ACS Applied Nano Materials
·
2024
·
IF 5.3
Xiang-Yu Feng,Mao-Jin Ran,Man-Man Yuan,Mei-Tong Wei,Liang Wu,Zhi-Yi Hu,Li-Hua Chen,Yu Li,Bao-Lian Su
Li-rich Mn-based layered oxides with high specific capacity and operating voltages have become one of the most promising materials for lithium-ion batteries (LIBs). However, it still faces several issues of low initial Coulombic efficiency, poor electronic conductivity, and voltage fading due to oxygen release and transition metal rearrangement during cycling. In this study, Li1.2Mn0.54Ni0.13Co0.13O2 (LMR) cathode material with Na ion doping (LMNaR) and CeO2 nanoparticle surface modification (LMNaR@CeO2) is prepared to realize a synergistic modification effect. The doping of Na ions enlarges Li layer spacing to effectively promote the insertion and extraction of lithium ions, which makes the layered structure more stable to reduce the effect of the phase transition. And the CeO2 nanoparticle surface modification restrains the side reactions between electrode and electrolyte, stabilizes lattice oxygen, and eases oxygen release. As a result, LMNaR@CeO2 displays a specific capacity of 196 mAh g–1 after 100 cycles at 0.5 C with a capacity retention of 94% and a merely voltage decay of 0.16 V, which are much better than those of LMR with a specific capacity of 159.6 mAh g–1 and only a 79% capacity retention. Our strategy here provides a feasible approach for the development of Li-rich Mn-based cathode materials for long-lived LIBs.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
Advanced Energy Materials
·
2023
·Vol. 13
·期 19
·2300253
·
IF 27.8
Yage Zhou,Chunxu Xiang,Qi Dai,Sitong Xiang,Ran Li,Yuancai Gong,Qiang Zhu,Weibo Yan,Wei Huang,Hao Xin
Thin film solar cells on semitransparent substrates are attracting much attention due to new application scenarios including building-integrated photovoltaics (BIPV). Environmentally-benign element constituted and highly stable kesterite Cu 2 ZnSn(S,Se) 4 (CZTSSe) thin film solar cells are ideal candidates for such applications. However, the efficiency of kesterite solar cells on semitransparent substrates is far behind that on opaque Mo-based substrates. Here, fabrication of CZTSSe solar cells on fluorine-doped tin oxide (FTO) substrates from molecular solution and how step-by-step absorber engineering improves device performance is reported. A power conversion efficiency of 7.02% is obtained when the absorber is fabricated on bare FTO, which is improved to 9.56% after adding a MoO 3 interfacial layer. Investigations show the enhancement originates from the transformation of MoO 3 to MoSe 2 during film selenization which initiates crystallization at the back contact and at the same time prevents oversize grains at the absorber surface. Na-doping and Ag alloying further facilitate grain growth and mitigate band tailing, resulting in a certified effective area efficiency of 11.43% with all device parameters comparable to that on an Mo-substrate. This is the first time highly efficient kesterite solar cells are demonstrated on transparent electrodes, which opens up new opportunities for these earth-abundant elements composed of thin film photovoltaics.
研究领域:
材料科学
·
光伏技术
·
半导体物理
·
能源材料
·
薄膜器件
·
无机功能材料
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Decai Zhu,Jie Yu,Yingbo Zhang,Jiamei Liu,Yuzhao Ouyang,Jiangyu Yu,Zhongqing Liu,Wenliang Fan,Xixi Bai,Nan Wang,Erjun Bu,Chengjun Zhu
The LiNi 0.8 0 Co 0.15 Al 0.05 O 2-δ (LNCA) electrode exhibits better catalytic activity in low-temperature solid oxide fuel cells (LT-SOFCs). However, LNCA still faces some challenges in commercialization due to poor stability, scarcity of lithium resources, and high costs. Here, Na-doped LNCA electrode not only enriches oxygen vacancies and prolongs long-term stability, but also maintains a layered structure and reduces costs. At 550 °C, under the optimal ratio of L 0.85 Na 0.15 NCA electrode, the maximum power density (MPD) of a single cell reaches 1147 mW cm −2 with an open circuit voltage (OCV) of 1.13 V and a polarization impedance (R p ) of 0.21 Ω cm 2 , which is 30.6% higher than the single cell power (878 mW cm −2 ) of the Na-undoped LNCA electrode. The cell maintained long-term stability for 108 h at a constant current density of 156.25 mA cm −2 and a voltage of about 0.9 V. The results indicate that Na-doped LNCA is an effective strategy to improve the electrochemical performance of LNCA and long-term stability of cell.
