COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
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IF 5.2
Jiaojiao Xia,Peng Xu,Yiyang Chen,Jianlin Li,Long Li,Jiaojing Shao,Chuan Yu
Lithium-sulfur (Li-S) batteries are exceedingly restrained in practical application originating from the shuttling of soluble lithium polysulfides (LiPSs), despite their superelevated theoretical specific capacity as well as energy density . Herein, a flexible carbon nanofiber membrane in situ embedded with Co, CoP nanoparticles (Co-PCNF, CoP/Co-PCNF) was designed to fabricate a unique sandwich structure, as a free-standing cathode for Li-S batteries. These innovative Li-S batteries deliver an initial capacity of 993.5 mAh g −1 at 1 C, along with a substantial capacity of 814.18 mAh g −1 even over 300 cycles, which corresponds to a low capacity decay of only 0.06% per cycle. Besides, with a sulfur content of 4.5 mg cm −2 , an initial discharge capacity of 700.1 mAh g −1 was realized at 0.2 C with an excellent capacity retention rate of 91% over 200 cycles, prominent in long-cycle Li-S batteries. In this aspect, rosy cycling stability was achieved because of the impeded shuttle effect by the synergistic effect of Co and CoP compared with Co-PCNF sandwich structure as well as traditional aluminum foil. Moreover, underlying the DFT calculation, the enhanced overlap of electronic state ascribed to the conversion of fraction Co nanoparticles to CoP, triggering the adsorption capacity of CoP/Co-PCNF crucially higher than that of Co-PCNF. This observation paves ways into implementing the CoP/Co-PCNF sandwich structure as a free-standing cathode for the high-performance Li-S batteries.
研究领域:
材料科学
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电化学
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能源存储
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纳米技术
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产品关联
DOI
高影响因子
Journal of Materials Chemistry A
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2023
·Vol. 11
·期 43
·23270-23277
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IF 11.9
Xiaoyun Zhang,Shifan Zhu,Yixue Xu,Yuqiao Wang
The tip effect of the high curvature tip top can cause electromagnetic effects to improve the catalytic performance. Doping of transition metals (Cr, Fe and Mo) into CoP array nanocones alters the tip curvature of CoP to strengthen the tip effect with increasing curvature. The stronger tip effect of Fe-CoP improves OH− concentration, accelerates surface charge transfer and enhances the electric field for a higher catalytic efficiency. Fast charge transfer and high electronic conductivity are attributed to transition metal doping, which can be confirmed by theoretical simulations and experiments. The optimized d-band centre of Fe-CoP adjusts the appropriate adsorption strength of the reaction intermediates. Fe doping endows CoP with a higher curvature cone structure and optimizes electronic structure for high catalytic activity and reaction kinetics. Tip cone as special sites tuned by transition metal doping provides a strategy for efficient non-noble metal catalysis.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL CHEMISTRY
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2023
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IF 7.4
Ling Li,Longcheng Zhang,Lichen Gou,Siqi Wei,Xiandeng Hou,Li Wu
Metal–semiconductor composites are promising candidates for surface-enhanced Raman scattering (SERS) substrates, but their inert basal plane, poor active sites, and limited stability hamper their commercial prospects. Herein, we report a three-dimensional CoP nanowire array decorated with Au nanoparticles on carbon cloth (Au@CoP/CC) as a self-supporting flexible SERS substrate. The Au nanoparticles spontaneously grew on the surface of the CoP nanowire array to form efficient SERS hot spots by a redox reaction with HAuCl4 without any additional reducing agents. Such Au@CoP/CC substrate exhibited a limit of detection of 10–11 M using rhodamine 6G as a model dye with outstanding corrosion resistance ability even under extreme acid and alkali conditions, which is better than many recently reported Au-based SERS substrates. Finite-difference time-domain simulation results demonstrated that Au@CoP/CC can provide a high density of regions with intense local electric field enhancement. Moreover, Au@CoP/CC can degrade target organic dyes for the self-cleaning and reproduction of SERS-active substrates under visible light irradiation. This work provides a novel means of using the plasmonic metal-transition metal phosphide composites for high-performance SERS sensing and photodegradation.
研究领域:
材料科学
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纳米技术
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分析化学
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表面科学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Xiubin Zhu,Weizhe Zhang,Xin Wang,Ajing Ren,Minghua Huang,Seeram Ramakrishna,Zhicheng Liu
Prussian blue analog (PBA) and its derivatives have been widely used as electrocatalysts for hydrogen evolution reaction (HER). However, their large-scale application is limited by their low conductivity and easy aggregation. In this work, we have successfully decorated well-dispersed PBA-derived CoP nanoparticles on conductive electrospun carbon nanofibers through consecutive assembly, carbonization and phosphorization processes. The introduction of carbon nanofibers improves the conductivity of the catalyst and accelerates the electron transport . The unique nanostructure further optimizes the electrocatalytic performance of the CoP nanoparticles. As a result, the obtained electrocatalyst exhibited excellent HER performance with an overpotential of only 85 mV to achieve the current density of 10 mA cm −2 in 1.0 M KOH, and showed outstanding stability due to the protection of the carbon shell. Our work could be a guidance for the developing of advanced PBA-based electrocatalysts.
