Batteries-Basel
·
2023
·Vol. 9
·期 6
·326
·
IF 4
Congcong Lu,Chengyu Tu,Yu Yang,Yunping Ma,Maiyong Zhu
Considering their high abundance in the earth, iron-based materials have occasionally been regarded as promising electrode materials for supercapacitors. However, monometallic iron-based electrodes still demonstrate an insufficient specific capacitance value in comparison to monometallic Mn-, Ni-, and Co-based compounds and their combined materials. Herein, an enhanced iron-based heterostructure of Fe3O4@Fe2P was prepared via the in situ phosphorization of Fe3O4. Compared to pristine Fe3O4, the Fe3O4@Fe2P heterostructure showed a capacity enhancement in KOH aqueous solution. The improved electrochemical performance can be attributed to both the core shell structure, which favors buffering the collapse of the electrode, and the synergistic effect between the two iron compounds, which may provide abundant interfaces and additional electrochemically active sites. Moreover, the assembled asymmetric supercapacitor device using the Fe3O4@Fe2P heterostructure as the positive electrode and activated carbon as the negative electrode delivers a high energy density of 13.47 Wh kg−1, a high power density of 424.98 W kg−1, and an acceptable capacitance retention of 78.5% after 5000 cycles. These results clarify that monometallic Fe based materials can deliver a potential practical application. In addition, the construction method for the heterostructure developed here, in which different anion species are combined, may represent a promising strategy for designing high-performance electrodes.Keywords:Fe3O4;Fe2P;supercapacitor
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Xiangli Shi,Pengfei An,Qiong Zhang,Qi Song,Deli Jiang,Dan Tian,Di Li
Photocatalytic CO 2 conversion into value-added chemicals is a promising strategy to remedy the energy crisis and environmental pollution, yet developing cost-effective photocatalysts that can efficiently and selectively convert CO 2 to desirable products is still a great challenge. Herein, we construct a Fe 2 P nanoparticles decorated on the surface of the nitrogen vacancies (NVs) modified g-C 3 N 4 nanosheet hybrid photocatalyst (Fe 2 P/NVsCN) for photocatalytic conversion of CO 2 to CO. The NVs can significantly improve the visible light absorption due to the formation of midgap state, and the metallic Fe 2 P as the cocatalyst is beneficial to promote the photo-generated charge separation and migration, impede the side reaction, in which improve the activity and selectivity. By adjusting the contents of Fe 2 P and NVsCN, the optimal 20%-Fe 2 P/NVsCN(1:5) sample shows an excellent CO evolution rate in visible light of 22.48 µmol g -1 h −1 with 97.5% selectivity, which is superior to most reported g-C 3 N 4 -based photocatalysts. Furthermore, this photocatalyst also exhibits good stability due to the timely consumption of electrons, and it maintains stable CO evolution rate over 20 h. This work opens a new horizon for design and construction of active photocatalyst with high selectivity by synergistic modulating the surface vacancy and cocatalyst.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Catalysis Science & Technology
·
2020
·Vol. 10
·期 9
·3015-3023
·
IF 5.721
Shuyuan Wang,Dan Xu,Yunlei Chen,Song Zhou,Di Zhu,Xiaodong Wen,Yong Yang,Yongwang Li
Developing economically viable and highly selective hydrodeoxygenation (HDO) catalysts for the C–O bond cleavage of lignin-derived aryl ethers is very important, but still challenging. Herein, a novel monometallic Fe2P catalyst was synthesized by a two-stage phosphorization method under mild conditions, which showed a high arene (benzene) selectivity of 96.7% among C6+ products with a turnover frequency of 8.2 × 10−3 mol molCO−1 s−1 in the HDO of anisole at 200 °C and ambient hydrogen pressure. Characterization results revealed that the crystal structure of the Fe2P catalyst was stable and no phosphorus loss occurred in the reduction and reaction process. The kinetic results indicated that the coverage of anisole was higher than that of H2 on the Fe2P catalyst. The anisole temperature-programmed surface reaction (anisole-TPSR) and density functional theory (DFT) calculation results identified that the anisole HDO reaction mechanism is the direct cleavage of the Caryl–O bond of anisole to form and CH3O* without forming the C6H5–OH–CH3 intermediate. These findings may contribute toward understanding the iron-based phosphide and guiding the catalyst design for the HDO of aryl ethers and related reactions.
