JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 31
·期 23
·21272-21278
·
IF 2.22
Li Tianjing,Guo Wei,Shi Qingle
A-site rich perovskites Ba 2x CoMoO 6 ( x = 1, 1.1, 1.2, and 1.3) were synthesised by a solid-state reaction method. The as-prepared Ba 2.4 CoMoO 6 catalyst showed good catalytic activity towards oxygen evolution reaction (OER) activity with an overpotential of 420 mV at 10 mA cm −2 , which was enhanced by 100 mV compared with that of Ba 2 CoMoO 6 , with a low Tafel slope of 79 mV dec −1 , an obviously enhanced electrochemical active surface area value, and sharply improved mass and specific activities. The enhanced OER activity even surpassed the precious metal oxide IrO 2 and perovskite benchmark Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3-δ activities.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 6
·1002
·
IF 5.719
Sushu Wan,Yajie Zhu,Daocheng Hong,Yuxi Tian
One of the unique characteristics of semiconductors is the strong dependence of their properties on crystal defects and doping. However, due to the species diversity and low density, it is very difficult to control the type and concentration of the defects. In perovskite materials, crystal defects are randomly formed during the fast crystallization process, causing large heterogeneity of the samples. Here, in this work, we report a controllable method to introduce surface defects on CH3NH3PbI3perovskite materials via the interaction with 1,4-benzoquinone (BQ) molecules on the gas and solid interface. After the adsorption of BQ molecules on the perovskite surface, surface defects can be generated by photoinduced chemical reactions. The concentration of the defects can thus be controlled by precisely regulating the laser irradiation time. The concentration of the defects can be characterized by a gradually decreased PL intensity and lifetime and was found to influence the atmospheric response and the subsequent acetone-induced degradation of the materials. These results demonstrate that crystal defects in perovskite materials can be controllably introduced, which provides a possible way to fully understand the correlation between the nature and chemical structure of these defects.Keywords:lead halide perovskite;polycrystalline thin films;defect modification;defect concentration;optical microscopy
研究领域:
材料科学
·
物理化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Advanced Optical Materials
·
2023
·Vol. 11
·期 15
·2203140
·
IF 9
Jing Yang,Ziyu Wang,Lu Liu,Le Wang,Zhen Chang,Jianxun Li,Kai Wang,Shengzhong (Frank) Liu
Organic lead halide perovskites are regarded as qualified candidates for the photoactive layers of semitransparent solar cells. The critical aspect of boosting the performance of semitransparent perovskite solar cells (PSCs) to a higher level lies in preparing perovskite films with both excellent photoelectric properties and high transmittance. Herein, it is realized that, through theoretical analysis, perovskite materials with bandgap of 2.00–2.30 eV are suitable for the preparation of semitransparent PSCs that can simultaneously achieve low thermal-energy loss, allow transmission of light for high photopic response, and provide acceptable transmittance for photovoltaic greenhouses. Then the study aims at improving the crystallinity and morphology of wide-bandgap perovskite films by using additive engineering. As such, PSCs with absorber bandgaps of 2.02, 2.16, and 2.32 eV deliver maximum power-conversion efficiencies of 12.08%, 9.17%, and 8.42%, respectively. Then the corresponding semitransparent PSCs are crafted with average transmittance of light detectable by the human eye of 9.41%, 23.26%, and 43.47%, respectively. Furthermore, the crop growth factors are predicted to be 21.25%, 29.48%, and 37.07%, respectively. This work gives full play to bandgap modulation in the fabrication of semitransparent PSCs, which will broaden the application of semitransparent solar cells in the field of building integrated photovoltaics.
