Surfaces and Interfaces
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2024
·
IF 5.7
Wenxu Zhang,Wei Li,Huixing Yang,Linlin Hou,Yongzhuo Yu,Yangyang Jiang,Chaoyu Lv,Yuxin Huang
We propose a potential solution to the problem of severe recombination of photogenerated electron-hole pairs in composite catalysts. The g-C 3 N 5 has better electronic properties and photocatalytic efficiency than g-C 3 N 4 , and In 2.77 S 4 is a typically sulfur-deficient sulfide with stable structure and strong visible light absorption. However, the In 2.77 S 4 /g-C 3 N 5 composite catalyst has severe recombination of photogenerated electron-hole pairs, which limits its performance. To solve this problem, we introduced NCDs (nitrogen-doped carbon dots) into g-C 3 N 5 to prepare hybrid material, which subsequently combined with In 2.77 S 4 . The high-efficiency S-scheme In 2.77 S 4 /NCDs-(g-C 3 N 5 ) heterojunction was prepared by electrostatic self-assembly to prevent the thermal decomposition of g-C 3 N 5 . Photocatalytic experiments show that In 2.77 S 4 /NCDs-(g-C 3 N 5 ) composite has excellent photodegradation efficiency of rhodamine B (94.23 %), high photocatalytic H 2 production (7134 μmol·g −1 h −1 ), and good reusability in the visible light. The H 2 evolution rate of In 2.77 S 4 /NCDs-(g-C 3 N 5 ) composite is about 30.10, 3.89 and 3.08 folds than In 2.77 S 4 , g-C 3 N 5 and In 2.77 S 4 /g-C 3 N 5 , respectively. The photoluminescence spectroscopy (PL) and the time-resolved fluorescence decay (TRF) indicated a substantial reduction in photogenerated carrier recombination of In 2.77 S 4 /NCDs-(g-C 3 N 5 ) compared to In 2.77 S 4 /g-C 3 N 5 . Taking advantage of the high conductivity of NCDs , the electron-highways were constructed in heterojunctions, which accelerates the interfacial depletion of useless electron-hole pairs and reserved more strong redox carriers. In addition, we inferred a possible energy band structure for In 2.77 S 4 /NCDs-(g-C 3 N 5 ) heterojunction based on the energy band bending theory. This work provides an expandable idea for improving the utilization efficiency of photogenerated carriers by constructing electron-highways in heterojunctions.
研究领域:
材料科学
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环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
Science Advances
·
2023
·Vol. 9
·期 44
·
IF 13.6
Tao Yu,Haoyu Li,Yuankai Liu,Jingchang Li,Jiaming Tian,Zhaoguo Liu,Yuan Rao,Shaohua Guo,Haoshen Zhou
All-solid-state batteries (ASSBs) represent a promising battery strategy to achieve high energy density with great safety. However, inadequate kinetic property and poor interfacial compatibility remain great challenges, which impede their practical application. A prototype of dual-ion conductor of Li+ synchronized with Cu+ unlocks a four-electron redox reaction with high reversibility and fast kinetics. As a result, the constructed ASSB exhibited a high reversible capacity of 603.0 mA·hour g−1 and an excellent cycling retention of 93.2% over 1500 cycles. Moreover, because of the ion highway connecting active materials and catholytes constructed by dual-ion conductor, remarkable temperature tolerance (−60°C) and excellent rate performance (231.6 mA·hour g−1 at 20 mA cm−2) were achieved. The superior electrochemical performance can be ascribed to the migration pathway with small energy barrier and low tortuosity once the Cu+ introduced into Li6PS5Cl. This work creates a unique perspective of ASSBs with dual-ion conducting strategy, thus inspiring a potential developing strategy of state-of-the-art ASSBs.
研究领域:
储能
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材料科学
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电化学
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固态化学
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电池技术
✓ 已验证
DOI
高影响因子
eScience
·
2021
·
IF 0
Bin Tang,Yibo Zhao,Zhiyi Wang,Shiwei Chen,Yifan Wu,Yuming Tseng,Lujiang Li,Yunlong Guo,Zhen Zhou,Shou-Hang Bo
The practical energy density of solid-state batteries remains limited, partly because of the lack of a general method to fabricate thin membranes for solid-state electrolytes with high ionic conductivity and low area-specific resistance (ASR). Herein, we use an ultrahigh concentration of a ceramic ion conductor (Na 3 SbS 4 ) to build an ion-conduction “highway”, and a polymer (polyethylene oxide, 2 wt%) as a flexible host to prepare a polymer-in-ceramic ion-conducting membrane of approximately 40 μm. Without the use of any salt (e.g., NaPF 6 ), the resulting membrane exhibits a threefold increase in electronic ASR and a twofold decrease in ionic ASR compared with a pure ceramic counterpart. The activation energy for sodium-ion transport is only 190 meV in the membrane, similar to that in pure ceramic, suggesting ion transport predominantly occurs through a percolated network of ion-conducting ceramic particles. The salt-free design also provides an opportunity to suppress dendritic metal electrodeposits, according to a recently refined chemomechanical model of metal deposition. Our work suggests that salt is not always necessary in composite solid-state electrolytes, which broadens the choice of polymers to allow the optimization of other desired attributes, such as mechanical strength, chemical/electrochemical stability, and cost.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
FUEL PROCESSING TECHNOLOGY
·
2022
·
IF 8.129
Hao Chen,Xin Su,Fengyu Sun,Jingjing He,Zhanming Chen,Peng Zhang,Hongming Xu
In this study, the combustion and emission characteristics of a diesel engine fueled with diesel cyclopentanol blends were experimentally studied through the engine bench test and real-time vehicle test. The results indicated that the cyclopentanol addition weakened the premixed combustion process and accelerated the diffusion combustion process, resulting in an increased peak cylinder pressure and peak combustion temperature . In addition, with the increase of cyclopentanol addition, the ignition delay prolonged, the combustion duration shortened and the heat released more concentratedly. The addition of cyclopentanol decreased both the PM number and volume concentrations significantly, while increased the NOx emission due to the increased peak combustion temperature. At 2000 r/min, CP10 had little effect on inhibiting the nucleation ultrafine particles (≤ 50 nm). Urban, rural and highway roads were considered for on-road real-time vehicle test. The results were consistent with the engine bench test. For urban, rural, and highway areas, the average PN emissions of CP20 were 4.948 × 10 6 , 4.707 × 10 6 , and 3.314 × 10 6 per cm 3 , respectively, while those for diesel were 5.755 × 10 6 , 5.547 × 10 6 , and 4.058 × 10 6 per cm 3 , respectively.
研究领域:
机械工程
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汽车工程
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环境科学
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燃烧科学
✓ 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）