Hugo L. S. Santos, Leticia S. Bezerra, Pedro H. C. Camargo, Lucia H. Mascaro
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引用次数: 0
摘要
尽管三氧化钨（WO3）具有光化学和光电化学应用的潜力，但由于其宽的带隙和快速的载流子重组，它存在局限性。在这里，通过加入富含缺陷的MoO3-x纳米片，WO3薄膜的光电化学性能得到了提高。WO3薄膜采用简单的聚合物辅助沉积（PAD）方法制备，随后通过滴铸法制备了富含缺陷的MoO3-x纳米片。电镜结果显示，WO3呈现出一种凝聚的纳米球状结构，其中有几个裂缝，其中MoO3-x纳米片被锚定。在光电化学性能方面，最佳WO3/MoO3-x薄膜在太阳模拟器和LED 427 nm光照下的光电流密度分别为1.30±0.12 mA cm - 2和3.20±0.2 mA cm - 2，是裸WO3光电流密度的两倍。这种增强的性能归因于II型异质结的形成，这有利于更有效的电荷载流子分离，以及MoO3-x对析氧反应的催化增强。
Tailoring WO3 photoelectrodes with defect-rich MoO3-x nanosheets for efficient water splitting reaction
Despite its potential for photochemical and photoelectrochemical applications, tungsten trioxide (WO3) presents limitations due to its wide bandgap and rapid charge carrier recombination. Here, the photoelectrochemical performance of WO3 films were enhanced by incorporating defect-rich MoO3-x nanosheets. The WO3 films were produced using a simple polymer-assisted deposition (PAD) method and subsequently modified with defect-rich MoO3-x nanosheets, prepared via solvothermal synthesis, by drop-casting. Electronic microscopy revealed that WO3 exhibited an agglomerated nano-globular structure with several fissures where the MoO3-x nanosheets were anchored. In terms of photoelectrochemical performance, the optimal WO3/MoO3-x film exhibited photocurrent densities of 1.30 ± 0.12 mA cm−2 and 3.20 ± 0.2 mA cm−2 under solar simulator and LED 427 nm illumination, respectively, doubling the photocurrent density of bare WO3. This enhanced performance was attributed to the formation of a type II heterojunction, which facilitates more efficient charge carrier separation and due to the catalytic enhancement for the oxygen evolution reaction provided by MoO3-x.
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.
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