查找使用阿拉丁产品的科研文献

MoP/Co2P Hybrid Nanostructure Anchored on Carbon Fiber Paper as an Effective Electrocatalyst for Hydrogen Evolution

Panpan Zhou,Yaqi Zhang,Bo Ye,Shan Qin,Rongrong Zhang,Tianyun Chen,Huajian Xu,Lei Zheng,Qinghua Yang

Graphical Making a splash : The hybrid nanostructure MoP/Co 2 P /CFP was achieved first by a facile hydrothermal approach to obtain Co(CO 3 ) 0.35 Cl 0.20 (OH) 1.10 NA/CFP, followed by deposition of MoO 2 nanoparticles via CVD in the presence of MoO 3 and a subsequent in situ phosphorization process. The catalyst afforded an overpotential of 140 mV at a current density of 10 mA cm −2 , a Tafel slope of 80 mV dec −1 and exhibited superior stability and durability in long-term durability test. Developing low-cost and effective electrocatalysts for the hydrogen evolution reaction (HER) to replace Pt-group metals is a continuous challenge. Recently, transition metal phosphides have received increasing attention owing to their high intrinsic activity in catalyzing HER in acidic media. Herein, we reported a novel hybrid nanostructure MoP/Co 2 P anchored on carbon fiber paper (CFP) (MoP/Co 2 P/CFP) which was achieved by a facile hydrothermal approach to obtain Co(CO 3 ) 0.35 Cl 0.20 (OH) 1.10 nanowires array (NA)/CFP, followed by deposition of MoO 2 nanoparticles via chemical vapor deposition (CVD) in the presence of MoO 3 and a subsequent in situ phosphorization process. It was worth noting that the catalyst exhibited higher catalytic activity for HER in 0.5 M H 2 SO 4 solution, which afforded an overpotential of 140 mV at a current density of 10 mA cm −2 , a Tafel slope of 80 mV dec −1 , an exchange current density of 0.153 mA cm −2 and a high electrochemical double-layer capacitance (C dl ) of 48.2 mF cm −2 . Moreover, it also exhibited superior stability and durability in long-term durability test.

A dye-sensitized solar cells with an efficiency of 10.01% based on the MoP/MoNiP2@Ti3C2 composite counter electrode

Y. He,G. Yue,J. Huo,C. Dong,G. Xie,F. Tan

Transition metal phosphides are becoming a main study topic in new catalytic materials field due to their similar properties to transition metal nitrides and carbides as well as their excellent reaction activity and catalytic selectivity for deep hydrodesulfurization and hydrodenitrogenation . Mxene, a two-dimensional layered material with high specific surface area and electrical conductivity , plays an important role in accelerating catalytic reduction of triiodide ion in dye-sensitized solar cells (DSSCs). In this work, the MoP/MoNiP 2 hybrid was synthesized while adopting Ti 3 C 2 Mxene to realize the intercalation structure of composite with simple conditions, therefore enabling a formation of ‘pillared effect’ in Ti 3 C 2 Mxene. The optimized MoP/MoNiP 2 @Ti 3 C 2 composite was achieved by adjusting the doping ratio of the two. The DSSCs based on the MoP/MoNiP 2 @Ti 3 C 2 catalyst with 80 wt% Ti 3 C 2 doping reache an enhancement of power conversion efficiency of 10.01%, much higher than that of the platinum counter electrode (8.22%). Through a suite of morphological and electrochemical analyses, we summarize the reasons for the performance enhancement to the synergistic effect of the MoP/MoNiP 2 hybrid and Ti 3 C 2 Mxene, and especially, the unique intercalation structure of MoP/MoNiP 2 @Ti 3 C 2 with ‘pillared effect’. The MoP/MoNiP 2 @Ti 3 C 2 counter electrode with perfect electrochemical and photoelectrochemical properties is a promising alternative to the platinum electrode for DSSCs in the future.

