SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Chengyu Yang,Ying Yang,Chengxin Zhang,Hui Yu,Tingting Wang,Keying Shi,Zhuanfang Zhang,Dongjie Wang,Xiangting Dong
In this paper, a simple method to synthesize Ag-doped Fe 2 O 3 hollow nanofibers by electrospinning was reported. The synthesized samples were fabricated into gas sensors, and their sensing properties were studied systematically. The results showed that the Ag-doped Fe 2 O 3 materials were hollow tubular structures and had high response (R a /R g = 19.43), selectivity and sensitivity to H 2 S at room temperature. The response mechanism of the sensor to H 2 S was studied by DFT, O 2 -TPD and H 2 -TPR. It was considered that the excellent gas sensing performance of the sensor was that the Ag-dopant increased the concentration of carriers, adsorbed oxygen and lattice oxygen. The rough hollow structure was conducive to gas adsorption and capture, which provided many active centers for the sensing reaction. Therefore, the Ag-doped Fe 2 O 3 nanofibers with hollow structure will have promising uses as sensing material in future applications.
研究领域:
材料科学
·
传感器技术
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2022
·
IF 6.14
Guo Li,Changxue Dong,Genshuai Sun,Mingzhe Li,Xin Cao,Li Zhou,Tao Chen,Fan Yang
Doping is a simple method to modulate the electronic configuration of semiconductor photocatalysts. This study regulated the energy band structure of CdSe nanosheets by Ag doping, which reduced the energy bandwidth of CdSe nanosheets by increasing the carrier density, thereby improving the efficiency of the photocatalytic reduction of uranium by CdSe nanosheets. A 96% removal of U(VI) was achieved by 3% Ag-CdSe nanosheets, which was 1.9 and 1.2 times higher than that of pristine CdSe nanosheets (50%), and 1% Ag-CdSe nanosheets (81%), respectively. Additionally, at pH = 4.0 and a solid–liquid ratio of 0.25, the reduction of uranium by 3% Ag-CdSe nanosheets (765 mg/g) was 2.2 times higher than that of pristine CdSe nanosheets (345.6 mg/g). This study provides a new idea for other efficient photocatalysts designed for uranium reduction.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2022
·
IF 6.76
Jianzhi Wang,Yu Luo,Tong Xu,Ziyi Guo,Guopeng Chen,Yuchen Ren,Yanan Xue,Ning Cai,Hui Li,Faquan Yu
The development of low-cost and highly efficient electrocatalysts for oxygen evolution reaction (OER) with good conductivity, high specific surface area and abundant oxygen vacancies is of great significance for the future renewable energy conversion and storage system. Herein, Ag doped NiMoO 4 materials on the Ni foam (NiMoO 4 /Ag/NF) with rich oxygen vacancies were successfully prepared by hydrothermal strategy and layer by layer assembly method. The Ag ions are doped in-situ to promote electron transfer and compensate for the poor conductivity of metal oxides. The suitable air annealing treatment is used to create rich oxygen vacancies. The high specific surface area and one-dimensional characteristics of the cross mesoporous nanorod skeleton are responsible for the increased exposure of active centers and the rapid charge transfer behavior. The NiMoO 4 /Ag/NF exhibits high activity for OER in alkaline solution (an overpotential of 275 mV at the current density of 20 mA cm −2 ) and low Tafel slope (53.67 mV dec −1 ), and a satisfying durability in 1.0 M KOH. This study provides an effective method for the preparation of Ag doped one-dimensional nanomaterials with excellent OER catalytic performance and electrochemical stability.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2023
·
IF 5.7
Zi-Chen Wang,Xiao-Di Jiang,Yu-Xian Duan,Xu Wang,Zhen-Hua Ge,Jin-Ming Cai,Xiao-Ming Cai,Hong-Lin Tan
Tin selenide exhibits outstanding thermoelectric properties. Among its various forms, multicrystalline SnSe stands out as a more practical choice compared to single-crystal SnSe, owing to its straightforward chemical synthesis process, enhanced processability, and scalability. Herein, we synthesized p-type polycrystalline Sn 1−x Ag X Se bulk materials (x = 0, 0.01, 0.015, 0.02, 0.025, 0.03) using a simple hydrothermal and hot pressing method. Characterization methods such as XRD , Raman and XPS were used to demonstrate the successful doping of Ag + into the SnSe matrix. When the doping concentration reached Sn 0.98 Ag 0.02 Se (x = 0.02), Ag + reached the optimal concentration in the SnSe matrix, causing significant lattice distortion which increased phonon scattering and lowered the thermal conductivity , resulting in Sn 0.98 Ag 0.02 Se achieving ZT max = 1.14. However, when the doping concentration exceeded Sn 0.98 Ag 0.02 Se (x > 0.02), excess silver ions precipitated, partially acting as charge carriers, leading to a significant increase in electrical conductivity , resulting in Sn 0.97 Ag 0.03 Se having an electrical conductivity of 6860 s/m at 773 K. Compared to the pure phase, the electrical conductivity of Sn 0.97 Ag 0.03 Se increased by 259 %, and the ZT value of Sn 0.98 Ag 0.02 Se increased by 178%. This work demonstrates that Ag + is an effective p-type dopant in the SnSe system and indicates that high ZT values in SnSe can be achieved through a simple, low-cost, and environmentally friendly method.
