CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Yang Zhao,Yanli Gong,Chunming Gao,Zexiang Chen,Caijun Zheng,Huifang Lv,Hualiang Wei,Zhiyu Zhou,Yan Wang
Monofunctional host materials of lithium-sulfur (Li-S) batteries are inadequate to simultaneously address the complex issues including “shuttle effect” and sluggish redox kinetics. Herein, iron and manganese bimetallic phosphorus trisulfide (Fe-MnP 2 S 6 ) with heterointerfaces and a semi-open frame structure was synthesized as a multifunctional host material for Li-S batteries. Theoretical calculations suggest that due to the strong electronic coupling effect, electrons migrate from the MnPS 3 layer to the FePS 3 layer, accelerating charge and ion transfer on the surface of FePS 3 . The d-band center of metal atoms shifts towards the Fermi level through the introduction of Mn 2 P 2 S 6 , enhancing the interaction with polysulfides . Moreover, the frame exhibits excellent structural stability and physical limiting ability of sulfur. As a result, the cell with Fe-MnP 2 S 6 delivers impressive electrochemical performance and redox kinetics, including a capacity of 1388 mAh/g at 0.2C, a rate performance of 850 mAh/g at 4C and a capacity attenuation rate of 0.028 % per cycle over 1,000 cycles at 1C. Through meticulous structural design and optimal composition adjustments, our work explores the mechanism of metal phosphorus trisulfides (MPS 3 ) in Li-S batteries.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2023
·
IF 6.2
Wenbo Si,Jilu Yang,Yuping Cao,Wenwu Qin
The covalent organic frameworks (COFs) have emerged as potential photocatalysts for solar-driven hydrogen evolution , but the disadvantage that photogenerated electrons and holes are prone to recombination limits their applications. Here, a rGO/BP/TpPa-1 high-low heterojunction with electron acceptors was prepared by integrating reduced graphene oxide (rGO) and black phosphorus (BP) into COF TpPa-1 to reduce the recombination rate of photoinduced charge carriers. The photocatalytic hydrogen evolution rate reached 18.09 mmol h −1 g −1 , about 3.3 times higher than pure TpPa-1. Here, a two-step photogenerated electron transfer mechanism is proposed. Firstly, a high-low heterojunction is formed between TpPa-1 and BP through an internal electric field from BP to TpPa-1, facilitating photogenerated electrons transfer from TpPa-1 to BP, then rGO attached to the BP surface acts as an electron acceptor, further collecting photogenerated electrons for reaction. This work provides a novel strategy for synthetizing efficient COF-based photocatalysts.
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Nano Research
·
2023
·
IF 9.9
Chen Yan,Yang Zhenrui,Wang Juan,Yang Yun,He Xuedong,Wang Yang,Chen Jiadong,Guo Yaqing,Wang Xin,Wang Shun,Jin Huile
Enhancing catalytic activity through modulating the interaction between N-doped carbon and metal phosphides clusters is an effective approach. Herein, the electronic structure modulation of CoP 2 supported N-modified carbon (CoP 2 /NC) has been designed and prepared as efficient electrocatalysts for oxygen reduction reaction (ORR), oxygen evolution reaction (OER), and hydrogen evolution reaction (HER). Notably, CoP 2 /NC-1 catalyst exhibits impressive performance in alkaline media, with an ORR half-wave potential of 0.84 V, as well as OER and HER overpotentials of 290 and 129 mV (at 10 mA·cm −2 ), respectively. In addition, CoP 2 /NC-1 produces a power density as high as 172.9 mW·cm −2 , and excellent reversibility of 100 h at 20 mA·cm −2 in home-made Zn-air batteries. The experimental results demonstrate that the synergistic interactions between N modified carbon substrate and CoP 2 material significantly enhance the kinetics of ORR, OER, and HER. Density functional theory (DFT) calculations reveal the strong electrons redistribution of CoP 2 induced by high-density N atoms at the interface, thus optimizing the key intermediates and significantly lower the energy barrier of reactions. These electronic adjustments of CoP 2 greatly enhance its kinetics of ORR/OER/HER, leading to faster reactions. This study provides profound insights into the specific modification of CoP 2 by N-doped carbon, enabling the construction of efficient catalysts.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Yingying You,Haiguang Yuan,Yixiao Wu,Yiyang Ma,Chenchen Meng,Xuesong Zhao
