A high entropy metal–organic framework (HE-MOF) with five near-equimolar components was synthesized by a solution phase method and served as an electrochemical oxygen evolution catalyst.

The survey could make managers know their prevalence level of pressure ulcers and provide priorities for clinical nurses.

The leaching and recycling of valuable metals via environmentally benign solvents is important because of the everincreasing waste lithium-ion batteries, but it remains a challenge. Herein, a multi-functional deep eutectic solvent (DES) based on lactic acid (LA) and guanidine hydrochloride (GHC) was used to extract cobalt and lithium ions from LiCoO 2 . Due to the strong acidity (protons) and abundant chlorine coordinating ions of LA/GHC, the solubility of LiCoO 2 in LA/GHC could reach as high as 19.9 mg g À 1 (stirred at 80 °C for 24 h), and a little LiCoO 2 powder even could be dissolved at room temperature without stirring. Oxalic acid was used to strip and separate the oxalates of cobalt and lithium. Furthermore, LA/ GHC could be recycled with a similar dissolving performance. This work avoided using corrosive acids and could be realized at low temperature (80 °C), making it energy-saving and costeffective. It shows DESs have great potential in extracting strategically important metals from LiCoO 2 cathodes and provides an efficient and green alternative for sustainable recycling of spent lithium-ion batteries.

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