CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Zhijie Zhang,Zhongliang Dong,Ying Jiang,Yaoqing Chu,Jiayue Xu
Construction of S-scheme heterojunctions has been regarded as an appealing strategy to explore efficient photocatalysts for artificial photosynthesis. Herein, a unique 0D/1D S-scheme heterojunction of CsPbBr 3 /AgBr (CPB/AgBr) was developed by assembling CsPbBr 3 nanocrystals (NCs) onto AgBr nanorods. The effective S-scheme electron transfer between CsPbBr 3 and AgBr boosted charge separation while also maintained the strongly reductive electrons for CO 2 reduction, as proved by electron spin resonance (ESR), steady state photoluminescence (PL), time-resolved photoluminescence (TRPL), etc. As a consequence, The CPB/AgBr heterojunction achieved remarkable photocatalytic performance in CO 2 reduction, with a high electron consumption rate (R electron ) of 141.4 μmol g −1 h −1 , which was 3.0 times that of pristine CsPbBr 3 and 1.65 times that of AgBr, respectively. The current work presents a novel lead halide perovskite (PVK) based S-scheme heterojunction, which is expected to provide some insights into the development of new efficient photocatalysts based on PVKs for solar fuel applications.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Yuelong Xu,Jingyue Wang,Shasha Wang,Zuozhao Zhai,Bin Ren,Zhi Tian,Lihui Zhang,Zhenfa Liu
Multifunctional electrocatalysts are desirable for overall water splitting and zinc-air batteries. In this work, N, S co-doped carbon nanotubes (CNT-NS) with a plentiful of defects were obtained through a novel molecular-level codoped and lattice defect construction method. Thiamine hydrochloride and thiocarbamide were adopted as new precursors in situ doping N and S into multi-walled CNTs surfaces, and lattice defects were constructed by in situ chemical etching using ammonium chloride and ammonium bicarbonate . These surface defects and N,S biatom co-doping synergistic effects can accumulate the CNT-NS to exhibit the superior behavior for electrocatalysis of water splitting and zinc-air batteries. The overpotential for overall water splitting was 1.61 V and the specific capacity for zinc-air batteries was 781 mA h g −1 , which was superior to previous works. According to the Operando Raman spectroscopy measurements, the S atoms can serve as the intrinsic catalytic sites for HER and OER , and the defective CNT structures could enhance the catalytic kinetics by the electron-transfer process. Further, density functional theory (DFT) results also indicated the contribution of binary atoms co-doping for low ΔG H∗ values. Therefore, this work provides the valuable reference for rational design/construction for metal-free catalysts of overall water splitting.
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LANGMUIR
·
2021
·
IF 3.882
Bowen Liu,Chuanbiao Bie,Yong Zhang,Linxi Wang,Youji Li,Jiaguo Yu
The design of photocatalysts with hierarchical pore sizes is an effective method to improve mass transport, enhance light absorption, and increase specific surface area. Moreover, the construction of a heterojunction at the interface of two semiconductor photocatalysts with suitable band positions plays a crucial role in separating and transporting charge carriers. Herein, ZIF-8 and urea are used as precursors to prepare hierarchically porous ZnO/g-C3N4 S-scheme heterojunction photocatalysts through a two-step calcination method. This S-scheme heterojunction photocatalyst shows high activity toward photocatalytic H2O2 production, which is 3.4 and 5.0 times higher than that of pure g-C3N4 and ZnO, respectively. The mechanism of charge transfer and separation within the S-scheme heterojunction is studied by Kelvin probe, in situ irradiated X-ray photoelectron spectroscopy (ISI-XPS), and electron paramagnetic resonance (EPR). This research provides an idea of designing S-scheme heterojunction photocatalysts with hierarchical pores in efficient photocatalytic hydrogen peroxide production.
