Nanoscale
·
2023
·Vol. 15
·期 39
·16199-16208
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IF 6.7
Bianli Zhang,Xingyue Qian,Hui Xu,Lin Jiang,Jiawei Xia,Haiqun Chen,Guangyu He
The coordination of the electronic structure and charge transfer through heteroatomic doping and sulfur vacancies is one of the most vital strategies for enhancing the electrocatalytic performance of the oxygen and hydrogen evolution reactions (OER, HER) through water splitting. Se-doped CuCo2S4 nanosheets (CuCo2S3.68Se0.32) with abundant sulfur vacancies were synthesized via a simple hydrothermal method to achieve remarkably efficient electrocatalytic water splitting. Importantly, incorporating Se in three-dimensional nanosheet structures effectively fine-tunes the electronic structure, ensuring ample accessibility of active sites for swift charge carrier transfer and improved reaction kinetics. The optimized CuCo2S3.68Se0.32 offers substantially high electrocatalytic activity with overpotentials of 65 and 230 mV at the current density of 10 mA cm−2 for HER and OER, respectively, which is comparable to commercial catalysts. Combining Se-doping and rich sulfur vacancies facilitates fast charge transport, thus significantly boosting the electrocatalytic activity. Furthermore, utilizing CuCo2S3.68Se0.32 as both the cathode and anode, a two-electrode electrolyser exhibits remarkable performance. It achieves a low voltage of 1.52 V at 10 mA cm−2 and demonstrates exceptional durability over time. This study investigates the significance of doping and vacancies in enhancing electrocatalytic activity for water splitting.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Environmental Science-Nano
·
2021
·Vol. 8
·期 5
·1376-1388
·
IF 8.131
Zihan Kang,Enzhu Lin,Ni Qin,Jiang Wu,Baowei Yuan,Dinghua Bao
Piezocatalysis has emerged as a novel technique to make use of mechanical energy in dealing with organic pollutants in wastewater. In this work, ferroelectric Bi2WO6 (BWO) nanosheets with a characteristic layered crystal structure and in-plane polarization were investigated, with special interest in the influence of their crystal symmetry and oxygen vacancies on the piezocatalytic performance. The nanosheets were synthesized by a hydrothermal process along with thermal annealing at different temperatures and atmospheres. The crystal symmetry, grain size and oxygen vacancies of the crystals were characterized by XRD, SEM, XPS and Raman spectroscopy. The piezocatalytic properties were investigated by degrading Rhodamine B (RhB) solution under ultrasonic vibration. The free radicals generated by ultrasonic treatment were detected and characterized using the electron spin resonance (ESR) method. The essential role of hydroxyl radicals in the dye degradation process was demonstrated by controlled experiments with different scavenger additives. The results show that the crystalline size and oxygen vacancies affect the degree of orthorhombic distortion and formation of defect energy levels, respectively, which will further affect the distribution of piezoelectric potential and piezocatalytic activity. This work will enable us to understand the influence of oxygen vacancies and crystal symmetry on piezocatalysis more intuitively and design more efficient piezocatalysts via a heat treatment control strategy.
研究领域:
材料科学
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环境科学
✓ 已验证
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Z.Y. Cai,F.F. Lin,T. Wei,D.G. Fu,L.Z. Pei
Polypyrrole/graphene nanocomposites have been synthesized via a simple in-situ pyrrole polymerization process. The polypyrrole/graphene nanocomposites were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), highresolution TEM (HRTEM) and Fourier transform infrared spectroscopy (FTIR) spectra. The results show that the sphere-like polypyrrole particles with the size of less than 500 nm attach to the surface of the graphene nanosheet-shaped structures with the size of less than 10 μm. The polypyrrole/graphene nanocomposites modified glassy carbon electrode exhibits good electro-catalytic performance for formaldehyde in neutral solution. The nanocomposites modified glassy carbon electrode shows an irreversible current peak located at +0.2 V. The detection limit and linear detection range are 0.028 μM and 0.001-2 mM. The polypyrrole/graphene nanocomposites reveal great potential to detect formaldehyde in liquid environment.
