ELECTROCHIMICA ACTA
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2018
·
IF 5.116
Hao Yang,Fusheng Li,Xiujuan Wu,Peili Zhang,Wenlong Li,Suyan Cao,Yu Shan,Licheng Sun
The electrochemical splitting of water requires efficient functional electrodes. Herein, we report the fabrication of electrocatalyst consisted of an electrodeposited NiFeP alloy film which was composite plated with nano-SiO 2 on nickel foam. The structure and morphology of the film were characterized by X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results showed that the surface area of this NiFeP -SiO 2 co-deposition alloy film can be significantly increased after electrochemical etching in a KOH solution. The water splitting properties of the alloy film were evaluated using electrochemistry . By using the NiFeP -SiO 2 / NF (Etched) as a bifunctional electrode, total water splitting has been demonstrated in a two-electrode cell with a current density of 10 mA cm −2 at an applied voltage of 1.57 V, which exhibited enhanced water splitting activity in comparison to the analogue cell using the pristine NiFeP / NF electrode.
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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产品关联
DOI
高影响因子
ChemCatChem
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2018
·Vol. 10
·期 23
·5533-5540
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IF 4.674
Xiaoqiang Du,Jianpeng Fu,Xiaoshuang Zhang
Graphical Foaming at the mouth of the catalyst : NiCo 2 O 4 @NiMoO 4 core−shell hybrid nanostructure was successfully prepared by hydrothermal calcination method. The nanostructure is a low cost and relatively stable electrocatalytic water splitting catalyst. The NiCo 2 O 4 @NiMoO 4 /NF-8 h nanorod electrode shows excellent electrocatalytic activity with a low voltage 1.55 V and stability with long hour electrolysis, which is highly satisfactory for a prospective bifunctional electrocatalyst. Splitting water to make hydrogen is one of the most effective ways to solve the energy crisis. In this paper, we started with the catalysts of the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) of electrocatalytic water splitting, studied the catalysts with great stability and practicality, and designed NiCo 2 O 4 nanowires as precursors, on whose surface we set NiMoO 4 nanosheets. Cobalt elements were introduced on the nickel foam with electrocatalytic properties, and a flower-like NiCo 2 O 4 @NiMoO 4 core-shell hybrid nanostructure was prepared by a hydrothermal method. The series of core-shell nanocatalysts were characterized via XRD, SEM, XPS, etc. The electrochemical properties of the obtained catalysts were also measured, and the conclusion that the catalysts could reduce the overpotential of the reaction required was figured out. The conclusion of the overpotential of catalyzing the water splitting reaction provides new ideas for the research of the catalyst for electrocatalytic water splitting reaction.
研究领域:
材料科学
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电化学
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DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
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IF 8.3
Shuting Min,Chenxuanzi Wang,Mingxuan Zhong,Yibo Guo,Bo Xiao,Tingting Xu,Xun Wang
In this study, a series of composite oxygen carriers (OCs) of NiFe 2 O 4 /Sr 4 Fe 6 O 13 (xNiySr 4 ) was synthesized by solid-phase synthesis method. The performance evaluation for syngas and hydrogen production was investigated in chemical looping reforming coupled with thermochemical water splitting using ethanol as fuel. The presence of NiFe 2 O 4 enhanced the lattice oxygen activity and intensified the reduction of Sr 4 Fe 6 O 13 . The Ni–Fe alloy was produced in fuel reactor (FR) and then promoted water splitting in steam reactor (SR) for hydrogen production. The presence of Sr 4 Fe 6 O 13 regulated the reactivity of NiFe 2 O 4 , which prevented the ethanol complete oxidation in FR and enhanced the syngas production. Additionally, the introduction of Sr 4 Fe 6 O 13 decreased the content of NiFe 2 O 4 and suppressed carbon deposition, which resulted in a high purity of hydrogen in SR. Moreover, the existence of Sr 4 Fe 6 O 13 mitigated the sintering of NiFe 2 O 4 . The composite oxygen carrier of NiFe 2 O 4 /Sr 4 Fe 6 O 13 exhibited better cyclic stability than the single NiFe 2 O 4 and Sr 4 Fe 6 O 13 oxygen carrier. The 0.4NiFe 2 O 4 /0.6Sr 4 Fe 6 O 13 oxygen carrier, termed as 4Ni6Sr 4 , exhibited a good performance for syngas and hydrogen production performance at 800 °C. A high syngas purity of 74.36% was observed with a yield of 1.05 Nm³/kg ethanol in FR. The hydrogen yield and purity in SR were 6.51 mmol/g OC and 96.60%, respectively.
