Highly Efficient and Selective Visible‐Light Driven Photoreduction of CO₂ to CO by Metal–Organic Frameworks‐Derived NiCoO Porous Microrods

Abstract

Photocatalytic CO2 reduction by solar energy into carbonaceous feedstock chemicals is recognized as one of the effective ways to mitigate both the energy crisis and greenhouse effect, which fundamentally relies on the development of advanced photocatalysts. Here, the exploration of porous microrod photocatalysts based on novel NiCoO solid solutions derived from bimetallic metal–organic frameworks (MOFs) is reported. They exhibit overall enhanced photocatalytic performance with both high activity and remarkable selectivity for reducing CO2 into CO under visible‐light irradiation, which are superior to most related photocatalysts reported. Accordingly, the Ni0.2‐Co0.8‐O microrod (MR‐N0.2C0.8O) photocatalyst delivers high efficiency for photocatalytic CO2 reduction into CO at a rate up to ≈277 µmol g–1 h–1, which is ≈35 times to that of its NiO counterpart. Furthermore, they display a high selectivity of ≈85.12%, which is not only better than that of synthesized Co3O4 (61.25%) but also superior to that of reported Co3O4‐based photocatalysts. It is confirmed that the Co and Ni species are responsible for CO2CO conversion activity and selectivity, respectively. In addition, it is verified, by adjusting the Ni contents, that the band structure of NiCoO microrods can be tailored with favorable reduction band potentials, which thus enhance the selectivity toward CO2 photoreduction.

Highly Active Hydrogen‐rich Photothermal Reverse Water Gas Shift Reaction on Ni/LaInO3 Perovskite Catalysts with Near‐unity Selectivity

“…Each single wavelength catalytic result evidently exceeds the pure thermal catalysis and is practically identical to light absorption curve. And the correspondent apparent quantum efficiency (AQE) of 2 % Ni‐LaInO 3 at the monochromatic light of 405 nm reaches up to 3.77 % (Figure S4), which surpasses most reported analogical photocatalysts [7, 34, 35] …”

Enhanced toluene sensing performances over commercial Co3O4 modulated by oxygen vacancy via NaBH4-assisted reduction approach

“…8e and f), respectively. According to the relation among E CB , E VB and E g , 62 the calculated potentials of the conduction band levels for Co 3 O 4 and Co 3 O 4 -R-5 are −0.23 V and −0.22 V. Based on the above-mentioned results, the band alignments of the energy band structure for Co 3 O 4 and Co 3 O 4 -R-5 are shown in Fig. 9.…”

“…8e and f), respectively. According to the relation among E CB , E VB and E g , 62 energy band enters the valence band of Co 3 O 4 and connects with it, subsequently forming a new degenerate energy band. 63 Therefore, the decrease in band gap not only supports the presence of more oxygen vacancies, but also promotes the carrier transition.…”

Transition-Metal Single Atom Anchored on MoS2 for Enhancing Photocatalytic Hydrogen Production of g-C3N4 Photocatalysts

“…Figure d shows the EIS Nyquist plots of the g-C 3 N 4 NSs and SA-MoS 2 /g-C 3 N 4 photocatalysts, which were fitted by the equivalent circuit using ZSimpWin software. The calculated charge-transfer resistance (R ct ) values of Ru 1 –MoS 2 /g-C 3 N 4 , Co 1 –MoS 2 /g-C 3 N 4 , and Ni 1 –MoS 2 /g-C 3 N 4 photocatalysts are 549, 364, and 1015 kΩ, which are lower than that of g-C 3 N 4 NSs (4269 kΩ), manifesting that the SA-MoS 2 /g-C 3 N 4 photocatalysts have the most effective separation of photogenerated electrons and holes. , Consequently, the photocatalytic performance improvement of the SA-MoS 2 /g-C 3 N 4 photocatalysts can be attributed to the enhanced transfer efficiency of photogenerated carriers. It is worth noting that Ru 1 –MoS 2 /g-C 3 N 4 , Co 1 –MoS 2 /g-C 3 N 4 , and Ni 1 –MoS 2 /g-C 3 N 4 samples loaded with different TM single atoms show similar properties in the spectral and electrochemical characterization results, which further indicates that the loading of Ru, Co, and Ni single atoms has the same modification effect on the MoS 2 cocatalysts.…”