研究领域:
材料科学
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环境科学
·
分析化学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Chengcheng Pan,Zhicheng Liu,Minghua Huang
Recently, metal–organic framework (MOF) manifests an outstanding oxygen evolution reaction (OER) catalytic activity due to its structural diversity, highly ordered pore structure and abundant active sites. Herein, through a facile one-step solvothermal method, iron-doped nickel MOF nanosheets in situ grown on conductive nickel foam (Fe-Ni MOF NSs/NF) were conveniently fabricated as efficient OER catalyst, using only one kind of metal salt precursor. The ultrathin 2-dimensional sheet structure possesses highly exposed surface area and numerous metal sites which are beneficial to electrocatalytic OER performance. The Fe-Ni MOF NSs/NF presents superior OER activity in 1 M KOH, requiring overpotentials of 258 and 270 mV to deliver the current density of 50 and 100 mA cm −2 , along with a low Tafel slope of 40.8 mV dec −1 . Moreover, the durability of the Fe-Ni MOF NSs/NF catalyst is also outstanding, exhibiting only minor chronoamperometric decay after 24 h continuous operation at 50 mA cm −2 . The excellent OER activity could be ascribed to the coupling effects of ultrathin-nanosheet structure, favorable charge transfer kinetics, high conductivity and excellent intrinsic catalytic activity. This facile and economical strategy might be advantageous to prepare other high-performance MOF-based OER catalysts.
研究领域:
材料科学
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电化学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2020
·
IF 4.939
Wenzhu Tang,Gaowei Zhang,Yejun Qiu
Developing catalysts based on transition metal-based materials for oxygen evolution reaction (OER), which are cheap and efficient, is one of the keys to increase the rate of electrolysis of water to produce hydrogen . Herein, we successfully synthesize iron hydr(oxy)oxide nano-arrays on carbon cloth (FeOOH@CC), and then metallic nickel is electrodeposited on its surface to fabricate FeOOH/Ni heterojunction nanoarrays. Notably, the optimal FeOOH/Ni heterojunction nanoarrays catalyst shows high electrocatalytic performance toward OER with a small overpotential of 257.8 mV at 50 mA cm −2 , a Tafel slope of 30.8 mV dec −1 and outstanding long-term stability in alkaline media . The superior OER performance could be ascribed to the introducing of metallic nickel. The nickel in-situ grows on the surface of FeOOH, which not only can improve the conductivity of FeOOH, but also cooperate with FeOOH to form the FeOOH/Ni heterogeneous interfaces for further enhancing OER electrocatalytic activities . This work provides a simple and efficient strategy of interface engineering to fabricate oxyhydroxide/metal heterojunction nanoarrays as high-efficiency OER catalysts.
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
MATERIALS LETTERS
·
2017
·
IF 2.572
Jingchao Zhang,Chunying Xu,Renchun Zhang,Xueying Guo,Jie Wang,Xinghui Zhang,Daojun Zhang,Baiqing Yuan
CoWO 4 microrings assembled by nanorods were synthesized by a simple solvothermal method. The morphology and structure of the as-prepared unique CoWO 4 microrings were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), and high-resolution TEM (HRTEM). The as-prepared CoWO 4 sample with abundant active sites demonstrated good catalytic activity for glucose electrooxidation in alkaline solution. CoWO 4 modified glass carbon electrode (CoWO 4 -GCE) exhibited good electro-catalytic performance towards glucose detection, it offered a wider linear range, a low detection limit of 0.27 μM, high selectivity, and long-term operational stability. The results showed the as-prepared CoWO 4 microrings can be utilized to construct an enzyme-free glucose sensor based on GCE.
研究领域:
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
POLYHEDRON
·
2019
·
IF 2.284
Lihong Qian,Yuqing Miao
The nanosheets of Co/Zn phosphate were deposited on nickel foam with the organized flower-like structure through a facile one-pot hydrothermal method. The resulted Co-Zn-P/NiFoam exhibits excellent electrocatalytic performance of oxygen evolution in basic solution and hydrogen evolution in acid solution with low onset potentials, high current responses, low Tafel slopes and good long-term stabilities. The nanosheet organized flower-like structure may contribute to the more active sites for target molecules, the higher efficiency for mass migration and electron transfer. The compact layer of Co/Zn phosphate may play a great role in its electrocatalytic stability for both OER in basic solution and HER in acid solution. This work offers a facile strategy to fabricate inexpensive and efficient electrocatalysts towards water splitting for possible applications in the future.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CATALYSIS LETTERS
·
2019
·Vol. 149
·期 5
·1368-1374
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IF 2.372
Li Pengcheng,Wu Dengfeng,Dai Changqing,Huang Xingkai,Li Chao,Yin Zhen,Zhou Song,Lv Zhengang,Cheng Daojian,Zhu Jiqin,Xu Jian,Liu Xi
