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Enhanced catalytic activity of electrodeposited Ni-Cu-P toward oxygen evolution reaction
Kim, Byung Keun,Kim, Soo-Kil,Cho, Sung Ki,Kim, Jae Jeong Elsevier 2018 Applied Catalysis B Vol.237 No.-
<P><B>Abstract</B></P> <P>The slow kinetics of the oxygen evolution reaction (OER) and the high cost of the precious metal catalysts for the OER limit the efficiency and cost-effectiveness of water splitting. In this study, we introduce electrodeposited nickel-copper-phosphorous (NiCuP) as an efficient OER electrocatalyst in alkaline medium. The addition of Cu into the NiP electrocatalyst significantly enhanced the OER activity. Optimization of the electrodeposition conditions revealed that Ni<SUB>59</SUB>Cu<SUB>19</SUB>P<SUB>9</SUB> in terms of atomic percent exhibited the best activity with a reduced Tafel slope and charge transfer resistance for the OER, compared to NiP. The Ni<SUB>59</SUB>Cu<SUB>19</SUB>P<SUB>9</SUB> catalyst successfully endured the OER operation at 10 mA/cm<SUP>2</SUP> for up to 30 h while maintaining a Faradaic efficiency of over 99%. The X-ray photoelectron spectroscopy showed that the amount of active Ni hydroxide (NiOOH) species increased with the addition of Cu, which likely contributed to the enhanced of catalytic activity.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A Ni-Cu-P electrocatalyst for the oxygen evolution reaction (OER) was prepared via electrodeposition. </LI> <LI> The addition of Cu into the NiP electrocatalyst enhanced the catalytic activity, and Ni59Cu19P9 exhibited the maximum OER performance. </LI> <LI> Ni59Cu19P9 required only 307 mV overpotential to deliver 10 mA/cm2 with a 42.5 mV/dec Tafel slope. </LI> <LI> The catalytic activity of Ni59Cu19P9 was sustained for 30 h with almost 100% Faradaic efficiency. </LI> <LI> The increase in the activity with Cu addition is likely associated with the increase in the amount of NiOOH in the NiCuP. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Electroless Nickel Plating on Fibers for the Highly Porous Electrode
Cheon, So-Young,Park, So-Yeon,Rhym, Young-Mok,Kim, Doo-Hyun,Koo, Yeon-Soo,Lee, Jae-Ho The Korean Electrochemical Society 2010 Journal of electrochemical science and technology Vol.1 No.2
Materials used as fuel cell electrode should be light, high conductive, high surface area for reaction, catalytic surface and uniformity of porous structure. Nickel is widely used in electrode materials because it itself has catalytic properties. When used as electrode materials, nickel of only a few im on the surface may be sufficient to conduct the catalytic role. To manufacture the nickel with porous structure, Electroless nickel plating on carbon fiber be conducted. Because electroless nickel plating is possible to do uniform coating on the surface of substrate with complex shape. Acidic bath and alkaline bathe were used in electroless nickel plating bath, and pH and temperature of bath were controlled. The rate of electroless plating in alkaline bath was faster than that in acidic bath. As increasing pH and temperature, the rate of electrolee plating was increased. The content of phosphorous in nickel deposit was higher in acidic bath than that in alkaline bath. As a result, the uniform nickel deposit on porous carbon fiber was conducted.
Kang, Han-Byul,Park, Jongwoo,Bae, Jee-Hwan,Yang, Cheol-Woong The Japan Institute of Metals 2010 MATERIALS TRANSACTIONS Vol.51 No.10
<P>This study examined the crystallization behavior of electroless Ni-P UBM with an medium phosphorous content (∼15 at%) induced by a single and step heat treatment using <I>in-situ</I> transmission electron microscopy (TEM). Different heat treatment processes affected the crystallization behavior of electroless Ni-P UBM. After single heat treatment at 300°C for 60 min, the electroless Ni-P UBM contained Ni and Ni<SUB>3</SUB>P. In addition to Ni and Ni<SUB>3</SUB>P, more complex Ni-P compounds, such as Ni<SUB>12</SUB>P<SUB>5</SUB> and Ni<SUB>5</SUB>P<SUB>2</SUB> formed in the electroless Ni-P UBM resulting from a step heat treatment at 150°C for 60 min followed by 300°C for 60 min.</P>
Gang, B.G.,Jung, W.,Kwon, S. Pergamon Press ; Elsevier Science Ltd 2016 International journal of hydrogen energy Vol.41 No.1
<P>In this research, a fuel cell system is operated for 30 min and then stopped for 30 min, followed by re-operation for another 30 min to examine its restart characteristics. In this way, potential hybrid power sources, such as solar cells, can be utilized during the inoperational mode of fuel cell systems. However, such operation shows that the concentration of sodium hydroxide in sodium borohydride solutions and the durability of Co-P/Ni foam catalysts play important roles in restarting the proton exchange membrane fuel cell after the 30-min break. Thus, this article describes the catalytic hydrolysis performance of NaBH4 solutions and the operation of PEM fuel cells to characterize the discontinuous mode of fuel cell systems. Moreover, the byproduct is removed from the byproduct storage while operating the fuel cell system, reducing the total system's weight. Copyright (C) 2015, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.</P>
Kuo, C.T.,Balamurugan, K.,Shiu, H.W.,Park, H.J.,Sinn, S.,Neumann, M.,Han, M.,Chang, Y.J.,Chen, C.H.,Kim, H.D.,Park, J.G.,Noh, T.W. Elsevier 2016 Current Applied Physics Vol.16 No.3
<P>We have studied the electronic structure and interfacial properties of mechanically exfoliated few-layer NiPS3 van der Waals crystals on ZnO/Nb:SrTiO3 substrates using scanning photoelectron microscopy and spectroscopy. The conducting ZnO layer enhances the visibility of few-layer NiPS3 on Nb:SrTiO3 and prevents charging effects in photoemission. We experimentally determined a type-II band alignment at the NiPS3/ZnO interface. The valence band offset (VBO) of few-layer NiPS3/ZnO is 2.8 +/- 0.09 eV, and the conduction band offset is 1.0 +/- 0.09 eV. Moreover, we found an increase of similar to 0.3 eV in VBO as decreasing NiPS3 thickness, suggesting electronic coupling or charge transfer at the NiPS3/ZnO interface. (C) 2016 Elsevier B.V. All rights reserved.</P>
Cheng-Tai Kuo,Karuppannan Balamurugan,Hung Wei Shiu,Hyun Ju Park,Soobin Sinn,Michael Neumann,한문섭,장영준,Chia-Hao Chen,Hyeong-Do Kim,박제근,Tae Won Noh 한국물리학회 2016 Current Applied Physics Vol.16 No.3
We have studied the electronic structure and interfacial properties of mechanically exfoliated few-layer NiPS3 van der Waals crystals on ZnO/Nb:SrTiO3 substrates using scanning photoelectron microscopy and spectroscopy. The conducting ZnO layer enhances the visibility of few-layer NiPS3 on Nb:SrTiO3 and prevents charging effects in photoemission. We experimentally determined a type-II band alignment at the NiPS3/ZnO interface. The valence band offset (VBO) of few-layer NiPS3/ZnO is 2.8 ± 0.09 eV, and the conduction band offset is 1.0 ± 0.09 eV. Moreover, we found an increase of ~0.3 eV in VBO as decreasing NiPS3 thickness, suggesting electronic coupling or charge transfer at the NiPS3/ZnO interface.