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October 15, 2014

VIP: Non-Invasive Probing of Nanoparticle Electrostatics

Dr. Kristina Tschulik, Dr. Wei Cheng, Dr. Christopher Batchelor-McAuley, Stuart Murphy, Dr. Dario Omanović and Prof. Dr. Richard G. Compton

Non-Invasive Probing of Nanoparticle ElectrostaticsNot what you might think: A new and non-invasive technique to probe the electrostatic interaction between surface-charged nanoparticles and a charged metal/solution interface shows that electrostatic effects are insignificant in all but very dilute electrolytes.

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  1. Oxygen Deficiency and Defect Chemistry in Delithiated Spinel LiNi0.5Mn1.5O4 Cathodes for Li-Ion Batteries

    Prof. Zhiguo Wang, Dr. Qiulei Su, Prof. Huiqiu Deng and Prof. Yongqing Fu

    Article first published online: 21 MAY 2015 | DOI: 10.1002/celc.201500059

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    Defective and delithiated but far from defeated: Oxygen deficiency and defect chemistry in delithiated spinel LiNi0.5Mn1.5O4 cathodes are investigated by using density functional theory. Results show that an oxygen deficiency assists the migration of transition metal ions from octahedral sites to tetrahedral ones, and the migration assists the formation of oxygen vacancies. Thus, an oxygen deficiency plays key roles in oxygen release in LiNi0.5Mn1.5O4 cathodes.

  2. In Situ Techniques to Study the Effects of Anode or Cathode Gas-Exchange Cycles on the Deterioration of Pt/C Cathode Catalysts in PEFCs

    Dr. Gabor Samjeské, Dr. Kotaro Higashi, Dr. Shinobu Takao, Dr. Shin-ichi Nagamatsu, Dr. Kensaku Nagasawa, Dr. Oki Sekizawa, Dr. Takuma Kaneko, Prof. Dr. Tomoya Uruga and Prof. Dr. Yasuhiro Iwasawa

    Article first published online: 20 MAY 2015 | DOI: 10.1002/celc.201500099

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    A quick exchange: PEFC start-up/shut-down operations degrade membrane electrode assembly (MEA) Pt/C cathode catalysts through carbon corrosion and nanoparticle detachment from the carbon support. The degradation of MEA Pt/C cathode catalysts is studied during start-up/shut-down processes caused by repeated quick anode gas-exchange and cathode gas-exchange treatments by means of in situ time-resolved XAFS, TEM, and electrochemical techniques.

  3. Tracking Non-Uniform Mesoscale Transport in LiFePO4 Agglomerates During Electrochemical Cycling

    Dr. Johanna Nelson Weker, Yiyang Li, Dr. Rengarajan Shanmugam, Prof. Wei Lai and Prof. William C. Chueh

    Article first published online: 15 MAY 2015 | DOI: 10.1002/celc.201500119

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    The way of the ion: Operando state-of-charge mapping of a LiFePO4 battery electrode with transmission X-ray microscopy shows inhomogeneous ionic transport within micron-sized agglomerates of nanoparticles (red=LiFePO4, green=FePO4). The Li-ion pathway appears to have no correlation to agglomerate size, suggesting that the nanoscale pore structure of agglomerates dominates the ion transport.

  4. Smart Hybrid Polymers for Advanced Damascene Electroplating: Combination of Superfill and Leveling Properties

    Dr. Nguyen Thi Minh Hai and Dr. Peter Broekmann

    Article first published online: 13 MAY 2015 | DOI: 10.1002/celc.201500104

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    Even more bang for your buck: Imep polymers (polymerizates of imidazole and epichlorohydrin) are demonstrated to have both superfill and leveling capabilities when combined with bis-(sodium-sulfopropyl)-disulfide. External stimuli like the current density can be used to switch the functionality of the Imep polymer from superfill to leveling mode (N-NDR=N-shaped negative differential resistance).

  5. Nitrogen-Doped Inverse Opal Carbons Derived from an Ionic Liquid Precursor for the Oxygen Reduction Reaction

    Dr. Shiguo Zhang, Hoi-Min Kwon, Zhe Li, Ai Ikoma, Prof. Kaoru Dokko and Prof. Masayoshi Watanabe

    Article first published online: 8 MAY 2015 | DOI: 10.1002/celc.201500129

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    Even better than the real thing: Using an ionic liquid as a single precursor, three-dimensionally macroporous nitrogen-doped carbons are fabricated via direct carbonization using a hard template based on opal silica colloidal crystals. The resulting highly porous nitrogen-doped carbons exhibit electrocatalytic activity towards oxygen reduction much higher than the furfuryl alcohol-derived carbon and close to the commercial Pt/C catalyst.

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