JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Jiayi Chen,Xu Li,Bo Ma,Xudong Zhao,Yantao Chen
The inferior performance of non-precious metals on electrocatalytic hydrogen evolution can be mainly attributed to the inappropriate adsorption strength of intermediates. A core–shell heterostructure of CoP@Ni is developed by hydrothermal reaction, thermal phosphorization and subsequent electrodeposition, with metallic Ni supported by CoP nanowire array. The as-prepared CoP@Ni core–shell heterostructure nanowire array has a superior activity on hydrogen evolution in alkaline electrolyte, with an overpotential of 71 mV to drive 10 mA cm −2 and a Tafel slope of 66 mV dec -1 . The electronic structure of CoP@Ni is tuned for modulating the adsorption strength of intermediates. The theoretical calculations reveal that CoP@Ni has metallic characteristics with a zero-bandgap, which leads to the promoted charge transfer. More importantly, the intrinsic activity of CoP@Ni is greatly increased, with a lower energy barrier in the reaction pathway. This work points out the importance of constructing the heterostructure for improving the intrinsic activity, which can pave the way to the exploration of high-performance and cost-effective electrocatalysts for hydrogen production.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
PubMed
高影响因子
Molecular Catalysis
·
2025
·
IF 4.9
Xirui Yan,Haixia Liang,Ruicong Wang,Da Li,Jun Li,Wencai Peng,Jinli Zhang
CO 2 reforming with methane (DRM) is a potential effective carbon neutralization strategy to convert greenhouse gases into syngas. The key to the DRM process is to design active and coking resistant catalysts. Herein, hollow hierarchical bimetallic NiMo-HMgO catalysts were prepared via hydrothermal-impregnation method. The prepared NiMo-HMgO catalysts exhibited higher catalytic performance during the DRM process than commercial NiMo-CMgO catalysts, due to the formation of Ni-Mo-MgO composite on hierarchical MgO (HMgO), which is promoted by exposed (111) polar surface of HMgO with alternate arrangement of anion and cation layers. The deposited carbon and stability can be effectively regulated by adjusting the amount of Ni and the molar ratio of Mo/(Ni+Mo). The synergistic effect of metal and HMgO can provide reference for the research in other related fields.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2018
·
IF 3.525
Bing Zhang,Danping Hui,Yingxuan Li,He Zhao,Chuanyi Wang
The nickel-based complex Ni-CH 3 CH 2 NH 2 -intercalated niobate layered perovskite Ni-CH 3 CH 2 NH 2 /H 1.78 Sr 0.78 Bi 0.22 Nb 2 O 7 was synthesized via a facile in situ chemical reaction method. Using ultrathin H 1.78 Sr 0.78 Bi 0.22 Nb 2 O 7 nanosheets and nickel acetate as precursors. The composition, structure, photophysical properties, and photocatalytic activity for H 2 production of Ni-CH 3 CH 2 NH 2 /H 1.78 Sr 0.78 Bi 0.22 Nb 2 O 7 were studied systematically. The photocatalyst loaded with 0.5 wt% Ni exhibited the highest H 2 evolution rate of 372.67 μmo/h. This was 0.54 times higher than the activity of the H 1.78 Sr 0.78 Bi 0.22 Nb 2 O 7 nanosheets. The activity of the optimized Ni-CH 3 CH 2 NH 2 /H 1.78 Sr 0.78 Bi 0.22 Nb 2 O 7 was comparable to that of the Pt-loaded sample under the same reaction conditions. The photocatalytic activity of the Ni-CH 3 CH 2 NH 2 /H 1.78 Sr 0.78 Bi 0.22 Nb 2 O 7 was mainly attributed to the excellent separation of photogenerated carriers, after formation of the intercalated complex Ni-CH 3 CH 2 NH 2 . This study provides a facile strategy to synthesize a non-precious metal-loaded photocatalyst for H 2 production.
