2022
DOI: 10.1016/j.electacta.2022.141159
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Unraveling the formation of optimum point in NiCo-based electrocatalysts for urea oxidation reaction

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Cited by 11 publications
(7 citation statements)
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“…Previous studies described that the introduction of Co could reduce the nucleation barrier of Ni, inhibiting Ostwald ripening to avoid catalyst agglomeration for accelerating the reactant/product transfer rate. 41,42 Meanwhile, combining Ni and Co with different energy structures to construct heterogeneous catalysts could generate an internal electric field and induce the formation of oppositely charged regions, thus facilitating proton transport and accelerating reaction kinetics. 18 The corresponding Tafel slope of Co 0.5 NiS 2 −Ni 3 S 2 /NF (26.87 mV dec −1 ) is much smaller than those of NiCo 2 O 4 /NF (96.65 mV dec −1 ), Ni 3 S 2 /NF (29.79 mV dec −1 ), Co−S/NF (129.53 mV dec −1 ), Ni−S/NF (31.74 mV dec −1 ), and NF (129.39 mV dec −1 ).…”
Section: Resultsmentioning
confidence: 99%
“…Previous studies described that the introduction of Co could reduce the nucleation barrier of Ni, inhibiting Ostwald ripening to avoid catalyst agglomeration for accelerating the reactant/product transfer rate. 41,42 Meanwhile, combining Ni and Co with different energy structures to construct heterogeneous catalysts could generate an internal electric field and induce the formation of oppositely charged regions, thus facilitating proton transport and accelerating reaction kinetics. 18 The corresponding Tafel slope of Co 0.5 NiS 2 −Ni 3 S 2 /NF (26.87 mV dec −1 ) is much smaller than those of NiCo 2 O 4 /NF (96.65 mV dec −1 ), Ni 3 S 2 /NF (29.79 mV dec −1 ), Co−S/NF (129.53 mV dec −1 ), Ni−S/NF (31.74 mV dec −1 ), and NF (129.39 mV dec −1 ).…”
Section: Resultsmentioning
confidence: 99%
“…The voltammograms show that when using Co MOF-74@Ni as the electrode (Figure a), the reduction oxidation peak was not observed with and without the presence of urea. This result confirmed the inactive characteristic of cobalt for UOR as previously reported. , …”
Section: Resultsmentioning
confidence: 95%
“…However, since cobalt is inactive for urea oxidation process, a higher cobalt content can cause a decrease of the S / B ratios. The same phenomenon was also found when the nickel and cobalt particles were deposited at carbon electrodes, confirming that the presence of cobalt could lower the potential needed to oxidize urea. , Accordingly, the Ni:Co ratio of 4:1 was selected for further experiments.…”
Section: Resultsmentioning
confidence: 99%
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