Constructing abundant interfaces by decorating MoP quantum dots on CoP nanowires to induce electronic structure modulation for enhanced hydrogen evolution reaction

Yuanyuan Chen,Tingting Sui,Chaojie Lyu,Kaili Wu,Jiwen Wu,Meifang Huang,Ju Hao,Woon-Ming Lau,Chubin Wan,Dawei Pang,Jinlong Zheng

Interface engineering is a method of enhancing catalytic activity while maintaining a material's surface properties. Thus, we explored the interface effect mechanism via a hierarchical structure of MoP/CoP/Cu3P/CF. Remarkably, the heterostructure MoP/CoP/Cu3P/CF demonstrates an outstanding overpotential of 64.6 mV at 10 mA cm−2 with a Tafel slope of 68.2 mV dec−1 in 1 M KOH. DFT calculations indicate that the MoP/CoP interface in the catalyst exhibited the most favorable H* adsorption characteristics (−0.08 eV) compared to the pure phases of CoP (0.55 eV) and MoP (0.22 eV). This result can be attributed to the apparent modulation of electronic structures within the interface domains. Additionally, the CoCH/Cu(OH)2/CF‖MoP/CoP/Cu3P/CF electrolyzer demonstrates excellent overall water splitting performance, achieving 10 mA cm−2 in 1 M KOH solution with a modest voltage of only 1.53 V. This electronic structure adjustment via interface effects provides a new and efficient approach to prepare high-performance hydrogen production catalysts.

Strongly coupling Cu with MoP for high-efficiency electrochemical nitrate-to-ammonia conversion and zinc-nitrate battery applications

Chen Yang,Yuanyuan Chen,Zhimin He,Rong Li,Xinglong Gou

The electrochemical nitrate reduction reaction (NITRR) offers a sustainable route for ammonia synthesis and environmental remediation but faces challenges such as sluggish kinetics and competing hydrogen evolution. This study aims to address these limitations by designing a Cu/molybdenum phosphide (MoP) heterostructure catalyst through one-pot calcination, which integrates Cu nanoparticles with MoP nanograins. Structural and electronic analyses confirm the formation of intimate Cu–MoP interfaces, where charge redistribution polarizes Cu to an electron-deficient state (Cuδ+) and enriches MoP with electrons. This configuration enhances nitrate adsorption on Cuδ+, while MoP efficiently supplies protons via accelerated water dissociation. The Cu/MoP catalyst achieves a record-high NH3 Faradaic efficiency (FE) of 98.93% and a yield rate of 30.72 mmol h−1 cm−2 at −0.5 V (vs. RHE), outperforming isolated Cu or MoP. When deployed in a Zn-nitrate battery, the composite cathode delivers a peak power density of 12.97 mW cm−2. This work provides a promising solution to the insufficient active hydrogen supply and poor NH3 conversion efficiency of Cu-based nitrate reduction catalysts.

MoP nanoparticles dispersed on P, N co-doped graphite nanosheets as separator-modified material in high-loading lithium-sulfur batteries

Jinwei Tian,Yu Cui,Lele Zhang,Chao Peng,Xiangfei He,Liang Chen,Yulin Bai,Chunli Guo,Yuede Pan,Gang Li,Yanzhen Liu,Han Chen

The cruising range of lithium batteries in new energy vehicles became main issue, so lithium-sulfur batteries (LSBs) with high theoretical energy density are becoming great expectations. However, the polysulfide-shuttle behavior and slow redox kinetics of the electrochemical processes result in a fast capacity and cycle life fade in LSBs, especially at high sulfur loads. In this paper, MoP nanoparticles were dispersed on P, N co-doped graphitic nanosheets (MoP/PNC) by one-step high-temperature phosphating method, which as a separator-modified material achieved an excellent electrochemical performance. The initial discharge specific capacity can reach 1470 mAh g −1 at a current density of 0.2C and the capacity attenuation per cycle in 600 cycles is only 0.074% (1C). Surprisingly, LSBs with MoP/PNC -modified separator can deliver a high area capacity of 9.30 mAh cm −2 with a sulfur loading up to 7.43 mg cm −2 on the positive electrode. The above-mentioned excellent electrochemical performances benefited from the synergistic effects of strong catalytic conversion ability of MoP and the physical/chemical adsorption and catalytic capability of PNC, which resulted in low polysulfide permeability and high sulfur utilization.

