MOLECULES
·
2023
·Vol. 28
·期 6
·2508
·
IF 4.6
Hong Qiu,Xiaohui Ma,Hongxia Fan,Yueyan Fan,Yajie Li,Hualei Zhou,Wenjun Li
Molybdenum-based cocatalyst being used to construct heterojunctions for efficient photocatalytic H2production is a promising research hotspot. In this work, CdIn2S4was successfully closely supported on bulk Mo2C via the hydrothermal method. Based on their matching band structures, they formed a Type Ⅰ heterojunction after the combination of Mo2C (1.1 eV, −0.27 V, 0.83 V) and CdIn2S4(2.3 eV, −0.74 V, 1.56 V). A series of characterizations proved that the heterojunction composite had higher charge separation efficiency compared to a single compound. Meanwhile, Mo2C in heterojunction could act as an active site for hydrogen production. The photocatalytic H2production activity of the heterojunction composites was significantly improved, and the maximum activity was up to 1178.32 μmmol h−1g−1for 5Mo2C/CdIn2S4composites. 5Mo2C/CdIn2S4heterojunction composites possess excellent durability in three cycles (loss of 6%). Additionally, the mechanism of increased activity for composites was also investigated. This study provides a guide to designing noble-metal-free photocatalyst for highly efficient photocatalytic H2evolution.Keywords:noble-metal-free;Mo2C;CdIn2S4;heterojunction;carrier separation
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2018
·
IF 5.091
Haitao Li,Ming Wang,Yiping Wei,Fei Long
A series of noble-metal-free NiS 2 -loaded g-C 3 N 4 hybrid composites were prepared via simple hydrothermal method. Benefited from the wider spectral response range and the effective separation of photoelectron-holes of g-C 3 N 4 -NiS 2 heterojunction catalysts, as well as the rich unsaturated active S atoms on the NiS 2 with S 2 2− , the composite catalysts has prominent photocatalytic performance for H 2 evolution. Remarkably, the optimal composite photocatalysts achieved an average hydrogen production rate as high as 715.83 μmol/h/g in 3 h under visible-light irradiation, which is 2.75 times as high as that of precious metal Pt (259.5 μmol/h/g) as a co-catalyst. Besides, the composite catalyst still shows prominent photocatalytic performance for H 2 evolution after three continuous photocatalytic reaction cycles for 9 h. This study provided a facile method to build a low-cost but effective metal sulfide co-catalyst for hydrogen production under visible light irradiation.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Xiaohui Ma,Chaojun Ren,Hongda Li,Xintong Liu,Xinyang Li,Kun Han,Wenjun Li,Yifei Zhan,Ajmal Khan,Zhidong Chang,Changyan Sun,Hualei Zhou
Currently, designing novel noble-metal-free photocatalysts with efficient carriers migration and catalytically active sites have been a researching hotspot in photocatalytic hydrogen evolution. In this paper, a novel noble-metal-free Mo 2 C-In 2 S 3 heterojunction was synthesized by a simple hydrothermal method. Morphology characterization revealed In 2 S 3 was attached to Mo 2 C. Electrochemical results showed Mo 2 C improved the interface conductivity, and promoted the transportation of photogenerated carriers. Under visible light, the optimal Mo 2 C-In 2 S 3 composite achieved a H 2 generation rate of 535.58 μmol h −1 g −1 , which was 175.6 and 25.8 times higher than pristine In 2 S 3 (3.05 μmol h −1 g −1 ) and In 2 S 3 -1% Pt (20.73 μmol h −1 g −1 ). In addition, a reasonable mechanism of the elevated photocatalytic activity was also discussed. This study demonstrates commercial Mo 2 C has an important effect of separating carriers and replacing Pt as co-catalyst in heterojunctions. This research also provides a method to design and synthesize new noble-metal-free photocatalysts for excellent hydrogen production activity.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Qiuhao Li,Xiu-Qing Qiao,Yanlin Jia,Dongfang Hou,Dong-Sheng Li
