Incorporating nitrogen atoms into cobalt nanosheets as a strategy to boost catalytic activity toward CO2 hydrogenation

Improving Polysulfides Adsorption and Redox Kinetics by the Co4N Nanoparticle/N‐Doped Carbon Composites for Lithium‐Sulfur Batteries

“…These three samples contain the wide peaks of amorphous carbon located at 2‐theta values of 26°, 43°, and 53°, assigned to the carbon cloth and the MOF‐derived N‐doped carbon. Compared with the XRD profile of MOF‐Co, the characteristic reflections of MOF‐Co 4 N shifted to lower diffraction angles, suggesting the slight lattice expansion after N incorporates into Co lattice, which is consistent with previous report . High‐resolution TEM (HRTEM) (Figure S2c, Supporting Information) was also employed to confirm the crystallinity of Co 4 N, in which (110), (200), and (111) were found clearly.…”

“…To qualify the chemisorptive character and high affinity to LiPS of MOF‐Co 4 N, X‐ray photoelectron spectroscopy (XPS) analyses were performed on the MOF‐Co 4 N and MOF‐Co 4 N/S electrode at full discharge states as shown in Figure a. For the XPS of the MOF‐Co4N, it can be seen that the Co 2p 3/2 can be divided into characteristic peaks corresponding to metallic Co, CoN, and their relative satellite peaks in the initial stage, respectively . It is interesting to find that the peak of CoN is slightly blueshifted compared to that of CoN in pure Co 4 N structure reported previously, probably because of the electron transferred from Co to the doped N in the carbon matrix, causing larger polarization of Co in Co 4 N. This synergistic effect between Co and doped N can make contribution to the increased binding energy between Co 4 N and polysulfides.…”

Controllable Conversion of CO2on Non‐Metallic Gold Clusters

“…Thet hree gold clusters are capable of driving reaction pathways of CO 2 conversion towards different products, which implies different reaction mechanisms for the three catalysts.Therefore,the reaction intermediates formed in the three catalytic cycles were monitored by time-resolved in situ FT-IR spectroscopy.Asshown in Figure 5a,aseries of bands was observed:t he band at 1457 cm À1 assigned to OCO*; [31,39,40] the bands at 1630, 1868 and 2072 cm À1 assigned to HCO*, OH* and CO* species,r espectively. [41,42] Based on these results,t he reaction mechanism of CO 2 hydrogenation on the Au 9 catalyst was proposed:m ethane was produced through aH -assisted pathway,p ossibly via formyl (HCO*) and formaldehyde (H 2 CO*, 2921 cm À1 )s pecies to form surface CH x .F or the Au 11 reaction system (Figure 5b), two bands at 1457 and 1396 cm À1 were assigned to adsorbed OCO* species [31,39,40] and the band at 2060 cm À1 was assigned to CO* species adsorbed on gold. [43][44][45] IR bands at 2977 and 2892 cm À1 were also observed, which were assigned to u(CH).…”

Oxygen Vacancies in ZnO Nanosheets Enhance CO2 Electrochemical Reduction to CO

“…[4] As such, the effective activation of CO 2 plays ak ey role in CO 2 electrochemical reduction. [5] From both theoretical and experimental perspectives,t he electron transfer to CO 2 is generally considered as the critical step during the activation of CO 2 . [6,7] To overcome this bottleneck, it is especially important to rationally design ah ighly active and robust electrocatalyst which has electron-donation centers to capture CO 2 molecules and activate the stable C=On on-polar bonds.Recently,t he introduction of oxygen vacancies has provided ap owerful method to enhance the performance of CO 2 conversion in heterogenous catalysis by promoting CO 2 adsorption and activation.…”