APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
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2025
·Vol. 131
·期 1
·1-16
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IF 2.8
Zheng Guangwei,Jiang Shukang,Zhang Fengqing,Yu Hongwen,Zhang Yanli L.
Choosing suitable photoanode materials is the most critical aspect for photoelectrochemical (PEC) water splitting. The low efficiency of PEC water splitting photoanodes restricts their widespread application for large-scale H 2 production. Herein, we prepared WO 3 photoanodes with controllable structures via hydrothermal-electrophoretic deposition and seed-mediated hydrothermal synthesis, achieving ex situ assembly and in situ growth on FTO glass substrates. Under simulated sunlight irradiation, the photoelectric current density of the WO 3 photoanode prepared by in situ hydrothermal synthesis exceeds 1.0 mA/cm² (at 1.23 V vs. RHE), significantly higher than that of the WO 3 photoanode prepared by ex situ assembly (which is less than 0.3 mA/cm² at 1.23 V vs. RHE). By contrast, the in situ preparation of the WO 3 photoanode using tungsten powder and H 2 O 2 as raw materials exhibits the enhanced photocurrent density of 1.27 mA/cm² at 1.23 V vs. RHE. The excellent PEC performance of the resulting sample could be attributed to the ordered charge transport channels from the two-dimensional (2D) nanoplates structure, the enhanced electron-hole pairs separation from the superior crystallinity of WO 3 and the strong binding between the WO 3 nanoplates and the FTO substrate. Additionally, the effect of calcination temperature on the PEC performance of the prepared WO 3 was further investigated. This work provides a way for the synthesis of environmentally friendly and cost-effective photoanodes for efficient photoelectrochemical water splitting.
研究领域:
材料科学
·
能源科学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Junsen Zhong,Bingkun Huang,Jianxin Song,Xiaolong Zhang,Lingyu Du,Yanfeng Gao,Wei Liu,Litao Kang
As the best-known and extensively-studied electrochromic material, tungsten trioxide (WO 3 ) has drawn tremendous interest due to its low material cost, environmental benignity, dual band regulation, high optical modulation, and high chemical stability. However, these films always suffer from ion-trapping-induced degradation in electrochromic performance when cycled in alkali cation (such as Li + , Na + , K + , etc.) electrolytes. Herein, we report a stable WO 3 electrochromic system enabled by a NH 4 CF 3 SO 3 -TEP (Triethyl phosphate) organic electrolyte. Based on comparative experiments and systematic characterizations, the prolonged cycling stability is mainly attributed to the formation of hydrogen bonds between the NH 4 + ions and the WO 3 lattice, which are much weaker than metallic coordination bonds. Furthermore, the bulky CF 3 SO 3 − anion and large TEP solvent molecule are also favorable to stabilize WO 3 , since they are more resistive to be co-inserted into the WO 3 lattice along with the shuttling NH 4 + cations. Thanks to these merits, this NH 4 CF 3 SO 3 -TEP electrolyte simultaneously enables great electrochromic activity (76.1 % transmittance modulating ability at 633 nm) and impressive cyclic color-switching stability (1000 times color change without any detectable electrochromic performance or mechanical degradation), overwhelmingly outperforming the conventional Li + /K + electrolytes. Furthermore, as a demonstration of its application, a WO 3 /Zn electrochromic device is fabricated based on a NH 4 + /Zn 2+ -CF 3 SO 3 dual-cation TEP electrolyte. These findings may shed light on the in-depth understanding of WO 3 ′s “ion trapping” effect, as well as the electrolyte design of high-performance WO 3 -based electrochromic devices.
