A 2D layered cobalt-based metal–organic framework for photoreduction of CO₂to syngas with a controllable wide ratio range

Abstract

Photocatalytic CO2 reduction into syngas (a mixture of CO and H2) with adjustable composition is a prospective way to mitigate the energy shortage and the greenhouse effect. Herein, we synthesize...

Facile Synthesis of Enzyme-Mimicking Cobalt-Polyphenol Coordination Network for Oxidation of Phenolic Pollutants

“…The wide range XPS survey spectrum indicates the presence of C, O, and Co (Figure B) which is consistent with the result obtained from the EDX. Additionally, in the high-resolution XPS spectrum of Co 2p (Figure C), the characteristic peaks with binding energies of ∼781.3 and ∼797.2 eV correspond to Co 2p 3/2 and Co 2p 1/2 , respectively, and the spin–orbital splitting (Co 2p 3/2 –Co 2p 1/2 ) value of 15.9 eV collectively indicates the presence of high spin Co­(II) with octahedral arrangement. − Previous studies suggest that the oxidation state of the species can also be assessed by the information collected from the position of satellite peaks. The energy gap between the main peak and the corresponding satellite peak serves as an important standard to estimate the valence state of Co. , The +2 and +3 oxidation state of Co is associated with the energy gap value of ∼6 eV and around 9–10 eV, respectively.…”

Catalysis with Two‐Dimensional Metal‐Organic Frameworks: Synthesis, Characterization, and Modulation

“…[112] It is worth mentioning that changes in metal nodes not only affected the photocatalytic performance of CO 2 but also influenced the types of catalytic products. [29,220,221] For instance, Li's group reported that the incorporation of Cu and Zr into 2D Ni-BDC MOFs significantly enhanced the catalytic performance and promoted the conversion of CO 2 to liquid methanol and ethanol. [29] As depicted in Figure 16, the as-synthesized NiCrCu-BDC displayed a high formation rate of liquid methanol and ethanol, reach-ing 41.05 and 36.62 μmol h −1 g −1 , respectively.…”

2D photosensitive porphyrin-based MOFs integrated with a Pd cocatalyst with fast charge transfer for efficient photocatalytic hydrogen evolution

“…of MOFs, among which Co usually shows significant advantages in energy conversion and storage, especially in hydrogen production. 31,32 Therefore, in our work, by embedding Pd(II) tetrakis(4carboxyphenyl)porphyrin (PdTCPP) as the organic linker and various metal clusters as metal nodes (Co, Cu, Cd, Zn), we engineered a series of robust and efficient ultrathin porphyrin-based MOF (M-TCPP(Pd)) nanosheets (Scheme 1). In the as-prepared photocatalysts, Co-TCPP(Pd) exhibits an excellent photocatalytic hydrogen production performance (4.40 mmol g −1 h −1 ) with ascorbic acid as sacrificial agents under visible light illumination.…”