We illustrate an all solid-state ZnÀair battery by utilizing the ability of a titanium-nitride-functionalized molecular catalyst to mediate the oxygen reduction reaction by avoiding the parasitic corrosion chemistry and the hydroxide-holding capacity of the Zirfon membrane. The efficient ionic communication between the half-cell electrodes provided by the Zirfon membrane in combination with the chemical/electrochemical stability of the TiN-based air electrode ultimately led to an all solid-state and air-breathing battery possessing high durability and stability.Electrochemical energy storage and conversion devices such as batteries, fuel cells and supercapacitors have the potential to address global warming and alarming pollution due to their near zero emission power output. [1][2][3][4][5][6][7] MetalÀair batteries are new generation batteries which are anticipated to contribute to long driving range per charge compared to conventional metal ion batteries. [8][9][10][11][12] The air electrode architecture is expected to increase gravimetric energy storage capability of the device since oxygen in principle can be accessed from atmosphere circumventing the storage of oxidant on board the device. [13][14][15] Though non aqueous Li air batteries are being pursued intensely across the world, aqueous ZnÀair batteries are much evolved and even used in commercial hearing aid devices. [16][17][18][19][20][21][22][23][24] However, oxygen reduction reaction (ORR), the cathodic halfcell reaction in air batteries often require precious metal based electrocatalyst to catalyze the 4 electron scission of molecular oxygen. [25][26][27][28][29] Usually Pt is supported on carbon which is known to undergo extensive corrosion in presence of oxygen and especially peroxide, the 2 electron product of ORR. [30][31][32] Pt is also known to catalyze carbon corrosion resulting in sintering and agglomeration of Pt nanoparticles and ultimately to the loss of precious metals. [33,34] We demonstrate that by replacing carbon with conducting titanium nitride (TiN), an extremely corrosion resistant as well as chemically stable material used in aberration industry, [35][36][37] carbon corrosion and its negative consequences can be addressed at the air electrode of metalair batteries. Further, we show a strategy for tuning the catalytic activity of this promising corrosion resistant catalytic support by simple diazotization reaction. [38] We have exploited the base reservoir capability of Zirfon PERL UTP 500 membrane for ionic communication between the half-cells. [39,40] To develop an all solid-state metalÀair battery. The results demonstrate that TiN based catalytic system outperforms carbon based catalysts in terms of long-term stability and durability ultimately leading to an all solid-state ZnÀair battery possessing a corrosion resistant air electrode.TiN particles were flake like with irregular morphology, scanning electron microscopic image, Figure 1a. Energy dispersive X-ray (EDX), Figure 1b, clearly indicates the constituent elements are m...

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Bipolar junction transistors (BJTs) can function as electrically reversible switches; nevertheless, triggering such circuits requires a distinct voltage bias at the base terminal. Here, we show a proof‐of‐concept of an electrochemical switching device equipped with a redox electrode whose bi‐stable interfacial chemistry, reliant on hydronium ion strength, can provide distinct logic HIGH (1) and logic LOW (0) levels of operation, enabling it to control and command an electronic circuit without the aid of any external voltage input. Electrochemical impedance spectroscopy, quartz crystal microbalance studies, and UV/Vis spectroscopy demonstrate that discrete logic levels are controlled by the solvent‐mediated charge injection/ejection kinetics at the redox‐active half‐cell electrode, leading to a chemically reversible switch with a response time of approximately 1 s and an operating speed of 225 cycles per hour. We demonstrate that the logic HIGH level of the interfacial twin states is actuated when exposed to acid‐contaminated wastewater, automatically triggering the command for remediation.

Electrochemical interfaces invariably generate unipolar electromotive force because of the unidirectional nature of electrochemical double layers. Herein we show an unprecedented generation of a time varying bipolar electric field between identical half-cell electrodes induced by tailored interfacial migration of magnetic particles. The periodic oscillation of a bipolar electric field is monotonically correlated with velocity-dependent torque, opening new electrochemical pathways targeting velocity monitoring systems.

We illustrate that the extent of hydration and consequently the heat of hydration of alkali metal ions can be utilized to control their insertion/deinsertion chemistry in a redox active metal coordination polymer framework (CPF) electrode. The formal redox potential of CPF electrode for cation intercalation is inversely correlated to hydrated ionic radii, with clear distinction between the intercalation of ions across alkali metal series. This leads to noninvasive identification and differentiation of cations in the alkali metal series by utilizing a single sensing platform.