研究领域:
材料科学
·
电化学
·
能源存储与转换
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2021
·Vol. 9
·期 48
·17531-17541
·
IF 7.393
Qichen Zhao,Honglie Shen,Kai Gao,Yajun Xu,Xuewen Wang,Yufang Li
Treating kesterite layers with sodium has been proved to be an effective way to improve the photovoltaic performance of Cu2ZnSnS4 (CZTS) solar cells. However, elemental diffusion effects inside the film and heterojunction energy band matching on the performance of flexible solar cells are rarely reported. In this work, flexible CZTS solar cells were doped with various sodium sources using a simple solution spin-coating post-treatment method. The research results demonstrated that films prepared by Na2S2O3 solution doping exhibit improved crystalline quality and photoelectric properties, while also inhibiting the growth of impurity defects within the films. Further optimization of the doping concentration of post-treatment solution showed that when the doping ratio was 0.05 mmol mL−1, the grain growth of the prepared film was larger, and adhesion between the film layers was enhanced. The energy band bending of the CZTS/CdS heterojunction exhibited a “cliff” arrangement when the conduction band offset (CBO) value was −0.34 eV, facilitating carrier transport in the space charge region and enhancing the collection of photogenerated carriers. The flexible CZTS solar cell constructed on this basis exhibited excellent bending resistance and a maximum photoelectric conversion efficiency (PCE) of 5.83% with an open-circuit voltage (Voc) of 609 mV.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
Scientific Reports
·
2024
·Vol. 14
·期 1
·1-14
·
IF 3.8
Wang Haiyan,Chen Jin,Sun Yu,Wang Fengchao,Yang Jing,Zhang Canyun,Kong Jinfang,Li Lan
Lead-free halide double perovskite Cs 2 AgInCl 6 has been extensively studied in recent years due to the lead toxicity and poor stability of common lead halide perovskites. In this study, sodium (Na + ) and bismuth (Bi 3+ ) doped into Cs 2 AgInCl 6 double perovskite, then Cs 2 Ag 1− x Na x In 1 − y Bi y Cl 6 films with broadband warm-yellow emissions were achieved by the blade coating method. Herein, Na and Bi content were changed as variables at a series of parameter optimization experiments, respectively. In the Cs 2 Ag 1− x Na x In 1 − y Bi y Cl 6 systems, Na + broke the parity-forbidden transition of Cs 2 AgInCl 6 , and Bi 3+ suppressed non-radiative recombination. The partial replacement of Ag + with Na + ions and doping with Bi 3+ cations were crucial for increasing the intensity of the PL emission. The experimental results showed that the photoluminescence quantum yield of the Cs 2 Ag 0.4 Na 0.6 In 0.8 Bi 0.2 Cl 6 film was 66.38%, which was the highest data among all samples. It demonstrated remarkable stability under heat and ultraviolet conditions. After five thermal cycles, the PL intensity of the Cs 2 Ag 0.4 Na 0.6 In 0.8 Bi 0.2 Cl 6 film is only reduced to approximately 5.7% of the initial value. After 720 h continuous ultraviolet irradiation, there occurred 31.9% emission decay of the film.
研究领域:
材料科学
·
光学
·
能源技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Energy Materials
·
2018
·
IF 0
Jing Ma,Xing Guo,Long Zhou,Zhenhua Lin,Chunfu Zhang,Zhou Yang,Gang Lu,Jingjing Chang,Yue Hao
Perovskite solar cells (PSCs) have been developed rapidly in recent years due to the excellent photoelectric properties and development potential. In this study, high performance and hysteresis-less planar structured perovskite (MA1–yFAyPbI3–xClx) solar cell was successfully achieved via contact passivation of the compact titanium dioxide (TiO2)/perovskite interface with NaCl doping method. It was found that the sodium chloride (NaCl) doping treatment on TiO2 could significantly improve the electrical property of TiO2 electron transport layer (ETL), and passivate the trap states at TiO2/perovskite interface. Moreover, the improved interface contact between TiO2 ETL and perovskite could efficiently enhance the charge transfer and suppress the charge recombination in the device. Hence, the power conversion efficiency (PCE) of PSC device based on NaCl-doped TiO2 was enhanced to 18.3% compared with the pristine compact TiO2-based PSCs (15.1%).
