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Carbon nanofiber/nanotube (CNF/CNT) composite catalysts grown on carbon felt (CF), prepared from a simple way involving the thermal decomposition of acetylene gas over Ni catalysts, are studied as electrode materials in a vanadium redox flow battery. The electrode with the composite catalyst prepared at 700 °C (denoted as CNF/CNT-700) demonstrates the best(More)
A composite air electrode consisting of Ketjenblack carbon (KB) supported amorphous manganese oxide (MnOx) nanowires, synthesized via a polyol method, is highly efficient for the oxygen reduction reaction (ORR) in a Zn-air battery. The low-cost and highly conductive KB in this composite electrode overcomes the limitations due to low electrical conductivity(More)
The analysis methods described to date for (14)N electron spin echo envelope modulation (ESEEM) mostly deal with isotropic g- and (14)N hyperfine coupling tensors. However, many cases of rhombic tensors are encountered. In the present report we present general equations for analyzing orientation-selective ESEEM and illustrate their use. (i) We present(More)
Freeze-quenching of nitrogenase during reduction of carbon disulfide (CS(2)) was previously shown to result in the appearance of a novel EPR signal (g = 2.21, 1.99, and 1.97) not previously associated with any of the oxidation states of the nitrogenase metal clusters. In the present work, freeze-quench X- and Q-band EPR and Q-band (13)C electron nuclear(More)
Wild-type nitrogenase MoFe protein shows a deep 14N electron spin-echo envelope modulation (ESEEM) arising from a nitrogen nucleus (N1) coupled to the S = 3/2 spin system of the FeMo-cofactor of the MoFe protein. A previous ESEEM study on altered MoFe proteins generated by substitutions at the alpha-195-histidine position suggested that alpha-195-histidine(More)
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