On June 2, 2022, Chem published online a new progress on field-effect energy storage chips by Prof. Liqiang Mai's team at Wuhan University of Technology, entitled "Quadrupling the stored charge by extending the accessible density of states". By constructing the gradient Fermi surface structure in situ in the energy storage material, the group has broadened the embedding energy level of the material, which has increased the ion migration rate of the electrode material by 10 times and the capacity of the material by more than 3 times.  Mengyu Yan, Peiyao Wang, and Xuelei Pan are the co-first authors of the paper, and Professor Liqiang Mai is the sole corresponding author of the paper.  Nanodevices, such as intracellular recording sensors, electronic devices, solar cells, thermoelectric conversion devices, and nanogenerators, are expected to be essential components of maintenance-free implantable biosensors. Traditionally, integrated devices contain three key components: energy harvesting, energy storage, and functional components (e.g., sensors, data senders, and data controllers). Energy storage devices can store discrete energy collected by solar cells, nanogenerators, or thermoelectric conversion devices and then continuously power sensors and electronic devices. Therefore, the development of nanoscale energy storage devices is of great importance as an integral part of integrated maintenance-free devices. Field effects are widely used in nanoscale electronics, such as transistors for logic circuits and amplifiers, electronic phase transitions and modulation of liquid/solid interfaces to achieve liquid-gated interface superconductivity. Although the use of magnetic fields in combination with electrochemical energy storage devices has shown some interesting results, it requires a magnetic component in the device, thus limiting its application. Currently, electric field effects have not been integrated into electrochemical energy storage devices. Although electrochemical energy storage devices change electronic properties when charge transfer occurs, the direct link between modulation of the electron density of states (EDOS) and the energy storage process is not known.  In this work, Prof. Liqiang Mai's team proposed a new idea of modulating the Fermi energy level structure of materials to multiply the performance of energy storage chips, and designed and constructed a new architecture of field-effect energy storage chips to achieve in situ modulation and performance enhancement of the Fermi surface gradient of materials under electrochemical conditions. It is shown that the gradient Fermi surface structure is constructed in situ in the energy storage material to broaden the embedding energy level of the material. The application of field effects increases the ion migration rate by 10 times and increases the material capacity by more than 3 times. This research result solves the scientific problem of unclear mechanism of the effect of Fermi surface gradient on electrochemical reaction, realizes the synergistic enhancement of nanowire capacity and reaction potential, fills the gap in the field of field-effect energy storage chips, and lays the scientific foundation for the application of energy storage chips in the Internet of Things and other fields.   Translated with www.DeepL.com/Translator (free version)