研究领域:
材料科学
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电化学
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纳米技术
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能源材料
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
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2021
·Vol. 9
·期 13
·8561-8567
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IF 12.732
Shuo Geng,Fenyang Tian,Menggang Li,Xin Guo,Yongsheng Yu,Weiwei Yang,Yanglong Hou
Tailoring the d-band center is an effective method to promote the hydrogen evolution reaction (HER) activity of electrocatalysts. Herein, we demonstrate that the d-band center can be tuned through a hole-creating method to enhance pH-universal HER activity using CoP as a basic platform. The density functional theory (DFT) calculation reveals that the d-band center and the valence electron number of Co sites around the holes are upshifted, which boosts H adsorption. In addition, introducing holes into the nanosheets of CoP can optimize the ΔGH* of the Co atoms around the holes. Inspired by the DFT results, a soft template method was developed to synthesize hole-rich CoP nanosheets. With the advantages of hole-rich and unique nanosheet features, the hole-rich CoP nanosheets show low HER overpotentials with only 84 and 94 mV to achieve a current density of 10 mA cm−2 in both acidic and alkaline media, better than that of the other dimensional counterparts. In addition, the hole-rich CoP nanosheets also show satisfactory stability after long-term HER tests. This strategy of regulating the d-band center is expected to be extended to other transition metal phosphide electrocatalysts for enhancing the HER performance.
研究领域:
材料科学
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电化学
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催化
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Chemistry
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2020
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IF 7.216
Han Wu,Yaojia Cheng,Boyang Wang,Yao Wang,Min Wu,Weidong Li,Baozhong Liu,Siyu Lu
Ammonia borane (NH 3 BH 3 , AB) is promising for chemical hydrogen storage; however, current systems for rapid hydrogen production are limited by the expensive noble metal catalysts required for AB hydrolysis. Here we report the design and synthesis of a highly efficient and robust non-noble-metal catalyst for the hydrolysis of AB at 298 K (TOF = 89.56 mol H2 min −1 mol Co −1 ). Experiments and density functional theory calculations were performed to explore the catalyst’s hybrid nanoparticle heterostructure and its catalytic mechanism. The catalyst comprised nitrogen-doped carbon dots confining CoO and CoP , and exhibited strong interface-induced synergistic catalysis for AB hydrolysis that effectively decreased the energy barriers for the dissociation of both AB and water molecules. The co-doping of N and P introduced numerous defects, and further regulated the reactivity of the carbon layers. The heterogeneous interface design technique presented here provides a new strategy for developing efficient and inexpensive non-noble-metal catalysts that may be applicable in other fields related to energy catalysis.
研究领域:
材料科学
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催化
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2021
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IF 19.503
Mengtian Jin,Xian Zhang,Run Shi,Qing Lian,Shuzhang Niu,Ouwen Peng,Qun Wang,Chun Cheng
For large-scale implementation of electrochemical hydrogen production , it is essential to develop electrocatalysts that work well at high current densities over a wide pH range. Herein, we use a facile method to synthesize a hierarchical bimetal phosphide (CoP@Ni 2 P) on nickel foam, which requires very low overpotentials to achieve the benchmark 10 mA cm −2 (e.g., 16 mV in alkaline media). Furthermore, the CoP@Ni 2 P can deliver a high current density of 500 mA cm −2 at small overpotentials and show no obvious decay after the durability test for over 48 h at all pH levels. The outstanding catalytic performance is attributed to the superaerophobicity of the electrode surface, fast electron transport as well as the increased number of exposed active sites caused by the hierarchical structure and the synergistic effect of the heterostructures. Consequently, this work provides an advanced transition metal-based phosphide for large-scale hydrogen production in all pH ranges.
研究领域:
材料科学
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电化学
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催化
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可再生能源
✓ 已验证
DOI
高影响因子
Materials Horizons
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2023
·Vol. 10
·期 9
·3761-3772
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IF 13.3
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.
