Enhanced photoelectrochemical CO2 reduction activity towards selective generation of alcohols over CuxO/SrTiO3 heterojunction photocathodes

IF 6.3 2区材料科学 Q2 ENERGY & FUELS

Solar Energy Materials and Solar Cells Pub Date : 2024-10-14 DOI:10.1016/j.solmat.2024.113203

Guguloth Venkanna , Sovan Kumar Patra , Gajanan U. Kapure , Kamal Kishore Pant

{"title":"Enhanced photoelectrochemical CO2 reduction activity towards selective generation of alcohols over CuxO/SrTiO3 heterojunction photocathodes","authors":"Guguloth Venkanna , Sovan Kumar Patra , Gajanan U. Kapure , Kamal Kishore Pant","doi":"10.1016/j.solmat.2024.113203","DOIUrl":null,"url":null,"abstract":"<div><div>Photoelectrochemical reduction (PECR) of CO2 to value-added chemicals and fuels will reduce the dependency on fossil fuels, also it will solve environmental issues that arise due to greenhouse gases. A heterojunction of CuxO/SrTiO3 with varying post-annealing temperature ranges from 300 to 600 °C (CS300-600) was synthesized by overlying the spin-coated SrTiO3 on electrodeposited Cu2O over the FTO glass substrate. The synthesized photoelectrode's crystallinity and phase formation significantly varied by varying the post-annealing temperature, which was characterized via XRD and Raman spectroscopy. Optical, morphological, type of heterojunction formation and elemental surface oxidation states of photoelectrodes were studied through UV–visible DRS spectrum, FE-SEM, and XPS analysis respectively. Electrocatalytic analysis such as Linear Sweep Voltammetry (LSV), and Electrochemical Impedance Spectrometry (EIS) was employed, thus it conforms to the highest photocurrent density (−1.38 mA/cm2 at −0.6V vs. Ag/AgCl), and low charge transfer resistance (RCT=0.412 kΩ) at the electrode-electrolyte interfaces for CS500 photoelectrode as compared to others photoelectrodes. PECR of CO2 to liquid product formation was evaluated by applying different potential ranges (0 to −0.6 V vs. Ag/AgCl). Highest methanol formation of 48.69 μmol.cm−2hr−1, which is approximately 9 times enhanced as compared to the pure Cu2O (5.62 μmol.cm−2hr−1) photoelectrode at 0 V vs Ag/AgCl for CS500 heterojunction. Optimization of overlaying SrTiO3 synthesis temperature for crystallization formation on Cu2O and applied photoelectrode potential findings could pave the way for designing other new heterojunction types for selective liquid alcohol production.</div></div>","PeriodicalId":429,"journal":{"name":"Solar Energy Materials and Solar Cells","volume":"278 ","pages":"Article 113203"},"PeriodicalIF":6.3000,"publicationDate":"2024-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Solar Energy Materials and Solar Cells","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0927024824005154","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENERGY & FUELS","Score":null,"Total":0}

引用次数: 0

Abstract

Photoelectrochemical reduction (PECR) of CO₂ to value-added chemicals and fuels will reduce the dependency on fossil fuels, also it will solve environmental issues that arise due to greenhouse gases. A heterojunction of Cu_xO/SrTiO₃ with varying post-annealing temperature ranges from 300 to 600 °C (CS300-600) was synthesized by overlying the spin-coated SrTiO₃ on electrodeposited Cu₂O over the FTO glass substrate. The synthesized photoelectrode's crystallinity and phase formation significantly varied by varying the post-annealing temperature, which was characterized via XRD and Raman spectroscopy. Optical, morphological, type of heterojunction formation and elemental surface oxidation states of photoelectrodes were studied through UV–visible DRS spectrum, FE-SEM, and XPS analysis respectively. Electrocatalytic analysis such as Linear Sweep Voltammetry (LSV), and Electrochemical Impedance Spectrometry (EIS) was employed, thus it conforms to the highest photocurrent density (−1.38 mA/cm² at −0.6V vs. Ag/AgCl), and low charge transfer resistance (R_CT=0.412 kΩ) at the electrode-electrolyte interfaces for CS500 photoelectrode as compared to others photoelectrodes. PECR of CO₂ to liquid product formation was evaluated by applying different potential ranges (0 to −0.6 V vs. Ag/AgCl). Highest methanol formation of 48.69 μmol.cm⁻²hr⁻¹, which is approximately 9 times enhanced as compared to the pure Cu₂O (5.62 μmol.cm⁻²hr⁻¹) photoelectrode at 0 V vs Ag/AgCl for CS500 heterojunction. Optimization of overlaying SrTiO₃ synthesis temperature for crystallization formation on Cu₂O and applied photoelectrode potential findings could pave the way for designing other new heterojunction types for selective liquid alcohol production.

查看原文本刊更多论文

在 CuxO/SrTiO3 异质结光电阴极上增强光电化学二氧化碳还原活性以选择性生成醇类

将二氧化碳光电化学还原（PECR）为高附加值的化学品和燃料将减少对化石燃料的依赖，同时还能解决因温室气体而产生的环境问题。通过在 FTO 玻璃基底上的电沉积 Cu2O 上覆盖旋涂 SrTiO3，合成了退火后温度范围在 300 到 600 ℃ 之间的 CuxO/SrTiO3 异质结（CS300-600）。通过 XRD 和拉曼光谱对合成光电极的结晶度和相的形成进行了表征。通过紫外可见 DRS 光谱、FE-SEM 和 XPS 分析分别研究了光电极的光学、形态、异质结形成类型和元素表面氧化态。通过线性扫频伏安法（LSV）和电化学阻抗谱法（EIS）等电催化分析，与其他光电极相比，CS500 光电极具有最高的光电流密度（-0.6V 时-1.38 mA/cm2 对 Ag/AgCl）和电极-电解质界面上较低的电荷转移电阻（RCT=0.412 kΩ）。通过使用不同的电位范围（0 至 -0.6 V，相对于 Ag/AgCl）评估了二氧化碳到液体产物形成的 PECR。与纯 Cu2O（5.62 μmol.cm-2hr-1）光电电极相比，CS500 异质结在 0 V 对 Ag/AgCl 时的甲醇生成量最高，为 48.69 μmol.cm-2hr-1，提高了约 9 倍。优化在 Cu2O 上形成结晶的 SrTiO3 层叠合成温度和应用光电极电位的研究结果，可为设计其他新型异质结以选择性生产液体酒精铺平道路。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Solar Energy Materials and Solar Cells 工程技术-材料科学：综合

CiteScore

12.60

自引率

11.60%

发文量

513

审稿时长

47 days

期刊介绍： Solar Energy Materials & Solar Cells is intended as a vehicle for the dissemination of research results on materials science and technology related to photovoltaic, photothermal and photoelectrochemical solar energy conversion. Materials science is taken in the broadest possible sense and encompasses physics, chemistry, optics, materials fabrication and analysis for all types of materials.