CO2 electroreduction is of great significance to reduce CO2 emissions and complete the carbon cycle. However, the unavoidable carbonate formation and low CO2 utilization efficiency in neutral or alkaline electrolytes hinder its application at commercial scale. The development of CO2 reduction under acidic conditions provides a promising strategy, but the inhibition of the hydrogen evolution reaction is difficult. Herein, the first work to design a Ni–Cu dual atom catalyst supported on hollow nitrogen‐doped carbon is reported for pH‐universal CO2 electroreduction to CO. The catalyst shows a high CO Faradaic efficiency of ≈99% in acidic, neutral, and alkaline electrolytes, and the partial current densities of CO reach 190 ± 11, 225 ± 10, and 489 ± 14 mA cm−2, respectively. In particular, the CO2 utilization efficiency under acidic conditions reaches 64.3%, which is twice as high as that of alkaline conditions. Detailed study indicates the existence of electronic interaction between Ni and Cu atoms. The Cu atoms push the Ni d‐band center further toward the Fermi level, thereby accelerating the formation of *COOH. In addition, operando characterizations and density functional theory calculation are used to elucidate the possible reaction mechanism of CO2 to CO under acidic and alkaline electrolytes.
The recent boom in flexible and wearable electronics requires their power sources not only to be adequately compact but also could undergo extreme deformation without significant degradation in performance. Here, flexible and tailorable quasi‐solid‐state microsized Ag/Zn batteries (micro‐AZBs) were designed by combining mask‐assisted spray printing and electrochemical deposition strategies. The micro‐AZBs display ultrastable output voltage, excellent energy, and power densities, as well as stable cycling performance. Furthermore, the micro‐AZBs with desired shapes can be designed in series or in parallel on a flexible chip to output improved voltage or current with the internal connection. More importantly, the microelectrodes could be sprayed on various substrates. Flexible micro‐AZBs could be achieved on flexible substrates and tailorable micro‐AZBs are obtained when they are fabricated on clothes. They exhibit stable electrochemical performance even under bending or cutting states. The novel design of such quasi‐solid‐state micro‐AZBs would pave a way for the miniaturization and integration of energy storage devices.
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