ACS Applied Materials & Interfaces
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2021
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IF 9.229
Biwen Duan,Licheng Lou,Fanqi Meng,Jiazheng Zhou,Jinlin Wang,Jiangjian Shi,Huijue Wu,Yanhong Luo,Dongmei Li,Qingbo Meng
The post-heating treatment of the CZTSSe/CdS heterojunction can enhance the interfacial properties of kesterite Cu2ZnSn(S,Se)4 (CZTSSe) solar cells. In this regard, a two-step annealing method was developed to enhance the heterojunction quality for the first time. That is, a low-temperature (90 °C) process was introduced before the high-temperature treatment, and 12.3% efficiency of CZTSSe solar cells was achieved. Further investigation revealed that the CZTSSe/CdS heterojunction band alignment with a smaller spike barrier can be realized by the two-step annealing treatment, which assisted in carrier transportation and reduced the charge recombination loss, thus enhancing the open-circuit voltage (VOC) and fill factor (FF) of the devices. In addition, the two-step annealing could effectively avoid the disadvantages of direct high-temperature treatment (such as more pinholes on CdS films and excess element diffusion), improve the CdS crystallization, and decrease the defect densities within the device, especially interfacial defects. This work provides an effective method to improve the CZTSSe/CdS heterojunction properties for efficient kesterite solar cells.
研究领域:
材料科学
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光伏技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Surfaces and Interfaces
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2024
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IF 5.7
Bohan Zhang,Chang Wen,Mingtao Xu,Qian Liu,Zhiyin Zhang,Hongbo Huang,Dapeng Wang,Zhengkai Tu
The development of acid-sensitive OER (Oxygen Evolution Reaction) electrocatalysts based on ruthenium oxides is a crucial step toward achieving large-scale hydrogen production in low-cost Proton Exchange Membrane (PEM) electrolyzers. However, a major challenge in this field is to overcome the tendency of ruthenium-based metal oxide dissolving in acidic environments, which affects long-term stability. In this study, we employed MIL-88B(Cr) as a precursor and used a two-step annealing method to prepare trimetallic metal oxides Cr 0.5 Co x Ru 0.5-x O 2-δ . Detailed experimental measurements demonstrate that the introduction of Co reduced the volume of individual catalyst crystallites without disrupting the rutile crystal structure and inherent activity of CrO 2 @RuO 2 . Simultaneously, Co and Cr doping lowered the oxidation state of Ru within the catalyst system. Lower oxidation states of Ru are more stable during the OER reaction, ensuring the stability of this catalyst to be at least 100 hours. Furthermore, Co incorporation raises the energy required for oxygen vacancy formation, reduced the involvement of lattice oxygen, and enhanced the catalyst's activity. The catalyst Cr 0.5 Co 0.17 Ru 0.33 O 2-δ with the best performance exhibited the overpotential of only 224 mV at 10 mA cm -2 in 0.5 M H 2 SO 4 . This study offers a viable strategy for developing highly active and stable catalysts in acidic media by controlling the electronic structure of RuO 2 .
研究领域:
材料科学
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电化学
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催化
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能源材料
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
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2025
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IF 17.7
Yun-Fei Xia,Bo Liu,Zi-Yu Zhang,Zi-Gang Zhao,Pan Guo,Si Lin,Bing Liu,Yan Wang,Yun-Long Zhang,Lei Zhao,Li-Guang Wang,Zhen-Bo Wang
In this paper, we report the design of ultrafine ordered PtFeZn ternary intermetallics uniformly supported on ZIF-8-derived Zn,N-codoped graphitic carbon (ZnNC) via a green aqueous impregnation method followed by a two-step annealing protocol (H 2 /Ar, 600 and 800 °C) to circumvent the sintering issues imposed by conventional thermodynamics. Physical characterizations (X-ray diffraction, high-angle annular dark-field scanning transmission electron microscopy, X-ray absorption spectroscopy) and theoretical calculations reveal that low-temperature annealing at 600 °C stabilizes sub-nano disordered PtFe alloys via the strong metal-support interactions (SMSI) between Zn in ZnNC and Pt precursors, while high-temperature treatment at 800 °C promotes Zn diffusion from the support into the alloy bulk and simultaneously triggers the disorder-to-order phase transition. The as-prepared ZnNC-15PtFeZn exhibits an initial mass activity of 0.769 mA/μg Pt and retains 61.7% of its activity after 30000 cycles of accelerated stress testing (AST). Notably, when used as a cathode catalyst in MEA, ZnNC-15PtFeZn achieves superior power density (2.018 W/cm 2 under H 2 -O 2 ) at half the Pt loading (0.05 mg/cm 2 ) of state-of-the-art commercial Pt/C, highlighting its potential for low-Pt PEMFCs. Density functional theory confirms that Fe enhances ORR activity via ligand effects, while Zn strengthens Pt-Fe/Zn bonding (elevating vacancy formation energies), thereby improving structural stability. This mild, scalable aqueous impregnation strategy offers a general approach for synthesizing multi-component ordered alloys in electrocatalysis.
研究领域:
材料化学
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电催化
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纳米材料
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能源化学
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物理化学
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燃料电池
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表面科学
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计算化学
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2023
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IF 13.3
Xiaoyu Gu,Chengwei Shan,Xiaowei Xu,Qian Liu,Aung Ko Ko Kyaw
All inorganic perovskite based on CsPbI 2 Br has attracted significant attention due to its relatively thermal stable structure compare to its hybrid counterparts. With a wide bandgap of 1.9 eV and excellent light absorption capability, it has been extensively explored for applications in indoor photovoltaics and as a front absorber in tandem devices. However, the uncontrollable crystallization process during solvent evaporation and thermal annealing leads to both macroscopic defects like cracks and microscopic defects such as voids. In this study, a metastable adduct with lead (II) halides by incorporating 4-tert-butyl pyridine as a volatile Lewis base monodentate ligand in the precursor solution is formed. The strategic preferential decomposition of the adduct during the early-stage low-temperature annealing facilitated the desorption of lead (II) halides, inducing antisolvent-free heterogenous nucleation. This, in turn, promoted crystal growth during subsequent high-temperature annealing, resulting in dense films with low defect density. As a result, a maximum open-circuit voltage of 1.30 V is achieved with the champion power conversion efficiency of 16.5% in CsPbI 2 Br-based perovskite solar cell. The work reveals a new mechanism of using Lewis acid-base adduct to obtain high quality perovskite films other than hindering crystallization in traditional way.
研究领域:
材料科学
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光伏技术
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太阳能
✓ 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）