查找使用阿拉丁产品的科研文献

Mesoporous In2O3 nanoflowers with oxygen vacancies for both alkaline and acidic CO2 electroreduction to formate/formic acid

Liang Fu,Zhenping Qu,Mengyuan Qin,Lingling Zhou

The CO2 reduction reaction (CO2RR) is desirable, yet catalysts that exhibit high activity across different pH levels are lacking. Herein, mesoporous In2O3 nanoflowers (In2O3 NFs) with abundant oxygen vacancies (OV) are prepared by calcining an In2S3 precursor, which can selectively reduce CO2 to formate/formic acid. The In2O3 NFs deliver 88.4% formate faradaic efficiency (FE) at 500 mA cm−2 in a flow cell under alkaline conditions (pH = 13.5). Impressively, a high formic acid FE of ∼90% from 100 to 600 mA cm−2 is achieved in an acidic solution (pH = 2), representing one of the most promising acidic CO2RR performances to date. The confinement effect of the porous structure could enrich K+ ions to enhance the local alkaline microenvironment at the electrode interface during acidic CO2RR, which is the key to inhibiting the hydrogen evolution reaction (HER) and protecting the catalyst against acid corrosion. This work provides an efficient electrocatalyst for CO2RR in both alkaline and acidic electrolytes.

Tuning the oxygen vacancy concentration in (GeMnTiSnMo)O2 high-entropy oxides for high dielectric through In2O3 doping

Zhang Zhenyan,Chai Huan,Yu Zhengqian,Li Jinsheng,Li Pengfei,Wu Lei,Li Zhanshuai,Qi Xiwei

TiO 2 -based materials are widely used in high-temperature capacitors and aerospace electronics but face challenges such as high dielectric loss and limited thermal stability in conventional single-component systems. To address these issues, we propose a novel strategy integrating high-entropy doping design and oxygen vacancy engineering. In 2 O 3 -doped (GeMnTiSnMo)O 2 high-entropy ceramics (GMTSMO- x In, x  = 0.1–1) were synthesized via solid-state reaction. Experimental results reveal that In 3+ doping generates high-density oxygen vacancies (V o ·· ) through charge compensation, forming [Ti 3+ - V o ·· -Ti 3+ ] and [Mn 3+ - V o ·· -Mn 3+ ] defect-dipole clusters. These clusters enhance electron localization and suppress carrier migration, reducing dielectric loss by threefold. Simultaneously, oxygen vacancy enrichment strengthens interfacial polarization, increasing the dielectric constant by fourfold. The optimal GMTSMO-0.5In exhibits a relative permittivity ( ε r ) of 4.0 × 10 6 and a low loss tangent of 15 at 650 ℃/100 Hz, outperforming traditional TiO 2 -based materials and existing high-entropy oxides. All compositions demonstrate excellent temperature stability (25–400 ℃) and frequency-independent behavior above 10 4  Hz. This work provides a high-entropy-driven approach for dynamic defect engineering, paving the way for advanced dielectric materials in extreme-condition energy storage systems.

High-Throughput Experimental Technology: Rapid Identification of the Precious Metal Modified In2O3 for NO2 Low-Temperature Sensing

Deqi Zhang,Qian Du,Li Yang,Jiyun Gao,Jianhong Yi,Ming Hou,Shenghui Guo,Hongbo Zeng

Stabilizing Pd/In2O3 on Zeolite Silicalite-1: A Route to Durable and Selective CO2 Hydrogenation to Methanol

Ziheng Li,Junxin Guo,Haoze Liu,Dule Huhe,Zhao Wang

Despite their high methanol selectivity in CO2 hydrogenation, In2O3-based catalysts still face limitations in CO2 conversion and long-term stability. This work addresses these challenges by designing a highly dispersed Pd/In2O3 catalyst supported on self-pillared silicalite-1 (SP-S-1) zeolite. The well-defined channels and abundant surface silanol groups of SP-S-1 effectively anchor and disperse In2O3 nanoparticles. This structure also spatially isolates Pd species, which prevents their sintering and inhibits the formation of inactive Pd–In alloys. Comprehensive characterization reveals that the strong metal-support interaction stabilizes oxygen vacancies and prevents over-reduction of In3+ species, which are crucial for CO2 activation and methanol selectivity. The optimized Pd/In2O3/SP-S-1 catalyst achieves a methanol space-time yield of 2.57 gMeOH·gIn+Pd-1·h-1 at 300 °C, approximately five times higher than that of the unsupported counterpart. More importantly, it demonstrates high stability, retaining 95% of its initial activity after 100 hours on stream, far outperforming the unsupported catalyst. This work highlights zeolite confinement as a versatile strategy for designing robust and efficient CO2-to-methanol catalysts.