Interface Engineering and Heteroatom Doping Trigger Multisite Synergism in V-Incorporated MoP/Cu3P to Accelerate Alkaline Hydrogen Evolution

Xueting Li,Guimin Wang,Chunmei Lv,Xiuwen Wang,Yue Liu,Haijing Yan,Zilin Zhang,Yanqing Jiao

Efficient non-Pt electrocatalysts for the alkaline hydrogen evolution reaction (HER) are necessary for industrial water electrolysis. Cu-based materials are cheaper alternatives, but their performances are far from satisfactory due to slow water dissociation kinetics and weak Gibbs free energy of hydrogen adsorption (ΔGH*). Herein, we propose to construct multiple sites with different activation functions in response to sluggish alkaline HER kinetics. A multi-interfacial, ultrasmall V-doped MoP and Cu3P heterostructure (V-MoP/Cu3P) was successfully fabricated by confined conversion of a V–Mo bimetallic polyoxometalate (POM) cluster embedded in a Cu-based metal–organic framework (MOF). The spatial separation of each POM cluster by the MOF and the inherent structure of each [VO6] connecting four [MoO6] octahedrons enable precise V incorporation in the MoP lattice and multi-interface coupling of the MoP and Cu3P heterojunction. As a result, the interfacial charge redistribution occurs and the d-band centers are finely tuned, triggering a multisite synergism to encourage the adsorption and activation of H2O, H–OH* bond breaking, and H2 release. Consequently, V-MoP/Cu3P exhibits significantly enhanced HER activity, even superior to the commercial 20% Pt/C catalyst at current densities exceeding 155 mA cm–2, which indicates the feasibility of the V-MoP/Cu3P catalyst as cheaper alternatives to Pt-based catalysts in industrial applications. This work provides new insight for the design of low-cost, high-abundance HER catalysts via multi-interface engineering and heteroatom doping to trigger multisite synergies.

Electronic/mass transport increased hollow porous Cu3P/MoP nanospheres with strong electronic interaction for promoting oxygen reduction in Zn-air batteries

Man Guo,Meijiao Xu,Yuan Qu,Chuan Hu,Puxuan Yan,Tayirjan Taylor Isimjan,Xiulin Yang

Developing high-efficient non-noble metal-based catalysts for oxygen reduction reaction (ORR) is an inevitable way to improve Zinc-air batteries' performance (ZAB). Herein, we report a Cu 3 P/MoP electrocatalyst (Cu 3 P/MoP@C) supported by hollow-porous-carbon nanospheres displaying high electrocatalytic activity and exceptional durability in alkaline media. The optimized ORR catalyst outperformed the benchmark Pt/C (20 wt%) and most recently reported Cu-/Mo-based catalysts in various aspects. X-ray photoelectron spectroscopy reveals that the excellent ORR performance originates from the charge transfer between of Cu 3 P and MoP species. Besides, the large specific surface area of Cu 3 P/MoP@C with mesoporous structure is particularly advantageous for the inner surface contact with electrolyte to accelerate ORR kinetics. Moreover, Cu 3 P/MoP@C also exhibits a large power density of 156 mW cm −2 , a high round-trip efficiency, and superb stability over 231 h superior to Pt/C in the ZAB. This work offers a scalable and promising approach for the rational fabrication of hollow porous structure materials.

Component identification of subsurface food additives by spatially offset Raman spectroscopy

Qiu-Shi Liu,Ming-Jiang Ma,Chong Lv,Guo-Qing Yang,Yan-Lei Yang,Jia-Hao Wang,Zhi-Xing Gao,Hong-Yu He,Xiao-Hua Zhang,Yuan-Peng Li,Bao-Zhen Zhao

Spatially offset Raman spectroscopy (SORS) is an important branch derived from conventional Raman spectroscopy. It has the characteristics to realize the concealed component identification covered by opaque and translucent media nondestructively and rapidly. This technology gradually plays an important role in basic and applied research of numerous areas. This paper focuses on the SORS potential application in food quality and safety inspection, and a SORS detection system has been setup. The ingredients of various concealed food additives have been identified by SORS and the optimum offset distance for detection has been obtained. Meanwhile, the identification effectiveness of the system for low-concentration additives in real foods has also been evaluated.