研究领域:
能源科学
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材料科学
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产品关联
DOI
高影响因子
ACS Applied Energy Materials
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2024
·
IF 5.4
Xinyang Fu,Yixin Qi,Yanan Zhao,Weibing Li,Yaping Zhang
The significant carrier recombination occurring in the bulk of BiVO4 is a primary factor limiting the enhancement of its photoelectrochemical performance. To address this issue, we have incorporated two-dimensional (2D) nanosheet morphology Bi:ZnIn2S4 and Co sites onto the surface of BiVO4 to create an effective composite photoanode. According to the ultraviolet-visible diffuse reflectance spectroscopy and ultraviolet photoelectron spectroscopy results, it was inferred that a Z-scheme transfer path of charges was formed between BiVO4 and Bi:ZnIn2S4, which promoted the separation of bulk phase carriers. Additionally, the 2D topography of Bi:ZnIn2S4 also shortens the transmission distance of the carriers. Furthermore, the presence of Co sites provides more active sites for the surface hydrolysis reaction to proceed. Ultimately, under AM1.5G illumination, the photocurrent density of the BiVO4/Bi:ZnIn2S4-Co photoanode reaches 3.6 mA cm–2 at 1.23 V vs reversible hydrogen electrodes.
研究领域:
材料科学
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能源科学
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
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2024
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IF 6.3
Jing Peng,Yucheng Wu,Ning Long,Wei Shen,Yimin Jiang,Rongxing He,Ming Li
Designing efficient non-precious-metal bifunctional electrocatalysts is still challenging at present. Herein, the efficient Ce,F-Ni 2 P/CoP electrocatalyst for water splitting was successfully fabricated. As shown from the present investigation, the codoping of Ce and F in Ni 2 P/CoP induced the f-p-d gradient orbital coupling in the Ce-F-metal structural unit of the catalyst, significantly reducing the work function of the catalyst, which accelerated the reaction kinetics and improved the intrinsic catalytic activity. The catalyst exhibited the outstanding hydrogen evolution reaction (HER) activity in the full pH range and, especially in alkaline electrolyte, an ultra-low oxygen evolution reaction (OER) overpotential of 243 mV at 50 mA·cm −2 and an excellent HER overpotential of 88 mV at 10 mA·cm −2 were achieved. Moreover, Ce,F-Ni 2 P/CoP displayed an excellent overall water splitting (OWS) performance with η 10 = 1.52 V. DFT theoretical calculations also showed that the gradient orbital coupling resulted in the reduction of the work function of the catalyst. Our work provides a new understanding of designing and constructing high-performance catalysts.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 40
·23188-23198
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IF 12.732
Xupo Liu,Xuyun Guo,Mingxing Gong,Tonghui Zhao,Jian Zhang,Ye Zhu,Deli Wang
Exploring cost-effective electrodes operating at a high current density above 400 mA cm−2 is still challenging for the industrial application of water splitting. Herein, the corrosion layers of iron foam are tailored towards preparing self-supporting electrodes for the oxygen evolution reaction (OER). Corrosion reactants (Ni2+, O2 and H2O) are adopted to regulate the structures and electrochemical performances of electrodes on account of the diverse iron corrosion behaviors. By further comparing the spontaneous iron corrosion in ZnCl2, CoCl2, NiCl2 and FeCl3 solutions, it is identified that the appropriate electrode potentials of Ni/Ni2+ and Co/Co2+ are favourable for achieving uniformly ordered corrosion layers owing to the simultaneously occurring oxygen corrosion and replacement reaction. The as-prepared electrode exhibits excellent OER performances of affording low overpotentials of 221 and 291 mV to reach 100 and 500 mA cm−2, respectively, as well as steadily operating at 500 mA cm−2 for 100 h. Integrating with a prominent hydrogen evolution reaction (HER) catalyst, an industrially required current density of 500 mA cm−2 has been obtained at 1.81 V. Importantly, a large-area electrode (8 × 8 cm2) has been successfully prepared. This work establishes potential possibilities for designing inexpensive and efficient electrocatalysts through regulated metal corrosion.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
Sustainable Energy & Fuels
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2022
·Vol. 6
·期 12
·3008-3013
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IF 6.813
Hui Han,Yanling Qiu,Hui Zhang,Tianyi Bi,Qian Yang,Mengyao Liu,Jian Zhou,Xuqiang Ji
The structural symmetry breaking of a highly crystalline substance towards a chaotic non-crystal phase construction, particularly involving a self-healing process after crystalline grain destruction, is beset by difficulties and is critical for high-performance water splitting. Taking CO32−-intercalated carbonate hydroxides as initial high-crystallinity crystals, controllable interfacial structure destruction was designed on the basis of surface-wetting invasion from Fe relevant Lewis-acidic metal salts. A spontaneous self-treatment course occurs via the in situ formation of an ultrathin lattice-disordered layer (∼7.5 nm in thickness) due to the interfacial hydrolysis of the escaped CO32− encountering positive-valence iron ions. As-obtained NiCoCH@Fe–OH, with Co(CO3)0.5(OH)·0.11H2O@Ni2(OH)2CO3 (NiCoCH) as the core and amorphous Fe(OH)3 as the shell, shows excellent catalytic performance toward water splitting, with a current density of 50 mA cm−2 at overpotentials of 221 mV for the oxygen evolution reaction and 233.8 mV for the hydrogen evolution reaction in 1.0 M KOH. Assembling a two-electrode alkaline electrolytic cell, only 1.69 V is required to drive a current density of 50 mA cm−2. This work merges structural destruction and in situ regeneration into a one-material system through a single-step surface-wetting strategy for precise surficial nanostructure design, and it displays a mild/scalable approach for high-activity catalyst development.
