Copyright © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
The following papers were judged to be very important by the referees. They will be published as soon as possible.
Three-Dimensional Structural Engineering for Energy-Storage Devices: From Microscope to Macroscope
Jing Xu, Xianfu Wang, Xiaowei Wang, Di Chen,* Xiaoyuan Chen, Dongdong Li* and Guozhen Shen*
As typical energy-storage devices (ESDs), supercapacitors and Li-ion batteries have attained great research attention for their excellent electrochemical energy-storage performance and low cost. This article aims to review the recent achievements in these ESDs from three aspects: 3D active materials, 3D current collectors, and 3D device integrations, along the line of microscope to macroscope. The structural engineering in each section is categorized and summarized based on the results in the literature, shedding light on the importance of advanced architecture. In addition, some possible research trends about ESD configurations and an optimistic outlook are also proposed.
Organic Nanoparticles: Mechanism of Electron Transfer to Indigo Nanoparticles
Richard Compton, Wei Cheng, Christopher Batchelor-McAuley
The mechanism of the reductive dissolution of nanoparticles made of indigo is studied by using the ‘nano-Impacts’ method. Here the nanoparticles move with random Brownian motion in solution and occasionally encounter a microelectrode held at a reducing potential, which transforms indigo to soluble leuco-indigo via the addition of two electrons and two protons. Analysis of the potential dependence of the transient currents flowing during the impacts shows that the rate-determining step is the addition of the first electron, and that protonation, the second electron transfer, and detachment of the molecules from the nanoparticles all occur after this slow step.
Received November 27, 2013, published online January 21, 2014, DOI: 10.1002/celc.201300233 – read now.
A Scanning Photoelectron Microscopy Study of Pt/Phosphoric-Acid-Imbibed Membrane Interface under Polarization
Won Hui Doh, Luca Gregoratti, Matteo Amati, Spyridon Zafeiratos, Yeuk T. Law, Stylianos G. Neophytides, Alin Orfanidi, Maya Kiskinova, and Elena R. Savinova*
Proton exchange membrane fuel cells (PEMFCs) are considered as one of the most promising, environmentally friendly technologies for decentralized energy production. This work gives the first example of the application of scanning photoelectron microscopy (SPEM) to an in situ study of a model membrane electrode assembly of a high-temperature PEMFC. The potential of SPEM to simultaneously probe the morphology, surface composition, and chemical state of cell constituents is revealed by providing essential information about the relevant fuel cell processes.
Received August 19, 2013, published online November 26, 2013, DOI: 10.1002/celc.201300134 – read now.
DNA-Promoted Ultrasmall Pd Nanocrystals on Carbon Nanotubes: Towards Efficient Formic Acid Oxidation
Lian Ying Zhang, Chun Xian Guo, Hongchang Pang, Weihua Hu, Yan Qiao, and Chang Ming Li*
Immobilizing DNA on carbon nanotubes (CNTs) facilitates the growth of uniformly distributed, ultrasmall Pd nanocrystals with good crystalline structure, which results in the frabrication of a unique Pd-DNA@CNTs electrocatalyst. In comparison to Pd-CNTs and commercial Pd/C, the Pd-DNA@CNTs electrocatalyst exhibits a more negative oxidation peak potential, higher catalytic current density, lower charge-transfer resistance, and much better stability towards formic acid oxidation, thus providing great potential as a promising anode catalyst in direct formic acid fuel cells.
Received July 10, 2013, published online September 10, 2013, DOI: 10.1002/celc.201300095 – read now.
Highly Disordered Carbon as a Superior Anode Material for Room-Temperature Sodium-Ion Batteries
Xiaosi Zhou and Yu-Guo Guo
Highly disordered carbon (HDC) is synthesized by using a self-assembly approach based on the electrostatic attractions between two oppositely charged polyelectrolytes in water, and subsequent pyrolysis of the resulting white precipitate. This novel HDC has a spacing of 0.39 nm between the graphitic layers, which is essential for the desired sodium-ion insertion/extraction ability. As a superior anode material for room-temperature sodium-ion batteries, HDC exhibits a superior cycling stability and rate capability. A reversible capacity of 225 mAh g-1 and a capacity retention of 92% are achieved at 100 mA g-1 after 180 cycles.
Received June 11, 2013, published online August 5, 2013, DOI: 10.1002/celc.201300071 – read now.