Take a look at the great cover images from the August issues and top five most downloaded articles this month.

Issue 15

Polymer Solar Cells

Molecular orientation plays a critical role in determining the performance of all-polymer solar cells. In article number 1600504, Bumjoon J. Kim and co-workers report an approach for tuning the molecular crystallinity and orientation of naphthalenediimide-bithiophene-based n-type polymers (P(NDI2HD-T2)) by controlling their number average molecular weights. The cover image depicts the bulk heterojunction all-polymer solar cell with PTB7-Th donor and P(NDI2HD-T2) acceptor. The packing orientation of two polymers in thin film and at the interface is critical for producing high-performance solar cells.

Issue 16

Flexible Supercapacitors

 Applications of smart watches are limited due to present design of energy storage devices. In article number 1600763, Xingbin Yan and co-workers describe for the first time the fabrication of a novel flexible solid-state supercapacitor to integrate energy storage device with a watchband. The as-assembled smart watchband exhibits excellent electrochemical stability during statical and dynamical bending. As a smart energy-support watchband, it maintains shape memory property which can be automatically induced by touching it with the human wrist.

Top 5 most downloaded papers in August:

Encapsulating Sn Nanoparticles in Amorphous Carbon Nanotubes for Enhanced Lithium Storage Properties

by Xiaosi Zhou, Le Yu, Xin-Yao Yu, Xiong Wen (David) Lou

Ionic Liquid Control Crystal Growth to Enhance Planar Perovskite Solar Cells Efficiency

by Ji-Youn Seo, Taisuke Matsui, Jingshan Luo, Juan-Pablo Correa-Baena, Fabrizio Giordano, Michael Saliba, Kurt Schenk, Amita Ummadisingu, Konrad Domanski, Mahboubeh Hadadian, Anders Hagfeldt, Shaik M. Zakeeruddin, Ullrich Steiner, Michael Grätzel, Antonio Abate

2D Materials Beyond Graphene for High-Performance Energy Storage Applications

by Xiaoyan Zhang, Lili Hou, Artur Ciesielski, Paolo Samorì

Two-Dimensional Metal Oxide and Metal Hydroxide Nanosheets: Synthesis, Controlled Assembly and Applications in Energy Conversion and Storage

by Johan E. ten Elshof, Huiyu Yuan, Pablo Gonzalez Rodriguez

Highly Active and Stable Graphene Tubes Decorated with FeCoNi Alloy Nanoparticles via a Template-Free Graphitization for Bifunctional Oxygen Reduction and Evolution

by Shiva Gupta, Liang Qiao, Shuai Zhao, Hui Xu, Ye Lin, Surya V. Devaguptapu, Xianliang Wang, Mark T. Swihart, Gang Wu