研究领域:
材料科学
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化学工程
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能源研究
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产品关联
DOI
高影响因子
ACS Applied Energy Materials
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2021
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IF 6.024
Yangqin Gao,Zhijie Tian,Hongying Zhu,Huaqing Xue,Lianzheng Ma,Yanjie Dai,Wenyue Zhao,Xuli Li,Ning Li,Lei Ge
Amorphous NiFeMo oxides (a-NiFeMo) synthesized via a simple supersaturated coprecipitation method are explored as a cocatalyst to improve the photoelectrochemical water splitting performance of BiVO4. The performance of the composite photoelectrode is found to be further enhanced through a cyclic-voltammetry-related in situ activation process, and a photocurrent of 5.0 mA/cm2 is achieved at 1.23 VRHE with improved photoelectrochemical stability. X-ray photoelectron spectroscopy (XPS), Raman, and electron spin resonance (ESR) characterization results indicate that the surface-loaded a-NiFeMo cocatalyst undergoes a rapid surface reconstruction during the in situ activation process, which results in an incorporation of phosphate ions in the surface-loaded a-NiFeMo, along with an increased oxidation state of Ni ions and enriched oxygen vacancies. These combined effects lead to an improved oxygen evolution reaction performance and finally result in a reduced charge-transfer resistance at the solid/liquid interface, causing the interfacial charge-injection efficiency to be enormously enhanced from the original 25.1% in pure BiVO4 to 83.3% in BiVO4/a-NiFeMo after being in situ activated. Our result indicates that the rapid surface-reconstruction phenomenon shown in the amorphous materials may provide a promising strategy for designing a highly efficient cocatalyst for photoelectrodes.
研究领域:
材料科学
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电化学
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可再生能源
✓ 已验证
DOI
高影响因子
ChemCatChem
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2020
·Vol. 12
·期 20
·5149-5155
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IF 4.853
Suli Liu,Xueqin Mu,Pengxia Ji,Yun Lv,Lei Wang,Quan Zhou,Changyun Chen,Shichun Mu
Graphical Decorating nanorods : We demonstrate the first metal-phosphides-metal system consisting of Ru and FeCoP, which forms unique CoFeP@Ru nanorod using a simple one-pot synthetic method. Due to its optimal dual cation decorating effects, improved conductivity and rod-like morphology, this catalyst shows superior electro-catalytic HER and OER performances, which are superior to those of some recently reported phosphides and close to that of commercial catalysts. Interfacial engineering and defect modulation can provide abundant active sites for catalysts to further boost the catalysis process. In this work, we develop a strategy to grow multi-heterogeneous cobalt phosphide (CoP) nanorods with rich interfaces and defects along the one-dimensional (1D) nanostructure by dual incorporation of Fe and Ru (CoFeP@Ru). Such a catalyst exhibits high activity and stability towards the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), with overpotentials of only 38 mV in 0.5 M H 2 SO 4 and 48 mV in 1.0 M KOH for HER, and an overpotential of 340 mV in 0.1 M KOH for OER at 10 mA cm −2 . Finally, as the bifunctional catalyst, an alkali electrolyzer is assembled and delivers at a low cell voltage, with almost 100 % Faradaic efficiency. Our experimental results demonstrate that Fe incorporation can disturb or even break the periodic structure of cobalt phosphides, causing a redistribution of the electronic structure and electron density of activity sites, while Ru can significantly enhance the catalytic kinetics, as well as electrochemical and mechanical stability.