Design and construction of highly efficient and stable co-catalysts are critical for the photocatalytic H 2 generation from water. In this work, we report the novel CdS/CoMoS x core-shell nanowires (CCMS NWs) prepared by a facile in situ synthesis method. The in situ growth of amorphous CoMoS x shell on the surface of CdS NWs core efficiently promoted the photocatalytic H 2 evolution under visible light irradiation . The optimized CCMS sample containing 15 mol% CoMoS x (CCMS-15) achieves a H 2 evolution rate as high as 477.96 μmol·h − 1 under visible light irradiation, up to 26.3 times over bare CdS (18.2 μmol·h − 1 ). Moreover, the constructed core-shell CdS/CoMoS x photocatalyst shows a long-term stability without noticeable activity degradation. Based on the detailed analyses of PL , UV–vis DRS , transient photocurrent responses, EIS, Mott-Schottky plots and ESR , the significantly enhanced activity is ascribed to the synergistic effect of increased visible light absorption , suppressed photo-generated charge carries recombination and the amorphous defective structure of CoMoS x co-catalyst. In consideration of its facile synthesis, low cost, and superior performance, the amorphous CoMoS x appears to be promising co-catalyst for photocatalytic water splitting.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
Nano Research
·
2020
·Vol. 13
·期 12
·3321-3329
·
IF 8.183
Xie Heping,Lan Cheng,Chen Bin,Wang Fuhuan,Liu Tao
The development of noble-metal-free electrocatalysts for water splitting is indispensable for the efficient production of hydrogen fuel. Herein, a Co-doped Ni-Mo phosphide nanorod arrays fabricated on porous Ni foam was shown to be an efficient binder-free electrocatalyst for water splitting. This catalyst featured exceptional activity, exhibiting an overpotential of 29 mV at a current density of 10 mA·cm −2 for the hydrogen evolution reaction, whereas the corresponding precatalyst exhibited an overpotential of 314 mV at a current density of 50 mA·cm −2 for the oxygen evolution reaction. The achieved electrocatalytic performance provided access to a simple water splitting system, affording a current density of 10 mA·cm −2 at 1.47 V in 1 M KOH electrolyte. Density functional theory results indicated that Co doping and phosphorization were responsible for the high electrocatalytic performance. Thus, this work paves the way for the development of novel noble-metal-free electrocatalysts for practical H 2 production via water splitting.
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
·
2018
·Vol. 6
·期 10
·4386-4393
·
IF 9.931
Qilu Yao,Zhang-Hui Lu,Rui Zhang,Shiliang Zhang,Xiangshu Chen,Hai-Long Jiang
Hydrazine borane (N2H4BH3, 15.4 wt% H) has been considered as a highly promising hydrogen storage material because of its inherent advantages such as high hydrogen content and high stability in the solid state. However, the practical application of N2H4BH3 for the generation of hydrogen is strongly inhibited by the need for expensive noble metal-based catalysts. To overcome this challenge, noble-metal-free CuNiMo nanocatalysts were prepared using a facile chemical reduction approach under an ambient atmosphere at room temperature. Unexpectedly, the resultant CuNiMo catalyst exhibits excellent catalytic activity, and 100% H2 selectivity toward hydrogen generation from N2H4BH3via its BH3 group hydrolysis and N2H4 moiety decomposition at 323 K. To the best of our knowledge, this is the first report of a noble-metal-free catalyst achieving a complete conversion of N2H4BH3 to H2. In addition, CuNiMo can achieve a complete dehydrogenation of hydrous hydrazine (N2H4·H2O). The excellent catalytic performance of the Cu0.4Ni0.6Mo catalyst may be attributed to the electronic modification among Cu, Ni and Mo, and may also be related to the strong basic sites of Cu0.4Ni0.6Mo. The present simple, low cost, highly efficient, and highly selective catalyst may promote the practical application of N2H4BH3 as an effective hydrogen storage material.
