Water, considered as a universal solvent to dissolve salts, has been extensively studied as liquid electrolyte in electrochemical devices. The water/ice phase transition at around 0 °C presents a common phenomenon in nature, however, the chemical and electrochemical behaviors of ice have rarely been studied. Herein, we discovered that the ice phase provides efficient ionic transport channels and therefore can be applied as generalized solid‐state ionic conductor. Solid state ionic conducting ices (ICIs) of Li+, Na+, Mg2+, Al3+, K+, Mn2+, Fe2+, Co2+, Ni2+, Cu2+, and Zn2+, frozen from corresponding sulphate solutions, exhibit ionic conductivities ranging from ≈10−7 S cm−1 (Zn2+) to ≈10−3 S cm−1 (Li+) at temperatures spanning from −20 °C to −5 °C. The discovery of ICIs opens new insight to design and fabrication of solid‐state electrolytes that are simple, inexpensive, and versatile.

Carbon nanoparticles (CNPs) have been considered as essential components for various applications including sensors, quantum dots, electrocatalysts, energy storages, lubrication, and functional coatings. Uniform and functional CNP materials can be obtained from candle soot. However, the production of CNPs from candle soot is not a continuous process, limiting the practical production and applications of such materials. Here, a rotatingdeposition and separation system for high-efficiency production of low-cost and high-quality CNPs from candle soot is presented. The characteristic of CNPs can be controlled by adjusting the system parameters. Moreover, obtained CNPs can act as photothermal superhydrophobic anti-icing coatings on various substrates. With a sliding angle of less than 3°, water drops can keep rolling off without further nucleation of ice. The reported preparing method is suitable for large-scale applications and various kinds of surfaces and shows great potentials in the growing demands of anti-icing.

Water,c onsidered as au niversal solvent to dissolve salts,h as been extensively studied as liquid electrolyte in electrochemical devices.T he water/ice phase transition at around 0 8 8Cp resents ac ommon phenomenon in nature, however,t he chemical and electrochemical behaviors of ice have rarely been studied. Herein, we discovered that the ice phase provides efficient ionic transport channelsand therefore can be applied as generalized solid-state ionic conductor.Solid state ionic conducting ices (ICIs) of Li + ,Na + ,Mg 2+ ,Al 3+ ,K + , Mn 2+ ,F e 2+ ,C o 2+ ,N i 2+ ,C u 2+ ,a nd Zn 2+ ,f rozen from corresponding sulphate solutions,e xhibit ionic conductivities ranging from % 10 À7 Scm À1 (Zn 2+ )t o% 10 À3 Scm À1 (Li + )a t temperatures spanning from À20 8 8Ct oÀ5 8 8C. The discovery of ICIs opens new insight to design and fabrication of solidstate electrolytes that are simple,i nexpensive,and versatile.

The increasing demand for clean energy conversion and storage has increased interest in hydrogen production via electrolytic water splitting. However, the simultaneous production of hydrogen and oxygen in this process poses a challenge in extracting pure hydrogen without using ionic conducting membranes. Researchers have developed various innovative designs to overcome this issue, but continuous water splitting in separated tanks remains a desirable approach. This study presents a novel, continuous roll‐to‐roll process that enables fully decoupled hydrogen evaluation reaction (HER) and oxygen evolution reaction (OER) in two separate electrolyte tanks. The system utilizes specially designed “cable‐car” electrodes (CCE) that cycle between the HER and OER tanks, resulting in continuous hydrogen production with a purity of over 99.9% and Coulombic efficiency of 98% for prolonged periods. This membrane‐free water splitting system offers promising prospects for scaled‐up industrial‐scale green hydrogen production, as it reduces the cost and complexity of the system, and allows for the use of renewable energy sources to power the electrolysis process, thus reducing the carbon footprint of hydrogen production.

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Silver particles are key materials for the production of conductive inks, which are typically thermally sintered to obtain high conductivity. However, it remains a big challenge to achieve high conductivity at temperatures lower than 150 °C, for the protection of heat‐sensitive components in printed electronic devices. In this study, a novel frigid synthesis strategy at subzero temperature (Celsius) to produce Ag NPs with rich, rose‐like nanostructures (Ag nano‐flowers) is developed. The growth mechanism of Ag nano‐flowers under frigid conditions is analyzed and discussed. Due to the fine nanoscale structure of Ag nano‐flowers, they exhibit low sintering temperature below 120 °C. The electrical conductivity of printed Ag nano‐flower foil reaches 8.64 × 104 S cm−1 at 120 °C, and 1.20 × 105 S cm−1 at 150 °C. This study provides an attractive approach to the facile fabrication of Ag nano‐flowers with high electronic conductivity sintered at low temperatures and grants new insights into nanocrystallization under low‐temperature conditions.

Solid electrolytes can be applied in the metal electrodeposition industry.