研究领域:
材料科学
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电化学
·
光电
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
·
2013
·
IF 3.187
Yueling Cao,Junwei Wang,Maoqing Kang,Yulei Zhu
Ni–WO 3 /SBA-15 catalysts were prepared by an impregnation way and applied to the hydrogenolysis of cellulose in aqueous solution. The effect of nickel and WO 3 loading, catalysts reduction temperature and time on cellulose conversion were investigated. Up to 70.7% ethylene glycol yield was obtained over 3%Ni–15%WO 3 /SBA-15 catalysts. Several physicochemical methods such as XRD, Raman spectroscopy, NH 3 -TPD, H 2 -TPR and XPS were used to determine the character of catalysts. Based on these studies, it was found that there was a strong electronic interaction between NiO and WO 3 , which not only promoted the reduction of WO 3 , but restrained the reduction of NiO. Together with the experimental results, it can be concluded that the WO 3− X , which may be the active species for the selective cleavage of C C bond, was formed after catalysts pretreatment process. Additionally, a possible catalytic mechanism was proposed.
研究领域:
化学工程
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催化材料科学
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Xiaoxu Ran,Jie Ren,Shufen Zhang,Yue Wu,Suli Wu
Electrochromic photonic crystals (PCs) have been intensively studied in the field of display, sensors, and intelligent materials due to their tunable brilliant structural colors. The mostly studied electrochromic PCs are based on the tunable lattice parameter after electrifying; namely, the electrochromic process is caused by the structural change of PCs. Besides the lattice parameter, the refractive index is another key factor to determine the structural color of PCs. Here, a kind of hollow-SiO2-supported WO3 (H-SiO2/WO3) PCs is designed, where the refractive index of the WO3 portion is changeable under charging. Benefiting from the support effect and tunable thickness of H-SiO2, large-area PC samples with good surface morphology and bright multicolor output are prepared. The reflection peaks of these composite PCs can shift by 30–90 nm, and their corresponding colors changed obviously after the voltage was applied. After being pixelated by laser-marking, the H-SiO2/WO3 PCs can dynamically display different numeric and alphabetic patterns in an electric-driven writing and erasing process. Not only does this composite PC structure broaden the color change range of WO3-based materials but also avoids the structural change in the electrochromic process. This work provides more possibilities for electrochromic PCs in the field of color-changing pattern displays.
研究领域:
材料科学
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显示技术
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智能材料
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2016
·Vol. 80
·期 2
·480-486
·
IF 1.473
Liu Shuping,Wang Wei
Abstract
Construction of a composite WO 3 film has been considered to be an important way to improving the electrochemical performances and electrochromic properties. Herein, we fabricated a composite film containing WO 3 nanoparticles, chitosan (CS), and carbon nanotubes (CNTs) by a layer-by-layer technique (LbL). The composite film displays light black to dark blue over the potential range from 0 to −1.5 V. Compared with the WO 3 /CS film, the WO 3 /CS-CNTs film displays increased current densities, which supported a greater number of sites for Li + ions intercalation and extraction. Furthermore, the electrochromic performance of the composite film is enhanced by incorporation of CNTs into the WO 3 film, resulting in coloration efficiency of 79.2 cm 2 C −1 and optical contrast of 13.5 % at 800 nm under a square wave potential from −1.5 to +1.5 V. Therefore, the improved electrochromic properties could be achieved using WO 3 and CNTs composite film. Graphical Abstract
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2024
·
IF 5.8
Lei Wang,Ruipeng Hou,Tengfei Huang
The upconversion (UC) emission behavior occurs usually in rare-earth doped compounds but rarely in pure semiconductors. Herein, the UC emission behavior of WO 3 was investigated. The oxygen-vacancy-rich WO 3 nanosheets were rapidly synthesized by high-power laser irradiation. The red UC emission peaked at ∼1.75 eV is observed in the synthesized WO 3 nanosheets under continuous 980 nm or 1940 nm laser excitation. The UC emission stems from the abundant oxygen-deficient levels and belongs to a multiphoton absorption behavior. Meanwhile, the laser-power-dependent UC behavior could be attributed to the transformation of different oxygen defect states. On this basis, a variable output color phosphor based on Er-Yb co-doped WO 3 [WO 3 :(Er, Yb)] was developed. The WO 3 :(Er, Yb) phosphor can change the UC color from green to red with increasing the 980-nm laser power. Moreover, the upconversion behavior of WO 3 can be utilized to assist WS 2 photocatalysis. This work develops a pure semiconductor with an interesting UC emission and clarifies the UC mechanism.
