Highly active, cost‐effective, and durable catalysts for oxygen evolution reaction (OER) are required in energy conversion and storage processes. A facile synthesis of CoFe layered double hydroxide (CoFe LDH) is reported as a highly active and stable oxygen evolution catalyst. By varying the concentration of the metal ion precursor, the Co/Fe ratios of LDH products can be tuned from 0.5 to 7.4. The structure and electrocatalytic activity of the obtained catalysts were found to show a strong dependence on the Co/Fe ratios. The Co2Fe1 LDH sample exhibited the best electrocatalytic performance for OER with an onset potential of 1.52 V (vs. the reversible hydrogen electrode, RHE) and a Tafel slope of 83 mV dec−1. The Co2Fe1 LDH was further loaded onto a Ni foam (NF) substrate to form a 3D porous architecture electrode, offering a long‐term current density of 100 mA cm−2 at 1.65 V (vs. RHE) towards the OER.

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Rice-like NiCuOx nanoparticles, fabricated via a one-step method, exhibit enhanced electrocatalytic activity and stability towards the OER.

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The interface problem caused by the contact between the electrodes and the solid electrolyte was the main factor hindering the development of solid-state batteries. To enhance the electrode|solid electrolyte interface property, we designed a hybrid electrolyte, the combination of x vol % Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 (LATP) inorganic solid electrolyte and 1 − x vol % liquid organic electrolyte (LE). In this work, the 1 − x vol % LE was dropped between the electrode and the solid electrolyte, and it is found that the electrochemical performance of the LiFePO 4 |Li solid−liquid hybrid battery is significantly improved. At the current density of 0.1 and 0.5 C, the LATP with 15% liquid organic electrolyte could deliver a specific capacity of 160.5 and 124.3 mAh g −1 , respectively; moreover, the specific discharge capacity remained as high as 111 mAh g −1 at 0.5 C after 100 cycles, indicating that the larger interface impedance was eliminated. The LE may have three functions: (1) forming a solid−liquid electrolyte interphase on the surface of the LATP particles to prevent further reduction of LATP, (2) wetting the electrode and solid electrolyte to reduce the interface resistance, and (3) improving interfacial Li-ion transport.

Using PPC interlayers to protect the LAGP electrolyte and reduce the interfacial impedance between electrode and electrolyte.

Ceramic electrolyte guarantees the commercial application of all-solid-state lithium batteries (ASSLBs) for its high ionic conductivity and wide voltage window. However, the large interfacial impedance between the ceramic and polymeric electrolyte is still tough issue for all-solid-state batteries. Here, a “self-sacrifice” interface established by a flexible Li1.5Al0.5Ge1.5(PO4)3 (LAGP)/30% poly­(propylene carbonate) (PPC) solid composite electrolyte causes a performance enhancement of the LiFePO4/Li battery with a discharge specific capacity of 151 mA h g–1 at 0.05 C and a retention of 92.3% for 100 cycles at 55 °C without any liquid electrolyte, where the PPC-derived layer swells the Li metal and infiltrates to develop the amorphous state to reduce both interfacial and bulk resistance; while the LAGP with good mechanical strength and the LiF layer provides stability and resists the growth of Li dendrites, which guaranteed the long cycle life and security of batteries. This study demonstrates the complementary advantages of ceramic and polymer, which implies a feasible way to achieve a well-wetted, soft, and stable contact of the electrolyte and electrode to overcome the interface issues in ASSLBs.

A free standing porous Co/Mo architecture is fabricated by CAN etching and exhibits robust bifunctional catalysis towards OER and HER.