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      Three-dimensional NiFe layered double hydroxide film for high-efficiency oxygen evolution reaction

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          Abstract

          A 3D architecture of NiFe-LDH has been found to be very active for electrochemical oxygen evolution reaction.

          Fabricating active materials into specific macrostructures is critical in the pursuit of high electro-catalytic activity. Herein we demonstrate that a three-dimensional (3D) architecture of NiFe layered double hydroxide (NiFe-LDH) significantly reduced the onset potential, yielded high current density at small overpotentials, and showed outstanding stability in electrochemical oxygen evolution reaction.

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          A perovskite oxide optimized for oxygen evolution catalysis from molecular orbital principles.

          Jin Suntivich, Kevin May, Hubert Gasteiger … (2011)
          The efficiency of many energy storage technologies, such as rechargeable metal-air batteries and hydrogen production from water splitting, is limited by the slow kinetics of the oxygen evolution reaction (OER). We found that Ba(0.5)Sr(0.5)Co(0.8)Fe(0.2)O(3-δ) (BSCF) catalyzes the OER with intrinsic activity that is at least an order of magnitude higher than that of the state-of-the-art iridium oxide catalyst in alkaline media. The high activity of BSCF was predicted from a design principle established by systematic examination of more than 10 transition metal oxides, which showed that the intrinsic OER activity exhibits a volcano-shaped dependence on the occupancy of the 3d electron with an e(g) symmetry of surface transition metal cations in an oxide. The peak OER activity was predicted to be at an e(g) occupancy close to unity, with high covalency of transition metal-oxygen bonds.
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            High-performance lithium battery anodes using silicon nanowires.

            Candace K Chan, Hailin Peng, Gao Liu … (2008)
            There is great interest in developing rechargeable lithium batteries with higher energy capacity and longer cycle life for applications in portable electronic devices, electric vehicles and implantable medical devices. Silicon is an attractive anode material for lithium batteries because it has a low discharge potential and the highest known theoretical charge capacity (4,200 mAh g(-1); ref. 2). Although this is more than ten times higher than existing graphite anodes and much larger than various nitride and oxide materials, silicon anodes have limited applications because silicon's volume changes by 400% upon insertion and extraction of lithium which results in pulverization and capacity fading. Here, we show that silicon nanowire battery electrodes circumvent these issues as they can accommodate large strain without pulverization, provide good electronic contact and conduction, and display short lithium insertion distances. We achieved the theoretical charge capacity for silicon anodes and maintained a discharge capacity close to 75% of this maximum, with little fading during cycling.
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              An advanced Ni-Fe layered double hydroxide electrocatalyst for water oxidation.

              Ming Gong, Yanguang Li, Hailiang Wang … (2013)
              Highly active, durable, and cost-effective electrocatalysts for water oxidation to evolve oxygen gas hold a key to a range of renewable energy solutions, including water-splitting and rechargeable metal-air batteries. Here, we report the synthesis of ultrathin nickel-iron layered double hydroxide (NiFe-LDH) nanoplates on mildly oxidized multiwalled carbon nanotubes (CNTs). Incorporation of Fe into the nickel hydroxide induced the formation of NiFe-LDH. The crystalline NiFe-LDH phase in nanoplate form is found to be highly active for oxygen evolution reaction in alkaline solutions. For NiFe-LDH grown on a network of CNTs, the resulting NiFe-LDH/CNT complex exhibits higher electrocatalytic activity and stability for oxygen evolution than commercial precious metal Ir catalysts.
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                Author and article information

                Journal
                Journal ID (publisher-id): CHCOFS
                Title: Chem. Commun.
                Abbreviated Title: Chem. Commun.
                Publisher: Royal Society of Chemistry (RSC)
                ISSN (Print): 1359-7345
                ISSN (Electronic): 1364-548X
                Publication date Created: 2014
                Publication date (Print): 2014
                Volume: 50
                Issue: 49
                Pages: 6479-6482
                Article
                DOI: 10.1039/C4CC01625D
                PubMed ID: 24817324
                SO-VID: bad2482a-6aea-48e1-831b-760ae6bf72f5
                Copyright © © 2014
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