Ultra-Sensitive Cancer Cell Detection Based on the Vernier Effect of Taper-In-Taper Structured Optical Fibers

Zhengqi Wang,Yangliu Zhou,Bo Qian,Mingya Yang,Xiaonan Zhang,Benli Yu,Sheng Zhou

Early diagnosis of cancer is the key to improving the cure rate, but traditional detection methods (such as tissue biopsy and imaging examinations) often have problems such as strong invasiveness, insufficient sensitivity, or high cost. In this work, an ultrasensitive microfiber interferometer biosensor is proposed for cancer cell detection. An ultra-high refractive index (RI) sensitivity of 15225.665 nm/RIU was achieved by cascading two taper-in-taper structured fiber (TITF). TITF that is functionalized with biotin was employed to identify the biotin receptor protein (streptavidin) and the cancer cell exhibiting overexpression of surface biotin receptors (Human Hepatocellular Carcinoma Cells, HepG2). The results of the experiments indicate that in the standard buffer sample, the detected concentrations of streptavidin (SA) were 11, 23, 46, and 92 pM, respectively, with a detection limit of 1.4 pM. The log-linear concentrations of HepG2 cells are 10, 10 2 , 10 3 , and 10 4 cells/mL, respectively, with a detection limit of 4 cells/mL. The specificity test revealed that TITF showed a lack of sensitivity to normal cells, particularly human acute monocytic leukemia cells (THP-1) and human colorectal adenocarcinoma epithelial cells (HCT116). The proposed biosensor has good selectivity and sensitivity, providing a feasible method for the early diagnosis of cancer.

ssDNA-Functionalized Optical Fiber SPR Sensor for Trace Dopamine Detection

Xiang Li,Rui-jie Tong,Yu Wang,Lu-yao Wang

Dopamine, as a neurotransmitter, is essential for maintaining the function of the extrapyramidal nervous system. This article introduces an optical fiber sensor based on surface plasmon resonance (SPR) for detecting trace dopamine. The SPR effect is induced by an Au film coated on a plastic-cladding optical fiber. The specificity for dopamine is achieved through an aptamer, while graphene serves as a mediator between the gold-coated optical fibers and adapters. The sensor shows a linear sensitivity of 0.853 nm/log(M) over a dopamine concentration range of 10 −11 to 10 −4 M, with a detection limit of 1 × 10 −11 M. Compared with existing dopamine detection methods, the proposed sensor exhibits a lower detection limit, a sufficiently wide linear range, and broad application prospects in biosensing.

New Route for Synthesis of MeO-MOP

Qingle Zeng,Hui Zeng,Zhiren Yang

Non-Negligible Oxygen Atoms in Transition Metal Phosphides: Research on the Role of Oxygen in Hydrodechlorination

Lu Zhang,Guojun Yuan,Xinyu Wang,Jianliang Bai,Yaqing Zhu,Lili Ren

Environmental pressure gives potential for the application of transition metal phosphides (TMPs), which serve as efficient degradation catalysts. Although various efforts are advocated to obtain high activity, it is still difficult for phosphides to exhibit cycle performance in hydrodechlorination (HDC), limiting their practical development. By linking the changes in the oxidation state of MoP before and after HDC with its catalytic performance, the Mo–P–O bond is found to be the active catalytic site, not only promoting electron transfer but also forming the defect-rich structure. Based on this, H2O2-treated MoP after HDC reached a performance of 19.9%, and the activity could be restored after multiple cycle reactions, while the untreated one still had poor performance, demonstrating that carrying out the H2O2 treatment process can realize the recycling of MoP, which is of importance for industrial application of catalysts.