Fabrication of flexible room-temperature NO2 sensors by direct laser writing of In2O3 and graphene oxide composites

Rui You,Dong-Dong Han,Fangmeng Liu,Yong-Lai Zhang,Geyu Lu

In this work, we reported the fabrication of flexible NO 2 sensors arrays operating at room temperature on a composite film of In 2 O 3 and graphene oxide (GO) by direct laser writing (DLW) technology. The laser treatment not only induced the photoreduction of GO , leading to a highly porous structure due to the removal of oxygen groups, but also permitted mask-free patterning through a programmable manner, enabling flexible integration of sensor arrays on any substrates. We demonstrated the fabrication of a 2 × 4 NO 2 sensors array on a flexible polyimide substrate within 10 min. Our NO 2 sensors based on In 2 O 3 and reduced GO (In 2 O 3 @RGO) show liner NO 2 sensing properties at room temperature, good responsivity and recovery properties, as well as excellent selectivity towards NO 2 . We deem that the DLW fabrication of flexible NO 2 sensorsarrays may contribute to the development of flexible electronics.

Construction of ultra-sensitive hydrogen sensor based on two phases In2O3 nanoparticles modified by regular dodecahedral ZnO

Zijian Wang,Dongzhi Zhang,Mingcong Tang,Yajing Chen,Yuehang Sun,Qingdong Chen,Jingdu Bian,Xingyan Shao

Hydrogen (H 2 ) is considered one of the promising energy sources to replace fossil fuels so efficient H 2 sensing technology is a necessary condition to ensure the safety of people’s livelihood and economic development. In this paper, ZnO obtained by calcination of precursor ZIF-8 has a regular dodecahedral structure. The product of In 2 O 3 obtained with the participation of the surfactant PEO-PPO-PEO has two different crystal forms, namely cubic phase c-In 2 O 3 and hexagonal h-In 2 O 3 . Crystal form c-In 2 O 3 is 7.07 wt% of the mass of h-In 2 O 3 . When ZnO is 5 wt% of In 2 O 3 , the H 2 sensor based on the ZnO (5 %)-Inc/Inh composite material has the best response performance and the operating temperature is 450 °C. The sensor’s response time for detecting 5000 ppm H 2 is less than 1 s, and the recovery time is 6 s with a response intensity of 79.91. The limit of detection (LOD) is 53 ppb, which is much lower than the explosive concentration (4–75 V/V%). Density functional theory (DFT) is utilized for investigating the performance advantages of Inc/Inh composites over pure c-In 2 O 3 and h-In 2 O 3 and further elaborating the mechanism of ZnO improving the gas-sensing performance of ZnO (5 %)-Inc/Inh. The sensor based on ZnO (5 %)-Inc/Inh composite may guide the research of high-performance H 2 sensors. The H 2 adsorption mechanism of the sensor was analyzed based on the oxygen adsorption mechanism.

A self-powered photoelectrochemical sensor based on an In2O3/Ag2S heterojunction for tetracycline detection and portable applications

Li Junyu,Li Haoyu,Hao Yujie,Pu Jiawei,Ye Linmei,Liu Wei

A self-powered photoelectrochemical (PEC) sensor based on an In 2 O 3 /Ag 2 S heterojunction was successfully developed for the highly sensitive monitoring of tetracycline (TC) traces in water matrices. Benefiting from superior intrinsic optoelectronic properties, hexagonal tubular In 2 O 3 was initially synthesized via a solvothermal reflux-heating route followed by thermal calcination. Subsequently, the In 2 O 3 /Ag 2 S heterojunction was fabricated through an in situ growth strategy, yielding a remarkably amplified photoelectric response and a robust, stable initial photocurrent driven entirely by internal potential. Under optimized operational parameters, the developed sensor delivered a wide linear detection range spanning from 1 nM to 1 mM, coupled with an ultra-low detection limit of 0.87 nM. Moreover, the sensing platform demonstrated outstanding long-term stability, rapid transient response, robust anti-interference selectivity, and satisfactory reproducibility. Crucially, by integrating a dedicated microcontroller-based hardware module, device portability was successfully realized, offering a viable blueprint for the decentralization of PEC instrumentation. Although the current hardware prototype remains at a preliminary stage, this work establishes a rigorous and practical fundamental framework for low-cost, on-site antibiotic field screening. Graphical abstract The alternative text for this image may have been generated using AI.