研究领域:
材料科学
·
光伏技术
·
能源转换
✓ 已验证
产品关联
DOI
高影响因子
Advanced Powder Materials
·
2023
·
IF 0
Cheng Li,Yatian Deng,Liping Yang,Bo Liu,Dong Yan,Liyuan Fan,Jian Li,Lichao Jia
Sr 2 FeCo 0.2 Ni 0.2 Mo 0.6 O 6-δ (SFCNM) and Sr 2 FeNi 0.4 Mo 0.6 O 6-δ (SFNM) were prepared as the hydrogen electrode materials for solid oxide cells (SOCs) and comparatively investigated by density function theory (DFT) and experiments to demonstrate the benefit of Co addition. The reduced SFCNM (R-SFCNM) and SFNM (R-SFNM) contain exsolved Fe–Co–Ni and Fe–Ni nanoparticles, respectively. DFT indicates that Fe–Co–Ni has optimized combination of the d-band center (descriptor of catalyst activity) and adsorption behavior for H 2 O, H 2 , H, and OH. The cell with SFCNM hydrogen electrode, La 0.8 Sr 0.2 Ga 0.8 Mg 0.2 O 3-δ (LSGM) electrolyte, and La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ (LSCF) oxygen electrode (Cell-SFCNM) demonstrates a higher performance than that with an SFNM hydrogen electrode (Cell-SFNM) at temperatures between 700 and 850 °C in both solid oxide fuel cell (SOFC, 3% H 2 O-97% H 2 /air) and solid oxide electrolysis cell (SOEC, 20% H 2 O-80% H 2 /air) modes. At 850 and 700 °C, the peak power density is 1.23 and 0.48 W·cm −2 in SOFC mode, while the current density is 1.25 and 0.37 A·cm −2 at 1.3 V in SOEC mode, respectively. The performance degradation rates at 750 °C are 0.17 mV·h −1 in SOFC and 0.15 mV·h −1 in SOEC modes within 150 h, which are improved by Co doping.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Juntao Pan,Xiyong Chen,Donglin Cai,Ze Wei,Tingdong Gong,Gang Han,Yihui Liu,Jianhua Zhao,Toyohisa Fujita
A set of single-phase perovskite materials, La 0.5 Pr 0.5 BaCo 2- x Fe x O 5+ δ (LPBCF- x, 0 < x ≤ 1.0) were prepared employing A/B site co-doping strategy with double lanthanide doping at A-site and partial replacement of Co with Fe at B-site. The corresponding thermal expansion behavior, thermochemical stability, electrical conductivity, and cathodic electrochemical impedance of these materials were systematically investigated. The experimental findings revealed that the doping of Fe into the B site of La 0.5 Pr 0.5 BaCo 2 O 5+ δ materials can effectively decrease the thermal expansion coefficient (TEC), with most significant reduction at x ≤ 0.4. Excellent thermochemical stability of LPBCF- x materials with Ce 0.9 Gd 0.1 O 2- δ (GDC) was also verified through co-firing the powder mixtures at 1000 °C. Rather, doping of Fe generally results in the decrease of electrical conductivity and the increase of surface specific polarization resistance, LPBCF- x materials with low Fe content demonstrated comparable excellent overall conductivity with low activation energy and low surface specific polarization resistances in various conditions compared to the non-Fe-doped LPBCF-0.0. Especially, LPBCF-0.2 can provide the best overall performance combing the evaluation of thermo-mechanical, electrical and electrochemical properties. Further analysis of the electrochemical impedance spectra revealed that the electron charge transfer or the dissociation of absorbed oxygen, depending on the temperature, is the primary rate-determining step in the oxygen transport process through LPBCF- x materials.
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
SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Dongwei Feng,Peng Huang,Yunfei Miao,Axin Liang,Xuan Wang,Bo Tang,Huipeng Hou,Mingxing Ren,Shimeng Gao,Lina Geng,Aiqin Luo
Developing cost-effective, ease-to-use and sensitive cholesterol sensors is of great importance. Photoelectrochemical (PEC) sensor has exhibited their potential with low cost, simple instrumentation, easy miniaturization, and high sensitivity. Organometal lead halide perovskites (MAPbX 3 ) with exceptional opto-electronic properties have been appealing materials for optoelectronic devices. Whereas the extreme sensitivity of MAPbX 3 towards even moisture has always restricted their application in biological use. Here we report a novel MAPbX 3 photoelectrochemical cholesterol sensor with water stability. The titanium dioxide inverse opal (TiO 2 IOPCs) and CH 3 NH 3 PbBr 3 quantum dot heterojunction on ITO glass exhibited a remarkably increased photoelectric current density of approximately 40 μA/cm 2 . The further encapsulation within the imprinted polymer presented high selectivity towards cholesterol and significantly improved the stability of perovskites as well. Linear detection of cholesterol in buffer was achieved with the detection limit of 2.51 × 10 - 10 mol/L, lower than that of the reported cholesterol PEC sensor in aqueous buffer. Recovery rates in serum were also obtained with the cholesterol concentration lower than the reported imprinted polymer based (photo)electrochemical sensor. Additionally, the photocurrent intensity under continuous emission was maintained at 80% after immersing this sensor in an aqueous solution for 500 s. The storage stability was more than 20 days. Here we present the first MAPbX3 perovskite-based sensor applicable in aqueous samples with super sensitivity and selectivity, which promote the perovskite nanomaterial-mediated sensing of biologically important species.