研究领域:
材料科学
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催化
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电化学
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能源材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2023
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IF 7.2
Guoliang Gao,Dongwei Wei,Li Li,MingQi Wei,Xueli Chen,Yangyang Yu,Guang Yang,Guang Zhu,Lu Han,Jin Jia
Transition metal phosphates have proved to be promising electrocatalysts for hydrogen evolution reactions (HER) of water splitting, however, further increasing their active sites and catalytic activity remains a major challenge. Herein, accordion-like Co-MOF with layered structure was synthesized. After subsequent carbonization and phosphidization, lamellar heterostructured Co/CoP nanocrystals encapsulated in a P, N co-doped C matrix (Co/CoP@PNC) was obtained. Heterojunction provides abundant active sites and improves electron transfer rate. Additionally, the effect of phosphating degree on the electrocatalytic activity was studied. In the alkaline electrolyte , the current density of the optimized Co/CoP@PNC-10 for HER reached 10 mA cm −2 at overpotential of 137 mV in 1.0 M KOH, which was superior to most of transition metal-based electrocatalysts. This work provides new guidance for the design and development of transition metal-based electrocatalysts.
研究领域:
材料科学
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电化学
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
CARBON
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2019
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IF 7.466
Linghui Li,Li Song,Hairong Xue,Cheng Jiang,Bin Gao,Hao Gong,Wei Xia,Xiaoli Fan,Hu Guo,Tao Wang,Jianping He
The design and fabrication of robust and inexpensive bifunctional catalysts for oxygen evolution reaction and hydrogen evolution reaction are very necessary for producing hydrogen by water electrolysis . Herein, we propose a bi-functional CoP@N-doped porous carbon nanoplate (CoP@NPCP) electrocatalyst , in which CoP nanoparticles with graphitized carbon capsule layers are uniformly anchored on the N-doped carbon nanoplates. Benefiting from structural advantages and componential superiorities, the CoP@NPCP exhibits remarkable electrocatalytic activity and superior durability for both oxygen evolution reaction and hydrogen evolution reaction in the alkaline medium . The present synthetic strategy is very feasible for the design of the metallic phosphide nanoparticles encapsulated in N-doped porous carbon nanoplates.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2023
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IF 9.9
Jiabing Luo,Yan Zhou,Xingzhao Wang,Yufeng Gu,Wanli Liu,Shutao Wang,Jun Zhang
We report the synthesis and electrocatalytic properties of a CoMoO 4 -CoP heterostructure anchored on a hollow polyhedral N -doped carbon skeleton (CoMoO 4 -CoP/NC) for water-splitting applications. The preparation involved the anion exchange of MoO 4 2- to the organic ligand of ZIF-67, the self-hydrolysis of MoO 4 2- , and NaH 2 PO 2 phosphating annealing. CoMoO 4 was found to enhance thermal stability and prevent active site agglomeration during annealing, while the hollow structure of CoMoO 4 -CoP/NC provided a large specific surface area and high porosity that facilitated mass transport and charge transfer. The interfacial electron transfer from Co to Mo and P sites promoted the generation of electron-deficient Co sites and electron-enriched P sites, which accelerated water dissociation. CoMoO 4 -CoP/NC exhibited excellent electrocatalytic activity for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in 1.0 M KOH solution, with overpotentials of 122 mV and 280 mV at 10 mA cm −2 , respectively. The CoMoO 4 -CoP/NC‖CoMoO 4 -CoP/NC two-electrode system only required an overall water splitting (OWS) cell voltage of 1.62 V to achieve 10 mA cm −2 in an alkaline electrolytic cell. In addition, the material showed comparable activity to 20% Pt/C‖RuO 2 in a pure water home-made membrane electrode device, demonstrating potential for practical applications in proton exchange membrane (PEM) electrolyzers. Our results suggest that CoMoO 4 -CoP/NC is a promising electrocatalyst for efficient and cost-effective water splitting.
研究领域:
材料科学
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电化学
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催化
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能源材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
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2023
·Vol. 47
·期 15
·7305-7311
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IF 3.3
Jie Liu,Yu Chen,Yin Wang,Lu Liu,Qi Chen,Qingqing Shi,Luyi Huang,Xing Chen,Kun Xie
Cobalt phosphide has excellent electrical conductivity, metallic properties, and thermal stability. However, its application is limited due to the few active sites exposed in electrochemical reactions and poor structural stability. Herein, we adopt the strategies of material compounding and structural design to construct CoP@Ni(OH)2 bilayer nanosheets. The bilayer nanosheet structure can provide abundant transport paths for electrons and ions while also exposing more electroactive sites. In addition, the close contact and mutual support of the bilayer nanosheet structure can significantly alleviate material morphological collapse during charging/discharging processes, improving the cycle stability. The advantages of multiple components were combined in CoP@Ni(OH)2 to provide multiple valances for the faradaic redox reactions. The CoP@Ni(OH)2 manifested a specific capacity of 1697.8 C g−1 at 1 A g−1 and maintained a high rate capability of 35.0% even at 20 A g−1. Moreover, the electrode, had great cycling stability, retaining 83.9% of its capacity at 6 A g−1 after 7000 cycles. The asymmetric supercapacitor made of CoP@Ni(OH)2//activated carbon delivered 53.2 W h kg−1 at 800 W kg−1.
研究领域:
材料科学
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电化学
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）