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Nanomaterials 2020, 10, 1407 11 of 26 Electrocatalyst Pd-N-B-CNHs Pt/CNHs Pt/N-CNHs CoSe2/N-CNHs CNHs/MOF N-Fe-doped CNH Co-g-C3 N4 /CNHs g-N-CNHs Pt/CNHs Pt/CNHs Reaction/Conditions ORR/ LSV in 0.1 M KOH - ORR/ LSV in 0.1 M HClO ORR/ LSV in 0.1 M KOH ORR/ LSV in 0.1 M KOH ORR/ LSV in 0.1 M KOH ORR/ LSV in 0.1 M KOH ORR-H2O2 production/CV-LSV in 0.1 M NaOH ORR-H2O2 production/CV-LSV in 0.1 M phosphate buffer solution ORR-H2O2 production/CV-LSV in 0.1 M H2SO4 ORR/ CV in 0.5 M H2SO4 ORR/ LSV in 0.5 M H2SO4 Table 1. Cont. ORR Performance Onset potential: −0.01 V vs. SCE Half-wave potential: −0.152 V vs. SCE JD: ~−5.8 mA cm−2 at 1600 rpm Electron transfer number: 4.2 Durability: 4.7% current loss after 9000 s - Onset potential: ~1.0 V vs. RHE Half-wave potential: 0.904 V vs. RHE JD: ~−5.5 mA cm−2 at 1600 rpm ** Jk: 2.15 mA cm−2 at 1600 rpm Maximum Power Density - 2.5 mW/cm2 - 10.05 mW/cm/2 185 mW/cm2 35 mW/cm2 - - - - Ref. [86] [92] [95] [102] [103] [107] [108] [111] [121] [122] Mass activity: 0.305 A mg −1 at 0.9 V vs. RHE 4 Pt Durability: half-wave potential 0.902 V vs. RHE after 15,000 cycles, Jk: 2.09 mA cm−2 at 1600 rpm after 15,000 cycles Onset potential: 0.9 V vs. RHE Half-wave potential: 0.81 V vs. RHE JD: ~−5.2 mA cm−2 at 1600 rpm Jk: 8.08 mA cm−2 at 1600 rpm Mass activity: 13.8 A g−1 Electron transfer number: 4 Tafel slope: 52 mV decade−1 Durability: negligible losses for onset and half-wave potential after 2000 cycles Onset potential: 0.97 V vs. RHE Half-wave potential: 0.87 V vs. RHE JD: ~−5.0 mA cm−2 at 1600 rpm Electron transfer number: ~3.7 Durability: 7% loss of current density after 12h operation Onset potential: −0.09 V vs. Hg/HgO Half-wave potential: −0.026 V vs. Hg/HgO JD: ~−3.8 mA cm−2 at 1600 rpm Electron transfer number: 4 Tafel slope: 84 mV decade−1 Durability: Almost unchanged activity Onset potential: −0.066 V vs. Ag/AgCl Half-wave potential: −0.157 V vs. Ag/AgCl JD : ~−4.8 mA cm−2 at 1600 rpm Electron transfer number: 3.98 Durability: negligible activity loss after 12 h operation Onset potential: 0.71 V vs. RHE Peak potential: 0.40 V vs. RHE Peak current density: −2.3 mA cm−2 Tafel slope: 71 mV decade−1 Electron transfer number: 3.1 Onset potential: 0.53 V vs. RHE Peak potential: 0.59 V vs. RHE Peak current density: −1.79 mA cm−2 Tafel slope: 84 mV decade−1 Electron transfer number: 2.1 Onset potential: 0.40 V vs. RHE Peak potential: 0.18 V vs. RHE Peak current density: −3.6 mA cm−2 Tafel slope: 95 mV decade−1 Electron transfer number: 2.4 Peak potential: 0.33 V vs. Ag/AgCl Onset potential: 0.77 V vs. Ag/AgCl Half-wave potential: 0.67 V vs. Ag/AgCl Current density: 34.54 mAcm−2 Mass activity: 50.06 mA mg −1 Pt * JD—diffusion limited current density; ** Jk—kinetic current density.PDF Image | Carbon Nanohorn-Based Electrocatalysts for Energy Conversion
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