COMPOSITES COMMUNICATIONS
·
2021
·
IF 6.617
Chenqi Gao,Zhongshu Zhao,Xi Qin,Jing Teng,Jinchen Fan,Penghui Shi,Qunjie Xu,Yulin Min
Black phosphorus (BP) has attracted a lot of interest in the fields of oxygen evolution reaction (OER). Nevertheless, in terms of single use of BP as a catalyst, the inherent instability and poor conductivity of BP often limit further improvement of OER catalytic performance. Herein, we report a method using mechanical shear force to fully mix the carbon nanotubes (CNTs) and red phosphorus powder (RP) to obtain a hybrid dimensional (RP-BP/CNTs) heterostructured metal-free electrocatalyst with excellent OER performance in alkaline media. During the ball milling process, some RP is transformed into BP due to shear stress and high-temperature in-situ phase transformation. Meantime, a large number of defects in CNTs cut by ball milling combine with the lone pair of BP to form a P–C bond, resulting in a heterojunction structure. By rational interface engineering, the hybridisation of RP-BP and CNTs improves the electroconductivity and has excellent durability. The results demonstrate that RP-BP/CNTs heterostructure shows good OER performance with a low overpotential of 263 mV vs. RHE at a current density of 10 mA cm −2 , lower than that of commercial RuO 2 (310 mV vs. RHE, 10 mA cm −2 ). The small Tafel slope indicates that the catalyst has higher catalytic performance, while the stable structure ensures its long-term durability.
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高影响因子
SOLID STATE COMMUNICATIONS
·
2021
·
IF 1.804
Wenjia Liang,Lu Zhang,Xiaojun Xiang,Junpu Wang,Liu Zhang,Binbin Wu,Yipeng Wang,Yan Zeng,Shixue Guan,Qiqi Tang,Fang Peng
Single-crystal boron phosphide (BP), a high-temperature semiconductor, is prepared by a eutectic melting method. Large BP single crystals (>1 mm) are synthesized at high pressure and high temperature (5.0 GPa and 3000 °C). Their growth mechanism is analyzed. Ultraviolet–visible spectroscopy and thermogravimetry/differential thermal analysis show that BP is an indirect semiconductor (2.01 eV) and has excellent thermal stability (>1200 °C). Success in the synthesis of good BP crystals offers a huge opportunity to determine their intrinsic properties and will also stimulate more research on their performance as semiconductors.
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Advanced Energy Materials
·
2021
·Vol. 11
·期 8
·2003553
·
IF 29.368
Qiaoqiao Gui,Yutong Feng,Bingjie Chen,Feng Gu,Lu Chen,Shuo Meng,Mengzhu Xu,Mengting Xia,Chi Zhang,Jinhu Yang
The exploration of advanced electrode materials through rational structure/phase design is the key to develop high-performance rechargeable batteries. Herein, ternary metal phosphorus trisulfides (NiCoPS 3 ) with a bimetallic phase and an extrinsic structure of nanodots combined with nitrogen-doped graphitized carbon (NC) are developed for lithium-ion batteries. The designed NiCoPS 3 /NC holding a nanocube-like morphology shows a set of structural/compositional advantages as lithium-ion battery anodes including high electrical conductivity, low ion diffusion barrier, improved theoretical lithium storage capacity, and relieved lithiation stress, which are confirmed by characterizations and density functional theory calculations. As a consequence, the NiCoPS 3 /NC electrode displays superior comprehensive lithium storage performance, e.g., high reversible capacity (991 mAh g −1 at 0.1 A g −1 ), excellent cycling stability (up to 1200 cycles at 2 A g −1 and 2000 cycles at 5 A g −1 with respective capacity retention of over or nearly 100%), and good rate capability (58.4% capacity retention after a current change from 0.1 to 5 A g −1 ), representing the best comprehensive battery performance in MPS 3 -based anodes to date.
