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Prussian blue analogs (PBAs) with unique structure show great potential for aqueous potassium-ion batteries (AKIBs). Herein, K2Co[Fe(CN)6] and KNi[Co(CN)6] architectures are developed as the cathode candidates for AKIBs. Moreover, the reaction kinetics detection and DFT calculations are employed to analyse the battery performances. [ABSTRACT FROM AUTHOR]

Developing non-noble metal-based electrocatalysts with high catalytic activity is an urgent task for overall electrocatalytic water decomposition. In this study, carbon-incorporated porous honeycomb NiCoFe phosphide (labelled NiCoFeP/C) was successfully developed from a metal–organic framework (MOF) precursor for the first time. Benefitting from a unique structure and compositional advantages, NiCoFeP/C exhibits excellent bifunctional electrocatalytic activity for the oxygen evolution reaction/hydrogen evolution reaction (OER/HER) in alkaline solution, showing low OER and HER overpotentials of 270 and 149 mV at 10 mA cm−2, respectively. This work successfully developed a MOF-derived novel multi-component transition metal phosphide with a unique structure, which shed some light on the development of promising catalysts for the OER/HER. [ABSTRACT FROM AUTHOR]

Carbon-incorporated NiO/Co3O4 concave surface microcubes (denoted as NCMC) are successfully developed from a precursor of Ni3[Co(CN)6]2 for the first time. The NCMC exhibits excellent electrocatalytic activity for the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER) in potassium hydroxide solution, affording a current density of 10 mA cm−2 at 169.5 mV for the HER and 290 mV for the OER, respectively. This communication describes a rational design of MOF-derived mixed metal oxides as electrocatalysts for overall water splitting, promoting the further development of MOF materials in the field of energy conversion. [ABSTRACT FROM AUTHOR]

Using an environmentally friendly method to produce a stable and highly catalytically active electrocatalyst for the oxygen evolution reaction (OER) is becoming increasingly urgent. Herein, a novel bimetallic metal–organic framework (MOF), specifically a copper–cobalt 1, 3, 5-benzenetricarboxylate (Cu–Co-BTC) MOF, was successfully prepared by employing the gas–solid two-phase flow (GSF) synthetic technique. The as-prepared Cu–Co-BTC with its multiple active sites afforded a current density of 10 mA cm−2 at 239 mV for the OER in a 1 mol L−1 KOH solution, and showed a better electrocatalytic performance than did single-metal-containing Cu-BTC and Co-BTC materials. This work provides a new idea, one involving using novel gas–solid phase reactions for the preparation of electrocatalysts in large quantities. [ABSTRACT FROM AUTHOR]

The gradient temperature was manipulated to construct hollow irregular carbon spheres with regulated intrinsic defects and surface area targeting favorable potassium storage. An enlarged surface area, increased intrinsic defects, and superior conductivity induced more surface-active interfaces. These actions facilitated a high reversible capacity as well as excellent cycling stability. [ABSTRACT FROM AUTHOR]