研究领域:
材料科学
·
光伏技术
·
能源材料
✓ 已验证
产品关联
DOI
Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 38
·22064-22071
·
IF 12.732
Wenda Zhang,Jie Feng,Fengqi Lu,Alberto J. Fernández-Carrión,Hui Fu,Xiaojun Kuang
Na-doped melilite-type silicate Sr2MgSi2O7 was reported to display high oxide ion conductivity. In this work, through multiple complementary techniques including X-ray diffraction, scanning electron microscopy, transmission electron microscopy, solid-state 29Si and 23Na nuclear magnetic resonance spectroscopy, and DFT calculations of defect formation energies, we found that it is hard to replace Sr with Na in Sr2MgSi2O7, and the Sr2−xNaxMgSi2O7−0.5x compositions formed mixed crystalline Sr2MgSi2O7 and Na-containing glassy phases. AC impedance spectroscopy measurements indicated that the ionic conduction in Sr2−xNaxMgSi2O7−0.5x could be from Na+ ions in the glassy phase, instead of the oxide ions.
研究领域:
材料科学
·
固体离子导体
·
无机非金属材料
·
能源材料
·
电化学
✓ 已验证
DOI
高影响因子
ACS Applied Energy Materials
·
2022
·
IF 6.959
Enyi Hu,Jun Wang,Muhammad Yousaf,Faze Wang,Bin Zhu,Peter D. Lund
Ceramic fuel cells (CFCs) employing lithium compounds, that is, Ni0.8Co0.15Al0.05LiO2 (NCAL) as symmetrical electrodes demonstrate remarkable ionic conductivity and power density at a temperature range of 400–600 °C. However, the stability issue of this type of CFCs has not been well investigated. In this work, we have demonstrated a commercially available samarium oxide (CSM) via a sodium doping method, that is, Na-doped samarium oxide (NDS) materials as functional electrolytes for robust CFCs. Results disclose that during the fuel cell operation, CSM could in situ-react with LiOH from the NCAL anode to cause cell degradation. Doped sodium ions in NDS could confine the LiOH that forms at the grain boundaries, which can result in several benefits, for example, to make the NDS electrolyte denser to prevent gas leakage, to enhance the CFC performance, and to ensure the CFC stability without the need for high-temperature sintering. The NCAL/NDS/NCAL-based fuel cell delivers a stable open circuit voltage over 1.0 V and maximum power density around 200 mW cm–2 for 144 h at 500 °C. Moreover, the optimized cell gives a stable power density of 140 mW cm–2 for 75 h at 500 °C. This work presents a methodology for developing advanced low-temperature CFCs using commercial samarium oxide as the functional electrolyte.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2025
·
IF 6.3
Wenjian Chan,Yu Mao,Mengyang Wang,Yuanyuan Huang,Yanmei Deng,Ziyang Ren,Ening Gu,Xianzhong Lin,Guowei Yang
The fabrication of kesterite Cu 2 ZnSn(S,Se) 4 (CZTSSe) solar cells based on fluorine-doped tin oxide (FTO) substrates, as an alternative to conventional molybdenum, is highly attractive for applications in semitransparent, bifacial and tandem photovoltaic devices. Although FTO exhibits phase stability during the high-temperature annealing process required for CZTSSe grain growth, its electrical conductivity decreases significantly, impairing carrier transport and limiting device performance. Addressing this issue necessitates lowering the annealing temperature without compromising the crystallinity of the CZTSSe absorber layer. In this study, we demonstrate the growth of high-crystallinity CZTSSe absorbers on FTO substrates at a reduced temperature of 500 °C, facilitated by silver (Ag) and sodium (Na) doping in the precursor film. The absorbers were fabricated from a 2-methoxyethanol-based molecular ink, and the annealing duration was systematically optimized. We found that the crystallinity and morphology of the CZTSSe layer are strongly influenced by annealing time. An optimal film morphology was achieved with a 15-min anneal, whereas shorter annealing (≤10 min) resulted in incomplete crystallization, and extended annealing (>20 min) promoted void formation within the absorber due to Ostwald ripening. Furthermore, the optimized annealing process reduces the interface defect density and broadens the depletion width of the device, leading to a record power conversion efficiency of 9.4 % for CZTSSe solar cells on bare FTO substrates. These results provide important insights for developing efficient bifacial CZTSSe solar cells.
