ENERGY & FUELS
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2022
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IF 4.654
Baoshu Li,Jiping Li,Xixue Liu,Jinxue Guo,Yanfang Sun,Xiao Zhang
Exploring highly active catalysts with low-price materials is urgently needed for water-splitting electrolysis. Herein, selenium-doped CoP nanoneedles construct the grass-like structure, and the nanoneedles are vertically anchored on carbon cloth (Se–CoP/CC). Scanning electron microscopy and transmission electron microscopy reveal the nanoneedle array architecture of S–CoP, which is convenient for the adsorption of molecules on active centers. The small diameter of nanoneedles is beneficial for rapid charge transfer. X-ray photoelectron spectroscopy shows the electronic structure regulation of Se incorporation, which is beneficial for the optimized catalysis activity. Electrochemical tests show that Se dopants result in more catalysis sites and faster kinetics. Endowed with these advantages, good catalytic performance of the prepared sample for hydrogen evolution is disclosed, with low overpotentials of 47 mV at 10 mA cm–2 and 145 mV at 100 mA cm–2 in alkaline solution. This work highlights a promising way to improve the performance of transition-metal-based catalysts with non-metal-doping engineering toward water electrolysis application.
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JOURNAL OF LUMINESCENCE
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2022
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IF 4.171
Dong Li,Xiaoxiao He,Litao Zhao,Haoyang Li,Yu Zhao,Sanjun Zhang,Xiaolei Zhang,Jinquan Chen,Qingyuan Jin,Jianhua Xu
In this article, by connecting positively charged cysteamine-coated ZnSe quantum dots (QDs) with either negatively charged graphene oxide (GO) or reduced graphene oxide (RGO), we have assembled ZnSe-GO and ZnSe-RGO composite materials, respectively. We used time-correlated single photon counting (TCSPC) and femtosecond transient absorption (TA) to study the effects of GO/RGO on the fluorescence and carrier transport dynamics of ZnSe QDs. We confirmed that the strong excited state interaction between GO/RGO and ZnSe QDs could significantly quench the exciton fluorescence of ZnSe QDs. Picosecond ultrafast electron transfer from ZnSe QDs to GO/RGO surfaces has been found, and it can decrease the bleaching signal intensity of ZnSe QDs and accelerate the recovery of the bleaching signal as well. Moreover, we found that the energy level change caused by the GO reduction reduced the energy level difference between RGO and ZnSe QDs, which implies broader application prospects for ZnSe-RGO vs. ZnSe-GO composite.
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JOURNAL OF POWER SOURCES
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2022
·
IF 9.794
Xirui Kong,Yichen Kong,Lang He,Wenna Zhang,Yi Song,Sheng Liu,Yan Zhao
A new ether-based electrolyte with tetrahydrofuran (THF) and di-isopropyl ether (DIPE) is proposed for Lithium–Sulfur battery (LSB). By employing the common ion effect and the weakly-solvating solvent (such as DIPE), the dissolution of lithium polysulfides and the self-discharge effect are effectively inhibited. Besides, the LiFSI has be used as the co-salt in the LiTFSI-based electrolyte to improve the ionic conductivity and inhibit the side reaction on Li metal anode . It is worth mentioning that, the L1L2TD-1382 electrolyte (LiTFSI: LiFSI: THF: DIPE = 1 : 3: 8 : 2, molar ratio) ensures a stable cycling for more than 500 cycles with a high Columbic efficiency (CE) of Li deposition/stripping (>99.3%). Impressively, with selenium doped sulfurized polyacrylonitrile (SeSPAN) cathode, the Li–S cell has delivered a high capacity of 626 mAh g −1 in 500th cycle with an excellent capacity retention no less than 93%. This work provides a new insight to electrolyte design strategy of advanced electrolytes for Li–S batteries .
