capable of storing hydrogen at high gravimetric and volumetric densities are required if hydrogen is to be widely employed as a clean alternative to hydrocarbon fuels in cars and other mobile applications. With exceptionally high surface areas and chemically-tunable structures, microporous metal–organic frameworks have recently emerged as some of the most promising candidate materials. In this critical review we provide an overview of the current status of hydrogen storage within such compounds. Particular emphasis is given to the relationships between structural features and the enthalpy of hydrogen adsorption, spectroscopic methods for probing framework–H2 interactions, and strategies for improving storage capacity (188 references). more

Topics: Hydrogen storage (60%), Hydrogen (51%)

4,278 Citations

Journal ArticleDOI: 10.1126/SCIENCE.1083440
16 May 2003-Science
Abstract: Metal-organic framework-5 (MOF-5) of composition Zn4O(BDC)3 (BDC = 1,4-benzenedicarboxylate) with a cubic three-dimensional extended porous structure adsorbed hydrogen up to 4.5 weight percent (17.2 hydrogen molecules per formula unit) at 78 kelvin and 1.0 weight percent at room temperature and pressure of 20 bar. Inelastic neutron scattering spectroscopy of the rotational transitions of the adsorbed hydrogen molecules indicates the presence of two well-defined binding sites (termed I and II), which we associate with hydrogen binding to zinc and the BDC linker, respectively. Preliminary studies on topologically similar isoreticular metal-organic framework-6 and -8 (IRMOF-6 and -8) having cyclobutylbenzene and naphthalene linkers, respectively, gave approximately double and quadruple (2.0 weight percent) the uptake found for MOF-5 at room temperature and 10 bar. more

Topics: Hydrogen storage (55%), Hydrogen (54%), Metal-organic framework (51%) more

3,984 Citations

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Topic's top 5 most impactful authors

Ted B. Flanagan

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Ibrahim Dincer

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Stephen J. Pearton

70 papers, 2.7K citations

Yoshitsugu Kojima

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Shin Ichi Orimo

63 papers, 2.4K citations

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