研究领域:
生物医学工程
·
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 30
·14398-14412
·
IF 4.682
Zhou Dacheng,Yuan Chuan,Chen Xiyong,Chen Fangze,Xiong Xueqing,Liu Yihui,Yan Jialin,Fujita Toyohisa
Double-perovskite materials La 1− x Pr x BaCo 2 O 5+ δ (LPBCO), suitable for the application of intermediate-temperature solid oxide fuel cell (IT-SOFC) and other electrochemical devices, were successfully prepared through solid-state reaction method. The effects of La and Pr doping ratios on the crystallographic structure, thermochemical stability, thermal expansion, electrical conductivity, and electrochemical polarizations were analyzed and discussed. The X-ray diffraction results show that the crystal structure changes from single perovskite to double perovskite with the increase in Pr doping content. LPBCOs present excellent chemical stability with conventional electrolyte GDC at less than 1100 °C. The thermal expansion can be effectively reduced upon doping of Pr. The materials demonstrate high electrical conductivity even under relatively low temperatures, i.e., LP-73 ( x = 0.3 with single perovskite) has the highest conductivity at 1680 S/cm at 400 °C. Among the double-perovskite compositions, LP-55 presents the highest performance in electrical conductivity though. Analysis of the electrochemical impedance spectra of LPBCOs symmetric cells reveals low area specific polarization resistances for these double-lanthanide-doped double-perovskite materials, and the charge transfer is determined as the dominating sub-process for the oxygen transport through the materials. All the findings show that La 1− x Pr x BaCo 2 O 5+ δ possesses excellent oxygen reduction activity and is promising for the application in IT-SOFCs.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
ACS Nano
·
2017
·
IF 13.942
Liang Li,Na Liu,Ziqi Xu,Qi Chen,Xindong Wang,Huanping Zhou
Mixed anion/cation perovskites absorber has been recently implemented to construct highly efficient single junction solar cells and tandem devices. However, considerable efforts are still required to map the composition–property relationship of the mixed perovskites absorber, which is essential to facilitate device design. Here we report the intensive exploration of mixed-cation perovskites in their compositional space with the assistance of a rational mixture design (MD) methods. Different from the previous linear search of the cation ratios, it is found that by employing the MD methods, the ternary composition can be tuned simultaneously following simplex lattice designs or simplex-centroid designs, which enable significantly reduced experiment/sampling size to unveil the composition–property relationship for mixed perovskite materials and to boost the resultant device efficiency. We illustrated the composition–property relationship of the mixed perovskites in multidimension and achieved an optimized power conversion efficiency of 20.99% in the corresponding device. Moreover, the method is demonstrated to be feasible to help adjust the bandgap through rational materials design, which can be further extended to other materials systems, not limited in polycrystalline perovskites films for photovoltaic applications only.
研究领域:
材料科学
·
光伏技术
·
能源研究
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF POWER SOURCES
·
2024
·
IF 8.1
Min Zhang,Yuanyuan Li,Zhihong Du,Yang Zhang,Hailei Zhao
B-site double perovskite Sr 2 FeMo 0.6 Mg 0.25 Ga 0.15 O 6−δ (SFMMG) is reported as a promising fuel electrode for reversible solid oxide cell. The SFMMG material shows excellent structural stability in both oxidizing and reducing atmospheres, possesses an appropriate thermal expansion coefficient , as well as excellent redox cycle stability. The result confirms that the Mg 2+ and Ga 3+ tend to occupy the B-site while some Fe ions moves to the B′-site, creating lots of Fe B – O –Fe B’ anti-site defects in the lattice. As a result, a high electrical conductivity value of 36.0 S cm −1 is obtained at 800 °C in H 2 . Besides, the SFMMG electrode exhibits good catalytic activity toward hydrogen oxidation/evolution reaction, as confirmed by the low polarization resistance of 0.237 Ω cm 2 at 800 °C in H 2 . With SFMMG as the fuel electrode, the La 0.8 Sr 0.2 Ga 0.8 Mg 0.2 O 3-δ (300 μm)-supported single cell exhibits a peak power density of 1073 mW cm −2 in fuel cell mode and an electrolysis current density of 1192 mA cm −2 in electrolysis cell mode at 900 °C. In addition, the single cell shows stable performance during 100 h operation under 0.75 V at 800 °C.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
Materials Research Express
·
2023
·Vol. 10
·期 7
·076301
·
IF 2.3
Xiangcheng Cai,Peng Tu,Yansong Ai,Hongshen He,Peng Shen,Yuanming Zhou,Fei Mei
Multi-color light-emitting materials are essential lighting and displays. In this study, mixed halide system was applied to precisely tune the bandgap of CH3NH3Pb(BrxI1-x)3, thus regulating the emission wavelength. PEABr was employed to change the phase structure and morphology of CH3NH3Pb(BrxI1-x)3 perovskite thin films and improve the performance of multi-color perovskite light-emitting diodes (PeLEDs). Theoretical simulations through first-principles calculations and experiments demonstrate that multi-color PeLEDs can be achieved by adjusting the ratio of bromine (Br) and iodine (I) atoms in the CH3NH3Pb(BrxI1-x)3 perovskite. The maximum luminance of PEABr-modified green PeLEDs reached 7108 cd m−2, with a maximum current efficiency of 8.25 cd A−1 and a maximum external quantum efficiency (EQE) of 1.62%, which were greatly improved compared to the reference device without PEABr. In addition, the luminance of orange-yellow and red mixed-halide PeLEDs both exceed 100 cd m−2. The results demonstrate that the use of PEABr additive can effectively control the morphology of CH3NH3Pb(BrxI1-x)3 crystals, and high-performance multi-color light-emitting devices can be achieved by combining with mixed halide system. The electroluminescence spectra showed that the emission range of the devices covered the wavelength region of 520–720 nm, demonstrating their good application prospects in the field of multi-color displays.
