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The development of Zn-free anodes to inhibit Zn dendrite formation and modulate high-capacity Zn batteries is highly applauded yet very challenging. Here, we design a robust two-dimensional antimony/antimony-zinc alloy heterostructured interface to regulate Zn plating. Benefiting from the stronger adsorption and homogeneous electric field distribution of the Sb/Sb 2 Zn 3 -heterostructured interface in Zn plating, the Zn anode enables an ultrahigh areal capacity of 200 mAh cm -2 with an overpotential of 112 mV and a Coulombic efficiency of 98.5%. An anode-free Zn-Br 2 battery using the Sb/Sb 2 Zn 3 -heterostructured interface@Cu anode shows an attractive energy density of 274 Wh kg -1  with a practical pouch cell energy density of 62 Wh kg -1 . The scaled-up Zn-Br 2 battery in a capacity of 500 mAh exhibits over 400 stable cycles. Further, the Zn-Br 2 battery module in an energy of 9 Wh (6 V, 1.5 Ah) is integrated with a photovoltaic panel to demonstrate the practical renewable energy storage capabilities. Our superior anode-free Zn batteries enabled by the heterostructured interface enlighten an arena towards large-scale energy storage applications., (© 2023. The Author(s).)

Conventional electric double-layer capacitors are energy storage devices with a high specific power and extended cycle life. However, the low energy content of this class of devices acts as a stumbling block to widespread adoption in the energy storage field. To circumvent the low-energy drawback of electric double-layer capacitors, here we report the assembly and testing of a hybrid device called electrocatalytic hydrogen gas capacitor containing a hydrogen gas negative electrode and a carbon-based positive electrode. This device operates using pH-universal aqueous electrolyte solutions (i.e., from 0 to 14) in a wide temperature range (i.e., from - 70 °C to 60 °C). In particular, we report specific energy and power of 45 Wh kg -1 and 458 W kg -1 (both values based on the electrodes' active materials mass), respectively, at 1 A g -1 and 25 °C with 9 M H 3 PO 4 electrolyte solution. The device also enables capacitance retention of 85% (final capacitance of about 114 F g -1 ) after 100,000 cycles at 10 A g -1 and 25 °C with 1 M phosphate buffer electrolyte solution., (© 2022. The Author(s).)