APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Yingying Jiao,Yike Li,Jianshe Wang,Zhanhang He,Zhongjun Li
Photocatalyst with double Z-scheme mechanism can promote the separation and transmission of photo-induced carriers effectively. In this work, a novel C 3 N 4 nanotube (CNT)/N-doped carbon dots (NCDs)/Ni 2 P composite photocatalyst was prepared by decorating NCDs and Ni 2 P nanoparticles on CNT, respectively. A variety of test results, including photoluminescence spectra (PL), electrochemical impedance spectrum (EIS) and transient photocurrent responses (TPR), show that compared with CNT and CNT/Ni 2 P, CNT/NCDs/Ni 2 P composite can dramatically facilitate the separation and transmission of charge. Impressively, the CNT/NCDs/Ni 2 P composite achieves a hydrogen evolution rate of 627.2 µmol g -1 h −1 which is well above that of CNT and CNT/Ni 2 P, respectively (no detection and 48.5 μmol g -1 h −1 ). Combining the above characterization results with energy band calculation, we speculate that the remarkably optimized photocatalytic activity was predominantly ascribed to the double Z-scheme charge transfer mechanism for CNT/NCDs/Ni 2 P nanocomposite. This work provides a new member for family of photocatalysts with double Z-scheme mechanism, which is beneficial to further fundamental and applied research.
研究领域:
材料科学
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能源化学
·
光催化
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Ling Li,Longcheng Zhang,Lichen Gou,Siqi Wei,Xiandeng Hou,Li Wu
Electrocatalytic methanol oxidation reaction (MOR) is a promising alternative approach to oxygen evolution reaction for efficient hydrogen production. However, developing highly efficient and cost-effective MOR catalysts, coupled with the cathodic hydrogen evolution reaction, is still a challenge. Herein, we used a Ni 2 P nanosheet array with Cu 2 O-Cu dendrites on nickel foam (Cu 2 O-Cu@Ni 2 P/NF) as an efficient and stable electrocatalyst for MOR, which attained a low potential of 1.41 V at 100 mA cm −2 and a small Tafel slope of 44.99 mV dec –1 with excellent stability for at least 24 h in 1.0 M KOH solution with 1.0 M methanol. In situ Raman spectroscopy reveals that Cu 2 O-Cu promotes the generation of the β-NiOOH active phase, and converts to Cu(II)O under the electrolysis conditions. Furthermore, the methanol electrolysis cell utilizing Cu 2 O-Cu@Ni 2 P/NF as both the cathode and anode delivered a current density of 10 mA cm −2 at a low cell voltage of 1.40 V, and the cell voltage decreased by 210 mV at a current density of 100 mA cm −2 compared to water electrolysis. This work provides a new strategy to design the promising Ni-based phosphide as a bifunctional electrocatalyst in methanol electrolysis, enabling energy-saving H 2 production.
研究领域:
材料科学
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电化学
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能源工程
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
·
IF 9.965
Lei Hu,Liujun Jin,Tingyu Zhang,Jianhua Zhang,Jinghui He,Dongyun Chen,Najun Li,Qingfeng Xu,Jianmei Lu
The electronic modulation and morphology control of electrocatalysts are effective strategies to improve their catalytic performance. Herein, MoO 2 -MoO 3 /Ni 2 P nanoflowers were fabricated on the skeleton of conductive nickel foam as an electrocatalyst with enhanced performance via a universal hydrothermal and phosphating method. The introduction of P and Mo into the nickel-based catalyst through the co-doping strategy effectively adjusted the electronic structure of the Ni active sites, thereby significantly improving the performance of the catalyst. Particularly, the introduction of Mo allowed adjusting the morphology of the material, thereby increasing the electrochemical active area and promoting the exposure of more active sites. This strategy for improving the electrocatalyst’s performance in urea-assisted water splitting will provide a new concept for the simultaneous mitigation of the energy crisis and environmental contamination.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Zhiqiang Zhang,Xiaofeng Lin,Shuli Tang,Haijiao Xie,Qitong Huang