研究领域:
材料科学
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光学
·
光催化
✓ 已验证
DOI
高影响因子
Electronics
·
2025
·Vol. 14
·期 6
·1183
·
IF 2.6
Liwei Zhang,Sixing Chen,Shaoming Fu,Songjia Han,Li Zhang,Yu Zhang,Mengye Wang,Chuan Liu,Xiaoci Liang
WO3-based electrochemical transistors (ECTs) are recognized as candidates for three-terminal memristors due to their high on–off ratio, long retention time, and rapid switching speed. However, their patterned fabrication often relies on complex vacuum systems or extreme processing conditions, hindering cost-effective scalability. Here, we developed a novel wet etching technique integrated with sol–gel-derived WO3channels, enabling ambient-air fabrication of Nafion-WO3ECTs. The wet-etched devices achieve an on–off ratio of ~105, surpassing unetched and dry-etched counterparts by orders of magnitude. Furthermore, they exhibit exceptional paired-pulse facilitation and long-term stability, maintaining 12 distinct conductance states for 103s, and an on–off ratio of ~102over 25 read–write cycles. XPS result shows higher W5+content and M-O-H bond proportion for wet-etched devices, revealing an optimized interface, with enhanced H+injection efficiency. The simulated artificial neural network using this wet-etched ECT shows ~97% recognition accuracy for handwritten numerals. This approach offers a novel patterning strategy for developing cost-effective, high-performance neuromorphic devices.
研究领域:
材料科学
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神经科学
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电子工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2020
·
IF 4.65
Chenhao Wang,Shendan Zhang,Lei Qiu,Sefiu Abolaji Rasaki,Fengdong Qu,Tiju Thomas,Yanping Liu,Minghui Yang
In this work, WO 3 nanosheets are synthesized successfully through the hydrothermal method . Ru is thereafter efficiently loaded on the surface of WO 3 using the ethylene glycol-assisted solvothermal method. The gas sensing test shows that 0.5 wt% Ru-WO 3 exhibits the best performance towards xylene detection. Compared with the pure WO 3 sensor, the gas response of the sensor based on 0.5 wt% Ru-WO 3 in 100 ppm xylene increases from 11 to 73, and the operating temperature decreases from 375 °C to 280 °C. And an ultra-low detection limit of 25 ppb is obtained. In addition, the gas sensing performance of the Ru-loaded WO 3 sensor is much better than that of Au, Pt and Pd-loaded WO 3 sensors. The enhanced gas sensing performance can be attributed to the catalytic overflow of Ru and the formation of heterojunction between RuO 2 and WO 3. It is expected that this finding gives rise to further efforts on efficient and low-cost xylene sensors that are based on Ru-loaded WO 3 .
研究领域:
材料科学
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传感器技术
✓ 已验证
DOI
高影响因子
Catalysts
·
2020
·Vol. 10
·期 5
·556
·
IF 3.52
Yuncheng Cao,Zheng Xing,Bobo Wang,Wei Tang,Rong Wu,Jiangyu Li,Ming Ma
Single-phase photoanodes often suffer inferior charge transport, which can be mitigated by constructing efficient heterojunctions. Thus, we have fabricated a fluorine-doped tin oxide (FTO)/WO3/BiVO4heterojunction using hydrothermal and spin-coating methods. Surface engineering was exploited to further accelerate the reaction kinetics, which was achieved via post-modification with NaOH solution. This treatment alters the surface chemical state of the BiVO4nanoparticles, leading to enhanced charge transport and surface water oxidation processes. As a result, the optimized sample can produce a photocurrent more than two times that of WO3. The simple post-treatment provides a viable and cost-effective strategy for promoting the photoelectric properties of photoanodes.Keywords:FTO/WO3/BiVO4heterojunction;photoelectrochemical;post-modification;surface engineering;solar water-splitting
研究领域:
材料科学
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能源科学
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Haolin Xie,Yongxiang Wang,Haitao Liu,Hengyu Wang,Yinghan Li,Xiaopeng Qi,Tongxiang Liang,Jinming Zeng
