Indium Arsenide Quantum Dot Derived Catalyst for Selective CO2 Electrochemical Reduction to Formate,ACS Energy Letters

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Indium Arsenide Quantum Dot Derived Catalyst for Selective CO2 Electrochemical Reduction to Formate
ACS Energy Letters ( IF 19.3 ) Pub Date : 2024-02-21 , DOI: 10.1021/acsenergylett.4c00295
Fulvio Bellato _{1,

2,

3} , Michele Ferri ₁ , Dongxu Zhu ₁ , Thi-Hong-Hanh Le _{1,

2} , Abinaya Annamalai _{1,

2} , Martina Rizzo _{1,

4} , Irene Martin _{1,

4} , Luca Goldoni ₁ , Rosaria Brescia ₁ , Mirko Prato ₁ , Luca De Trizio ₁ , Ilka Kriegel _{1,

4} , Liberato Manna ₁

Affiliation

Despite a currently limited market size, formate is finding innovative applications as a hydrogen carrier and carbon source for upgrading processes to hydrocarbons and oxygenates. In this study, we combine the unique key features of In-based electrodes in the electrocatalytic CO₂ reduction reaction (e.g., limited hydrogen evolution reaction activity, near-to-unity carbon selectivity toward formate) with the remarkable results obtained using nanostructured and highly defective quantum dot derived catalysts. After developing a scalable, safe and cheap InAs quantum dots synthesis based on a mild and nonpyrophoric reducing agent (i.e., NaCNBH₃), a thorough voltammetric study allowed us to retrieve kinetic and thermodynamic data on their transformation into the actual catalytically active species (i.e., In⁰). In a flow electrolyzer operating under alkaline conditions at industrially relevant current densities, the catalyst achieved near-to-unity faradaic efficiency toward formate, with a remarkable production rate of ca. 1276 g_Formate h^–1 m^–2 at ca. −0.73 V vs RHE (η_Formate = 0.61 V).

中文翻译：

砷化铟量子点衍生催化剂用于选择性 CO2 电化学还原生成甲酸盐

尽管目前市场规模有限，但甲酸盐正在寻找作为氢载体和碳源的创新应用，用于将工艺升级为碳氢化合物和含氧化合物。在本研究中，我们将In基电极在电催化CO ₂还原反应中的独特关键特征（例如，有限的析氢反应活性、对甲酸盐的碳选择性接近于1）与使用纳米结构和高度纳米结构获得的显着结果相结合。有缺陷的量子点衍生催化剂。在开发出一种基于温和且不自燃的还原剂（即 NaCNBH ₃）的可扩展、安全且廉价的 InAs 量子点合成方法后，彻底的伏安研究使我们能够检索有关其转化为实际催化活性物质（即，在⁰）。在工业相关电流密度的碱性条件下运行的流动电解槽中，催化剂实现了接近于1的甲酸法拉第效率，具有约100 %的显着生产率。约1276 g_甲酸h ^–1 m ^–2 −0.73 V 与 RHE（η_甲酸= 0.61 V）。

更新日期：2024-02-21

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