As a promising alternative to precious metal catalysts, Molybdenum carbide (MoC) still cannot compete with commercial Pt catalysts in many aspects. In the present work, we develop a simple carburization method to synthesize synergistic MoC catalysts with highly dispersed copper. Addition of copper could effectively induce formation of α-phase of MoC and markedly improve electrochemical activity for HER reaction. When the doping ratio of Cu–Mo reaches 10:90, the Cu doped MoC displays the best catalytic performance, even compared with the commercial Pt/C catalyst. The enhanced HER activity for Cu–MoxCy can be attributed to the formation of active phase and also synergistic surface. Graphical Abstract
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2014
·Vol. 3
·期 4
·1656-1665
·
IF 0
Yuan Pan,Yanru Liu,Jinchong Zhao,Kang Yang,Jilei Liang,Dandan Liu,Wenhui Hu,Dapeng Liu,Yunqi Liu,Chenguang Liu
Monodispersed nickel phosphide nanocrystals (NCs) with different phases (Ni12P5, Ni2P and Ni5P4) were synthesized via the thermal decomposition approach using nickel acetylacetonate as the nickel source, trioctylphosphine as the phosphorus source and oleylamine in 1-octadecene as the reductant. The phases of the as-synthesized nickel phosphide NCs could easily be controlled by changing the P : Ni precursor ratio. The structure and morphology of the as-synthesized nickel phosphide NCs were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), energy dispersive X-ray analysis (EDX), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FT-IR) and N2 adsorption–desorption. A formation mechanism for the as-synthesized nickel phosphide NCs was proposed. We further studied the influence of the phase of the nickel phosphide NCs on the electrocatalytic properties for the hydrogen evolution reaction (HER). All phases showed good catalytic properties, and the Ni5P4 NCs with a solid structure exhibited higher catalytic activity than the Ni12P5 and Ni2P NCs. This superior catalytic activity is attributed to the higher positive charge of Ni and a stronger ensemble effect of P in Ni5P4 NCs. This study demonstrates that the crystalline phase is important for affecting the electrocatalytic properties.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION
·
2018
·Vol. 35
·期 5
·1700379
·
IF 4.384
Xiaotong Li,Junshu Zhang,Shufang Kou,Xianfeng Yang,Xia Guo,Jian Yang
Pt/Co and Au are organized into well-defined nanostructures by a simple and mild method, such as dumbbell-like nanorods and core–shell nanorods. The resultant dumbbell-like nanorods show a superior performance in the electrooxidation of formic acid, as compared with core–shell nanorods, Pt-tipped gold nanorods, and commercial Pt/C. This result can be attributed to electronic effect between Au and Pt, heteroatom effect of Co, irregular surface at the tips, and the interface effect.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2016
·
IF 3.014
Xiaomeng Li,Ming Wen,Dandan Wu,Qingsheng Wu,Jiaqi Li
For the exploration of catalysts with excellent performance in alkaline fuel cells, high-performance two-dimensional (2D) Pd-on-NiCu nanosheets were synthesized through the kinetics controlling synthesis of NiCu nanosheets followed by Pd nanoparticles (NPs) embedding treatment at room temperature. In which case, well-dispersed Pd NPs with the average diameter of ∼4 nm are embedded on NiCu nanosheets (BET surface area of 180.7 m 2 g −1 ). Pd-on-NiCu nanosheets exert remarkable high performance in electrocatalytic activity, methanol-tolerance and stability, the electrocatalytic mass activity of Pd-on-NiCu nanosheets is 1827 mAmg −1 , which is over 6-fold higher than that of commercial Pd/C (289 mAmg −1 ), and the current density of the electrocatalyst decreases after 300 cycles of only 6%. Therefore, Pd-on-NiCu nanosheets can be considered as one of the most promising candidates for fuel cells applications.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2022
·
IF 12.92
Tingting Jiang,Weiwei Xie,Shipeng Geng,Ruchun Li,Shuqin Song,Yi Wang
Oxygen evolution reaction (OER) is the dominant step for plenty of energy conversion and storage technologies. However, the OER suffers from sluggish kinetics and high overpotential due to its complex 4-electron/proton transfer mechanism. Thus, developing efficient electrocatalysts is particularly urgent to accelerate OER catalysis but still remains a great challenge. Herein, we have synthesized the novel cobalt molybdate nanoflakes (CoMoO 4 -O v - n @GF) with adjustable oxygen vacancies contents by in situ constructing CoMoO 4 nanoflakes on graphite felt (GF) and annealing treatment under the reduction atmosphere. The best-performing CoMoO 4 -O v -2@GF with optimal oxygen vacancies content shows splendid electrocatalytic performance with the low overpotential (296 mV at 10 mA cm −2 ) and also small Tafel slope (62.4 mV dec −1 ) in alkaline solution, which are comparable to those of the RuO 2 @GF. The experimental and the density functional theory calculations results reveal that the construction of optimal oxygen vacancies in CoMoO 4 can expose more active sites, narrow the band-gap to increase the electrical conductivity, and modulate the free energy of the OER-related intermediates to accelerate OER kinetics, thus improving its intrinsic activity.
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
危险品化学品经营许可证（带存储）