The electrochemical CO 2 reduction (ECDRR), as a key reaction in artificial photosynthesis to implement renewable energy conversion/storage, has been inhibited by the low efficiency and high costs of the electrocataly...
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The electrochemical CO 2 reduction (ECDRR), as a key reaction in artificial photosynthesis to implement renewable energy conversion/storage, has been inhibited by the low efficiency and high costs of the electrocatalysts. Herein, we synthesize a fluorine‐doped carbon (FC) catalyst by pyrolyzing commercial BP 2000 with a fluorine source, enabling a highly selective CO 2 ‐to‐CO conversion with a maximum Faradaic efficiency of 90 % at a low overpotential of 510 mV and a small Tafel slope of 81 mV dec −1 , outcompeting current metal‐free catalysts. Moreover, the higher partial current density of CO and lower partial current density of H 2 on FC relative to pristine carbon suggest an enhanced inherent activity towards ECDRR as well as a suppressed hydrogen evolution by fluorine doping. Fluorine doping activates the neighbor carbon atoms and facilitates the stabilization of the key intermediate COOH* on the fluorine‐doped carbon material, which are also blocked for competing hydrogen evolution, resulting in superior CO 2 ‐to‐CO conversion.
Correction for 'Vehicle-saving theranostic probes based on hydrophobic iron oxide nanoclusters using doxorubicin as a phase transfer agent for MRI and chemotherapy' by Yanbing Cao et al., Chem. Commun., 2019, ...
Correction for 'Vehicle-saving theranostic probes based on hydrophobic iron oxide nanoclusters using doxorubicin as a phase transfer agent for MRI and chemotherapy' by Yanbing Cao et al., Chem. Commun., 2019, DOI: .
Photo/electrochemical CO 2 splitting is impeded by the low cost‐effective catalysts for key reactions: CO 2 reduction (CDRR) and water oxidation. A porous silicon and nitrogen co‐doped carbon (SiNC) nanomaterial by ...
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Photo/electrochemical CO 2 splitting is impeded by the low cost‐effective catalysts for key reactions: CO 2 reduction (CDRR) and water oxidation. A porous silicon and nitrogen co‐doped carbon (SiNC) nanomaterial by a facile pyrolyzation was developed as a metal‐free bifunctional electrocatalyst. CO 2 ‐to‐CO and oxygen evolution (OER) partial current density under neutral conditions were enhanced by two orders of magnitude in the Tafel regime on SiNC relative to single‐doped comparisons beyond their specific area gap. The photovoltaic‐driven CO 2 splitting device with SiNC electrodes imitating photosynthesis yielded an overall solar‐to‐chemical efficiency of advanced 12.5 % (by multiplying energy efficiency of CO 2 splitting cell and photovoltaic device) at only 650 mV overpotential. Mechanism studies suggested the elastic electron structure of −Si(O)−C−N− unit in SiNC as the highly active site for CDRR and OER simultaneously by lowering the free energy of CDRR and OER intermediates adsorption.
The title complex, [Co2（bibzim）（H2bibzim）4]·Co2（H2bibzim）2（Hbibzim）（HL）]2- 2H2O （1） （HEbibzim = 2,2＇-bibenzimidazole, H5L = N,N-bis（phosphonomethyl）aminoacetic acid （HO2CCH2N（CH2PO3H2）2））, wa...
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The title complex, [Co2（bibzim）（H2bibzim）4]·Co2（H2bibzim）2（Hbibzim）（HL）]2- 2H2O （1） （HEbibzim = 2,2＇-bibenzimidazole, H5L = N,N-bis（phosphonomethyl）aminoacetic acid （HO2CCH2N（CH2PO3H2）2））, was synthesized with hydrothermal reactions. The compound crystallizes in triclinic, space group P1 with a = 13.71020（10）, b = 14.9165（5）, c = 20.9924（5） A, a = 86.344（9）, β = 71.214（8）, γ = 73.757（7）°, C162HI24Co6N46O18P4, Mr = 3478.52, V = 3900.55（16） A3, Z = 2, Dc = 1.482 g/cm3,μ（MoKa） = 0.747 mm^-1, F（000） = 1784, the final R = 0.0777 and wR = 0.2091 for 13598 observed reflections （I 〉 2σ（I））. X-ray diffraction analysis reveals that there are three crystallographically independent Co（II） atoms in the complex. The complex consists of binuclear coordination cation, binuclear coordination anion, as well as lattice water molecules, which further aggregate into a 3D framework via hydrogen bonding as well as π-π interactions.
Thermoelectric （TE） materials can convert directly low-grade heat energy to electricity, and vice versa, which is highly expected to play an important role in the future energy management. The application practice d...
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Thermoelectric （TE） materials can convert directly low-grade heat energy to electricity, and vice versa, which is highly expected to play an important role in the future energy management. The application practice demands efficient TE materials made of non-toxic and inexpensive components. Herein, we report a Ni substituted polycrystalline n-type bulk material ***3 （x = 0-0.1）. Based on density functional theory calculation, Ni tends to substitute at the In3 site in the In4Se3, which causes a monotonous unit cell volume reduction. At x=0.01, Ni substitution results in a sharp decrease in the carder concentration （he） in comparison with that of pure In4Se3, and then ne increases with the increase of Ni concentration. Ni substitution leads to a performance enhancement from 0.6 for pure In4Se3 to an optimum ZTvalue of 0.8 at 450℃.
Introduction:Rare earth Elementes(REEs)have attracted attention in many *** them,use of scandium(Sc)has continued to increase in many application *** and extraction of Sc has been attracted *** solid phase
Introduction:Rare earth Elementes(REEs)have attracted attention in many *** them,use of scandium(Sc)has continued to increase in many application *** and extraction of Sc has been attracted *** solid phase
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