Thermally Driven Hydrogenation of CO2 to Light Olefins Over Hollow Cubic In2O3-La-ZIF-8 Tandem Catalyst

Haifeng Tian,Haowei Huang,Zhiyu Chen,Fei Zha,Hongshan Chen,Ruiying Ding,Yu Zhang,Hao Wei,Yuzhong Mao,Irshad Hussain,Zhicheng Zhang

en Thermally driven hydrogenation of CO 2 to light olefins (C 2 = –C 4 = ) using metal oxide-zeolite tandem catalysts is an effective strategy for achieving carbon neutrality. However, progress in this area is constrained by zeolite pore transport limitations, acid-site inactivation, and surface carbon poisoning. To address these issues, we replaced conventional zeolites with La-modified ZIF-8 and combined it with hollow cubic In 2 O 3 to develop a novel In 2 O 3 -La-ZIF-8 tandem catalyst. Our study investigates the effects of the hydrothermal reaction temperature used for synthesizing In 2 O 3 and the La content in ZIF-8 on catalytic performance. We also found that the oxygen vacancy (O V ) concentration in In 2 O 3 can be substantially regulated by adjusting the hydrothermal temperature. The In 2 O 3 sample with the highest O V concentration not only promotes the formation of reaction intermediates but also markedly reduces the energy barrier of the rate-determining step in methanol synthesis. Comprehensive characterization and simulation analyses indicate that La incorporation enhances the thermal stability of ZIF-8, improves its ability to adsorb and activate reaction intermediates, and effectively adjusts its acid-base properties. Under a reaction pressure of 3.0 MPa and a temperature of 360°C, the hollow cubic In 2 O 3 -La-ZIF-8 tandem catalyst achieves 23.5% CO 2 conversion with 65.3% C 2 = –C 4 = selectivity. 摘要 zh 利用金属氧化物-分子筛串联催化剂 , 通过热驱动将CO 2 转化为低碳烯烃(C 2 = –C 4 = ) , 是实现碳中和的有效策略。然而 , 该领域的发展受到分子筛孔道传质限制、酸性位点失活及表面积碳等问题的制约。为解决这些难题 , 本研究以La修饰的ZIF-8替代传统分子筛 , 并将其与空心立方体In 2 O 3 相结合 , 开发了一种新型的In 2 O 3 -La-ZIF-8串联催化剂。系统探究了In 2 O 3 水热合成温度以及ZIF-8中La含量对催化剂性能的影响。通过调节水热温度可显著调控In 2 O 3 中的氧空位浓度 , 具有最高氧空位浓度的In 2 O 3 样品不仅能促进反应中间体的生成 , 还可显著降低甲醇合成过程中决速步骤的能垒。综合表征与模拟分析表明 , La的引入增强了ZIF-8的热稳定性 , 提升了其对反应中间体的吸附与活化能力 , 并有效调节了其酸碱性质。在3.0 MPa、360°C的反应条件下 , 空心立方In 2 O 3 -La-ZIF-8串联催化剂上实现了23.5%的CO 2 转化率与65.3%的低碳烯烃选择性。

Enhanced Thermoelectric Performance in Ga-Doped In2O3 through Synergistic Optimization of Carrier Concentration and Lattice Thermal Conductivity

Dong Wang,Huijuan Wu,Xiangbin Chen,Ning Qi,Man Jiang,Zhiquan Chen

In this paper, gallium-doped indium oxide (In2O3) compounds with different doping amounts were fabricated through the hydrothermal method and the Spark Plasma Sintering process. X-ray diffraction showed that Ga was efficiently doped into the In2O3 lattice. The electrical conductivity is significantly improved by Ga doping, which is due to the reduced potential barrier of the carriers for the transition to the conduction band. The carrier concentration of Ga-doped In2O3 reaches 1.11 × 1020 cm–3, which is 12 times that of pristine In2O3, and the electrical conductivity (6.79 × 104 S m–1) is 5 times that of pristine In2O3. Furthermore, the lattice distortion in the doped sample acts as strong phonon scattering centers, which effectively reduce the mean free path of the phonons, resulting in a significant decrease in the lattice thermal conductivity. Finally, at 873 K, the zT value of In1.88Ga0.12O3 reaches 0.22, which shows a 100% increase compared with that of the pure In2O3 sample. Our results show that the control of metal doping and microstructure can achieve synergistic optimization of the electrical properties and thermal conductivity of In2O3, providing a reference for other thermoelectric materials.