Efficient, stable and low-cost catalysts are essential for improving the efficiency of hydrogen evolution reactions . Herein, the MoO 2 @Ni 2 P heterostructure electrocatalyst was synthesized in a self-supported system on a carbon paper (CP) by two-step deposition and phosphorization at low temperature. The self-supported nanoarray structure makes the catalyst to effectively and efficiently transfer electrons and exposes more of its active sites. Moreover, the strong interaction between Ni 2 P and MoO 2 helps to effectively optimize the electronic structure. The density of states calculations demonstrate that there is an increase in the density of electronic states near the MoO 2 /Ni 2 P Fermi level . This shows that MoO 2 /Ni 2 P has fast charge transfer kinetics. MoO 2 modulates the d-band center of nickel, resulting in moderate adsorption/desorption of hydrogen. The above results show that MoO 2 @Ni 2 P has good hydrogen evolution activity. The experimental results show that the overpotential (η 10 ) of MoO 2 @Ni 2 P/CP in the alkaline environment is only 57 mV with a Tafel slope of 61 mV dec −1 . It is similar to the commercial noble-metal catalysts and outperforms most reported catalysts.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
GREEN CHEMISTRY
·
2021
·Vol. 24
·期 2
·877-884
·
IF 10.182
Baolong Zhang,Hui Fu,Tiancheng Mu
Electrochemical oxidation of 5-hydroxymethylfurfural (HMF) to 2,5-furandicarboxylic acid (FDCA) has drawn wide attention recently. Rational interface engineering can modulate the electronic structure, tune the adsorption energy and endow the hybrid material with more active sites for HMF electrochemical oxidation. Herein, we propose a strategy for the synthesis of metal sulfide/metal phosphide (MSx/MPy, M = Co, Fe, Ni…) nanotube arrays with abundant interfaces by the sequential electrodeposition interface engineering method. Since Ni-based electrocatalysts show high efficiency for the electrochemical oxidation of HMF, we designed and synthesized interface-rich heterogeneous NiSx/Ni2P nanotube arrays. The abundant interfaces promote electron transfer between NiSx and Ni2P, which synergistically improves the oxidation state of the Ni species and further enhances the electrocatalytic performance of HMF oxidation. The NiSx/Ni2P electrocatalyst shows superb HMF oxidation activities with a low onset potential of 1.25 V vs. RHE. A current density of 20 mA cm−2 can be reached at 1.346 V vs. RHE, which is reduced by 204 mV compared with that with water oxidation. Chronoamperometry electrolysis reveals that HMF conversion is nearly 100% and FDCA selectivity can reach 98.5%.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2023
·
IF 22.1
Fu-Li Wang,Na Xu,Cheng-Jie Yu,Jing-Yi Xie,Bin Dong,Xin-Yu Zhang,Yi-Wen Dong,Yu-Lu Zhou,Yong-Ming Chai
Limited by sluggish mass and charge transfer in anion exchange membrane (AEM) water electrolysis, designing high crystalline phase and superior conductivity electrocatalysts for oxygen evolution is crucial in promoting application of hydrogen. Herein, maple leaf-shaped porous heterojunction (Ni 2 P/Ni 7 S 6 ) is fabricated by one-step molten salt method. Benefited from rich porosity and high crystal structure, the target catalyst with abundant active sites and great mechanical strength only requires the overpotentials of 330 mV to reach 1000 mA cm −2 , and can sustain at 500 mA cm −2 for 700 h. Besides, characterizations and theoretical calculations reveal that strong interaction between Ni 2 P and Ni 7 S 6 leads to a depleted electron density in Ni sites and optimizes the adsorption energy of *OOH and H 2 O, achieving favorable kinetics and superior conductivity. Meanwhile, assembled AEM water electrolyzer delivers 1000 mA cm −2 at a cell voltage of 1.88 V, operating at the average energy efficiency of 72 % for 140 h.