研究领域:
材料科学
·
光伏技术
·
半导体物理
·
无机功能材料
·
能源材料
·
薄膜太阳能电池
·
固态器件
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Xuan-Yu Yang,He-Jie Wang,Hao-Nan Chen,Li-Juan Yue,Fei-Long Gong,Ke-Feng Xie,Shi-Zhong Wei,Yong-Hui Zhang
Electronic modulation of Pt sites is of great significance in catalytic reaction involved chemical engineering process. Alkali metal doping is a promising strategy to modify the d orbit of Pt, which can effectively affect the reaction between material and adsorbates, however, the relationship is still unclear. Here, we have rationally designed Pt-modified Na-doped WO 3 nanorods, and the electronic modulation of Pt can be finely modified by Na doping. The Pt-Na/WO 3 -Ar nanorods exhibit excellent H₂S sensing performance, with high response (R a /R g = 701 @ 1 ppm), low operating temperature (110 °C), and detection limit as low as 2.42 ppb. Experimental and theoretical results indicate that the introducing of Na effectively enhances the interaction between Pt nanoparticles (NPs) and WO 3 . Additionally, Na doping successfully modulate the d-band center of Pt, optimizing the adsorption and desorption processes during sensing. The synergistic effects of these components enable the Pt-Na/WO 3 -Ar sensor to exhibit outstanding H₂S sensing performance. Notably, the fabricated sensors are further used to monitor the hydrogen sulfide (H 2 S) of halitosis biomarkers, which holds significant application potential in environmental protection and medical diagnostics.
研究领域:
材料科学
·
传感器技术
·
纳米材料
·
表面化学
·
环境监测
·
医学诊断
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2022
·
IF 5.436
Shuqin Chang,Jipeng Fu,Xuan Sun,Guangcan Bai,Guoquan Liu,Kaina Wang,Ligang Xu,Qi Wei,Thomas Meier,Mingxue Tang
Ce3+-doped SrS phosphors with a charge-compensating Na+ addition were successfully synthesized via a solid-state reaction method, and the related X-ray diffraction patterns can be indexed to the rock-salt-like crystal structure of the Fm3̅m space group. SrS:(Ce3+)x (0.005 ≤ x ≤ 0.05) and SrS:(Ce3+)0.01,(Na+)y (0.005 ≤ y ≤ 0.030) phosphors were excited by 430 nm UV-Vis light, targeted to the 5d1 → 4f1 transition of Ce3+. The composition-optimized SrS:(Ce3+)0.01, (Na+)0.015 phosphors showed an intense broad emission band at λ = 430–700 nm. The doping of Na+ was probed by solid-state nuclear magnetic resonance. The 430 nm pumped white light-emitting diode structure fabricated with a combination of SrS:(Ce3+)0.01,(Na+)0.015 and Sr2Si5N8:Eu2+ phosphors shows a color-rendering index (Ra) of 89.7. The proposed strategy provides new avenues for the design and realization of novel high color quality solid-state LEDs.
研究领域:
材料科学
·
光电技术
·
固态照明
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Today Chemistry
·
2025
·
IF 6.7
Yongmin Duan,Dan Zhang,Shugang Li,Zhaojing Kuang,Keyi Gu,Junjie Zhang
Perovskite quantum dot (PQD) glass often suffers from poor control of nucleation and growth. In this study, we systematically explore the role of NaF doping (0–10 mol%) in regulating the network structure and in-situ crystallization behavior of CsPbBr 3 PQDs embedded in borosilicate glass. Moderate NaF (8 mol%) depolymerizes the network by increasing non-bridging oxygen and enlarges local free volume, which lowers the crystallization barrier from 52 kJ/mol to 46 kJ/mol and enables uniform in-situ crystallization within a narrow heat-treatment window. Consequently, the photoluminescence quantum yield rises from 10.3 % (undoped) to 87 % (8 mol%). The optimized glass maintains 96.5 % of its initial PL intensity after thermal cycling (25–200 °C), 92 % after 30 days of UV exposure, and 98 % after 30 days of water immersion. These findings highlight NaF's dual role as both a network modifier and a kinetic crystallization regulator, and provide a composition-temperature window for the design of high-efficiency, environmentally robust PQD glasses for optoelectronic applications.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）