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Buffer Assists Electrocatalytic Nitrite Reduction by a Cobalt Macrocycle Complex
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DOI：10.1021/acs.inorgchem.2c00909.png)
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摘要
En 中文
This work reports a combined experimental and computational study of the activation of an otherwise catalytically inactive cobalt complex, [Co(TIM)-Br2]+, for aqueous nitrite reduction. The presence of phosphate buffer leads to efficient electrocatalysis, with rapid reduction to ammonium occurring close to the thermodynamic potential and with high Faradaic efficiency. At neutral pH, increasing buffer concentrations increase catalytic current while simultaneously decreasing overpotential, although high concentrations have an inhibitory effect. Controlled potential electrolysis and rotating ring-disk electrode experiments indicate that ammonium is directly produced from nitrite by [Co(TIM)Br-2](+), along with hydroxylamine. Mechanistic investigations implicate a vital role for the phosphate buffer, specifically as a proton shuttle, although high buffer concentrations inhibit catalysis. These results indicate a role for buffer in the design of electrocatalysts for nitrogen oxide conversion.
Keyword:
IRON PORPHYRIN NITROSYLS
WATER OXIDATION
ELECTROCHEMICAL REDUCTION
BORATE BUFFER
NITRATE
AMMONIA
NITROGEN
REDOX
CATALYSIS
HYDROXYLAMINE
期刊
IF:
4.7
论文数:
4.9W
被引数:
10.5W
机构
引用论文
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ACS CATALYSIS
ACS CATALYSISIF13.1
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