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 THE ELECTROCHEMICAL SOCIETY
·
2020
·Vol. 167
·期 11
·116503
·
IF 3.721
Yanhua Lei,Ning Tan,Yizhen Zhu,Da Huo,Shibin Sun,Yuliang Zhang,Guanhui Gao
Noble Metal-free catalysts attracted much attention as promising candidates for Pt-based catalyst replacement to advance applications related to oxygen reduction reaction (ORR), which is critical for large-scale renewable energy storage and conversion. Herein, this work focused on a synthesis of noble metal-free ORR electrocatalysts consisting of porous N-rich carbon/MXene, which was obtained using very conductive and reactive Ti3C2 MXene and polypyrrole (PPy) as a C and N source. The electrocatalyst exhibited excellent electrocatalytic activity and stability with an onset and a half-wave potentials equal to 0.85 and 0.71 V, respectively. Results obtained in this work demonstrate how to design efficient noble metal-free ORR electrocatalysts applicable to other chemical systems.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Ying-juan Hao,Li-gang Tian,Erhong Duan,Jixing Liu,Tian-yuan Qi,Wei-qi Kong,Xue-han Qi,Xinying Liu,Ying Liu,Jun Zhao,Fa-tang Li
Methane is a greenhouse gas that contributes to global warming. Hence, effectively removing the low concentration (<1000 ppm) of methane in the environment is an issue that deserves research in the field of catalysis. In this study, oxygen–magnesium bivacancies are simultaneously imbedded into MgO by designing an in situ reduction combustion atmosphere for oxygen release and substituting magnesium with carbon to induce the formation of magnesium vacancies. The DFT calculations reveal that the surface electron density of MgO is improved by the oxygen vacancy structure and the substitution of Mg by C in bulk; this accelerates migration of the charge from the material surface to the adsorbed oxygen species, which leads to abundant surface peroxide species that enable activation and oxidation of methane at a low temperature (below 200 °C). This work could provide a concept for developing non-noble or transition metal oxides for low-temperature activation and conversion of alkanes in the thermocatalytic field through reactive oxygen species.
研究领域:
催化化学
·
环境科学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Zuobin Zhang,Jianxin Yi,Hongjie Han,Yuqing Meng,He Zhang,Yong Jiang
High-performance noble metal-free gas sensors are crucial for widespread applications in various areas. Non-Nernstian electrochemical sensors have attracted tremendous attention, but are limited by the high cost and low efficiency of Pt electrode. Moreover, responses from different electrodes usually have the same polarity, degrading the sensor performance. Here we report a reverse response on a series of mixed ionic–electronic conductors (MIECs). Exemplary SrFe0.5Ti0.5O3-δ (SFT50) perovskite shows excellent H2 sensing properties, including high sensitivity and selectivity, humidity resistance, and long-term stability. Strikingly, the response is positive, as opposed to the usual one. Such an unusual response is ascribed to the change of the surface electrostatic potential due to the gas chemical reaction, which outcompetes traditional mechanisms, thereby reversing the response polarity. A conceptual noble-metal-free sensor with dual oxide electrodes of opposite polarity is designed by substituting SFT50 for the benchmark Pt, achieving a 1.5–2.0× increase in H2 response, sensitivity, and selectivity and a low limit of detection of 16 ppb. The ideal unity of excellent sensing and unusual polarity for MIECs can be used to optimize the performance of a variety of conventional sensors while reducing the cost. Our findings provide new insights into electrochemical gas sensing and offer a facile approach for developing low-cost high-performance gas sensors.
