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Wiley Online Library : Advanced Energy Materials

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Masthead: (Adv. Energy Mater. 5/2023)

In Situ Detection of Iron in Oxidation States ≥ IV in Cobalt‐Iron Oxyhydroxide Reconstructed during Oxygen Evolution Reaction

Herein, helical borophosphates with different Co:Fe ratios are transformed into disordered cobalt-iron oxyhydroxides for the oxygen evolution reaction. The redox behavior and the active structure are identified by in situ X-ray absorption spectroscopy. The iron in oxidation states ≥ IV (Fe4+) and its substantial redox behavior is detected. The authors...

Decoration of NiFe‐LDH Nanodots Endows Lower Fe‐d Band Center of Fe1‐N‐C Hollow Nanorods as Bifunctional Oxygen Electrocatalysts with Small Overpotential Gap

Oxygen evolution reaction (OER)-active NiFe-layered double hydroxide (LDH) nanodots are evenly decorated on the oxygen reduction reaction (ORR)-active Fe1-N-C hollow nanorods to realize bifunctional ORR/OER activity in one monolithic catalyst with a small overpotential gap of only 0.65 V. NiFe-LDH regulates the electronic structures of Fe1-N-C by transferring...

Achieving High‐Power and Dendrite‐Free Lithium Metal Anodes via Interfacial Ion‐Transport‐Rectifying Pump

An interfacial ion-transport-rectifying pump (composed of negative charge interfaces, ion channels, and lithiophilic sites) is strategically designed for tackling the chronic issue of dendritic growth of lithium. The synergetic interactions of the pump decrease the desolvation energy barrier and facilitate fast and homogenized Li-ion flux, which results...

High Entropy Enabling the Reversible Redox Reaction of V4+/V5+ Couple in NASICON‐Type Sodium Ion Cathode

A high-entropy NASICON-type Na3VAl0.2Cr0.2Fe0.2In0.2Ga0.2(PO4)3 (NVMP) cathode is proposed. The irreversible phase transition induced by the redox reaction of the V4+/V5+ couple (4.0 V versus Na+/Na) in a NASICON matrix is apparently depressed by the high entropy effect. The NVMP cathode offers a reversible specific capacity of 102 mAh g-1 and excellent...

High‐Temperature Thermoelectricity in Narrow‐Gap Semiconductor SmS with Strong Electron‐Hole Asymmetry

Due to the strong electron-hole asymmetry in the electronic structure, intrinsic excitation benefits the high-temperature thermoelectric transport of the narrow band-gap semiconductor SmS. Consequently, a high-power factor of 1.41 mW K–2 m–1 and a peak zT value of 1.1 at 1123 K are attained, which is among the best n-type high-temperature thermoelectrics....

Molecular Trap Engineering Enables Superior High‐Temperature Capacitive Energy Storage Performance in All‐Organic Composite at 200 °C

Ultrahigh discharged energy density at 200 °C is achieved in all-organic polymer composite dielectrics through substituent engineering of organic semiconductors. This work provides new insights into the molecular charge traps that control electrical conduction at high temperatures and high fields, which is expected to enable the rational design and...

Molecular‐Layer‐Deposited Zincone Films Induce the Formation of LiF‐Rich Interphase for Lithium Metal Anodes

A polar and lithiophilic zincone is fabricated on 3D copper nanowires by a molecular layer deposition technique. Because of the formation of LiF-rich interphase and the lithiophilicity of zinc, the resultant CuNW@ZnHQ electrode realizes high cycling stability for more than 7000 h at 1 mAh cm−2. Abstract Lithium metal anodes suffer from low Coulombic...

Decoupling Accurate Electrochemical Behaviors for High‐Capacity Electrodes via Reviving Three‐Electrode Vehicles

A technique for assessing accurate electrochemical behavior for high-capacity electrodes is reported, that revives a single-channel three-electrode testing vehicle to mitigate the mismatch between traditional evaluation configurations and testing at increased current density. Abstract Developing high-capacity electrodes requires the evaluation...

Engineering Pt Coordination Environment with Atomically Dispersed Transition Metal Sites Toward Superior Hydrogen Evolution

The introduction of V single sites and V2O5 clusters modulates the coordination structures of Pt single, dual, and multiatoms, promoting the generation of Pt clusters and Pt–Pt/V dual sites and leading to superior hydrogen evolution reaction activity. Pt@VNC requires an ultrasmall overpotential of 5 mV to reach a current density of 10 mA cm−2 in a H2-saturated...

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