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NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 46
·期 1
·228-238
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IF 3.591
Xinyu Liu,Jing Xu,Lijun Ma,Ye Liu,Linying Hu
The construction of heterojunctions can effectively improve the electron transport rate and photocatalytic activity. In this work, nanoflower-like S-scheme heterojunction MoS2/NiAl-LDH was successfully synthesized. The results indicated that the hydrogen yield of the MoS2/NiAl-LDH composite catalyst reached 229.5 μmol in 5 hours under visible light irradiation by adjusting the pH value of the sacrificial agent and the amount of eosin. The crystal structure and morphological characteristics of the composite were analyzed by XRD, SEM and TEM. The visible light response degree and charge separation and transfer rates of photogenerated carriers of the composite were analyzed by UV-Vis DRS, PL and electrochemistry. The electronic transfer path was also analyzed by XPS. The construction of S-scheme heterojunctions can realize effective separation of electron–hole pairs and ensure that the photo-induced carriers with the strongest redox ability can be retained to participate in the photocatalytic reaction. In addition, the feasible mechanism of photocatalytic hydrogen evolution is given. This work will provide different insights into the enhancement of hydrogen evolution by heterojunctions formed by binary semiconductors.
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Solar RRL
·
2021
·Vol. 6
·期 1
·2100778
·
IF 8.582
Hongling Guo,Rutao Meng,Long Hu,Chun-Ho Lin,Yali Sun,Yue Liu,Jianyu Wu,Zhan Shen,Dewei Chu,Gang Wang,Li Wu,Guangxing Liang,Shifu Xiong,Fangfang Liu,Yi Zhang,Tom Wu
In spite of the merits such as Earth abundance and high performance, Cu 2 ZnSn(S,Se) 4 (CZTSSe) solar cells suffer from unfavorable Sn Zn antisite defects and complexes, which act as nonradiative recombination centers and deteriorate the open-circuit voltage ( V OC ). Therefore, the management of Sn composition is the prerequisite for achieving high-efficiency CZTSSe photovoltaic devices. At present, the Sn-related composition and defect modifications at different selenization pressures remain unclear, which restrain the development of efficient kesterite solar cells. Herein, a facile yet effective strategy to accurately adjust the Sn content in CZTSSe films by simply optimizing the selenization pressure is demonstrated. Compared with the widely used atmospheric pressure, it is unveiled that the appropriate negative pressure (0.7 atm) can tailor the optimal Sn content in the absorber layer, influencing both the Sn-related defects and the microstructures. In contrast, a lower (0.4 atm) and a higher (1.3 atm) selenization pressure results in undesirable deep Cu Sn defects and a Sn(S,Se) 2 secondary phase, respectively. A champion device fabricated at this optimal selenization pressure (0.7 atm) exhibits a power conversion efficiency of 11.32% with a V OC of 0.496 V. This study paves the path toward highly efficient kesterite solar cells by tailoring the composition-dependent defects.
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Journal of Materials Chemistry A
·
2023
·Vol. 12
·期 5
·2760-2770
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IF 11.9
Binchao Shi,Yue Wang,Ertai Liu,Shilin Mei,Chang-Jiang Yao
The fast capacity decay and limited cycling life are the two main issues that hinder the practical applications of lithium–sulfur batteries. They are mainly caused by the shuttle effect of polysulfide species and the growth of big lithium dendrites occurring separately on the cathode and anode sides. To simultaneously tackle these problems, we explore a multifunctional interlayer integrating the aligned nanochannel structure of an anodic aluminum oxide (AAO) membrane with porous 1T MoS2 nanotubes (namely MoS2@AAO). Benefiting from the high electronic conductivity, sulfiphilic and lithiophilic properties of 1T MoS2, and the positive surface plus low tortuosity of the straight channels of AAO, the designed interlayer not only guarantees rapid ion/electron transfer and efficacious suppression of the polysulfide shuttle, but also achieves uniform and stable lithium deposition during cycling. Consequently, the MoS2@AAO interlayer exhibits a high capacity retention of 99.6% at 0.2C after 500 cycles and 90.6% at 1.0C after 1000 cycles. The prototype cathode with a sulfur loading of 5 mg cm−2 was also investigated, which exhibited over 96% retention of the initial discharge capacity at 0.1C after 50 cycles. This work provides a new solution for simultaneously stabilizing both the lithium anode and sulfur cathode via an integrating approach.