研究领域:
化学工程
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2018
·
IF 4.229
Kewei Wang,Jinshan Tan,Zejia Lu,Shuai Chen,Xilin She,Huawei Zhang,Dongjiang Yang
The preparation of hydrogen evolution reaction (HER) electrocatalyst with high catalytic performance is a huge challenge. In this work, we develop a MoP/Fe 2 P/RGO composite as a electrocatalyst for HER. The MoP/Fe 2 P/RGO exhibits excellent electrocatalytic performance with a Tafel slope and an onset overpotential of 51 mV/dec and 105 mV, respectively. To drive 10 mA/cm 2 , it only requires a small over-potential of 156 mV. The high electrocatalytic HER activity is mainly due to the synergistic effect of MoP and Fe 2 P. In addition, the introduction of RGO not only prevents particle aggregation and coalescence during high temperature phosphating, but also improves the conductivity of the catalyst.
研究领域:
材料科学
·
电化学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2021
·Vol. 13
·期 42
·17920-17928
·
IF 7.79
Liangliang Feng,Xiao Zhang,Jianfeng Huang,Danyang He,Xiaoyi Li,Qianqian Liu,Yongqiang Feng,Guodong Li,Guanghui Xu,Liyun Cao
The development of cost-effective, high-efficiency bifunctional electrocatalysts as alternatives to the state-of-the-art Pt-based materials toward the hydrogen evolution reaction (HER) and oxygen reduction reaction (ORR) is of great significance but still challenging. Herein, an advanced bifunctional electrocatalyst is presented, composed of Fe2P encapsulated in carbon nanowalls decorated with well-dispersed Fe3C nanodots (denoted as Fe2P@Fe3C/CNTs), which is achieved by a novel “inside-out” gas–solid reaction protocol. When functioning as a cathodic catalyst for water splitting, the Fe2P@Fe3C/CNT catalyst needs an ultralow overpotential of 83 mV to deliver a current density of 10 mA cm−2, shows a small Tafel slope of 53 mV dec−1 and ensures long-term stability for over 200 h in an alkaline electrolyte. Notably, the Fe2P@Fe3C/CNT catalyst exhibits an extremely impressive ORR performance with an onset potential (Eonset) of 1.060 V and a half-wave potential (E1/2) of 0.930 V, excellent stability (≈94% activity retention after 36 000 s), and a strong methanol resistance ability, even far outperforming commercial Pt/C (Eonset = 0.955 V, E1/2 = 0.825 V, ≈75% activity retention after less than 3500 s). Such outstanding HER and ORR performances are mainly ascribed to the improved corrosion resistance of the unique Fe2P@C core–shell structures, the abundant catalytically active sites of ultrasmall Fe3C nanodots incorporated in carbon nanowalls, and the good electrical conductivity of 2D graphitic carbon nanotubes used as a support.
研究领域:
材料科学
·
电化学
·
催化
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2022
·Vol. 169
·期 6
·066509
·
IF 4.386
Ruixiang Wang,Yuanliang Yuan,Xiaocong Zhong,Yirui Zhu,Jiaming Liu,Yongmin Xie,Shuiping Zhong,Zhifeng Xu
Incorporating metal compound nanoparticles in carbonaceous matrix is a valid strategy to fabricate highly efficient oxygen reduction electrocatalysts. Herein, N, P-codoped carbon nanotubes embedded with Fe2P nanoparticles (Fe2P/NPCt) were synthesized in this work. Results show carbon nanotubes have a large specific surface area (987 m2 g−1) with an inner diameter of ∼60 nm. About 5.90 wt% nitrogen (35.18% pyridinic N) and 2.56 wt% phosphorus (mainly in the form of P–C and P–Fe) was doped in Fe2P/NPCt. HRTEM and XRD results confirmed the well dispersed Fe2P