ACS Applied Nano Materials
·
2021
·
IF 5.097
Zili Ma,Ziying Wen,Cuiping Gu,Yanjun Yin
Achieving ideal photoelectrochemical (PEC) water splitting efficiency for renewable chemical fuel generation is a highly preferable but a challenging target. To do so, much effort needs to be taken to investigate photoelectrodes. In this study, we report the amelioration of hematite (α-Fe2O3), which is a well-known semiconducting oxide suitable for PEC water oxidation. The Se-doped α-Fe2O3 nanowire array thin film on the fluorine-doped tin oxide substrate was synthesized by a facile one-step hydrothermal process followed by in situ two-step annealing at 823 and 1073 K. A photocurrent of 0.85 mA cm–2 at 1.23 V versus RHE was achieved for the Se-doped α-Fe2O3 photoanode, which was more augmented than the undoped α-Fe2O3 photoanode (0.33 mA cm–2). The Mott–Schottky plot revealed that the carrier concentration of α-Fe2O3 was strongly increased through Se doping. Photovoltage and electrochemical impedance spectroscopy indicated that Se-doped α-Fe2O3 exhibited a stronger driving force and reduced charge transport resistance, which were crucial aspects for higher photocurrent. Our work highlights the importance of the nonmetal element dopant to improve the PEC performance of α-Fe2O3 via convenient preparation.
研究领域:
材料科学
·
能源科学
·
纳米技术
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Yi Wang,Yuxin Wang,Yueting Wang,Jin Zhao,Yang Gao,Jingyi Liang,Tianjun Hu,Baoliang Lv,Ergui Luo,Jianfeng Jia
Carbon-based metal-free materials are emerging as leading candidates to replace noble-metal catalysts in the oxygen reduction reaction (ORR). Herein, we introduce a facile secondary carbonation technique for fabricating Se and N co-doped metal-free catalysts using a zeolite imidazole framework (ZIF-8) as the precursor. The optimal electrocatalyst, designated SeNC-900, exhibited good ORR performance under both alkaline and acidic conditions, with half-wave potentials of 0.864 V and 0.731 V (vs. RHE), respectively. Density functional theory (DFT) calculations reveal that the enhanced activity of SeNC-900 originates from Se doping, which triggers an increase in the intrinsic defects of sp 3 -hybridized C. Concurrently, the sp 3 -hybridized C, in concert with Se dopant, modulates the electronic structure of the active C atoms. This work not only underscores the significance of tuning the electronic structure to boost catalytic performance by enriching intrinsic defects but also presents a fresh insight into the effect of heteroatom doping on carbon-based materials for electrocatalysis.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Luyao Qi,Shengfan Fang,Huipei Zhang,Mengyuan Guo,Yanmin Qin,Liping Guo
Molybdenum disulfide (MoS 2 ) is considered a promising candidate for anodes in lithium-ion batteries (LIBs), however, its practical application is hindered by inferior cyclic stability and poor capability. Given the analogous coordination environments of selenium and sulfur within the same main group, selenium doping (Se) is explored to augment interlayer spacing and conductivity, thereby accelerating diffusion kinetics and enhancing capacitance contribution. In this study, we fabricate composites of Se-doped bulk MoS 2 (B-MoS 2 -Se) through a combination of heat treatment and subsequent selenization process. Se doping not only enhances interlayer spacing but also forms a binary alloy , MoS 2−x Se x . The expanded interlayer spacing mitigates resistance to Li + diffusion, improving the kinetics of Li + reactions, while the binary alloy MoS 2−x Se x concurrently enhances the conductivity of bulk MoS 2 . By intricately integrating these advantages, the B-MoS 2 -Se-1 electrode demonstrates exceptional long-term cycling performance (390 mA h g −1 at 1.0 A g −1 after 2000 cycles) and remarkable rate capability (172.4 mA h g −1 at 5.0 A g −1 ), showcasing its significant potential for practical applications in LIBs.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Yaoxia Yang,Xuqin An,Dangxia Wang,Fengyao Guo,Lan Zhang,Xingwei Guo,Dongfei Sun,Xiaozhong Zhou,Zhiwang Yang,Ziqiang Lei
Transition metal phosphide has recently become a research hotspot of electrocatalysis because of its low price and excellent performance. Furthermore, nonmetal heteroatom incorporation into materials is a good way to regulate the surface electronic structure of electrocatalysts to boost their electrocatalytic performance. Based on this, the molybdenum phosphide (MoP) nanoparticles were firstly anchored on nitrogen-doped the porous carbon (NC) substrate by a simple annealing process, and then doped with nonmetal heteroatom selenium (Se) by hydrothermal method . By adjusting the content of selenium, x Se-doped MoP/NC nanoparticle electrocatalysts were successfully synthesized. Among them, the 0.25 Se-MoP/NC electrocatalyst exhibited the best HER catalytic performance, which presented a low overpotential of 141 and 166 mV at 10 mA cm −2 in a 1.0 M KOH and 0.5 M H 2 SO 4 and Tafel slope of 69.91 and 62.93 mV dec −1 for HER, respectively. Benefiting from the doping of selenium, the electronic structure and surface composition of MoP can be effectively regulated, which is conducive to expose abundant active sites and enhance the inherent activity of MoP. Additionally, the N-doped porous carbon substrate also facilitates the diffusion of electrolyte/bubbles and good charge/mass-transfer ability. Furthermore, the electrocatalyst had good stability both in an acidic and alkaline media. This work provides an idea for the synthesis of nonmetal doped-transition metal phosphide as HER electrocatalyst with high efficiency and stability.