One-pot synthesis of delafossite CuCoO2 microcrystal as visible-light-driven photocatalyst

CuCoO2 nanocrystals derived from an isopropanol-modified Cu-BTC using alkaline water oxidation

“…The strong peaks at the BE of 932.3 eV and 952.1 eV are assigned to Cu + ions, 12 and the other peaks located around the BE of 934 eV and 954.5 eV correspond to Cu 2+ ions. 15 It can be concluded that the new appearance of Cu 2+ in the CCO2 sample after the subsequent OER process (the Cu 2+ content increased from 0% to 41%) and Cu 2+ also participated in the redox reaction during the OER reaction. For the Co 2p spectrum shown in Fig.…”

“…Our group has performed numerous studies on the preparation and modification of CCO crystals and has continued to pursue the preparation of CuCoO 2 with smaller sizes and better OER catalytic activities. [12][13][14][15][16] To improve the catalytic activity of CCO catalysts, it is necessary to explore an effective synthesis strategy to modify the structure, composition, morphology, and properties of CCO crystals. Very recently, the complete implementation of MOFs as templates or reaction precursors for the preparation of porous transition metal oxides and other materials has demonstrated their great potential for energy and environmental applications.…”

CuCoO2/CuO heterostructure: understanding the role of band alignment in selective catalysis for overall water splitting

“…20,21 Furthermore, CuCoO 2 has shown great potential for use as a novel photocatalyst in water-splitting and pollutant degradation applications. 22,23 As an electrocatalyst, CuCoO 2 has been extensively studied for its water oxidation capabilities owing to its high electrocatalytic activity and thermodynamic stability in alkaline solution. 24 However, our previous research has highlighted certain drawbacks in the HER performance of CuCoO 2 due to its intricate band structure, which oen results in the recombination of photogenerated electron-hole pairs.…”

“…This prompted us to explore the in situ construction of CuCoO 2 / CuO heterostructures, building on previous work. 23 We conducted four performance tests, including photocatalytic water splitting, photocatalytic degradation of tetracycline hydrochloride (TCH), electrocatalysis and photoelectrochemistry, to demonstrate its improved catalytic activity and stability. To further scrutinize the microstructure and properties of the interface, density functional theory (DFT) calculations were performed to provide an in-depth analysis and explain the underlying mechanism of the enhanced performance and stability of the in situ constructed CuCoO 2 /CuO heterostructure.…”

“…24 However, our previous research has highlighted certain drawbacks in the HER performance of CuCoO 2 due to its intricate band structure, which often results in the recombination of photogenerated electron–hole pairs. 23 Moreover, it has been reported that the HER activity of CuCoO 2 is significantly lower than its oxygen evolution reaction (OER) activity, with noticeable decay, which makes the HER process extremely unstable. Thus, to overcome these challenges, the construction of a heterostructure has been proposed as a potential solution for designing CuCoO 2 -based catalysts.…”