Using solar energy to reduce bromate in drinking water is promising. Unfortunately, most effective photocatalysts for bromate conversion are metal-based semiconductors. Here, for the first time, metal-free hybrid composites made of red phosphorus and perylene diimide (RP/PDI) were successfully designed and constructed, and their excellent catalytic performance for removing bromate under visible light was demonstrated. Characterizations such as XRD, FTIR, Raman, SEM and XPS confirmed the successful preparation of the hybrid catalyst, and the impact of water matrices suggests that it can be used for the actual treatment of bromate. The bromate reduction rate of the prepared RP/PDI-2 was 4.2 times and 7.0 times faster than pure RP and PDI, respectively. As evidenced by EIS and EPR results, this improvement is mainly due to the formation of p-n heterojunctions , which enhanced the separation of charge carriers and inhibited the production of active species ( O 2 − and OH) with strong oxidative capabilities. Considered holistically, the current study provides not only a metal-free photocatalyst with good photoreduction performance, but also some guidance for the rational design of hybrid photocatalyst in the treatment of aqueous bromate.
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RSC Advances
·
2021
·Vol. 11
·期 20
·12153-12161
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IF 3.361
Li Huang,Ruchao Gao,Liuying Xiong,Perumal Devaraji,Wei Chen,Xiying Li,Liqun Mao
Two-dimensional (2D) semiconductor materials have attracted considerable attention in the field of photocatalysis due to the high interfacial charge separation efficiency and abundant surface active sites. Herein, we have fabricated 2D/2D sheets of Ni2P/CdS heterostructure for photocatalytic H2 evolution. The microscopic and photocatalytic activity results suggested that Ni2P nanosheets were coupled with snowflake CdS. The optimal hydrogen production rate reached 58.33 mmol h−1 g−1 (QE = 34.38%, λ = 420 nm) over 5 wt% Ni2P, which is equivalent to that of 1 wt% Pt/CdS. Compared with pure CdS, Ni2P/CdS presented lower fluorescence intensity and stronger photocurrent density, which demonstrated that the 2D/2D Ni2P/CdS heterojunction photocatalyst significantly improved the separation efficiency of photogenerated electrons and holes. The excellent performance of Ni2P/CdS clearly indicated that Ni2P was an excellent cocatalyst and could provide abundant active sites for hydrogen evolution.
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Inorganic Chemistry Frontiers
·
2021
·Vol. 8
·期 7
·1810-1818
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IF 6.569
Yabin Ma,Bin Quan,Zhihui Zeng,Yunke Zhang,Lan Zhang,Yu Wang,Xiaogu Huang
Strong electromagnetic (EM) response at low thickness is urgently required to address the emerging EM radiation pollution. Among numerous methods to achieve electromagnetic response at low thickness, interface construction exhibits some advantages for the combination of numerous dissipation mechanisms. Here, ternary Mo-Ni2P/rGO absorbers with multiple interfaces are designed via the phosphating treatment at a certain temperature. The constructed heterojunctions can efficiently exploit the high-conjunction of Ni2P and rGO and the interactions between different dielectric media (metal/semiconductor/conductor) for excellent electrical conductivity, abundant interfacial polarizations, and rational combination of different loss materials. As the phosphating temperature increases from 600 to 800 °C, the Mo-Ni2P/rGO-800 sample exhibits excellent microwave absorption performance, where the reflection loss (RL) value is −35.43 dB, and the effective bandwidth reaches 3.48 GHz at only 1.20 mm. This study proposes a simple method to enhance the microwave absorption performance at low thickness based on the construction of heterojunction structures. Moreover, an insight into the role of integrating different loss mechanisms in achieving high-efficiency EM wave absorbers has been fulfilled.