研究领域:
材料科学
·
传感器技术
·
电化学
✓ 已验证
DOI
高影响因子
MATERIALS & DESIGN
·
2021
·
IF 7.991
Qia Zhang,Ling Kang,JianXiong Zou,Chun Huang,Zhiwei Gong,Jian Zhang
Sustainable and low-cost cellulose-based metallisation is the prerequisite for wearable and disposable electronics fabrication. In this paper, to realize the simplified, low-cost and high efficient metallisation, a new method had been proposed without both the noble metal activators and the corrosive chemicals. The modified electroless plating processes had been employed in activation and deposition procedure. The nickel ions were first physiadsorbed on the cellulose paper (CP) fibers and then reduced into clusters by reducing agent which can act as the seeds to initiate the electroless plating process. The gold galvanic displacement was conducted further to modify the nickel surface. Via these processes, the cellulose paper was metallised with Ni-P and Au/Ni-P successfully. The morphological and microstructural properties of the resulted Ni-P/CP and Au/Ni-P/CP hybrids were evaluated. The Ni-P/CP composites had a low surface resistance below 0.5 Ω sq -1 while the Au/Ni-P/CP composites are below 0.1 Ω sq -1 . The relationship between the mechanical and electrical properties with the plating parameters is discussed. The results indicated that Au/Ni-P/CP had good electrical conductivity and mechanical flexibility. Finally, the application demonstration for supercapacitor with the modified metallisation method was exhibited. This work offers a facile and non-toxic path to develop high-performance metallisation for functional cellulose-based materials.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Xunwei Ma,Rikai Liang,Yiming Wang,Liugang Wu,Fengjing Lei,Jinchen Fan,Lincai Wang,Weiju Hao
The economical and efficient preparation of highly stable electrodes for hydrogen from water splitting is one of the current challenges. Herein, a flexible and durable bifunctional nickel–cobalt-phosphide electrode is constructed in situ on hydrophilicity filter paper (NiCoP@HP) via a one-step mild electroless plating method for industrial-scale water splitting. The bimetallic synergy of Ni-Co facilitates efficient electron transfer, while the electronegativity of phosphide contributes to high intrinsic activity, and the flexible paper substrate allow the electrode to be folded and bent. The NiCoP@HP electrodes exhibit outstanding performance for the hydrogen/oxygen evolution reaction (HER/OER), with low overpotentials only 43 mV and 164 mV at a current density of 10 mA cm −2 in simulated seawater (1.0 M KOH + 0.5 M NaCl). Importantly, the NiCoP@HP electrode demonstrates long-term stability, operating for over 1440 h at a current density of 500 mA cm −2 in 1.0 M KOH + 0.5 M NaCl and 1.0 M KOH + Seawater, respectively. This universally applicable method allows the preparation of a range of highly efficient catalytic electrodes (Fe, Mo, W, etc.). This work provides a simple, scalable, and versatile approach for the in situ construction of noble metal-free, highly efficient, and cost-effective bifunctional electrocatalysts, opening new possibilities for industrial-scale water splitting.
研究领域:
材料科学
·
电化学
·
可再生能源
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2021
·Vol. 168
·期 4
·044516
·
IF 4.316
Lei Yanhua,Ning Tan,Da Huo,Mengchao Ding,Yuliang Zhang,Tong Liu,Ruixuan Yu,Sha Cheng,Runhua Fan
The oxygen reduction reaction (ORR) is a crucial cathodic process and a technology providing renewable energy. It is essential to create ORR catalysts not containing noble metals yet still affordable and possessing high-efficiency and long-term durability. Therefore, this work developed a highly porous N-doped carbon catalyst embedded with CeO2 nanoparticles (NPs). This composite catalyst was synthesized by pyrolysis of PANI-encapsulated CeO2 NPs (CeO2/PANI) combined with in situ polymerization. The resulting catalyst exhibited an outstanding ORR performance with 0.94 and 0.81 mV onset and positive half-wave potentials, respectively, and 5.52 mA cm−2 diffusion-limited current density. The catalyst also demonstrated excellent stability. These exceptional characteristics indicate that a synergy of the N-doped carbon and CeO2 NPs provide a novel strategy of fabrication of novel ORR catalysts without using noble-metals for applications related to fuel cells and metal-air batteries.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）