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ABSTRACT Nanomaterials play a crucial role in transforming energy devices into renewable energy storage devices, thanks to their small size and unique structural & electrical properties. The electrical, optical, and charge‐transfer properties of nanomaterials enable the design of innovative devices. High surface area and small size are the main characteristics of these materials that help to increase the efficiency of innovative renewable devices such as batteries and cells. Sol‐gel, hydrothermal, and vapor deposition are generally used for the synthesis of advanced nanomaterials. However, green approaches are mostly preferred for making these nanomaterials to protect the environment and achieve sustainability. Silicon nanowire anodes that can accommodate significant volume changes during cycling, leading to capacity exceeding 3500 mAh g − 1 and a noticeably longer cycle life compared to traditional graphite. 2D MXene (TiC 2 T x ) nanosheets were prepared to produce electrodes with ultrahigh rate capability and high capacitance, suitable for rapid charge‐discharge cycles for grid frequency management. Based on their unique properties, these nanomaterials are selected for advancing energy storage devices. However, risk assessment, large‐scale manufacturing, and the long‐term stability of these nanomaterials remain challenging. This paper aims to analyze the properties of nanomaterials and their synthesis for the development of innovative energy storage devices.