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Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 10
·6432-6441
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IF 12.732
Weiji Dai,Xiaowan Bai,Yin-an Zhu,Yue Zhang,Tao Lu,Ye Pan,Jinlan Wang
Surface reconstruction of non-oxide electrocatalysts for the oxygen evolution reaction (OER) to form “true” active species has been reported; however, the mechanism of the in situ surface activation has remained unclear. In this work, nanocrystalline Ni5P4 is prepared as a pre-catalyst for the OER to gain insight into the in situ surface activation. We find that NiO nanosheets with abundant crystal defects are formed on the surfaces of Ni5P4 particles during the electrochemical process. The effects of the in situ P incorporation in surface reconstruction derived NiO for OER electrocatalysis are discussed. Theoretical calculations reveal that the heteroatom P substitution for O atoms of NiO crystals on the subsurface can weaken the binding strength of the OER intermediates, change the potential-determining step of the OER and achieve a lower theoretical overpotential. The present work provides a novel mechanism of the enhanced electrocatalytic performances of non-oxide materials for OER electrocatalysis by highlighting the effects of surface reconstruction induced in situ heteroatom doping in derived active materials.
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ADVANCED MATERIALS
·
2021
·Vol. 34
·期 2
·2107206
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IF 30.849
Xingang Wang,Tao Xiong,Kai Zhao,Ziqi Zhou,Kaiyao Xin,Hui-Xiong Deng,Jun Kang,Juehan Yang,Yue-Yang Liu,Zhongming Wei
2D materials have been attracting high interest in recent years due to their low structural symmetry, excellent photoresponse, and high air stability. However, most 2D materials can only respond to specific light, which limits the development of wide-spectrum photodetectors. Proper bandgap and the regulation of Fermi level are the foundations for realizing electronic multichannel transition, which is an effective method to achieve a wide spectral response. Herein, a noble 2D material, palladium phosphide sulfide (PdPS), is designed and synthesized. The bandgap of PdPS is around 2.1 eV and the formation of S vacancies, interstitial Pd and P atoms promote the Fermi level very close to the conduction band. Therefore, the PdPS-based photodetector shows impressive wide spectral response from solar-blind ultraviolet to near-infrared based on the multichannel transition. It also exhibits superior optoelectrical properties with photoresponsivity ( R ) of 1 × 10 3 A W −1 and detectivity ( D* ) of 4 × 10 11 Jones at 532 nm. Moreover, PdPS exhibits good performance of polarization detection with dichroic ratio of ≈3.7 at 808 nm. Significantly, it achieves polarimetric imaging and hidden-target detection in complex environments through active detection.
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NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 42
·19876-19882
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IF 3.591
Ling Zhao,Hanping Fu,Lishan Jian,Yating Zeng,Liran Liu,Qingshuang Liang,Xiufeng Xiao
In this work, we report a novel phosphorus element heterostructure with a snowflake-like morphology consisting of 1D rod-like black phosphorus (BP) and 2D flake-like red phosphorus (RP). The content of black phosphorus in the heterostructure can be adjusted and the light absorption range and photocatalytic performance of the heterostructure increase with the proportion of black phosphorus. In this 1D/2D phosphorus element heterostructure, the photogenerated electrons in the conduction band of BP can be used for water decomposition to produce hydrogen, while the photogenerated holes in the valence band of RP can be used to produce oxygen, without using any sacrificial agents. The ratio of hydrogen and oxygen evolution rates is 2 : 1, and the rates are 2.0 and 1.1 μmol g−1 h−1, respectively. Therefore, we believe that this work demonstrates the potential of metal-free elemental photocatalysts with high efficiency, especially in overall pure-water splitting.
