Exfoliating spent cathode materials with robust interlayer interactions into atomic-thin nanosheets for boosting the oxygen evolution reaction

Abstract

Exfoliation of bulk materials is an efficient approach for the fabrication of two-dimensional nanomaterials, whereas the applications of the method are mostly limited to the delamination of materials with weak...

Waste-Derived Catalysts for Water Electrolysis: Circular Economy-Driven Sustainable Green Hydrogen Energy

“…Huang and coworkers developed a positive-bias-driven exfoliation method to convert spent LiCoO 2 electrode materials into CoOOH which shows high OER performance (Fig. 3d) [79]. This electrochemical exfoliation process provides an eco-friendly, and high-efficiency route for constructing electrocatalysts by destroying the crystal structure of parent materials and oxidizing the electroactive elements to a high-valence state, which is suggested to benefit the OER process.…”

“…Consequently, it is sensible to develop metal (oxy)hydroxides directly from wastes. The NiFe hydroxides and NiCu hydroxides synthesized from upcycled capacitors [156], spent Li-ion batteries-derived Ni 0.5 Mn 0.3 Co 0.2 (OH) 2 [157], NiFe LDH/ Cu(OH) 2 /Cu prepared from spent Cu cable wires [78], and CoOOH obtained from spent Li-ion batteries [79] are representative efficient OER catalysts. Among these catalysts, the self-supported NiFe LDH/Cu(OH) 2 /Cu catalyst delivers a good OER activity (η 100 = 390 mV) with excellent stability for 24 h, owing to its hierarchically heterostructural feature [78].…”

Roles of Metal Oxide Nanostructure-Based Substrates in Sustainable Electrochemical Water Splitting: Recent Development and Future Perspective

“…Defect engineering is a promising approach to regulate the catalysts’ chemical and physical features with oxygen-rich vacancies and enormous specific surface area by a single-step plasma etching procedure for outstanding catalytic performance. ,− Additionally, defect introduction and electrical conductivity improvement are two ways to increase catalytic activity. Exposing many effective active centers for the electrode is also crucial for defining catalytic activity. , Porous nanostructures may facilitate a great surface area and maximum active centers with greater OER and HER performances compared to those of compact nanostructures. − Also, functional site loss is typical for layered electrocatalysts because too much thick layer is exposed thoroughly, allowing the electrocatalytic activity to be improved by synthesizing ultrathin layered composites with atomic-level thickness. , The morphology, unique chemical/physical electronic surface properties, and linkage with the catalytic substrates generating robust interfacial effects were engineered to enhance the electrochemical performances and stability for water splitting. ,, To overcome inadequate exposed active sites and lower electrical conductivity, such oxides of transition metal are usually coated on the metallic or conductive substrate to synthesize hybrid electrocatalysts for water electrolysis . Substrates play a vital role in catalysis because certain factors such as stability, conductivity, and electrochemical performance usually are improved by exemplification and modification of nanomaterial microstructures, advanced material configuration with numerous active phases, hybridization with conductive nanocarbon composites, and engineering an interfacial substrate surface .…”

Preparation of single-crystal ternary cathode materials via recycling spent cathodes for high performance lithium-ion batteries

“…10,11 Therefore, it is indispensable to develop state-ofthe-art methods for recycling spent NCM, so as to achieve the sustainable development of LIBs and environmental protection. [12][13][14] Pyrometallurgy and hydrometallurgy or their combination are conventional methods that have been widely adopted for recovering the valuable metals in spent LIBs. 15 The pyrometallurgical process usually includes high-temperature thermal treatment and mechanochemical and dissolution processes.…”

“…10,11 Therefore, it is indispensable to develop state-of-the-art methods for recycling spent NCM, so as to achieve the sustainable development of LIBs and environmental protection. 12–14…”