**Preface**

Emerging renewable energy sources have received extensive attention in the past few decades. Energy storage has been one of the hottest research fields for more than half a century. Recently, low-dimensional nanostructured materials have been widely investigated due to their fascinating performances in energy storage fields. Great efforts have been devoted to studying their synthesis strategies, unique properties, and potential applications in various electrochemical devices. Nevertheless, challenges still exist, and many energy devices are still highly demanded for practical applications. At the same time, the ever-increasing demand for alternative energy strategies to fossil fuels and electrochemical cells has initiated considerable efforts to develop novel and renewable energy storage systems. Considering the synergetic effects between different components, hybrid nanomaterials may demonstrate dramatically enhanced performance compared to their single components. It is therefore urgent and significant to have a Special Issue to appreciate updated advances and to review recent progress regarding nanostructured electrodes for high-performance supercapacitors and batteries. In this Special Issue, we collected 21 papers, including 17 research articles and 4 review papers. It covers supercapacitors, sensors, catalysts, metal-ion batteries, solar cells, and so on.

> **Xiang Wu** *Editor*