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ChemNanoMat
·
2021
·Vol. 7
·期 3
·277-283
·
IF 3.154
Jie Wang,Hongqin Ma,Jia Li,Xinyue Luo,Luqi Yu
Graphical Cu(I) decorated 2D black phosphorus nanosheets were synthesized by a ball-milling method . In the process of ball-milling, the bulk black phosphorus was exfoliated into nanosheets under the action of shearing force. Due to the reducibility of black phosphorus, it can react with CuCl 2 to form Cu(I)/BNPSs-n. As the active component of the adsorbent, Cu(I) species can interact with benzothiophene or dibenzothiophene in fuel to achieve the purpose of adsorption desulfurization. In this study, Cu(І) decorated two-dimensional black phosphorus nanosheets (BPNSs) adsorbents were prepared by a ball-milling method, and their adsorption-desorption performances were tested by batch adsorption experiments. The results showed that Cu(ІI) can be completely reduced to Cu(І) without adding any additional reducing agents during the ball-milling process, owing to the ability of black phosphorus to provide electrons to Cu(ІI). Moreover, the produced Cu(І) species were firmly anchored on BPNSs surface through chemical bonds formed between Cu and P atoms, effectively preventing them from aggregating. As the active sites on BPNSs surface, Cu(I) species can adsorb dibenzothiophene or benzothiophene from fuel by forming π-complexation bonds with them. The maximum adsorption capacity of the adsorbent for dibenzothiophene and benzothiophene were 13.16 and 18.02 mg S/g, respectively. Besides, the adsorption desulfurization activity can be recovered well by adopting simple thermal treatment.
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Nano Energy
·
2021
·
IF 17.881
Wei Xiao,Xifei Li,Bin Cao,Gang Huang,Chong Xie,Jian Qin,Huijuan Yang,Jingjing Wang,Xueliang Sun
The development of stable and durable phosphorus anodes for potassium-ion batteries (PIBs) has been retarded by a sluggish reaction kinetics and a notorious volume change with an ambiguous reaction mechanism upon cycling. Herein, the phosphorus nanoparticles have been rationally encapsulated into a commercial porous carbon through an evaporation-condensation strategy. Benefitted from the improved structural integrity/stability of electronically/ionically insulating phosphorus in a conductive/robust carbon matrix with abundant K + /electron migration channels, the phosphorus/carbon anode material with an appropriate phosphorus content (59.4 wt%) would achieve a large initial charging capacity of 744 mA h g −1 at 100 mA g −1 and a highly reversible capacity of 212 mA h g −1 at 3200 mA g −1 over 10,000 cycles with a superior rate capability of 287 mA h g −1 at 11,200 mA g −1 . Simultaneously, the electrochemical importance of phosphorus loading on potassium storage capability of derived phosphorus/carbon composites was also uncovered. Critically, the noticeable capacitive intercalation/extraction of K + in carbon nanostructure would significantly boost the charge storage process and promote the electrochemical performance of phosphorus/carbon anode. In terms of reaction mechanism for phosphorus/carbon anode, the active phosphorus would prefer to proceed a potassiation below 0.5 V upon discharging and a depotassiation below 1.0 V upon charging, accompanied by a reversible emergence/decomposition of K 4 P 3 . This novel study shedding lights on nanostructure design and mechanism clarification of phosphorus anode would contribute to the development of high-energy and long-life PIBs in practical applications.
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DALTON TRANSACTIONS
·
2020
·Vol. 49
·期 46
·17026-17032
·
IF 4.174
Miao Wang,Guo-Ming Weng,Ghulam Yasin,Mohan Kumar,Wei Zhao
Tin phosphide (SnxPy) is considered as an alternative anode material for lithium-ion batteries (LIBs) due to its high theoretical lithium-storage ability. Herein, carbon-coated SnP/C and Sn4P3/C composites are obtained via a facile solid-phase method for the first time. Subsequently, the lithium storage performances of SnP/C and Sn4P3/C are investigated in coin-cells, demonstrating a significantly high lithiation capacity and outstanding stability due to the introduction of carbon. Typically, the SnP/C anode delivers a very high specific capacity up to 751 mA h g−1 at 0.1 A g−1 and a specific capacity of 610 mA h g−1 with a long cycling life of 500 cycles at a current density of 1.0 A g−1, while the Sn4P3/C anode yields 727 mA h g−1 at 0.2 A g−1 after 100 cycles. The specific capacities achieved here are remarkably higher than those of any other tin phosphide materials reported in previous studies. Moreover, the stability and cycling performance of these materials are significantly better in comparison with the previous studies, manifesting the best lithium-storage capacity performance of the SnxPy anode to date.