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ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Shuyan Shao,Tao Wen,Ziqun Wang,Xiaoshuang Yin,Ying Liu,Wenzhong Yang,Yun Chen
Electrocatalytic reduction of CO 2 to formate is an extremely attractive route. Here, we developed a SnSe 2 -graphene composite catalyst, and SnSe 2 nanosheets were linked to graphene by Sn-O-C bonds to form complicated hierarchical nanosheet structure. Due to the intrinsic activity of SnSe 2 and the modification of graphene, the catalyst performed excellent electrocatalytic efficacy for the reduction of CO 2 to formate, with a maximum Faraday efficiency up to 95.1% at -0.9 V (vs. RHE) and a current density of 11.8 mA cm −2 under the optimal conditions. Kinetic experiments indicated that the SnSe 2 -graphene composite achieved efficient formate selectivity for CO 2 reduction by increasing the initial transfer rate of electrons to the CO 2 molecule.
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JOURNAL OF LUMINESCENCE
·
2022
·
IF 4.171
Jinke Bai,Tianyi Hou,Meilun Zhang,Peilin Ou,Xiao Jin,Qinghua Li,Zisheng Su,Zeqiang Chen,Yuxiao Wang,Xueru Zhang,Yinglin Song
Environmentally friendly zinc selenide (ZnSe) based core/shell quantum dots (QDs) are promising emitting materials for special light sources and displays. However, ZnSe-based core/shell QDs with violet-blue emission that simultaneously possess thick shells and narrow emission linewidths are still challenging thus far. We herein use a gradient ZnSe x S 1-x /ZnS shell strategy to target this goal. The ZnSe x S 1-x mid shell helps the lattice strain relaxation during the growth, whereas the wide bandgap ZnS outer shell benefits the optical properties by passivating the emitting cores and improving the quantum confinement effect. These ZnSe core QDs show a unity zinc blende structure and high crystallinity . The optimized ZnSe/ZnSe x S 1-x /ZnS QDs exhibit tunable emission wavelengths (415–445 nm), narrow photoluminescence linewidths (10.2–14.2 nm), thick shells (>3.9 nm), and high photoluminescence quantum yields (>50%). We postulate that these excellent features are due to the use of alloyed ZnSe x S 1-x layer at the core/shell interfaces. This study provides a feasible idea for the development of blue ZnSe-based QDs with perfect emitting properties.
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Small
·
2022
·Vol. 18
·期 52
·2205017
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IF 15.153
Xirui Kong,Yichen Kong,Yayun Zheng,Lang He,Du Wang,Yan Zhao
With a high energy density, lithium–sulfur batteries (LSB) are regarded as one of the promising next-generation energy storage systems. However, many challenges hinder the practical applications of LSB, such as the dendrite formations/parasitic reactions on the Li metal anode and the “shuttle effect” of lithium polysulfides of the LSB cathode. Herein, a novel diluted medium-concentrated electrolyte (DMCE) is developed by adding 1,1,2,2-tetrafluoroethyl 2,2,3,3-tetrafluoropropyl ether (TTE) into a dual salt medium-concentrated electrolyte (MCE) consisting of lithium bis(trifluoromethanesulfonyl)imide (LiTFSI)–lithium bis(fluorosulfonyl)imide (LiFSI)/tetrahydrofuran (THF)–dipropyl ether (DPE). The optimized DMCE electrolyte is capable of protecting the Li metal anode and suppresses the dissolution of polysulfides and the “shuttle effect”, delivering a high coulombic efficiency (CE) of Li plating–stripping up to 99.6% even at a low concentration of Li salt (1.0–2.0 m ). Impressively, compared with the cells cycled in the MCE electrolyte, the Li S cells with the DMCE-2.0 m electrolyte have delivered an enhanced initial capacity of 682 mAh g −1 with an excellent capacity retention of 92% for 500 cycles. This strategy of using fluorinated ether as diluent solvent in a medium-concentrated electrolyte can accelerate the commercialization of LSB.