nanoparticles in 5 ∼10 nm on carbon nanotubes. The electrochemical performance of Fe2P/NPCt was evaluated in 0.10 M KOH using cyclic voltammetry, linear scanning voltammetry, and chronoamperometry. Fe2P/NPCt exhibits high electrocatalytic activity towards oxygen reduction with an onset potential of 1.029 V (vs RHE) and a limited current density of 6.79 mA cm−2, surpassing those of 20% Pt/C (0.950 V and 5.20 mA cm−2). Furthermore, Fe2P/NPCt presents outstanding durability and good methanol tolerance during long-term ORR. When assembled in a primary zinc-air battery (ZAB), the maximum power density and specific capacity of ZAB reach 175.48 mW cm−2 and 744.1 mAh g−1, respectively, outperforming ZAB equipped with 20% Pt/C.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2021
·
IF 9.127
Ruixiang Wang,Yuanliang Yuan,Jianbo Zhang,Xiaocong Zhong,Jiaming Liu,Yongmin Xie,Shuiping Zhong,Zhifeng Xu
Transition metal phosphide/carbon composites are promising electrocatalysts for oxygen reduction reaction (ORR). Herein, we propose a facile process to fabricate a bayberry-like N, P-enriched carbon nanospheres embedded with Fe 2 P nanocrystals (Fe 2 P/NPCs). Bayberry-like polyaniline nanospheres (PANI-NS) are firstly synthesized through microemulsion template method . Then, Fe is incorporated in PANI-NS during the hydrothermal treatment . Lastly Fe x P nanocrystals and N, P-enriched carbonaceous carriers are obtained by pyrolyzing the hydrothermal-treated PANI-NS. The resultant Fe x P/NPCs exhibit a uniform particle size (~250 nm), a large specific surface area (523 m 2 g −1 ) and a homogeneous mesoporous structure (~3.46 nm). The phase structure of Fe x P depends on the Fe/P (molar ratio) during hydrothermal treatment. When Fe/P is around 0.2, a preferable Fe 2 P phase is obtained. The Fe 2 P/NPCs exhibit outstanding ORR electrocatalytic activity with a half-wave potential of 0.820 V (vs. RHE) and a diffusion-limited current density of 5.58 mA cm −2 , comparable with commercial Pt/C. Moreover, Fe 2 P/NPCs possess a good duration stability and higher methanol tolerance than commercial Pt/C. When assembled in zinc-air batteries, Fe 2 P/NPCs contribute to an open circuit voltage of 1.449 V, a maximum power density of 128.38 mW cm −2 , and a specific capacity of 691.0 mAh g −1 , superior to the commercial Pt/C-based zinc-air battery.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROANALYSIS
·
2020
·Vol. 33
·期 3
·831-837
·
IF 2.544
Haiyan Zhang,Yaqing Zhang,Sen Liu
The determination of hydrogen peroxide (H 2 O 2 ) based on electrochemical sensors is highly attractive in the fields of environmental monitoring and biosensing, however development of non-precious metal-based electrocatalysts with high performances remains challenging. Here, a new non-enzymatic H 2 O 2 sensor has been reported by using Fe 2 P modified N,P co-doped carbon (Fe 2 P/NP-C) materials as sensing materials. Fe 2 P/NP-C materials were synthesized by pyrolysis of polydopamine coating Fe-based coordination polymer nanoparticles, which were obtained by direct mixing FeCl 3 and sodium hexametaphosphate at room temperature. The electrochemical tests display that Fe 2 P/NP-C-based non-enzymatic H 2 O 2 sensor exhibited detection limit of 60 μM and linear range from 0.1 mM to 1 mM, respectively. This work presents a new avenue to design of non-precious metal-based electrocatalysts for chemical sensing and biosensing applications.