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
Frontiers of Environmental Science & Engineering
·
2022
·Vol. 17
·期 3
·1-12
·
IF 6.048
Gao Yuchen,Jiang Jianguo,Meng Yuan,Ju Tongyao,Han Siyu
Biogas is a renewable biomass energy source mainly composed of CH 4 and CO 2 . Dry reforming is a promising technology for the high-value utilization of biogas. Some impurity gases in biogas can not be completely removed after pretreatment, which may affect the performance of dry reforming. In this study, the influence of typical impurities H 2 S and NH 3 on dry reforming was studied using Ni/MgO catalyst. The results showed that low concentration of H 2 S in biogas could cause serious deactivation of catalyst. Characterization results including EDS, XPS and TOF-SIMS confirmed the adsorption of sulfur on the catalyst surface, which was the cause of catalyst poisoning. We used air calcination method to regenerate the sulfur-poisoned catalysts and found that the regeneration temperature higher than 500 °C could help catalyst recover the original activity. NH 3 in the concentration range of 50–10000 ppm showed a slight inhibitory effect on biogas dry reforming. The decline rate of biogas conversion efficiency increased with the increase of NH 3 concentration. This was related to the reduction of oxygen activity on catalyst surface caused by NH 3 . The synergetic effect of H 2 S and NH 3 in biogas was investigated. The results showed that biogas conversion decreased faster under the coexistence of H 2 S and NH 3 than under the effect of H 2 S alone, so as the surface oxygen activity of catalyst. Air calcination regeneration could also recover the activity of the deactivated catalyst under the synergetic effect of H 2 S and NH 3 .
研究领域:
能源化学
·
催化化学
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2025
·
IF 4.8
Zhenwen Yang,Ziyi Shui,Ben Niu,Xiaoxiao Duan,Zheng Wei,Guoxia Jiang,Zhengping Hao
NH 3 decomposition is receiving increased attention for on-site CO x -free H 2 generation. Unfortunately, the harsh reaction conditions often cause sintering of active metals. Here we report a simple method to achieve well Ni dispersion by nano-structuring the BN support with La species. The surface reaction-induced LaBO 3 nano-islands on BN support have a strong affinity for Ni atoms, which can capture and confine Ni species to yield a large population of well dispersed Ni clusters and nanoparticles. The Ni species selectively anchored on LaBO 3 islands expose more active sites and boost desorption of N 2 and H 2 , exhibiting superior activity and stability for NH 3 decomposition. In addition, it is revealed that the Ni dispersion is sensitive to the change of the support surface structure. These findings highlight the important role of support structure in determining the nature of the metal phase and provide guidance for designing catalysts with controlled catalytic structure and reactivity.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Long Liu,Siyuan Zhao,Yue Ji,Ziliang Wang
Photocatalysis, as a technology for splitting water to produce hydrogen, has been paid more and more attention. However, the catalyst has fewer active sites and a fast carrier recombination rate resulting in lower activity. In this work, BiOBr-Ni with Ni single atoms and oxygen vacancies was prepared by the microwave - assisted method. The SEM results show that the BiOBr-Ni surface layer is composed of nano-sheets. Electron paramagnetic resonance (EPR) indicates that the prepared BiOBr-Ni contains oxygen vacancies. XRD, XPS and spherical electron microscopy have proved that Ni exists in the form of single atom. In the process of photocatalytic hydrogen production, BiOBr-Ni showed excellent photocatalytic activity. DFT and experimental tests show that the improved photocatalytic hydrogen production is the joint action of oxygen vacancy and Ni single atom, which not only enhances the carrier separation efficiency but also greatly reduces the reaction energy barrier.