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2024
·Vol. 20
·期 38
·2402466
·
IF 13
Yibin Ren,Jianbo Li,Yi Zhang,Yunhui Huang,Zhen Li
Aqueous Zinc–sulfur (Zn–S) batteries are promising for the field of energy storage due to their low cost, high theoretical capacity, and safety. However, the large volume expansion and the inherently poor conductivity of sulfur would result in electrode cracking and sluggish reaction kinetics, limiting the practical application of Zn–S batteries. Herein, commercial zinc sulfide (ZnS) is employed instead of S as cathode and proposed a doping modification strategy to solve the above problems. The designed ZnS 0.93 Se 0.07 cathode shows good cycle stability and much-improved reaction kinetics, which is due to the smaller bandgap of ZnS 0.93 Se 0.07 (1.40 eV) compared to ZnS (1.86 eV). As a result, the obtained ZnS 0.93 Se 0.07 cathode exhibits a high specific capacity of 552 mAh g −1 (1672.6 mAh g −1 based on S) at 0.1 A g −1 and 330 mAh g −1 (1000 mAh g −1 based on S) at 2 A g −1 . Moreover, the ZnS 0.93 Se 0.07 cathode can provide a high areal capacity of 3.8 mAh cm −2 at a high mass loading of 10 mg cm −2 and limited electrolyte (4 µL mg −1 ). This work provides a simple and effective cathode modification strategy, which is conducive to promoting the practical application of Zn–S batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Xiangju Chen,Yang Hong,Xiaoli Ge,Caixia Li,Xianguang Miao,Peng Wang,Zhiwei Zhang,Longwei Yin
Taking advantage of nano-sized active materials, doping and self-supporting, Se-doped Bi 2 S 3 /3D carbon foam (Bi 2 S 3-x Se x /CF) is synthesized through a pyrolysing-hydrothermal-heating three-steps process. The as-synthesized Bi 2 S 3-x Se x /CF hybrid exhibits a significant improvement in electrochemical performance, showing a high specific capacity of 441.8 mAh g −1 after 100 cycles with the coulombic efficiency approximating to 100%. The special nanoneedle-like structure of Bi 2 S 3 makes for shortening ion transmission distance, minishing the mechanical stress and thus improving the electrochemical performance. And the introduction of Se can enhance the specific capacity, cycling stability and rate performance by improving of electronic conductivity and forming Se-contained inactive phase during alloying process. Furthermore, the self-supporting electrode is beneficial to simplify preparation process and reduce the loss of volume energy density . The strategy presented in this paper to improve the electrochemical performance of secondary ions battery can be also applied to other novel electrodes materials.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Henglong Ren,Hao Guo,Yanrui Hao,Yu Liu,Liping Peng,Wu Yang
Transition metal sulfides (TMSs) have significant potential in energy storage applications due to their high theoretical capacity and diverse reaction mechanisms. However, performance limitations in supercapacitors arise from various intrinsic defects, including low active material utilization and poor cycling stability caused by unstable electrical conductivity. To address these issues, this paper incorporates selenium atoms into sulfides, aiming to leverage selenium’s high conductivity to enhance the electroactivity of transition metal sulfides. This approach improves both the conductivity of sulfides and the ion transport rate as well as enhances structural stability. Furthermore, a hierarchically porous structure of metal–organic framework (MOF) is synergistically optimized to augment the composite’s energy storage capacity. The resulting MnS@NiCoSeS-1 composite demonstrates excellent electrochemical performance, achieving a specific capacity of 901.0 C g −1 at 1 A g −1 in a three-electrode configuration, with a capacity retention of 82.6 % after 10,000 cycles at 3 A g −1 . Additionally, the hybrid supercapacitor (HSC) constructed from this composite exhibits a high specific energy of 78.85 Wh kg −1 at a power density of 775.2 W kg −1 . These findings validate the effectiveness of co-doping strategies for optimizing active material utilization and provide novel insights into the design of supercapacitors with both high energy and power densities.