研究领域:
环境监测
·
生物传感
·
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CARBON
·
2019
·
IF 7.466
Lulu Chen,Yelong Zhang,Lile Dong,Xiangjian Liu,Ling Long,Siyu Wang,Changyu Liu,Shaojun Dong,Jianbo Jia
Fabrication of transition metal phosphides/carbon hybrids as electrocatalysts for oxygen reduction reaction (ORR) has great significance for developing clean energy conversion and storage devices based on earth abundant elements. In this work, we prepared 3D N,P-codoped porous carbon supported with ultrasmall Fe 2 P nanoparticles (Fe 2 P/NPC) as high-efficient ORR catalyst by a simple grinding-calcination strategy. As the pore-forming agent, ZnO nanospheres can be in-situ eliminated and generate abundant porous structures which are beneficial to mass transfer. Meanwhile, the large BET surface area (1288 m 2 g −1 ) and pore volume (1.23 cm 3 g −1 ) of Fe 2 P/NPC can provide more contact active centres for ORR. In alkaline solution, Fe 2 P/NPC performs excellent ORR activity with the positive onset potential (0.997 V) and half-wave potential (0.872 V), which are more positive than those of the commercial Pt/C (0.977 and 0.812 V). In addition, Fe 2 P/NPC can be used as air cathode catalyst in a Zn-air battery whose open circuit voltage (1.469 V) is larger than that of the commercial Pt/C (1.332 V) based one. This work provides new strategy to prepare transition metal phosphides/carbon hybrids for electrocatalysis and clean energy conversion systems.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Yuxiao Gong,Lian-Hua Xu,Xue-Ji Zhang,Serge Cosnier,Dan Shan
In energy conversion issues, to boost the hydrogen evolution reaction (HER), rational design and synthesis of earth-abundant transition metal phosphides-based materials as efficient electrocatalysts are of great significance. In this work, we report a facile, green and secure approach to synthesize the Fe 2 P/N doped carbon-based hollow nanoshuttles, denoted herein as NH 2 MIL-PA-900, with enhanced HER performances. The highly porous NH 2 MIL and phytic acid (PA) were carefully selected as the self-sacrificed template and etching agent to construct the hollow structure, respectively. Moreover, the in situ coordinated biocompatible PA with Fe 3+ can also be used as the phosphorus source for the metal phosphating during the subsequent high-temperature carbonization process at 900 °C. NH 2 MIL-PA-900 possesses a hollow shuttle-like nanostructure with highly dispersed Fe 2 P nanoparticles on the shell. When used as an electrocatalyst for HER, NH 2 MIL-PA-900 exhibits a low overpotential (157 mV at 10 mA cm −2 ) and a small Tafel slope (76 mV dec −1 ).
研究领域:
材料科学
·
电化学
·
能源转换
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2024
·
IF 20.2
Enze Zhu,Chaoyang Shi,Jie Yu,Haodong Jin,Linxiang Zhou,Xikun Yang,Mingli Xu
Single-atom catalysts have been extensively researched in electrocatalytic oxygen reduction and evolution reactions (ORR/OER) due to their tunable coordination environment. However, the linear scaling relationship (LSR) of oxygen intermediate adsorption energies imposes limitations in simultaneously enhancing ORR/OER. Herein, a unique asymmetrically coordinated FeN 3 P 1 single-atom configuration coupled by Fe 2 P nanoparticle is synthesized via a prefabricated Fe-N/P coordination strategy. The accentuated structural distortion induced by Fe 2 P can effectively break the LSR, lowering the energy barriers for ORR/OER. Kinetically, a modulation of OH − concentration by Fe 2 P on the catalytic interface was identified by finite element simulation and molecular dynamics simulation, which can positively facilitate ORR/OER kinetics. The obtained Fe 2 P@FeN 3 P 1 -NC catalyst exhibits excellent bifunctional ORR/OER (∆E = 0.65 V) and a promising application in zinc-air battery. This work provides a valuable insight into simultaneous regulation of thermodynamic and kinetic behavior by tailored structure distortion and enriched surface ions for ORR/OER.
研究领域:
材料科学
·
电化学
·
催化
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2024
·
IF 3.1
Yu Yan,Dongxiao Li,Zhimin Guo,Hao Ren,Yubiao Huang,Bei Yan,Ruihuan Zhao,Xin Yao
Developing efficient, low-price non-noble metal-based electrocatalysts for overall water splitting in alkaline medium remains a formidable challenge. In our work, Cr-doped CoP/Fe2P (Cr-CoP/Fe2P) flower-like microsphere was synthesized through a simple hydrothermal and phosphating process. The resulting Cr-CoP/Fe2P electrocatalyst shows significantly enhanced oxygen evolution reaction performance (262 mV @ 10 mA cm-2) and has a satisfactory hydrogen evolution reaction performance (114 mV @ 10 mA cm-2), coupled with favorable stability in an alkaline medium. Furthermore, when assembling Cr-CoP/Fe2P into an electrolytic cell, the two-electrode system can provide a current density of 10 mA cm-2 at a voltage of 1.61 V. At high current density, the performance of the electrolytic cell composed of Cr-CoP/Fe2P is superior to that of noble metal catalyst electrode pair. Electronic structure analysis and various characterizations confirm that Cr doping and the formation of CoP/Fe2P heterogeneous interfaces redistribute the electron densities of the active sites, enlarge the specific surface area, and enhance the aerophobicity of the catalysts, thereby improving the electrocatalytic property. This work provides a referable method for engineering highly efficient and stable non-noble polymetallic phosphides, which serve as bifunctional electrocatalyst for overall water splitting.
研究领域:
材料科学
·
电化学
·
催化
·
能源材料
✓ 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）