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18 maj 2021 · These results indicate Co/NC–N has a much better electrocatalytic ORR performance than Co(OH) 2 /NC, NC, NC–N and Co/NC–N–N, where the secondary-N-doping strategy and the synergistic effect of Co(OH) 2 supported on N-doped carbon are responsible for this enhanced performance.
strategy is developed for enhancing the ORR electrocatalytic performance of Co(OH) 2/NC, where NC is prepared from pyrolysis of carbon with melamine at 900 °C, then Co(OH) 2/NC is obtained from depositing Co(OH) 2 nanosheets on NC. The secondary-N-doping strategy is carried out by pyrolyzing Co(OH)
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14 sie 2020 · Because H 2 is a good reductant and O 2 is a good oxidant, this reaction has a very large equilibrium constant (K = 2.4 × 1047 at 500 K). Consequently, the equilibrium constant for the reverse reaction, the decomposition of water to form O 2 and H 2, is very small: K′ = 1 / K = 1 / (2.4 × 1047) = 4.2 × 10 − 48.
5 gru 2021 · To quantify the produced H 2 over NC/Ni-Mo-N/NF||NC/Ni-Mo-N/NF, electrolysis measurement was conducted with a cell voltage of 1.50 V for 2 h. The amount of H 2 generated experimentally is close to the theoretical calculation value ( Fig. 5 c), and the hydrogen evolution FE is as high as 99.7 %.
The progress of cost-effective bifunctional catalysts has become a critical issue to be solved. Here, we report that Co (OH) 2 @N-doped carbon (NC) was facilely synthesized through the impregnation strategy of metal-organic frameworks derived carbon and cobalt ions.
10 sie 2021 · OER performance of Co(OH) 2 @NC was studied by linear sweep voltammogram (LSV) tests in 1 M KOH solution. Co(OH) 2 @NC shows a potential of 1.56 V at 10 mA cm −2 (Fig. 3 (a)), compared with 1.65 V for ZIF-NC and 1.64 V for IrO 2 at 10 mA cm −2. The overpotential value of Co(OH) 2 @NC also surpasses other reported Co-based OER ...
