Irina Kuznetsova, Dmitry Kultin, Olga Lebedeva, Sergey Nesterenko, Larisa Fishgoit, Alexander Leonov, Leonid Kustov
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The highest FE 58.7% and the largest yield rate of NH<sub>3</sub> 4.3 μmol h<sup>−1</sup> cm<sup>−2</sup> at potential − 0.585 V (RHE) in a neutral electrolyte for the Co75Si15Fe10 electrocatalyst for NO<sub>3</sub>RR. Unexpected for this work was the discovery of an inhibitory effect for an alloy containing a small amount of Cr. This work opens up interesting opportunities for further research of multicomponent alloys for NO<sub>3</sub>RR.</p><h3>Graphical Abstract</h3><p>The multicomponent alloys electrocatalysts of Co75Si15Fe10 and Co75Si15Fe5Cr5 were synthesized. The eco-friendly electrocatalytic nitrate reduction reaction at ambient condition was used. Ammonia was synthesized by NO<sub>3</sub>RR and the yield rate of NH<sub>3</sub> = 4.3 μmol h<sup>−1</sup> cm<sup>−2</sup>. 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引用次数: 0
摘要
环境条件下的生态友好型电催化硝酸还原反应（NO3RR）作为Haber-Bosch工艺的潜在替代品和高效废水处理的需求很大。合成了Co75Si15Fe10和Co75Si15Fe5Cr5两种非贵金属多组分合金电催化剂。采用SEM、EDX、XRD、UV-vis光谱、线性伏安法、时安培法和电化学阻抗法对样品进行了表征和研究。在计时电流法条件下，用硝酸还原法合成氨，得到了氨的法拉第效率（FE）和NH3的产率。在- 0.585 V （RHE）电位下，Co75Si15Fe10 NO3RR电催化剂的FE最高为58.7%，NH3产率最高为4.3 μmol h−1 cm−2。出乎意料的是，这项工作发现了对含有少量Cr的合金的抑制作用。这项工作为进一步研究多组分NO3RR合金开辟了有趣的机会。摘要合成了Co75Si15Fe10和Co75Si15Fe5Cr5多组分合金电催化剂。采用环境条件下的生态友好型电催化硝酸还原反应。NO3RR合成氨，NH3产率为4.3 μmol h−1 cm−2。电势下的法拉第效率FE = 58.7%, E = - 0.585 V （RHE）。
Multicomponent Alloys Based on CoSi in the Electrochemical Reaction of Nitrate Reduction to Ammonia
The eco-friendly electrocatalytic nitrate reduction reaction (NO3RR) at ambient condition is in high demand as a potential replacement for the Haber–Bosch process and for efficient wastewater treatment. The two multicomponent alloys electrocatalysts based on non-noble metals of Co75Si15Fe10 and Co75Si15Fe5Cr5 were synthesized. The samples were characterized and studied by the SEM, EDX, XRD, UV–vis spectroscopy, linear voltammetry, chronoamperometry, and electrochemical impedance spectroscopy. Under the conditions of chronoamperometry, ammonia was synthesized by NO3RR and the values of Faradaic efficiency (FE) and yield rate of NH3 were obtained. The highest FE 58.7% and the largest yield rate of NH3 4.3 μmol h−1 cm−2 at potential − 0.585 V (RHE) in a neutral electrolyte for the Co75Si15Fe10 electrocatalyst for NO3RR. Unexpected for this work was the discovery of an inhibitory effect for an alloy containing a small amount of Cr. This work opens up interesting opportunities for further research of multicomponent alloys for NO3RR.
Graphical Abstract
The multicomponent alloys electrocatalysts of Co75Si15Fe10 and Co75Si15Fe5Cr5 were synthesized. The eco-friendly electrocatalytic nitrate reduction reaction at ambient condition was used. Ammonia was synthesized by NO3RR and the yield rate of NH3 = 4.3 μmol h−1 cm−2. The Faradaic efficiency, FE = 58.7% at potential, E = − 0.585 V (RHE).
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