研究领域:
材料科学
·
光学工程
·
半导体物理
✓ 已验证
DOI
高影响因子
CHEMISTRY OF MATERIALS
·
2022
·
IF 10.508
Qian Liang,Yu Zhao,Jian-de Chen,Jia-jun Dai,Xingyu Ding,Zhen Tong,Shi-jun Xie,Jing Zhang,Zhe-hui Zhou,Jun-Tao Li,Jian-Feng Li,Yao Zhou
Anti-perovskites represent a type of newly arising functional materials with a well-defined cubic lattice crystal structure; they provide an excellent entity for studying structure–activity relationship in heterogeneous catalysis. Herein, nitride-based anti-perovskite CuNNi3 was synthesized, and its catalytic properties in electroreduction of carbon dioxide (CO2RR) to syngas were explored for the first time. The introduction of N into the body center of the face-centered cubic cell of CuNi3 was found to create abundant Lewis basic sites with various strengths and thus favored stronger adsorption of the relevant critical species, thus leading to significant improvement in the efficiency of CO2RR and hydrogen reduction compared with that of CuNi3. More importantly, when a thin CuNNi3 nanoshell is coated on a CuNi3 alloy core, significant nanosizing and interfacial interaction effects are noticed, which change the catalytic behaviors of the anti-perovskite. On one hand, the nanosizing effect leads to occurrence of Ni2+ species with a higher oxidative state and consequently deactivates the weak Lewis basic sites in the CuNNi3 nanoshell, which accordingly inhibits hydrogen evolution; the CuNi3@CuNNi3 nanocomposite thus delivers CO Faradaic efficiency up to 96% in comparison to a value of 70% yielded by the bulky counterpart. On the other hand, evident interfacial electron delocalization from the CuNi3 alloy core to the CuNNi3 nanoshell was observed, which was found to increase the N escape energy in the cubic cell of CuNNi3 and consequently enhance its chemical stability; as a result, the CuNi3@CuNNi3 nanocomposite displays much improved catalytic stability compared with the bulky counterpart in CO2RR. This work for the first time explores the interesting electrocatalytic behavior of nitride-based anti-perovskites in electrochemical reduction of CO2, which spells a grand opportunity for the structure–relationship study in CO2RR.
研究领域:
材料科学
·
电化学催化
·
纳米技术
✓ 已验证
DOI
高影响因子
Science Advances
·
2022
·Vol. 8
·期 30
·
IF 14.957
Min Lu,Yao Zheng,Yang Hu,Bolong Huang,Deguang Ji,Mingzi Sun,Jianyi Li,Yong Peng,Rui Si,Pinxian Xi,Chun-Hua Yan
The regulation of mechanism on the electrocatalysis process with multiple reaction pathways is more efficient and essential than conventional material engineering for the enhancement of catalyst performance. Here, by using oxygen evolution reaction (OER) as a model, which has an adsorbate evolution mechanism (AEM) and a lattice oxygen oxidation mechanism (LOM), we demonstrate a general strategy for steering the two mechanisms on various LaxSr1−xCoO3−δ. By delicately controlling the oxygen defect contents, the dominant OER mechanism on LaxSr1−xCoO3−δ can be arbitrarily transformed between AEM-LOM-AEM accompanied by a volcano-type activity variation trend. Experimental and computational evidence explicitly reveal that the phenomenon is due to the fact that the increased oxygen defects alter the lattice oxygen activity with a volcano-type trend and preserve the Co0 state for preferably OER. Therefore, we achieve the co-optimization between the activity and stability of catalysts by altering the mechanism rather than a specific design of catalysts.
研究领域:
电化学
·
催化科学
✓ 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）