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Lee, Minoh,Jeon, Hyo Sang,Lee, Si Young,Kim, Haeri,Sim, Sang Jun,Hwang, Yun Jeong,Min, Byoung Koun Royal Society of Chemistry 2017 Journal of Materials Chemistry A Vol.5 No.36
<▼1><P>The chemical composition change of Ni and Fe on a cratered stainless steel surface as a result of electrochemical oxidation leads to significantly enhanced water oxidation properties in a neutral electrolyte.</P></▼1><▼2><P>An electron-mediated CO2-to-chemical conversion system is regarded as one of the effective solutions for the depletion of fossil fuels and the accumulation of atmospheric CO2. In this process, the protons and electrons generated from the water-oxidation reaction at an anode are used during the reduction of CO2 at a cathode, in order to produce high-value hydrocarbon chemicals. Therefore, water oxidation is also a key reaction for the overall electron-mediated CO2-to-chemical conversion. In this work, a facile preparation method is developed for a highly efficient water oxidation electrocatalyst which stably operates in a neutral bicarbonate electrolyte optimized for CO2-reduction conditions. Ni-rich cratered structures were spontaneously formed on the stainless steel surface by harsh electro-oxidation, and the chemical composition changes of Fe and Ni on the catalyst surface dramatically enhance water-oxidation activity showing an overpotential value of 504 mV at 10 mA cm<SUP>−2</SUP> in a CO2-saturated bicarbonate electrolyte. In contrast to a severe degradation in the phosphate electrolyte, the cratered stainless-steel (CSS) catalyst is very stable for an 18 h reaction in the bicarbonate electrolyte. Surface spectroscopic analyses of CSS consistently revealed that the active-surface structure of the NiOOH and adsorbed water molecules is remarkably stable throughout water-oxidation in the neutral bicarbonate electrolyte, while the destruction of Ni structures by the phosphate electrolyte is proposed to cause concomitant activity loss for water oxidation.</P></▼2>
Graphene oxide assisted spontaneous growth of V2O5 nanowires at room temperature.
Lee, Minoh,Hong, Won G,Jeong, Hu Young,Balasingam, Suresh Kannan,Lee, Zonghoon,Chang, Sung-Jin,Kim, Byung Hoon,Jun, Yongseok RSC Pub 2014 Nanoscale Vol.6 No.19
<P>Graphene-decorated single crystalline V2O5 nanowires (G-VONs) have been synthesized by mixing graphene oxide (GO) and V2O5 suspensions at room temperature. In this process, V2O5 nanowires (VONs) are formed spontaneously from commercial V2O5 particles with the aid of GO. The as-formed one dimensional G-VONs were characterized by using a X-ray diffractometer, a X-ray photoelectron spectrometer, a scanning electron microscope, and a transmission electron microscope. GO plays a vital role in the VON formation with the simultaneous reduction of GO. A single G-VON showed superior electrical conductivity compared with that of the pure VONs obtained from the sol-gel method. This could be ascribed to the insertion of rGO sheets into the V2O5 layered structure, which was further confirmed by electron energy loss spectroscopy.</P>
Freeze-dried MoS<sub>2</sub> sponge electrodes for enhanced electrochemical energy storage
Balasingam, Suresh Kannan,Lee, Minoh,Kim, Byung Hoon,Lee, Jae Sung,Jun, Yongseok The Royal Society of Chemistry 2017 Dalton Transactions Vol.46 No.7
<▼1><P>High surface area MoS2 sponge electrodes were synthesized <I>via</I> a facile hydrothermal method followed by a freeze drying process and showed high specific capacitance and better charge storage behavior.</P></▼1><▼2><P>In the present study, we have synthesized high surface area MoS2 sponge electrodes <I>via</I> a facile hydrothermal method followed by a freeze drying process. The performance of the MoS2 based symmetric capacitor showed a high specific capacitance value of around 128 F g<SUP>−1</SUP> at a scan rate of 2 mV s<SUP>−1</SUP>, and also a single electrode showed a specific capacitance of 510 F g<SUP>−1</SUP>, which is a remarkable value to be reported for a MoS2 based material in a symmetric device configuration. Also, a high energy density of around 6.15 Wh kg<SUP>−1</SUP> and a good cyclic stability over 4000 cycles are obtained for the symmetrical cell.</P></▼2>