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Carbon Letters
·
2023
·
IF 4.5
Yang Yang,Hu Huali,Ai Jixing,Wang Hong,Du Haijun
Sulfamonomethoxine (SMM) is widely used to inhibit Gram-positive and Gram-negative bacteria, and improper use of SMM is detrimental to human health and ecological stability. Therefore, a sensitive determination method is of great importance for monitoring SMM residues in water, meat, milk, eggs, etc. Herein, a Pt-functionalized S-doped graphitic carbon nitride (Pt/S-g-C 3 N 4 ) was constructed for the electrochemical determination of SMM. The as-developed Pt 3 /S 3 -g-C 3 N 4 sensor showed a significant SMM determination performance. The electrochemical oxidation of SMM on Pt 3 /S 3 -g-C 3 N 4 /GCE involves two electron transference and was limited by a diffusion process. The as-developed Pt 3 /S 3 -g-C 3 N 4 /GCE sensor has good linearity in a wide range of 0.1–120 μmol/L and a remarkably low limit of detection (LOD) of 0.026 μmol/L for SMM determination. In addition, the sensor has high selectivity and anti-interference properties for SMM detection. Furthermore, this Pt 3 /S 3 -g-C 3 N 4 /GCE sensor has good reproducibility and stability. Moreover, the recoveries were in the range of 89.6–112.2% for the detection of the SMM in a real sample of egg. The proposed Pt 3 /S 3 -g-C 3 N 4 /GCE sensor shows great potential for practical applications in detecting trace amounts of antibiotics.
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CATALYSIS LETTERS
·
2021
·Vol. 151
·期 12
·3523-3531
·
IF 3.186
Bian Yuhang,Shan Qingwen,Guo Changchang,Liu Chaozheng,Zhang Juan
High biodiesel yield was obtained by using poly (acidic ionic liquid)s. The ionic liquid monomer was synthesized through quaternary ammonization on the N,N-Dimethyl-3-aminophenol with 1,3-propanesultone and p-Hydroxybenzenesulfonic acid. The IL monomer and formaldehyde was used to synthesize the poly(acidic ionic liquid)s. Several physicochemical techniques were used in the characterization of this poly(acidic ionic liquid)s. The esterification of oleic acid and methanol was used to investigate the catalytic activity of the synthesized catalyst. In order to obtain the maximum yield, four parameters (reaction time, amount of methanol, temperature and catalyst amount) were considered. In the optimum condition (5 wt% catalyst amount, 9:1 methanol/oleic acid ratio at 80 °C for 1.5 h), the ester yield was up to 93.3%. After four cycles of use, the catalytic activity of FCPIL did not exhibit significant decline. Graphic Abstract
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Ming Jin,Rui Gao,Guiru Sun,Haibo Li,Xiangxin Xue,Chaoqun Qu,Nan Li,Yuting Zhang,Zhao Wang,Ming Feng
Lithium sulfide (Li 2 S) compounds as cathode materials for Lithium-sulfur (Li-S) battery have attracted more and more attention recently because of its high specific capacity, lower volume expansion and higher thermal stability of Li 2 S. However, high electrochemical barrier of the Li 2 S cathode and “shuttle effect” from S species on anode still block the development of Li-S batteries. Herein, LiFePO 4 (LFP) is employed as dual-function separator modifier to establish hybrid cathode. The modified separator will reduce overpotential for effective and durable sulfur redox reactions at the same time, it can also efficiently immobilize the lithium polysulfides (LiPSs) through the Lewis acid-base interaction of LiPSs and LFP. The battery systems based on the as-developed LFP modified separator exhibit an excellent rate capability, high sulfur utilization and outstanding cycling performance. The capacity retention can reach 83.9% after 400 cycles at 0.2 C, and the capacity can reach 594 mAh g −1 at up to 2 C. Current facile and low-cost strategy to modified Li-S battery systems on one hand offers an effective pathway to enhance electrochemical performance, on the other hand inspire new strategies on reducing the activation barrier of Li 2 S for improved sulfur electrochemistry as well.