Electrochromic materials (ECMs) have received attention owing to its huge potential applications, such as smart dimming windows, static displays, and electrochromic capacitors. High optical contrast and long cyclic life of ECMs are extremely critical for practical applications. In this work, the WO 3 and rare earth Sm-doped WO 3 (WSm x , x = 2.0, 3.0, 4.0, 5.0) films were constructed by hydrothermal system, and then their morphology and electrochromic performance were explored. The morphology of the WO 3 film was transformed from an urchin-like to a nest-like porous structure by adding 4.0%Sm into the hydrothermal system. In comparison with the WO 3 film, the WSm4.0 film displayed higher optical contrast and cyclic life, which was resulting from its crystalline and amorphous mix phases, and nest-like porous structure with high Li + diffusion coefficient and strong structure stability. The optical contrasts of the WO 3 and WSm4.0 films were 57.9% and 61.4% at 633 nm wavelength, respectively. Furthermore, WSm4.0 film exhibited optical contrast of around 70% range from 700 to 1100 nm wavelength. Remarkably, WSm4.0 film still retained 91.7% and 73.6% of primitive optical contrast after 6000 and 10000 cycles, respectively. The nest-like porous WSm4.0 film are promising for assembling electrochromic smart windows with long cyclic life and high optical contrast.
研究领域:
材料科学
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电化学
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纳米技术
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光电子学
✓ 已验证
产品关联
DOI
高影响因子
Materials Science and Engineering B-Advanced Functional Solid-State Materials
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2020
·
IF 4.706
Yaru Shang,Xiaohu Cheng,Ruixia Shi,Qian Ma,Yingzi Wang,Ping Yang
The adsorption experimental results show that W 18 O 49 with oxygen vacancies not only has faster adsorption rates for MB but also has larger adsorption capacities than WO 3 . Besides, the maximum adsorption capacity of urchin-like W 18 O 49 (375.94 mg/g) is about 2.76 times of WO 3 (136.25 mg/g). However, photocatalytic results revealed that WO 3 has better photocatalytic degradation ability than W 18 O 49 . Generally, the adsorption efficiency of urchin-like W 18 O 49 (70.01%) is about 3.94 times of WO 3 (17.78%), while the photodegradation efficiency of WO 3 (62.45%) is 2.38 times of urchin-like W 18 O 49 (26.20%). Therefore, urchin-like W 18 O 49 has the best total removal efficiency, which can remove 96.21% of MB (50 ml, 90 mg/L) within 120 min. These studies emphasize the comprehensive effects of WO 3 and W 18 O 49 on dye removal from two aspects of adsorption and photocatalysis and provide strategies for the preparation of efficient dye removal materials.
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Inorganics
·
2016
·Vol. 4
·期 3
·24
·
IF 0
Fengdong Qu,Bo He,Rohiverth Guarecuco,Minghui Yang
Composite materials, which can optimally use the advantages of different materials, have been studied extensively. Herein, hybrid tungsten nitride and oxide (WN/WO3) composites were prepared through a simple aqueous solution route followed by nitriding in NH3, for application as novel sensing materials. We found that the introduction of WN can improve the electrical properties of the composites, thus improving the gas sensing properties of the composites when compared with bare WO3. The highest sensing response was up to 21.3 for 100 ppb NO2with a fast response time of ~50 s at room temperature, and the low detection limit was 1.28 ppb, which is far below the level that is immediately dangerous to life or health (IDLH) values (NO2: 20 ppm) defined by the U.S. National Institute for Occupational Safety and Health (NIOSH). In addition, the composites successfully lower the optimum temperature of WO3from 300 °C to room temperature, and the composites-based sensor presents good long-term stability for NO2of 100 ppb. Furthermore, a possible sensing mechanism is proposed.Keywords:WN/WO3composite;nanosheets;gas sensor;NO2;room temperature
研究领域:
材料科学
·
传感器技术
✓ 已验证
产品关联
DOI
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