研究领域:
材料科学
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电化学
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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
Jiaying Shen,Yefan Liu,Qianqiao Chen,Wanchin Yu,Qin Zhong
Rational design and construction of bifunctional heterostructure electrocatalysts with high-conductivity and more active sites is imperative for water splitting. Herein, based on the tunable property of layered double hydroxide laminates cations, topological transformation technology and template confine method, a series of high-performance bifunctional catalysts composed of transition metal doping NiCo 2 S 4 (MNiCoS 4 , M = Cu, Fe, Zn, Mn) and 1T-MoS 2 were in-situ fabricated on nickel foam. In particular, CuNiCoS 4 /1T-MoS 2 exhibits an ultralow overpotential of 163 mV at 50 mA cm −2 for oxygen evolution reaction (OER) and favorable hydrogen evolution reaction activity. The two-electrode system requires only 1.52 V to attain a current density of 10 mA cm −2 . To the best of our knowledge, its OER electrocatalytic activity far exceed state-of-art catalysts reported. The outstanding performance of this series of catalysts can be attributed to two aspects. First, the highly conductive 1T-MoS 2 can facilitate electron transfer , and second, the defect-rich heterostructure can effectively regulate the electronic structure of the active metal and expose abundant active sites. This work provides a valuable strategy for developing high activity electrocatalysts for efficient water splitting.
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
ENERGY & FUELS
·
2020
·
IF 3.421
Xiaolin He,Biyun Lin,Liqin Yang,Chaoqun Shang,Shanshan Li,Zhihong Chen,Xin Wang
As an ideal photocatalyst in the photoelectrochemical (PEC) water oxidation area, hematite (α-Fe2O3) has received much attention from scientists on account of its favorable band gap and excellent stability in alkaline media. However, the practical photocurrent yield of α-Fe2O3 is much less than the theoretical value because of the high charge recombination and the low charge transport. Herein, a novel ferroelectric Fe2O3/Pb(Zr0.2Ti0.8)O3 photoanode (Fe2O3/PZT) was fabricated by simple spin coating along with a one-step calcination method for the first time. As expected, the Fe2O3/PZT photoanode showed a significantly greater photocurrent (by ∼10 times) and the initial potential (by ∼100 mV) was more negative than that of the pure Fe2O3 nanorod photoanode, which was attributed to the depletion layer width increase and the upward band bending in Fe2O3 induced by ferroelectric polarization of PZT, leading to efficient charge separation and injection. Moreover, the photoelectrochemical performance of the Fe2O3/PZT nanorod photoanode could be regulated by simply changing the polarization direction of PZT. In addition, the Fe2O3/PZT nanorod photoanode showed not only a fast and repetitive light response but also long-term stability for 96 h. This research presents a novel route to enhance the efficiency of charge separation and affords theoretical guidance for preparing the high-efficiency PEC photoanodes and the switchable control of the photoelectrochemical response.
研究领域:
材料科学
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能源科学
·
光催化
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Nan Jiang,Liyuan Zhang,Zengyuan Li,Zhizhen Ye,Haiping He,Jie Jiang,Liping Zhu
Lead halide perovskites with excellent optoelectronic properties have been recognized as one of the most promising photoelectrode materials for photoelectrochemical water splitting during the past decade. However, fabricating stable and efficient halide-perovskite photoanodes remains a considerable challenge due to the degradation of halide perovskites in electrolyte environment and the lack of effective encapsulating techniques. Herein, we report a unique halide-perovskite photoelectrochemical cell by using an inverted fluorine-doped tin oxide coated glass (FTO/glass) as the waterproof hole-transport layer for encapsulation, and inserting a two-dimensional (2D) perovskite layer for passivation. The halide-perovskite photoanode achieves high-efficiency oxygen evolution reaction, fast bubble releasing and an outstanding long-term stability of 30.9 h at 90 % of the initial photocurrent density (up to 16.55 mA cm −2 at 1.23 V versus the reversible hydrogen electrode) under solar illumination. Our unique and cost-effective encapsulation method could be a potential solution for realizing stable and efficient halide-perovskite photoelectrodes for solar-fuel energy conversion.
研究领域:
材料科学
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能源转换技术
✓ 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）