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Journal of Physical Chemistry C
·
2021
·
IF 4.126
Pengfei Yao,Jing Cao,Xue Gong,Ce Han,Mingbo Ruan,Ping Song,Weilin Xu
The development of catalysts free of platinum-group metals with a high performance for the oxygen reduction reaction (ORR) in proton exchange membrane fuel cells is a grand challenge. Herein, we report zeolitic imidazolate framework-8-based Co, N, and S tridoped carbon frameworks (Co–N–S CFs) with high ORR catalytic activity and remarkable durability in an alkaline medium. Results indicate that the high ORR performance of the Co–N–S CFs could be attributed to the unique 3D structure of carbon frames, the synergistic effect among Co, N, and S, and its high electron conductivity. It is also found that the N and S doped heteroatoms can anchor Co atoms by forming CoNx and CoSx active sites for a highly efficient ORR. The results obtained here can help in the design and understanding of the cost-effective highly active Pt-free electrocatalysts.
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Environmental Science-Nano
·
2021
·Vol. 8
·期 7
·2069-2080
·
IF 8.131
Xuan He,Lei Zhang,Xiangang Hu,Qixing Zhou
Solar steam generation has attracted interest in water purification and seawater desalination as an efficient solar energy conversion method. However, the complex preparation process and limited efficiency restrict the practical applications of solar-generated steam. Here, we report a three-dimensional wood membrane inside coated with MoS2 (WM-H, with S defects) for efficient seawater desalination. The vertically aligned mesoporous wood channels and their inner microstructures increase the contact interface between water and MoS2 in wood. The formation of S defects allows the surface temperature of the membrane to reach ∼53 °C under 1 sun illumination. The MoS2-coated wood with S defects exhibited an excellent evaporation flux (1.46 kg m−2 h−1, one sun), with a solar thermal conversion efficiency of 82.5%. The adsorption peak values of Na+ on the two sides of MoS2 with defects are 2.17 times and 1.49 times higher than those of MoS2 without defects. The wood-based design provides an inexpensive way to capture solar energy and generate steam.
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Nanoscale
·
2020
·Vol. 12
·期 25
·13507-13512
·
IF 6.895
Hongjing Wang,Songliang Liu,Hugang Zhang,Shuli Yin,You Xu,Xiaonian Li,Ziqiang Wang,Liang Wang
Electrochemical nitrogen reduction reaction (NRR) provides a facile and sustainable route to synthesize ammonia. The preparation of efficient and high-performance catalysts is one of the most important issues in large-scale applications of the electrochemical synthesis of ammonia. Herein, we have devised a simple method to fabricate three-dimensional palladium-silver-sulphur porous nanosponges (Pd–Ag–S PNSs) under room temperature. The porous network can provide more active sites and accessible channels for the reaction species. The incorporation of sulfur reduces the energy barrier of NRR and promotes the nitrogen hydrogenation to ammonia. Intrinsically, the Pd–Ag–S PNSs demonstrates a superior NRR performance with an NH3 yield of 9.73 μg h−1 mg−1cat. and a faradaic efficiency of 18.41% at −0.2 V, superior to those of the undoped Pd–Ag PNSs. The design of the three-dimensional metallic nanosponges with the doping of nonmetallic elements is a highly valuable strategy for NRR and other electrocatalytic reactions.
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