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PubMed
高影响因子
Advanced Science
·
2022
·Vol. 9
·期 35
·2203782
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IF 17.521
Bangzhi Ge,Hyungseok Lee,Lulu Huang,Chongjian Zhou,Zhilei Wei,Bowen Cai,Sung-Pyo Cho,Jing-Feng Li,Guanjun Qiao,Xiaoying Qin,Zhongqi Shi,In Chung
Realizing high average thermoelectric figure of merit (ZT ave ) and power factor (PF ave ) has been the utmost task in thermoelectrics. Here the new strategy to independently improve constituent factors in ZT is reported, giving exceptionally high ZT ave and PF ave in n-type PbSe. The nonstoichiometric, alloyed composition and resulting defect structures in new Pb 1+ x Se 0.8 Te 0.2 ( x = 0–0.125) system is key to this achievement. First, incorporating excess Pb unusually increases carrier mobility ( µ H ) and concentration ( n H ) simultaneously in contrast to the general physics rule, thereby raising electrical conductivity ( σ ). Second, modifying charge scattering mechanism by the authors’ synthesis process boosts a magnitude of Seebeck coefficient ( S ) above theoretical expectations. Detouring the innate inverse proportionality between n H and µ H ; and σ and S enables independent control over them and change the typical trend of PF to temperature, giving remarkably high PF ave ≈20 µW cm −1 K −2 from 300 to 823 K. The dual incorporation of Te and excess Pb generates unusual antisite Pb at the anionic site and displaced Pb from the ideal position, consequently suppressing lattice thermal conductivity. The best composition exhibits a ZT ave of ≈1.2 from 400 to 823 K, one of the highest reported for all n-type PbQ (Q = chalcogens) materials.
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高影响因子
Nature Communications
·
2022
·Vol. 13
·期 1
·1-13
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IF 17.694
Jiang Minxia,Hu Yingjie,Mao Baoguang,Wang Yixin,Yang Zhen,Meng Tao,Wang Xin,Cao Minhua
Manipulating the reversible redox chemistry of transition metal dichalcogenides for energy storage often faces great challenges as it is difficult to regulate the discharged products directly. Herein we report that tensile-strained MoSe 2 (TS-MoSe 2 ) can act as a host to transfer its strain to corresponding discharged product Mo, thus contributing to the regulation of Gibbs free energy change (Δ G ) and enabling a reversible sodium storage mechanism. The inherited strain results in lattice distortion of Mo, which adjusts the d-band center upshifted closer to the Fermi level to enhance the adsorbability of Na 2 Se, thereby leading to a decreased Δ G of the redox chemistry between Mo/Na 2 Se and MoSe 2 . Ex situ and in situ experiments revealed that, unlike the unstrained MoSe 2 , TS-MoSe 2 shows a highly reversible sodium storage, along with an evidently improved reaction kinetics. This work sheds light on the study on electrochemical energy storage mechanism of other electrode materials.
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高影响因子
IONICS
·
2022
·Vol. 29
·期 1
·313-322
·
IF 2.961
Xu Xiaoxuan,Li Chen,Li Na,Zhong Jiajin,Wang Xing,Fang Zheng,Bao Haifeng
Nickel-based selenides have attracted widespread attention as promising electrocatalysts for water splitting. This work proposes a novel and facile method to fabricate an efficient electrocatalyst based on morphological controlled nickel diselenide nanoparticles using L-cysteine (NiSe 2 -L) via atmospheric pressure hydrothermal. The NiSe 2 -L was prepared inside a round-bottom flask under stirring conditions in an oil bath at 100 ℃ for 4 h. This method no longer required posttreatment, just used L-cysteine for morphological control, and the reaction time was shortened to only 4 h. As expected, the NiSe 2 -L electrode exhibited good catalytic performance towards oxygen evolution reaction (OER) with an overpotential of 398 mV at the current density of 100 mA cm −2 and maintained a Faraday efficiency of up to 99% in 1 M KOH. Moreover, this electrode showed long-term stability with small overpotential increases (~ 16 mV) at 100 mA cm −2 after 5000 cycles of CV scans. Therefore, this work provided a facile synthesis method of nickel-based selenides with potential use value for OER in alkaline solutions.