研究领域:
材料科学
·
能源材料
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
RENEWABLE ENERGY
·
2025
·
IF 9.1
Wenhao Liao,Qinghua Yang,Haiben Jiang,Pengwei Liu
Silver (Ag) and phosphorus (P) doping have been demonstrated to optimize electron density, enhance conductivity, and accelerate electron transfer. Moreover, construction of hollow structures can expose more active sites, significantly improving the performance of catalysts. Therefore, developing P/Ag-doped hollow structures for water splitting is highly promising and meaningful. However, similar studies remain rarely reported. In this work, we designed and synthesized a P-doped Ag 3 [Co(CN) 6 ] hollow cuboid, named as P/Ag@AgCo PBA, aiming to develop an efficient and high-performance water splitting catalyst. Benefiting from its hollow structure and P/Ag co-doping, the optimized P/Ag@AgCo PBA-1 exhibited outstanding catalytic activity. • In the hydrogen evolution reaction (HER), it achieved a current density of 10 mA cm −2 at a low overpotential (η 10 ) of 117 mV with a Tafel slope of 43.6 mV dec −1 . • In the oxygen evolution reaction (OER), the η 10 was 253 mV, and the Tafel slope was 65.3 mV dec −1 . • In the hydrogen evolution reaction (HER), it achieved a current density of 10 mA cm −2 at a low overpotential (η 10 ) of 117 mV with a Tafel slope of 43.6 mV dec −1 . • In the oxygen evolution reaction (OER), the η 10 was 253 mV, and the Tafel slope was 65.3 mV dec −1 . Owing to its excellent HER and OER performance, when employed as both the cathode and anode in overall water splitting, the catalyst required only 1.66 V to reach a current density of 10 mA cm −2 . Furthermore, it demonstrated remarkable catalytic stability over 24 h of continuous operation. We believe this facile and effective etching and heteroatom co-doping strategy offers new opportunities for the development of similar high-performance water splitting catalysts.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2024
·
IF 6.3
Yutian Wang,Jingyuan Guo,Letu Siqin,Chenjun Yang,Lei Wang,Shuyu Li,Ruijian Liu,Hongmei Luan,Chengjun Zhu
Defect modulation is one of the key factors in determining the performance of solar cells, and the presence of defects tends to adversely affect carrier recombination and transport, thus having a direct impact on both cell stability and efficiency. Ag doping can modulate the defects, but in-depth studies on the mechanism of the effect are needed. Therefore, an in-depth study of the effect of Ag incorporation on the defect modulation mechanism of Kesterite Cu 2 ZnSn(S,Se) 4 (CZTSSe) solar cells is of great practical significance for understanding the mechanism of action of Ag doping and further optimising the cell performance. In this study, (Ag x Cu 1-x ) 2 ZnSn(S,Se) 4 (0 ≤ x ≤ 1) (ACZTSSe) solar cells were successfully prepared by N, N-dimethylformamide (DMF) solution, which have the characteristics of reducing defects and enhancing photovoltaic performance. After the introduction of Ag, the absorber formed a crystal structure with few holes and penetrating top and bottom. And the electrical performance of the solar cell is significantly improved, J 0 is reduced from 4.6 × 10 −5 A/cm 2 to 2.7 × 10 −6 A/cm 2 , and its contribution to the photovoltaic conversion efficiency (PCE) improvement reaches 142%. This indicates that the introduction of Ag helps to optimize the quality of the absorber, thereby reducing the concentration of interfacial and bulk defects. It also reduces carrier recombination and improves carrier lifetime from 0.86 ms to 1.75 ms. Ultimately increasing our cell efficiency from 7.55% to 10.64% when the Ag content reached 5%. These results clearly show that we have successfully achieved the modulation of defects in CZTSSe solar cells by Ag doping.
