Coordination environment dominated catalytic selectivity of photocatalytic hydrogen and oxygen reduction over switchable gallium and nitrogen active sites

Abstract

Catalytic properties of single-atom catalysts are very sensitive to the geometric interaction between metal sites and their supports. Their catalytic behavior is closely related to the local coordination environment of...

In Situ Introduction of NiSe2 to Nickel–Chromium Layered Double Hydroxides for Promotive Aqueous System Asymmetric Supercapacitors

“…C 1s spectra in the XPS results of Se-NiCr-LDHs-1 and NiCr-LDHs were analyzed and plotted (Figure d). For the C 1s fine spectrum of Se-NiCr-LDHs-1, the binding energies of the three key peaks in the fine spectrum are 295.87 eV (OC), 288.68 eV (C–O), and 284.80 eV (sp 2 carbon), respectively. , For the C 1s fine spectrum of NiCr-LDHs, the binding energies of the three key peaks in the fine spectrum are 288.85 eV (OC), 286.21 eV (C–O), and 284.80 eV (sp 2 carbon), respectively. − The carbon peak binding energy of Se-NiCr-LDHs-1 is increasing (moving in the direction of a higher binding energy) compared to NiCr-LDHs, which proves that there is electron transfer between NiCr-LDHs and NiSe 2 , which makes ion transfer of the electrolyte more flexible and the redox reaction more active. In the O 1s spectra of Se-NiCr-LDHs-1 and NiCr-LDHs (Figure e), the binding energy peaks of Se-NiCr-LDHs-1 and NiCr-LDHs with 531.38/531.52 eV as the center correspond to metal–oxygen bond vibration between main layer metals. , In comparison to the binding energy peak of NiCr-LDHs (O 1s), the binding energy peak of Se-NiCr-LDHs-1 was shifted (moved toward a lower binding energy), which enhanced the electrochemical reactivity of Se-NiCr-LDHs-1.…”

“…It is exciting that Se-NiCr-LDHs-1// AC ASC still has good magnification performance (70.93%) at a high current density (10 A g −1 ). The power density (1063, 2234, 6802, 9200, and 11545 W kg −1 ) and energy density(33,31,26,25, and 23 Wh kg −1 ) of Se-NiCr-LDHs-1//AC ASC are calculated on the basis of the data of the corresponding mass-specific capacitance and the discharge time of the GCD curves. In comparison to the summary of NiMn-LDH/porous carbon//AC ASC, S−NiV-LDHs//AC ASC, 4M-P@NiCo LDH//AC ASC, NiV-LDHs/GDY//AC ASC, and NiCo-LDHs@GDY//AC ASC,53,54,51,55,56 the Ragone graph of Se-NiCr-LDHs-1//AC ASC was produced (Figure5h).…”

Photocatalytic Degradation of Toluene by Three-dimensional Monolithic TiO2/Cu2O Heterojunction Foams

“…Fig. 4b shows the kinetic fit of the sample in simulated solar degradation of toluene according to pseudo-first-order kinetics: -ln(C/C0) = kt, where k is the reaction rate constant [31][32][33]. The results show that the photocatalytic degradation efficiency of 3D TiO2/Cu2O heterojunction foam for toluene under simulated sunlight is 2.98 and 2.26 times higher than that of pure TiO2 nanoparticles and the 3D Cu2O foams.…”

Recent progress in atomically precise metal nanoclusters for photocatalytic application

“…In addition, metal NCs with a precise composition, structure, and surface environment provide the opportunity to investigate in depth the catalytic mechanism and build the catalyst structure–property relationship. 2–5 A clear structure and high atom utilization are also the advantages of SACs; 6 however, there is no single atom in the true sense because a single atom cannot exist without a support. Besides, it is difficult to simultaneously activate multiple reactants by SACs to achieve high activity in a complex reaction.…”