研究领域:
材料科学
·
能源存储
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Zia Ur Rehman,Muhammad Bilal,Faheem K. Butt,Sajid Ur Rehman,Zeeshan Asghar,Kewang Zheng,Yongcai Zhang,Xiaoyong Xu,Jianhua Hou,Xiaozhi Wang
Graphitic carbon nitride is a promising photocatalyst to address environmental issues and energy applications. Herein, we develop an efficient defect-containing functionalized system of 2D selenium doped g-C 3 N 4 porous nanosheets via one pot with two-step temperature for the first time. During heat treatment, Se-infused g-C 3 N 4 nanosheets loosen stacking and form thinner nanosheets , which could effectively shorten the electronic path of charge migration. The introduction of nitrogen vacancies creates a midgap energy state below the CB, which improves the light-harvesting efficiency. Moreover, the dual effect of N vacancy and Se doping provides a driving force for the dissociation of excitons and achieves an effective spatial charge separation. High specific surface area (104.1 m 2 /g), suitable bandgap (2.65 eV), and good photocurrent response (0.45 µA cm −2 ) help to enhance the photocatalytic efficiency of 1-SeCN remarkably. Henceforth, high photocatalytic H 2 production rate of 5441 µmol g −1 h −1 and CO evolution rate of 31.5 µmol g −1 h −1 verifies the effective Se doping enhances the photocatalytic efficiency of g-C 3 N 4 . Furthermore, DFT calculations are consistent with experimental results and this facile engineering strategy provides a scalable way to develop a novel, efficient g-C 3 N 4 -based photocatalyst for H 2 production and CO 2 reduction.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Chemistry
·
2023
·
IF 13.1
Rong Zou,Wenwu Liu,Fen Ran
Sulfur-containing polymer (SCP) is considered as an outstanding cathode material for lithium-sulfur batteries. However, undesirable soluble polysulfides may shuttle in electrolyte, concluding long-chain Li 2 S n ( n > 4) and short-chain Li 2 S n ( n ≤ 4), as well as the sluggish conversion kinetics are yet to be solved to enhance the performance of lithium-sulfur batteries. Here Se-doped sulfurized polyaniline with adjusted sulfur-chain −S x − ( x ≤ 6) contribute to ensure the absence of long-chain polysulfides, and the skeleton with quinoid imine can endow strongly adsorption towards short-chain polysulfides by the reversible transition between deprotonated/protonated imine ( - N H + = and - N = ), which offer double insurance against suppressing “shuttle effect”. Furthermore, Se atoms are doped into sulfurized polysulfides to accelerate the redox conversion and take a frontier orbital theory-oriented view into catalytic mechanism. Se-doped sulfurized polyaniline as active materials for lithium-organosulfur batteries delivers good electrochemical performance, including high rate, reversible specific capacity (680 mA h g −1 at 0.1 A g −1 ), and lower capacity decay rate only of 0.15% with near 100% coulomb efficiency during long-term cycle. This work provides a valuable guiding ideology and promising solution for the chemistry-oriented structure design and practical application for lithium-organosulfur batteries.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Ling Li,Zhiqiang Wei,Weizhe Liu,Meijie Ding,Zhiming Li
Reasonable construction of multi-pore heterogeneous structures and enhancement of synergistic interaction between metal ions are important means to improve the performance of supercapacitors . This work selected metal organic frameworks (MOF) as the sacrificial template, and Se-doped needle-like nanosphere heterostructures Se-CoSe 2 @ZnSe were successfully prepared by in situ growth and selenization treatment. The specific capacity of the Se-CoSe 2 @ZnSe-5 (CZS-5) electrode is up to 2469.12 F g −1 at 1 A g −1 , and the capacity retention rate of 3000 cycles at a current density of 10 A g −1 is 85.39 %. The CZS-5//AC hybrid supercapacitor has a high power density of 