研究领域:
材料科学
·
可再生能源
·
光伏技术
✓ 已验证
产品关联
DOI
高影响因子
ANALYST
·
2019
·Vol. 144
·期 8
·2643-2648
·
IF 4.019
Yao Tang,Juntao Xu,Chengyi Xiong,Yan Xiao,Xiuhua Zhang,Shengfu Wang
Gold nanoclusters (Au NCs) are a type of emerging ECL emitter with molecule-like properties and low toxicity that hold great potential for sensing application. However, the application of Au NCs in ECL sensing is still limited due to their low ECL efficiency. In this work, we provided an effective way to enhance the ECL efficiency of Au NCs. By doping Ag on GSH-protected Au NCs to form bimetallic clusters (GSH-Ag/Au NCs), the ECL efficiency of Au NCs was greatly improved. Based on the enhanced ECL signal of Au NCs, an ultrasensitive ECL sensor was constructed for the detection of dopamine (DA). DA exhibited a prominent ECL quenching effect towards the formed bimetallic GSH-Ag/Au NCs which can be used for DA detection. The proposed ECL sensor exhibited excellent sensitivity, selectivity and stability and had a wide linear range from 10 nM to 1 mM with a low detection limit of 2.3 nM (S/N = 3). More importantly, this work provided a potential method to improve the ECL properties of Au NCs and widen their analytical application.
研究领域:
分析化学
·
生物传感
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 63
·58113-58117
·
IF 3.289
Guangguang Huang,Chunlei Wang,Xiaojing Xu,Yiping Cui
We reported an optical ratiometric temperature sensor via dopant-dependent dual emissions in Ag&Mn:ZnInS QDs. For QDs, the Ag-related emission is around 485 nm arising from the radiative recombination of the captured electrons' anion vacancies with holes trapped at the Ag dopant level. The energy level of anion vacancies is just below the conduction band, which can attain thermal equilibrium easily without further energy level adjusting. Moreover, Mn-related emission is around 585 nm via the Mn2+ ligand-field transition from 4T1 to 6A1. Mn-related thermal equilibrium is effectively suppressed due to the large energy gap between the conduction band and 4T1 energy level. These features not only obtain the opportunity to use the photoluminescence temperature specificity of Ag and Mn for ratiometric temperature sensing, but also make the flash synthetic approach via a pot non-injection possible. This temperature sensor, designed with Ag&Mn:ZnInS QDs, exhibits good temperature sensitivity (∼0.227% °C−1) and high QY (20%).