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
·
2025
·
IF 8.2
Zunjie Zhang,Bingcheng Ge,Mengran Liu,Tianfang Yang,Shuaitong Wang,Yang Liu,Yingjie Yang,Shuyan Gao
The electrocatalytic reduction reaction of nitrate (NO3RR) is anticipated to convert nitrogen-containing pollutants into valuable ammonia products. Copper-based catalysts have received great attention because of their good performance in the NO3RR due to the strong binding energy with *NO3 intermediates. However, the poor H2O dissociation ability of Cu is unable to provide H• in time for the hydrogenation reaction of NOx, thus hindering the electroreduction of the NO3–. Herein, we designed a shell–core nanocube electrocatalyst Cu2O@Ni(OH)2-x (x represents the molar ratio of Ni/Cu) using the liquid phase reduction combined with the etching and precipitation method for electrocatalytic NO3RR. Due to the synergistic effect between the strong nitrate activation ability of Cu and the excellent H2O dissociation ability of Ni(OH)2, Cu2O@Ni(OH)2-3.3% shows an impressive ammonia yield rate (557.9 μmol h–1 cm–2) and Faradaic efficiency (97.4%) at −0.35 V vs. RHE. Operando Raman and Auger electron spectroscopy observe the reduction of Cu2O to Cu during the NO3RR process. Density functional theory calculations combined with electron paramagnetic resonance analysis reveals that Ni(OH)2 can lower the activation energy barrier of H2O dissociation, thereby promoting the generation of H• and accelerating the hydrogenation of *NO during the NO3RR. This research provides an efficient Cu-based catalyst for reducing NO3– and may motivate the development of effective ammonia electrocatalysts for further experimentation.
研究领域:
材料科学
·
电催化
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Xia Wei,Tianyao Wang,Hongbin Dai,Song Li
The hydrazine oxidation reaction (HzOR) plays a critical role in direct hydrazine fuel cells and presents a promising alternative to the kinetics-sluggish oxygen evolution reaction in water reduction. Engineering catalysts with high-density multifold nanotwin structures has emerged as a compelling strategy to enhance catalytic activity. However, the exploration of multifold nanotwins for HzOR applications remains absent. Herein, we report the successful synthesis of a porous Ni-Zn-Cu catalyst featuring high-density twofold and fivefold nanotwins. The Ni-Zn-Cu catalyst supported on Ni foam (Ni-Zn-Cu/Ni foam) exhibits exceptionally high catalytic activity and stability toward the HzOR, achieving a current density of 204.3 mA cm −2 at 0.0 V vs. RHE and retaining up to 89.1 % after 20 h of continuous electrolysis. Online mass spectrometer (MS) analysis indicates that the Ni-Zn-Cu coating facilitates N N bond cleavage of N 2 H 4 . This study offers valuable insights into the development of multifold nanotwin catalysts for advancing HzOR applications.
研究领域:
材料科学
·
催化化学
·
能源科学
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2022
·
IF 24.319
Zhihe Zhang,Zihang Yu,Kai Feng,Binhang Yan
CO 2 methanation is gaining renewed attention due to the emerging application needs such as the power-to-gas concept and long-term space exploration missions. Maximizing the amounts of interfacial sites generally regarded as the efficient active sites is considered to be one of the most direct means to enhance catalytic activity but few breakthroughs have been made. Here, Eu 3+ is introduced to Ni/CeO 2 to promote the Ni-CeO 2 interaction, resulting in a remarkable low-temperature CO 2 methanation activity. Structural characterization indicates that the Ni/CeEu(9:1) catalyst achieves higher Ni dispersion compared to Ni/CeO 2 , which consequently generates more interfacial sites. More interfacial sites enhance the proportions of bidentate carbonates closer to interfacial sites as a faster hydrogenated species during the catalytic process, leading to enhanced low-temperature CO 2 methanation activity over the Ni/CeEu(9:1) catalyst. This work provides a chemical strategy to enhance the amounts of active sites and bring insights into the origin of enhanced catalytic performance.