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ACS Applied Electronic Materials
·
2022
·
IF 4.494
Jing Li,Yinlu Gao,Xinglai Zhang,Lixin Chen,Yonghui Ma,Liu Yang,Qing Liu,Xue Jiang,Baodan Liu
The phase transformation threshold and mechanism of layered GaTe1–xSex crystals have been controversial for a long time. Herein, we demonstrate that an extremely low Se content of 20% can induce the phase transformation of GaTe1–xSex from monoclinic structure to hexagonal structure. Theoretical and experimental studies reveal that the introducing of Se dopants effectively stabilizes the host lattice of metastable h-GaTe and thus induces the transformation of GaTe1–xSex from monoclinic to hexagonal lattice in the low Se doping range. The obtained GaTe1–xSex crystals also display tunable band gaps from 1.65 to 1. 85 eV and near band edge emission from 755 to 675 nm with increasing Se content from x = 0 to x = 0.44. More importantly, in comparison with GaTe and GaSe, layered GaTe1–xSex nanosheets exhibit p-type conductivity, higher carrier concentration, excellent photoresponse, and air stability. The fabricated GaTe1–xSex nanosheet photodetectors also show outstanding performance in the UV and visible range including a high responsivity of 91.3 A/W, an excellent EQE of 3.16 × 104%, and a specific detectivity of 5.05 × 109 Jones.
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JOURNAL OF MOLECULAR STRUCTURE
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2022
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IF 3.841
Guangjian Xing,Lei Zhang,Yan Zhao,Sai Li,Tian Li,Tiantian Lv,Chunna Yu,Chang Zhao
The visible-light-responsive photocatalysts with high efficiency have been attracting tremendous focus in environmental remediation. Herein, three-dimensional (3D) Sb 2 X 3 ( X = S , Se) nanowires/graphene aerogel (Sb 2 X 3 /GA) monoliths were prepared by a facile hydrothermal route. The as-prepared Sb 2 X 3 /GA monoliths show the shape of a cylinder with a hierarchical porous structure. FESEM and porosimetry analyses revealed that the monoliths have high porosity, large total pore area as well as large pore volume . Sb 2 X 3 /GA demonstrated excellent photodegradation performance for the representative anionic/cationic dyes (methyl orange, rhodamine B , and crystal violet) and antibiotic drug (tetracycline hydrochloride) under 120 min of visible light irradiation. The degradation efficiencies of Sb 2 X 3 /GA were found to be 92.6–99.8% for the above-mentioned dye/drug, which were much larger than that of the pristine Sb 2 X 3 nanowires . The enhanced photodegradation activity could be ascribed to the synergistic effect between the Sb 2 X 3 nanowires and graphene aerogel, which was confirmed by the results of the photoluminescence and electrochemical impedance spectra. These findings provide an innovative strategy for designing 3D visible-light-responsive photocatalysts for water purification .
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Nanoscale
·
2022
·Vol. 15
·期 1
·237-247
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IF 8.307
Panli Han,Lianxue Zhang,Yaqi Fu,Youyu Fu,Jianxiang Huang,Jinlin He,Peihong Ni,Taimoor Khan,Yang Jiao,Zaixing Yang,Ruhong Zhou
The selective anti-tumor activity and less toxic nature of hypoxia-activated prodrugs including tirapazamine (TPZ) are harbored by hypoxia levels in tumors, the inadequacy of which leads to failure in clinical trials. Thus, the development of effective clinical applications of TPZ requires advanced strategies to intensify hypoxia levels in tumors effectively and safely. In this study, we designed and fabricated a paclitaxel (PTX)-loaded dual-response delivery system with a low dose (e.g., 2 Gy) of X-ray and reactive oxygen species on the basis of diselenide block copolymers. Upon the external X-ray stimulus, the system accurately released encapsulated PTX at tumor sites and remarkably improved tumor hypoxia levels by causing severe damage to tumor blood vessels. Subsequently, these enhanced tumor hypoxia levels effectively activated the reduction of TPZ into benzotriazinyl free radicals, which significantly improved the antitumor efficacy of our system against 4T1 breast cancer cells with an initial tumor volume of 500 mm3. Moreover, the dual-stimulus coordinated and controlled release of PTX was found to largely avoid the off-target effects of PTX on normal cells while exhibiting very limited side effects in experimental mice. The current novel strategy for regulating tumor hypoxia levels offers an effective and safe way to activate TPZ for the treatment of large solid tumors.
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