1280.00 W kg −1 at an energy density of 68.88 Wh kg −1 . The excellent electrochemical properties are attributed to the construction of Se-CoSe 2 @ZnSe heterostructure of needle-shaped nanospheres enhances the synergy between Zn and Co ions; the doping of selenium effectively improves the conductivity of the electrode material; selenium vacancies produced during selenization increase the activity of the active site. In addition, the density functional theory (DFT) calculation shows that Se-CoSe 2 @ZnSe-5 has higher density of states (DOS) near the Fermi energy level, which provides additional theoretical support for the improvement of electrochemical performance.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Chemical Science
·
2021
·Vol. 12
·期 18
·6342-6349
·
IF 9.825
Xin Huang,Jinliang Song,Manli Hua,Bingfeng Chen,Zhenbing Xie,Huizhen Liu,Zhanrong Zhang,Qinglei Meng,Buxing Han
Selective oxidation of biomass-derived furan compounds to maleic acid (MA), an important bulk chemical, is a very attractive strategy for biomass transformation. However, achieving a high MA selectivity remains a great challenge. Herein, we for the first time successfully designed and fabricated Se-doped graphitic carbon nitride nanotubes with a chemical formula of C3.0N-Se0.03. The prepared C3.0N-Se0.03 was highly efficient for electrocatalytic oxidation of various biomass-derived furan compounds to generate MA. At ambient conditions, the MA yield could reach 84.2% from the electro-oxidation of furfural. Notably, the substituents on the furan ring significantly affected the selectivity to MA, following the order: carboxyl group > aldehyde group > hydroxyl group. Detailed investigation revealed that Se doping could tune the chemical structure of the materials (e.g., C3.0N-Se0.03 and g-C3N4), thus resulting in the change in catalytic mechanism. The excellent performance of C3.0N-Se0.03 originated from the suitable amount of graphitic N and its better electrochemical properties, which significantly boosted the oxidation pathway to MA. This work provides a robust and selective metal-free electrocatalyst for the sustainable synthesis of MA from oxidation of biomass-derived furan compounds.
研究领域:
化学工程
·
材料科学
·
可再生资源转化
✓ 已验证
DOI
高影响因子
Biomaterials Advances
·
2025
·
IF 6
Xingjian Yan,Han Dong,Liyin Gao,Mengqi Liu,Chunxi Wang
Prostate cancer (PCa) is commonly considered a “cold tumor” due to its immunosuppressive microenvironment. Cold tumors are typically identified by the absence of T-cell infiltration within the tumor, while other immune populations and myeloid cells can be observed in these tumors. To achieve light-heat combined immunotherapy checkpoint inhibitor treatment for castration-resistant prostate cancer, we aimed to transforming “cold tumors” into “hot tumors”. We designed and synthesized a two-dimensional material, selenium-doped black phosphorus (BP), to enhance the photothermal conversion efficiency, and formed Se@BPNSs by liquid-phase exfoliation. To address the issue of enhanced permeability and retention effect, and to achieve efficient targeting, we coated the Se@BPNSs with RM-1 cell membrane derived from mouse prostate cancer cells. By injecting a certain dose of Se@BPNSs into the tumor and irradiating with a 808 nm laser, the Se@BPNSs converted light energy into heat to kill tumor cells at high temperatures while releasing antigens captured by dendritic cells. In addition, we combined the immunotherapy checkpoint inhibitor anti-PD1 to enhance the immune response and promote immune cell infiltration. The successful preparation of Se@BPNSs was verified through material characterization, cell-level and animal-level experiments, and the antitumor effect was meanwhile verified, which further provided guidance for prostate cancer treatment by photothermal synergistic immunotherapy.
研究领域:
生物医学工程
·
肿瘤免疫学
·
纳米医学
✓ 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）