研究领域:
化学工程
·
催化科学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Siyu Guo,Yanzhi Cai,Laifei Cheng,Yibing Yuan,Yuhan Wang,Haiming Yu,Zhongyi Hu,Dengpeng Chen,Hudie Yuan
Metal–organic frameworks (MOFs) have attracted attention due to their designable structures. However, recently reported MOF microwave-absorbing materials (MAMs) are dominated by powders. It remains a challenge to design MOF/carbon nanotube (CNT) composite structures that combine the mechanical properties of self-supporting flexibility with excellent microwave absorption. This work involves the hydrothermal approach to grow Ni-MOF of different microstructures in situ on the CNT monofilament by adjusting the molar ratio of nickel ions to organic ligands. Subsequently, an ultraflexible self-supporting Ni-MOF/CNT buckypaper (BP) is obtained by directional gas pressure filtration technology. The BP porous skeleton and the Ni-MOF with a unique porous structure provide effective impedance matching. The CNTs contribute to the conduction loss, the cross-scale heterogeneous interface generated by Ni-MOF/CNT BP provides rich interfacial polarization loss, and the porous structure complicates the microwave propagation path. All factors work together to give Ni-MOF/CNT BP an excellent microwave absorption capacity. The minimum reflection losses of Ni-MOF/CNT BPs decorated with granular-, hollow porous prism-, and porous prism-shaped Ni-MOFs reach −50.8, −57.8, and −43.3 dB, respectively. The corresponding effective absorption bandwidths are 4.5, 6.3, and 4.8 GHz, respectively. Furthermore, BPs show remarkable flexibility as they can be wound hundreds of times around a glass rod with a diameter of 4 mm without structural damage. This work presents a new concept for creating ultraflexible self-supported MOF-based MAMs with hierarchical interpenetrating porous structures, with potential application advantages in the field of flexible electronics.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Catalysts
·
2025
·Vol. 15
·期 6
·530
·
IF 4
Yalin Guo,Zhuang Ma,Binbin Jin,Limin Ma,Guodong Yao
The sustainable valorization of lignocellulosic biomass into high-value platform chemicals presents a crucial pathway for reducing reliance on fossil resources. Gamma (γ)-valerolactone (GVL) has gained recognition as a versatile bio-derived compound with broad applications in renewable energy systems and green chemical synthesis. While conventional GVL production strategies from carbohydrate biomass typically depend on noble metal catalysts paired with high-pressure hydrogen gas, these approaches face substantial technical barriers including catalyst costs, hydrogen storage requirements, and operational safety concerns in large-scale applications. This work develops an innovative catalytic system utilizing earth-abundant iron for in situ hydrogen generation through water splitting, integrated with Raney Ni as the hydrogenation catalyst. The designed two-stage process enables direct conversion of cellulose—first through acid hydrolysis to levulinic acid (LA) followed by catalytic hydrogenation to GVL without intermediate purification. Through systematic parameter optimization, a remarkable 61.9% overall GVL yield from cellulose feedstock was achieved. Furthermore, the methodology’s versatility was demonstrated through wheat straw conversion experiments, yielding 24.6% GVL. This integrated methodology explores a technically feasible pathway for direct cellulose-to-GVL conversion utilizing abundant water as the hydrogen source, effectively overcoming the critical limitations associated with conventional hydrogenation technologies regarding hydrogen infrastructure and process safety.
研究领域:
生物化学
·
可再生能源
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
CATALYSIS TODAY
·
2016
·
IF 4.312
Kun Jiang,Dong Sheng,Zihao Zhang,Jie Fu,Zhaoyin Hou,Xiuyang Lu
Mixed MgO–Al 2 O 3 (with different Mg/Al ratio) supported nickel catalysts were prepared via co-precipitation method and used for hydrogenation of levulinic acid to γ-valerolactone under mild condition. Characterization results indicated that mixed MgO–Al 2 O 3 supported Ni catalysts possessed bigger surface area than that of Ni/MgO and Ni/Al 2 O 3 , and Ni dispersed highly on the surface of mixed MgO–Al 2 O 3 support. It was found that mixed MgO–Al 2 O 3 supported Ni catalysts were more active and selective for the hydrogenation of levulinic acid to γ-valerolactone than that of Ni/MgO and Ni/Al 2 O 3 , and the best yield of γ-valerolactone at 160 °C, 1 h and 3 MPa H 2 reached 99.7% over Ni/MgAlO 2.5 , and Ni/Mg 2 Al 2 O 5 could be recycled without obvious loss of its initial activity.
研究领域:
化学工程
·
催化化学
✓ 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）