通过选择性添加 Zn2+ 对钼酸铋进行改性:一种用于太阳能驱动的水分离应用的高效光催化剂

IF 2.6 4区 化学 Q3 ELECTROCHEMISTRY
Swarnendu Baduri, Sangeeta Ghosh, Debasish Ray, Jitendra Kumar Singh, Han-Seung Lee, Chinmoy Bhattacharya
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引用次数: 0

摘要

研究了在光照下选择性添加金属以提高钼酸铋(BM)的水氧化能力。通过经济有效的滴注法,在导电玻璃基底上开发出了钼酸铋及其锌改性(不同原子%)光阳极。在 0.1 M Na2SO4 溶液(PBS,pH 值为 7)中,在 100 mW/cm2 的照明条件下,2% 的锌修饰样品在 1.3 V 对 Ag/AgCl 的应用电位下记录到的最大光电流为 240 µA/cm2。为了确定半导体的物理化学特性,还进行了表面表征,如扫描电子显微镜、X 射线衍射、能量色散 X 射线分析,以及光学分析,如紫外-可见吸收率、光致发光、傅立叶变换红外光谱和拉曼光谱分析。纯钼酸铋的光带隙为 2.78 eV,锌修饰样品的光带隙有所减小,优化样品的光带隙最小为 2.55 eV。XRD 分析还显示,在钼酸铋基体中加入锌后,随着组成金属氧化物比例的变化,晶体尺寸也会减小。Mott-Schottky 研究显示了半导体的 n 型性质,而 Nyquist 分析则表明 2% Zn-BMO 样品的电荷转移电阻最小。优化光阳极的 PEC 作用光谱表明,入射光子与电流的转换效率最高可达 34%,相应的吸收光子与电流的转换效率为 38%,是纯钼酸铋的三倍多。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Modifications of bismuth molybdates through selective additions of Zn2+: an efficient photocatalyst for solar-driven water splitting applications

Modifications of bismuth molybdates through selective additions of Zn2+: an efficient photocatalyst for solar-driven water splitting applications

Modifications of bismuth molybdates through selective additions of Zn2+: an efficient photocatalyst for solar-driven water splitting applications

The improvement of the water oxidation capability of bismuth molybdate (BM) with selective metal addition under illumination was examined. BM and its Zn-modified (different atomic %) photoanodes were developed over conducting glass substrate through the cost-effective drop-cast method. The maximum photocurrent of ~ 240 µA/cm2 at an applied potential of 1.3 V vs Ag/AgCl was recorded for the 2% Zn modified sample in 0.1 M Na2SO4 solution (PBS, pH 7) under 100 mW/cm2 illuminations. Surface characterizations like scanning electron microscopy, X-ray diffraction, energy dispersive X-ray analysis, and optical analysis such as UV–vis absorbance, photoluminescence, FT-IR, and Raman spectroscopic analyses were performed to determine the physicochemical properties of the semiconductor. The pure bismuth molybdate shows an optical band gap of ~ 2.78 eV, which decreases for the Zn-modified sample, and a minimum of 2.55 eV is detected for the optimized sample. The XRD analysis also reveals that Zn addition into the bismuth molybdate matrix decreases crystallite size with variation in proportions of the constituent metal oxides. The stability of the semiconductors regarding the PEC water oxidation reaction indicates promising results even under continuous illumination for 1 h. The Mott-Schottky study reveals the n-type nature of the semiconductors, whereas the Nyquist analysis indicates minimum charge transfer resistance for the 2% Zn-BMO sample. The PEC action spectra for the optimized photoanode indicate a maximum of 34% incident photon to current conversion efficiency with corresponding 38% absorbed photon to current conversion efficiency, which is more than three times than that of the pure bismuth molybdate.

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来源期刊
CiteScore
4.80
自引率
4.00%
发文量
227
审稿时长
4.1 months
期刊介绍: The Journal of Solid State Electrochemistry is devoted to all aspects of solid-state chemistry and solid-state physics in electrochemistry. The Journal of Solid State Electrochemistry publishes papers on all aspects of electrochemistry of solid compounds, including experimental and theoretical, basic and applied work. It equally publishes papers on the thermodynamics and kinetics of electrochemical reactions if at least one actively participating phase is solid. Also of interest are articles on the transport of ions and electrons in solids whenever these processes are relevant to electrochemical reactions and on the use of solid-state electrochemical reactions in the analysis of solids and their surfaces. The journal covers solid-state electrochemistry and focusses on the following fields: mechanisms of solid-state electrochemical reactions, semiconductor electrochemistry, electrochemical batteries, accumulators and fuel cells, electrochemical mineral leaching, galvanic metal plating, electrochemical potential memory devices, solid-state electrochemical sensors, ion and electron transport in solid materials and polymers, electrocatalysis, photoelectrochemistry, corrosion of solid materials, solid-state electroanalysis, electrochemical machining of materials, electrochromism and electrochromic devices, new electrochemical solid-state synthesis. The Journal of Solid State Electrochemistry makes the professional in research and industry aware of this swift progress and its importance for future developments and success in the above-mentioned fields.
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