Iron clusters regulate local charge distribution in Fe-N4 sites to boost oxygen electroreduction

Converting carbon black into an efficient and multi-site ORR electrocatalyst: the importance of bottom-up construction parameters

“…On the other hand, they support the hypothesis that the enhanced ORR performance of Fe 0.06 –N@BP can indeed be ascribed to the presence of single-atom Fe–N active sites surrounded by Fe nanoclusters (Fig. 4e and h), 31 to the active N in the matrix ( i.e. , N6 and NQ species), 19,20 and to the strong oxygen adsorption capability of the small pore system.…”

“…Moreover, Fe nanoclusters near the single-atom Fe–N centers were recently shown to regulate the local charge distribution in those sites and thus to enhance their electrocatalytic activity towards the ORR. 31 Therefore, the Fe nanoclusters existing on Fe 0.06 –N@BP (Fig. 4e and h) are expected to be beneficial.…”

“…4e and h) are expected to be beneficial. 31 Taking also into account that all the Fe–N-modified carbon black electrocatalysts reveal similar textural features (Fig. S7, S8, S13, and S14, and Tables S5 and S9†), it can be concluded that active centers composed of the N-coordinated Fe atoms surrounded by the Fe nanoclusters play the major role towards the ORR performance achieved by Fe 0.06 –N@BP when compared to those of other carbon black electrocatalysts considered in this study, including Fe–N@BP ( i.e.…”

“…The results herein reported were compared to those published in the 10 latest publications on the application of carbon materials enriched with Fe–N–C active sites for the ORR in basic media (Table S12†). 31–40 The very different experimental conditions employed render difficult a fair comparison. In fact, this is a common issue that might negatively affect developments in ORR electrocatalysts.…”

SnO2/CoS1.097 heterojunction as a green electrocatalyst for hydrogen evolution linking to assistant glycerol oxidation

“…S11†), suggesting that the 0.5SnO 2 /0.5CoS 1.097 has the largest ECSA, corresponding to the highest activity, which also well explains the best electrocatalytic performances of 0.5SnO 2 /0.5CoS 1.097 amongst the heterojunctions. 40…”