Amorphous metal-organic frameworks-derived In2O3 microstructures with abundant oxygen vacancies for superior chlorine gas sensing performance

Ziwei Zhang,Jiangwei Ma,Weixiao Hou,Haichao Zhai,Hui Yong,Jifan Hu,Kewei Zhang,Yu Zhang,Haiwen Wang,Jiachen Liu

Metal-organic frameworks (MOFs) are characterized by their porous structures, which provide an exceptionally large specific surface area and a precisely controlled composition. Amorphous MOFs ( a MOFs) integrate the diverse properties of MOFs with those of amorphous materials, such as hierarchical morphology and abundant deficiencies. Therefore, a MOFs serve as promising precursors for metal oxides with porous structures and rich vacancies. NH 2 -MIL-68 (In) is a novel indium-MOF material with promising features. In this research, the amorphous NH 2 -MIL-68 (In) ( a NH 2 -MIL-68 (In)) was chosen as the template. Indium oxide rough straight rods ( a -In 2 O 3 RSRs) with extensive oxygen vacancies were prepared, where a - indicates that the precursor is amorphous. As a result, the a -In 2 O 3 RSRs sensor demonstrated an outstanding gas sensing response towards 2 ppm chlorine (Cl 2 ) at a low temperature of 160℃. This study is the first to report that the a MOFs can be employed as gas sensing materials with superior Cl 2 detection capabilities, offering a promising method for real-time gas monitoring.

Significantly reduced lattice thermal conductivity and enhanced thermoelectric performance of In2O3(ZnO)3 ceramics by Ga2O3 doping

Lulu Huang,Jun Guo,Zhen-Hua Ge,Yehua Jiang,Jing Feng

The In 2 O 3 (ZnO) 3 + x mol%Ga 2 O 3 ( x  = 0, 0.1, 0.3, 0.5, 1) ceramics were synthesized by a solid-state reaction process. The effect of Ga doping on the thermoelectric properties of the In 2 O 3 (ZnO) 3 ceramics was studied. The phase structure and microstructure of all the bulk samples were checked by X-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM), respectively. Additionally, the minimum thermal conductivity of 1.45 Wm −1 K −1  at 973 K is obtained for 0.5% Ga-doped sample, which is 35% lower than that of the pristine sample. The significantly decreased thermal conductivity for Ga 2 O 3 -doped sample is due to the enhanced scattering of phonons , which is derives from the point defects caused by Ga-doping and the introduction of the second phase. As a result, the In 2 O 3 (ZnO) 3 +0.5 mol% Ga 2 O 3 sample achieved the highest ZT value of 0.23 at 973 K.

Platinum Nanoclusters-Modified Porous In2O3 Nanocubes for Highly Sensitive and Selective Formaldehyde Gas Sensing at Room Temperature

Liangyu Zhai,Gangqiang Zhu,Fei Rao,Zehan Liu,Weibin Zhang,Lujun Zhu,Xianjin Shi,Yu Huang,Yanmin Jia,Mirabbos Hojamberdiev

The detection of formaldehyde gas generally requires a relatively high temperature. It is still challenging to simultaneously possess high sensitivity and strong selectivity for the detection of low-concentration formaldehyde at room temperature . The activation energy of the reaction can be reduced by introducing oxygen vacancies or loading the metal clusters on the surface of metal oxide-based semiconductors, leading to an improvement in the performance and detection limit of the sensor. However, this approach may lead to an increased cross-sensitivity to other gases and a reduction in the selectivity of the sensors. In this study, In 2 O 3 can capture a significant amount of adsorbed oxygen by increasing the oxygen vacancies and introducing platinum nanoclusters on the surface of In 2 O 3 synthesized with a specific morphology, leading to high sensitivity and selectivity for the detection of formaldehyde gas at room temperature. The Pt-In 2 O 3 sensor exhibits a response value of approximately 38 to a concentration of 1 ppm formaldehyde gas at 20 °C. Moreover, the developed sensor demonstrates excellent performance in a complex atmosphere and exhibits good long-term stability. The achieved high sensitivity and selectivity for the detection of formaldehyde gas at low temperatures hold significant implications for research and practical applications in the field of sensors.