Effective electrocatalytic conversion of CO2 to CO on CoO-NC supported iron oxide heterostructure

IF 5.5 3区材料科学 Q1 ELECTROCHEMISTRY

Electrochimica Acta Pub Date : 2024-12-28 DOI:10.1016/j.electacta.2024.145575

Shayan Gul, Fatima Nasim, Muhammad Amtiaz Nadeem, Muhammad Imran, Amir Waseem, Muhammad Arif Nadeem

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引用次数: 0

Abstract

Electrocatalytic CO₂ reduction reaction (eCO₂RR) generates valuable chemical feedstocks but exhibits slow kinetics due to its proton-coupled electron transfer (PCET) process. Transition metal oxides, including iron oxides (FeO) and cobalt oxides (CoO), are economically feasible, non-toxic, and widely accessible materials for various electrochemical applications. Yet, they demonstrate near inactivity in eCO₂RR. Our study reveals a notable boost in the activity and selectivity of FeO to reduce CO₂ to CO when it is supported on cobalt oxide embedded nitrogen doped carbon nanotubes (CoO-NC). By varying the concentration of FeO, a series of FeO based electrocatalysts has been synthesized. The optimum ratio denoted as FeO/CoO-NC(0.16) exhibits a significant current density (j) of 38 mAcm^-2 which is 3.8 times greater when FeO is deposited over commercial multiwalled carbon nanotubes (FeO/MWCNTs). Moreover, FeO/CoO-NC(0.16) shows a remarkably lower overpotential (η) of only 0.251 V_RHE than FeO/MWCNTs (0.446 V_RHE). The Faraday efficiency (FE) for electrocatalytic CO₂ to CO conversion on the surface of FeO/CoO-NC(0.16) reaches ≈ 79% at −0.70 V_RHE which is quantitively monitored by a GC-TCD. The present study offers a new avenue for the use of Fe as an efficient candidate for eCO₂RR.

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CO - nc负载氧化铁异质结构上CO2到CO的有效电催化转化

电催化CO2还原反应（eCO2RR）产生有价值的化学原料，但由于其质子耦合电子转移（PCET）过程而表现出缓慢的动力学。过渡金属氧化物，包括氧化铁（FeO）和钴氧化物（CoO），是一种经济可行、无毒、广泛可及的材料，可用于各种电化学应用。然而，它们在eCO2RR中几乎不活跃。我们的研究表明，当FeO负载在钴氧化物包埋的氮掺杂碳纳米管（CO - nc）上时，FeO将CO2还原为CO的活性和选择性显著提高。通过改变FeO的浓度，合成了一系列FeO基电催化剂。最佳比率为FeO/CoO-NC(0.16)，其电流密度(j)为38 mAcm-2，是商业多壁碳纳米管（FeO/MWCNTs）上沉积FeO的3.8倍。此外，FeO/ co - nc（0.16）的过电位（η）仅为0.251 VRHE，明显低于FeO/MWCNTs （0.446 VRHE）。在−0.70 VRHE下，FeO/ CO - nc（0.16）表面电催化CO2转化为CO的法拉第效率（FE）达到了≈79%，并通过GC-TCD进行了定量监测。本研究为利用铁作为eCO2RR的有效候选物提供了新的途径。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Electrochimica Acta 工程技术-电化学

CiteScore

11.30

自引率

6.10%

发文量

1634

审稿时长

41 days

期刊介绍： Electrochimica Acta is an international journal. It is intended for the publication of both original work and reviews in the field of electrochemistry. Electrochemistry should be interpreted to mean any of the research fields covered by the Divisions of the International Society of Electrochemistry listed below, as well as emerging scientific domains covered by ISE New Topics Committee.