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Songrong Cheng,Yingjuan Li,Kaizhao Wang,Qianxu Ye,Kun Dong,Yunzhu Wang,Sufang He,Chunjian Wang,Lingde Kong,Feng Liu,YongQiang Yang,Ji Ma,Qingming Chen,Sheng'an Yang
Polycrystalline manganese oxides exhibit remarkable tunable magnetoresistance (MR) and anisotropic magnetoresistance (AMR), rendering them highly promising for magnetic sensor applications. However, their practical utilization is hindered by two critical challenges: (i) the requirement of high magnetic fields to achieve optimal electromagnetic properties, and (ii) the deviation of the metal-insulator transition temperature (T MI ) from room temperature. In this study, La 0.68 Sm 0.02 Ca 0.3 MnO 3 :Ag x ( x = 0.1–0.4) composites were synthesized via sol–gel and solid-phase methods. Notably, at x = 0.2, exceptional MR and AMR values of 88 % and 123 %, respectively, were achieved near room temperature under a low magnetic field of 1 T. This represents the highest AMR performance reported to date for polycrystalline materials under similar conditions, comparable to thin films. The incorporation of Ag was found to mitigate grain boundary scattering while enhancing interfacial spin polarization, thereby significantly improving MR. The extraordinary AMR is attributed to the anisotropic spin–orbit coupling (SOC) effect. Resistivity data were well–fitted using electron-scattering and small-polaron hopping models, further validating the pivotal role of SOC in enhancing AMR under varying magnetic fields. These findings provide a robust foundation for advancing perovskite manganese oxides in manganite–based device applications.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Xu Zhang,Li Tong,Xiahui Shi,Zhaosheng Li,Zhaohui Xiao,Yipu Liu,Tao Zhang,Shiwei Lin
The demand for clean energy sources has driven focus towards advanced electrochemical systems. However, the sluggish kinetics of the oxygen evolution reaction (OER) constrain the energy conversion efficiency of relevant devices. Herein, a one-step method is reported to grow oxygen vacancies (V o ) rich NiFeAg layered double hydroxides nanoclusters on carbon cloth (V o -NiFeAg-LDH/CC) for serving as the self-supporting electrode to catalyze OER. The OER performance of V o -NiFeAg-LDH/CC has been remarkably enhanced through Ag and V o co-modification compared with pristine NiFe-LDH, achieving a low Tafel slope of 49.7 mV dec −1 in 1 m KOH solution. Additionally, the current density of V o -NiFeAg-LDH/CC is 3.23 times higher than that of the state-of-art IrO 2 at 2 V under an alkaline flow electrolyzer setup. Theoretical calculations and experimental results collectively demonstrate that Ag dopant and V o strengthen the O* adsorption with active sites, further promoting the deprotonation step from OH* to O* and accelerating the catalytic reaction. In a word, this work clarifies the structural correlation and synergistic mechanism of Ag dopant and V o , providing valuable insights for the rational design of catalyst for renewable energy applications.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials
·
2024
·Vol. 17
·期 6
·1312
·
IF 3.1
Yanqiu Feng,Henghui Qu,Yanxiang Wang,Lanzhong Wang,Yongbo Wang,Deli Yang,Bohan Ding,Yue Sun,Jinghe Guo,Shichao Dai
Based on MnO2/carbon cloth (CC) composite materials, an Ag-doped MnO2nanowire, self-assembled, urchin-like structure was synthesized in situ on the surface of CC using a simple method, and a novel and efficient flexible electrode material for supercapacitors was developed. The morphology, structure, elemental distribution, and pore distribution of the material were analyzed using SEM, TEM, XRD, XPS, and BET. The electrochemical performance was tested using cyclic voltammetry (CV) and galvanostatic charge/discharge (GCD). In the three-electrode system, GCD testing showed that the specific capacitance of the material reached 520.8 F/g at 0.5 A/g. After 2000 cycles at a current density of 1 A/g, the capacitance retention rate was 90.6%, demonstrating its enormous potential in the application of supercapacitor electrode materials.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DALTON TRANSACTIONS
·
2020
·Vol. 49
·期 31
·11005-11009
·
IF 4.174
Simin Hou,Qiaohong Li,Qing-Rong Ding,Yao Kang,Jian Zhang,Lei Zhang
Two heterometal-oxo Ag2Ti10 (PTC-221) and Ag4Ti8 (PTC-222) clusters were successfully synthesized and characterized, with the doped Ag atoms surrounded by the Ti–O core and exposed to the cluster surface, respectively. Density functional theory (DFT) calculations were carried out to study the electronic structures of PTC-221 and PTC-222, including the frontier orbitals and partial density of states (PDOS). The solid-state UV-vis absorption spectra of PTC-221 and PTC-222 were also recorded. Interestingly, PTC-221 shows intense visible light absorption with an absorption edge around 590 nm and exhibits good photocurrent response in the visible region.
研究领域:
无机化学
·
材料科学
·
计算化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）