研究领域:
材料科学
·
电化学
·
能源催化
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2025
·
IF 4.8
Wenbin Qu,Lixin Song,Guixiang Peng,Xiaoli Shao,Yang Wang,Pingfan Du,Jie Xiong
Petroleum-derived PET plastics and fibers are widely used in packaging and textile applications due to their superior properties and have become a major source of plastic waste. In this study, Ni 2 P-Co x P/ZrO 2 /C NFs p-n heterojunction photocatalytic system with the UiO-66-NH 2 metal-organic backbone (MOFs)-derived ZrO 2 (U-ZrO 2 ) was constructed by a combined method of electrospinning, carbonization, hydrothermal, and phosphorization process. Carbon nanofibers are used as carriers to combine the different components effectively. The Ni 2 P-Co x P/U-ZrO 2 /C NFs show strong light absorption ability throughout the entire visible light region. The needle-shaped structure formed by Ni 2 P-Co x P can provide abundant active sites, increase the reflection of light on the fiber surface, and promote the utilization of light by the photocatalyst. With the incorporation of the MOF structure, the specific surface area of the fibers was greatly enhanced. The coupling of Co x P with Ni 2 P and U-ZrO 2 establishes a p-n heterojunction at the photocatalytic interface, which promotes the separation efficiency of photogenerated carriers and prolongs the charge lifetime while maintaining the strong redox capacity of the catalyst, enhancing the photocatalytic degradation activity. The MOF-derived ZrO 2 still maintains an octahedral shape, which favors the attachment of Ni 2 P and Co x P. As a result, the hydrogen production of the system reached 303.64 μ mo l H 2 g Sub − 1 after 24 h, and the weight loss rate of PET reached 18.77 ± 4.28%. Besides, the reusability of the catalyst was greatly improved by re-phosphorization of the used catalyst, which enables it to recover its catalytic degradation efficiency. This work provides new insights into the rational design of heterojunction photocatalysts with superior degradation performance.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Lin Wei,Deqian Zeng,Jieqian Liu,Hongfei Zheng,Toyohisa Fujita,Minyi Liao,Chunyi Li,Yuezhou Wei
Metal selenide semiconductors have been rarely used for photocatalytic water splitting because of their poor stability and severe photocorrosion properties. Hence, designing stable metal selenides with suitable bandgap energies has considerable practical significance in photocatalytic H 2 evolution. In this work, a novel series of Zn x Cd 1-x Se (x = 0 ∼ 1) with tunable band structure were fabricated through a simple solvothermal method. Impressively, the ZnSe exhibited a maximum H 2 production rate of 1056 µmol g −1 h −1 , which was higher than that of CdSe and Zn x Cd 1-x Se solid solutions. Such visible-light photoactivity for water reduction to H 2 was attained even after 6 cycling photocatalytic experiments. Moreover, the two-dimensional (2D) Ni 2 P nanosheets act as a high-efficiency cocatalyst integrated with Zn x Cd 1-x Se semiconductor to boost photocatalytic H 2 generation performance. The optimal 8% Ni 2 P/ZnSe composites displayed excellent cycling stability and superior photocatalytic H 2 evolution performance (4336 µmol g −1 h −1 ), which was about 4.1 times that of pure ZnSe under visible light irradiation. Photoelectrochemical (PEC), photoluminescence (PL), and time-resolved photoluminescence (TRPL) measurements reveal that the improved photoactivity Ni 2 P/ZnSe photocatalysts were ascribed to the effective separation and migration of photoinduced carriers. The present work paves a pathway to explore the fabrication of Zn x Cd 1-x Se solid solutions and the hybridization of 2D transition metal phosphides nanosheets toward photocatalytic applications.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Energy Materials
·
2023
·
IF 6.4
Lele Lu,Qiang Li,Runhao Zhang,Jialong Jiang,Shiqi Zhang,Jiachen Guo,Peng Cheng,Wei Shi
Transition-metal phosphides (TMPs) are regarded as ideal HER electrocatalysts owing to their rich reserve, flexible composition, competitive activity, and excellent stability. Yet, TMPs still suffer from poor electrical conductivity and agglomeration under a high synthetic temperature of the solid-state reaction. Benefiting from the monodisperse metal sites with organic matrix surrounded, metal–organic frameworks (MOFs) have great potential as a feedstock to produce MOF-derived TMPs with tailored microenvironments of the active sites. Herein, a series of nanostructured Ni2P@SNC were facilely fabricated by a one-step phosphorization of a well-designed Ni-MOF with red phosphorus as a “P” source. The optimal Ni2P@SNC-800 displayed an overpotential of 80 mV in 1.0 M KOH and 97 mV in 0.5 M H2SO4 at 10 mA cm–2, demonstrating excellent HER performance as well as long durability in both electrolytes. The comprehensive performance of Ni2P@SNC-800 surpasses that of other heteroatom-free MOF-derived Ni2P significantly. This work provides a facile approach for the design and synthesis of MOF-derived TMPs coated with a heteroatom-doped carbon matrix as an electrocatalyst with high activity.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Yumin Zhou,Rongyao Li,Lihui Dong,Shibin Yin,Bingxian Chu,Zhengjun Chen,Jiaxiang Wang,Bin Li,Minguang Fan
Developing a high-performance electrocatalyst for hydrogen evolution reaction (HER) requires a comprehensive consideration of the three key factors, that is, intrinsic activity, electric conductivity, and active site number. Herein, we report the facile synthesis of a self-supported Ni2P/WO2.83 heterointerface microsphere as a highly active and low-cost catalyst for alkaline HER, which has simultaneously addressed these key issues by a joint application of heterointerface construction and defect and architecture engineering strategies. Our density functional theory calculations revealed Ni2P and WO2.83 optimized by the interface coupling effect work in concert to improve the intrinsic activity of the catalyst. Importantly, the metalloid Ni2P in an intimate combination with the oxygen-defect-rich WO2.83 species endowed the electrocatalyst with high conductivity. Furthermore, the Ni2P/WO2.83 electrocatalyst presented a superhydrophilic nanostructure, ensuring abundant active sites and their accessibility. Benefiting from these attributes, the obtained Ni2P/WO2.83 heterointerface electrocatalyst exhibited excellent activity along with favorable stability for alkaline HER, especially at high current density, surpassing the most reported non-precious catalysts.