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PubMed
高影响因子
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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Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 10
·6432-6441
·
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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JOURNAL OF POWER SOURCES
·
2020
·
IF 8.247
Fengchen Zhou,Xu-Sheng Yang,Jiangwen Liu,Jun Liu,Renzong Hu,Liuzhang Ouyang,Min Zhu
Titanium phosphide (TiP 2 ) is particularly interesting due to its ability to form the stable Li–Ti–P ternary phase. However, TiP 2 faces the limitations in cyclic stability due to the volume change occurred by the destruction/recovery of the long-range cubic order Li–Ti–P phase, and unable to deliver high capacity. In this work, we propose the in-situ formation of electrochemically inactive TiP and phosphorus via partial decomposition of TiP 2 by ball milling process, achieving a multi-phase TiP 2 –TiP–P–C composite. On one hand, the decomposition-formed TiP effectively relieve the stress caused by the formation of Li x TiP 4 and LiP 3 . On the other hand, another decomposition-formed small-sized phosphorus significantly reduce its volume change during the lithiation/delithiation cycles for the overall capacity. Accordingly, the synthesized multi-phase TiP 2 –TiP–P–C with the above cooperative effects delivers a high capacity of 836.3 mAh g −1 at 0.2 A g −1 as high-performance Lithium-ion battery anode. In addition, a notable capacity retention of 81.4% is also achieved after 1000 cycles at 5 A g −1 . Furthermore, when paired with LiFePO 4 cathode in a full cell, the excellent specific capacity, cycling and rate performance can also be obtained. The rational design of TiP 2 –TiP–P–C will be beneficial towards the future development of metal-phosphide-phosphorous composite as LIB anode.
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Inorganic Chemistry Frontiers
·
2021
·Vol. 8
·期 7
·1810-1818
·
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 POWER SOURCES
·
2020
·
IF 8.247
Yiping Hu,Yang Liu,Xuefeng Long,Yu Long,Feng Li,Dongsheng Ma,Ping Ma,Ming Chen,Lili Gao,Jun Jin,Jiantai Ma
By designing the morphology and architecture of employed electrocatalysts , the development of high-performance hydrogen evolution reaction (HER) electrocatalysts for electrolytes with a wide pH range is practical significance for future energy conversion technologies. Herein, we synthesize an electrocatalyst composing of two-dimensional (2D) ultrathin ternary pyrite-type cobalt phosphosulfide nanosheets and conductive carbon black (CoPS NSs/C) by the one-step phosphosulfide process. Thanks to the introduction of the C, the composite not only presents a unique three-dimensional (3D) interconnected reticulum structure but also effectively reduces the thickness of nanosheets. The as-synthesized electrocatalyst exhibits remarkable small overpotential toward HER in wide pH range. Meanwhile, the electrocatalyst owns higher charge transfer rate and excellent stability. The good performance is mainly attributed to the combination of the advantages of both 2D nanosheets and 3D interconnected reticulum structure, which offers larger surface area, sufficient active sites and more contaction with electrolytes. This work provides a new method for preparing ultrathin ternary transition-metal phosphosulfide (TMPS) nanosheets, and offers a facile route for improving electrocatalytic activity by designing synergistic morphology of 2D and 3D.
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INORGANIC CHEMISTRY
·
2021
·
IF 5.165
Peng Zhang,Shen-Jing Ji,Dong Zhang,Huai-Guo Xue,Nian-Tzu Suen
Recently, it has been reported that the enstatite chondrite (EC) meteorite may contain enough hydrogen to provide a plausible explanation for water’s initial existence on Earth. Perryite mineral is one of the key components of EC, but its detailed chemical composition and phase width remain elusive compared with other minerals found in EC. Therefore, we embark on a series of investigations of the synthesis, crystal structure, and electronic structure of the synthetic perryite mineral (NixFe1–x)8(TyP1–y)3 (T = Si and Ge; 1 ≥ x, y ≥ 0). Its crystal structures were established based on single-crystal and powder X-ray diffraction techniques. It is realized that its structural and phase stabilities are highly dependent on the nature of the doping element (i.e., Fe and Si). The inclusion of Si and Fe elements can greatly alter the bonding scheme near the Fermi level (Ef), which is vital to the phase stability and accounts for the chemical composition of the natural perryite mineral (quaternary compound) in EC meteorites. Furthermore, this phase exhibits good electrocatalytic activity toward the hydrogen evolution reaction (HER). The best and the worst HER performances are for the Ni8Ge2P and Ni8Si2P samples, respectively, which suggests that the long bond length and high polarity of the covalent bond are the preferred criteria to enhance the electrocatalytic HER in this series.
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