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Inorganic Chemistry Frontiers
·
2021
·Vol. 8
·期 23
·5034-5044
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IF 6.569
Yu Du,Gentian Yue,Zhang Lan,Yueyue Gao,Jihuai Wu,Furui Tan
Transition metal phosphates have aroused wide attention and been applied in the field of energy conversion due to their high catalytic properties and low cost, but magnetic metal phosphates are rarely used in DSSC. In this work, the magnetic CoP@FeP4 thin film was prepared on carbon paper (CP) using a two-step process and proposed as a counter electrode (CE) for dye-sensitized solar cells (DSSCs). The morphology of CoP@FeP4@CP with a silkworm-like structure is advantageous to enhance the catalytic ability for the interface reaction, establish a good connection between the electrode material and electrolyte, and accelerate the electron transmission. The characterizations using cyclic voltammetry, electrochemical impedance spectroscopy, and Tafel curves all indicate that the CoP@FeP4@CP CE shows excellent electrochemical catalytic performance for the I−/I3− electrolyte. Under optimal conditions, a high power conversion efficiency of 9.88% is achieved for DSSC with CoP@FeP4@CP CE much higher than that of Pt (7.49%) and CoP@CP (8.73%) CEs. This phenomenon can be attributed to the unique chemical structure and the synergistic effect of CoP@FeP4@CP CE. CoP@FeP4@CP CE with the advantages of efficient, low cost, and facile synthesis is a promising alternative to the expensive Pt CE for the DSSCs in the future.
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ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Xiaoyan Wang,Mingxing Hou,Zhenglu Shi,Xiang Liu,Isao Mizota,Hongtao Lou,Bin Wang,Xianhua Hou
Heteroatom-doped hard carbon is a popular method to optimize the electrochemical performance of anode electrodes for sodium-ion batteries. Herein, phosphorus-doped hollow carbon nanorods (P-HCNs) are obtained by a one-step synthesis with a high phosphorus content of 7.5 atom %. By controlling the P configuration, the P-HCNs03 exhibits reversible capacity as high as 260 mA h g–1 at the current density of 1.0 A g–1 after 500 cycles with an initial Coulombic efficiency (ICE) of 73%. When the amount of phosphorus in the as-prepared materials is changed, the different structures of the P-doped carbon lattices are analyzed by X-ray diffraction, Raman spectroscopy, and X-ray photoelectron spectroscopy. Based on the first-principles calculation, although the P–O bond has the most configurations, the excellent reversible capacity of the electrode is attributed to the strong Na-absorption ability of P═O and P–C bonds. The sodium-based dual-ion batteries (NDIBs) assembled with P-HCNs03 as an anode and expanded graphite as a cathode (P-HCNs03//EG) exhibited a high energy density of 138 W h kg–1 at a power density of 159 W kg–1. The results provide an important angle to optimize the performance of hard carbons with other functionalized heteroatoms.
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OPTICAL MATERIALS
·
2021
·
IF 3.08
Gengcheng Liao,Hui Qiao,Zongyu Huang,Siwei Luo,Yuan Ji,Yundan Liu,Xiang Qi
Designing a Z-scheme heterojunction is of great significance to achieve high separation of photogenerated carriers and strong photo-redox properties of two semiconductor materials . In photosynthesis, the effects of photocatalytic electrolytes (adenosine triphosphate (ATP) and nicotinamide adenine dinucleotide phosphate (NADPH)) on chemical energy has attracted numerous interests. In this case, developing photocatalytic electrolytes with more active site and efficient charge extraction and separation would be beneficial for superior photocatalytic activity in Z-scheme system. Herein, we synthesized a Black/Red (BP/RP) phosphorus Z-scheme hybrid via a feasible two-steps sonochemical method, and the adding photocatalytic electrolytes ATP and NADPH in KOH solution endow the system with new vitality in photocatalysis . Consequently, photoelectrochemical (PEC) tests demonstrated the as-prepared BP/RP Z-scheme hybrid exhibits enhanced photocurrent of 9 μA/cm 2 at 0.5 V compared to the sole RP, while adding NADPH and ATP, the photocurrent of BP/RP Z-scheme hybrid shows dramatic increment of 30 μA cm −2 at a bias potential of 0.6 V. The improved photocatalytic activity is ascribed to the abundant active sites, higher carrier mobility of the BP/RP Z-scheme system, as well as the efficient photogenerated carrier separation and the prolonged lifetime of photocatalytic electrolytes. This work demonstrated the photocatalytic electrolytes can meet the unity of coordination and efficiency of achieving efficient PEC catalytic in the Z-Scheme system, and provides positive ideas for the possibility and superiority for other 2D materials in the field of ultrafast Photonics , photodetectors , etc.
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