研究领域:
材料科学
·
电催化
·
理论计算
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2019
·Vol. 8
·期 6
·2995-3004
·
IF 10.733
Peng Wen,Kefei Zhao,Hui Li,Jiangsheng Li,Jing Li,Qing Ma,Scott M. Geyer,Lin Jiang,Yejun Qiu
Very recently, transition metal phosphides (TMPs) have emerged as low-cost and robust co-catalysts for decorating graphitic carbon nitride (g-C3N4) for photocatalytic hydrogen (H2) evolution. However, to date, little work has been done regarding the decoration approaches to hybridize TMPs on the g-C3N4 surface with homogeneous dispersion and intimate interfacial contact. Herein, we present a facile and convenient route to in situ incorporate g-C3N4 nanosheets (NSs) and Ni2P nanocrystal (NC) co-catalysts via a one-step co-heating solution approach. The Ni2P/g-C3N4 (in situ) hybrid photocatalyst achieved a far superior H2 production rate (2849.5 μmol g−1 h−1) and durability (no decrease after 4 cycles of reaction within 20 h) compared to the Ni2P/g-C3N4 (self-assembly) sample. The apparent quantum yield (AQY) of 18.8% at 420 nm was also much higher than that of other TMP co-catalyst loaded g-C3N4 hybrid photocatalysts. A possible Ni(δ+)–N(δ−) chemical coupling in the Ni2P/g-C3N4 (in situ) hybrid composite was proposed and corroborated by X-ray photoelectron spectroscopy (XPS) and X-ray absorption spectroscopy. The unique Ni(δ+)–N(δ−) chemical bonding states between g-C3N4 and Ni2P significantly accelerate the photo-generated charge-carrier separation and extraction from g-C3N4, as well as maintaining the H2 production durability. We believe that the hybridization route presented in this work will be extended to construct other TMP integrated photocatalysts toward efficient and stable solar water splitting.
研究领域:
材料科学
·
能源化学
·
表面化学
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Tianyue Su,Junsheng Wang,Chun Cai
The nickel phosphides have garnered increasing attention as an excellent catalytic site in the fields of electrocatalysis and hydrotreating, but their application in organic synthesis remains infrequent. In this study, ammonium phosphate and nickel chloride were employed as the doping sources for the first time to synthesize the Ni-based ZIF-8 precursor via the host–guest method. Subsequently, the precursor was pyrolyzed to obtain Ni2P nanoparticles (NPs) supported on N, P co-doped carbon. The composite materials exhibit elevated metal loading and effective dispersion due to the synergistic combination of phosphorus and nickel. Specifically, compared with Ni-NC, the optimal Ni2P-NCP-1 exhibits enhanced catalytic activity in the α-alkylation of arylacetonitriles with alcohols using KOH as the base. It shows a wide broad substrate scope at 140 °C for 12 h in n-octane using a hydrogen borrowing strategy. Through characterizations and mechanistic studies, it has been discovered that the introduction of P source not only provides more basic sites on carbon matrix but also leads to the formation of Ni2P NPs, which facilitates the catalytic efficiency by modifying the electronic structure of Ni. Compared with the metallic Ni species, the synergistic effect between Ni2P and acid-basic sites significantly influences the dehydrogenation of alcohols to generate Ni–H species. This study successfully achieves simultaneous phosphating of both the metal and support, and it also demonstrates that the N2P-NCP-1 catalyst has significant potential in the heterogeneous organic transformation field.
研究领域:
有机化学
·
材料科学
·
催化反应
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）