Effects of hydrothermal treatment on the catalytic activity of cobalt-doped catalysts for oxygen reduction reaction

Nitrogen-doped graphene-supported Co/CoNx nanohybrid as a highly efficient electrocatalyst for oxygen reduction reaction in an alkaline medium

“…63 In addition, CoNx is more active than graphitic-N in catalyzing oxygen reduction. 64 For our fabricated Co-N G850 catalyst, XPS measurements show that the atomic percentage of N is only 0.76%; nevertheless, most of the N exist in the form of graphitic-N (50.13%) and pyridinic-N (35.32%). The TEM and XRD results demonstrate that the Co and CoNx crystalline structures coexist in the nanocrystals loaded on the N-doped graphene.…”

Prevention of active-site destruction during the synthesis of high performance non-Pt cathode catalyst for fuel cells

“…The Co/N-MPC(900/900) had higher specic surface area, but contained much less nitrogen than the Co/N-MPC(650/900), as presented in Table 1. Based on the reported binding energies of Co-N x , pyridinic-N, pyrrolic-N, graphitic-N, and pyridinic-N oxide (398.0, 398.5, 400.0, 401.1, and 403.0 eV, respectively), 26,[44][45][46][47] spectral deconvolution of N 1s core level spectrum was conducted, as shown in Fig. 4.…”

“…Co-N x , pyridinic-N, and graphitic-N were the active-sites for ORR. [47][48][49][50][51][52] Compared with the Co/N-MPC(650/900), the lower catalytic activity of the Co/N-MPC(900/900) (in Fig. 2) was attributed to the lower contents of Co-N x , pyridinic-N, and graphitic-N in the Co/N-MPC(900/900) ( Table 2), which suggests that higher CaCO 3 removal temperature led to a more severe destruction of the active N species.…”

A cobalt–pyrrole coordination compound as high performance cathode catalyst for direct borohydride fuel cells

“…Nowadays, non-Pt catalysts have attracted much attention owing to their great affordability and decent catalytic performance. 2 Numerous non-Pt ORR catalysts have been developed, including polyoxometalates, 3 metal oxides, 4 metal-macrocyclic compound, [5][6][7] metal doped polymers, 8,9 etc. High performance ORR catalyst requires high catalytic activity, including the intrinsic activity as well as the number of the active sites.…”