Electrochemical Reduction of CO2 in a Zero-Gap Electrolyzer Cell on a Metal Molecular Electrocatalyst.

IF 2.5 4区 化学 Q2 CHEMISTRY, MULTIDISCIPLINARY
Simphiwe L Ndlangamandla, Shankara G Radhakrishnan
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引用次数: 0

Abstract

Electrochemical reduction of CO2 (ECR) on transition metal-containing porphyrin systems often leads to carbon monoxide. Herein, a modified zero-gap polymer electrolyte membrane water electrolyzer is used with 5,10,15,20-tetraphenyl-21H,23H-porphine copper (II) as a cathodic electrocatalyst for ECR in 0.1 M NaOH as an aqueous catholyte. The setup yields CO, CH4, and C2H4 along with hydrogen evolution, with selectivity toward C2H4 formation as indicated by gas chromatographic analysis. Although hydrogen formation is predominant, the system yields a high average current density of 146.94 mA cm-2 and a Tafel slope of ≈226 mV dec-1 in concurrence. The cyclic voltammetric experiments show the stepwise formation of Cu (II) → Cu (I) → Cu (0) based on the potentials referenced against the reversible hydrogen electrode, which could have been the driving factor for the ECR.

金属分子电催化剂上零间隙电解槽中CO2的电化学还原。
在含过渡金属卟啉体系上电化学还原CO2 (ECR)往往会产生一氧化碳。在0.1 M NaOH水溶液中,采用5,10,15,20-四苯基- 21h, 23h -卟啉铜(II)作为ECR的阴极电催化剂,设计了一种改进的零间隙聚合物电解质膜式电解器。气相色谱分析表明,该装置在析氢过程中产生CO、CH4和C2H4,并有选择性地生成C2H4。虽然氢的形成占主导地位,但该体系同时产生146.94 mA cm-2的高平均电流密度和≈226 mV dec1的Tafel斜率。循环伏安实验表明,基于对可逆氢电极的参考电位,Cu (II)→Cu (I)→Cu(0)逐步形成,这可能是ECR的驱动因素。
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来源期刊
ChemistryOpen
ChemistryOpen CHEMISTRY, MULTIDISCIPLINARY-
CiteScore
4.80
自引率
4.30%
发文量
143
审稿时长
1 months
期刊介绍: ChemistryOpen is a multidisciplinary, gold-road open-access, international forum for the publication of outstanding Reviews, Full Papers, and Communications from all areas of chemistry and related fields. It is co-owned by 16 continental European Chemical Societies, who have banded together in the alliance called ChemPubSoc Europe for the purpose of publishing high-quality journals in the field of chemistry and its border disciplines. As some of the governments of the countries represented in ChemPubSoc Europe have strongly recommended that the research conducted with their funding is freely accessible for all readers (Open Access), ChemPubSoc Europe was concerned that no journal for which the ethical standards were monitored by a chemical society was available for such papers. ChemistryOpen fills this gap.
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