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Despite extensive study on single-layer layered double hydroxides (SL-LDHs) with NO counterions, SL-LDHs with CO counterions (CO SL-LDHs) have never been prepared before. Herein, a CoAl-CO SL-LDH which stays stable in water and powdery state is first synthesized using ethylene glycol as a reaction medium. The SL-LDH, with thickness of ∼0.85 nm, is composed of one Co(Al)O layer sandwiched between two CO layers. The SL-LDH powder shows high specific surface area (∼289 m/g) and excellent electrocatalytic oxygen evolution efficiency. This work provides the first simple way to prepare CO SL-LDHs and will open an avenue for synthesizing other SL-LDHs.

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Functional nanomaterials have attracted significant attention in a variety of research fields (in particular, in the healthcare system) because of the easily controllable morphology, their high chemical and environmental stability, biocompatibility, and unique optoelectronic and sensing properties. The sensing properties of nanomaterials can be used to detect biomolecules such as cholesterol. Over the past few decades, remarkable progress has been made in the production of cholesterol biosensors that contain nanomaterials as the key component. In this article, various nanomaterials for the electrochemical sensing of cholesterol were reviewed. Cholesterol biosensors are recognized tools in the clinical diagnosis of cardiovascular diseases (CVDs). The function of nanomaterials in cholesterol biosensors were thoroughly discussed. In this study, different pathways for the sensing of cholesterol with functional nanomaterials were investigated.