Strong metal–support interaction in copper hexacyanoferrate nanocube decorated functionalized multiwall carbon nanotubes for enhanced bi-functional oxygen electrocatalytic activity and stability

Abstract

Development of an efficient non-precious metal-based bi-functional oxygen electro-catalyst for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is crucial for various electrochemical energy conversion and storage devices. Prussian...

Copper/Carbon Nanocomposites for Electrocatalytic Reduction of Oxygen to Hydrogen Peroxide

“…From Figure c, the Cu/C-700 sample can be observed to include a peak at 530.0 eV, due to oxygen in metal oxides (i.e., O–Cu), consistent with results from TEM measurements that the CuO and Cu 2 O species were formed in the sample (additional components at 531.3, 532.2, and 533.2 eV are due to OC, SO 4 2– , and O–C, respectively). − Interestingly, for the Cu/C-700 EC sample, whereas the OC, SO 4 2– , and O–C peaks remained virtually unchanged (with an additional peak at 535.4 eV corresponding to CF 2 –O–CF 2 of residual Nafion), the O–Cu peak actually shifted to a markedly higher binding energy (530.8 eV), again, confirming the formation of electron-deficient copper oxides. ,, Taken together, these results suggest that electrochemical activation led to effective enrichment of the Cu 2 O species on the nanocomposite surface . As Cu 2 O is far more active than CuO in catalyzing the 2e – ORR (Figure S12), the observed structural evolution is in excellent agreement with the enhanced selectivity of H 2 O 2 production with Cu/C-700 EC , as compared to Cu/C-700. − This can also account for the best ORR performance of Cu/C-700 among the three as-produced samples, as it possessed the highest Cu + concentration of 0.61 at %, in comparison to 0.35 at % for Cu/C-600 and 0.21 at % for Cu/C-800 (Figures S8b, S13, and S14 and Table S1).…”

Co-CNT/TiO2 composites effectively improved the photocatalytic degradation of malachite green

“…The end result is in settlement with the current types of C. In Fig. 2(e), the C 1s height at 284.6 eV is ascribed to C-C bonds of MWCNT; the height at 289.1 eV is assigned to COO bonds [23], which suggests the oxidized CNTs has ample of hydrophilic companies such as -COOH on the surface [24]. In the presence of Co (II), the Co 2p area feature two principal peaks (Fig.…”

A moisture-controlled Prussian white/CNT composite high energy cathode for next-generation sodium-ion batteries

“…Although CNTs do not contribute directly to any electrochemical redox reaction, the presence of an electrically conductive network connecting active particles promotes Na-ion diffusion, provides effective pathways and a larger number of electrochemically active sites for smooth battery operation. 4,14,25,38,[42][43][44][45][46][47] This leads to consistent charge storage properties and an improved redox reaction, and in combination with the least water content or a Na-rich lattice, it results in better reversibility of the PW-CNT composite compared with the PW electrode. Therefore, the synergistic effect of CNTs in the PW-CNT composite can exclusively control water content in the structure as well as improve the electrical conductivity, which corresponds to the improved redox reaction and hence high peak current observed in the CV data of the composite.…”