ACS Applied Materials & Interfaces
·
2014
·
IF 5.9
Huaqiao Tan,Zhao Zhao,Wan-bin Zhu,Eric N. Coker,Binsong Li,Min Zheng,Weixing Yu,Hongyou Fan,Zaicheng Sun
A facile and general method has been developed to fabricate oxygen vacancies on perovskite SrTiO3 (STO) nanocrystals through a controllable solid-state reaction of NaBH4 and SrTiO3 nanocrystals. STO samples with tunable color, oxygen vacancy concentration on nanocrystal surface have been synthesized. TEM results reveal that these STO samples have a crystalline core/amorphous shell structure (SrTiO3@SrTiO3–x). XPS and EPR results disclose that the oxygen vacancy concentration increases with the increase of reaction time and temperature. The concentration of oxygen vacancies calculated from TGA data, could reach 5.07% (atom) in this study. UV–vis spectra and photocatalytic results indicate that oxygen vacancies on STO surface play an important role in influencing the light absorption and photocatalytic performance. However, an excess amount of oxygen vacancies leads to a decrease of photocatalytic performance. The optimal photocatalytic activity for H2 production under UV–vis irradiation is up to 2.2 mmol h–1 g–1, which is about 2.3 times than the original SrTiO3, corresponding to 3.28% (atom) of oxygen vacancy concentration.
研究领域:
材料科学
·
光催化
·
纳米材料
·
表面化学
·
能源材料
·
无机化学
✓ 已验证
DOI
高影响因子
Small
·
2025
·
IF 12.1
Jing Cui,Xiaoqi Yin,Kangning Sun,Jingzhong Duan,Liwen Tan,Xiankai Li
Liquid metal (LM) micro/nano droplets, when used as initiators, fillers, and cross-linkers, are desirable for enhancing toughness, self-healing, and sensing properties of LM hydrogels. Despite recent progress in designing multifunctional LM hydrogel, porous LM hydrogel is not widely reported. In this study, porous LM hydrogel is fabricated by sonicating bulk LM into carboxymethyl chitosan (CMCS) solution (> 2 wt.%). A high-density polymeric network forms by a cross-linked structure through metal ions (i.e., Ga 3+ ) produced from sonication with bifunctional groups (i.e., carboxyl and amino groups) of CMCS, hydrogen bonding, and electrostatic interactions. Without additional initiators or cross-linkers, LM hydrogels with different gelation times are obtained by adjusting the ratio of LM/CMCS, thereby enabling additive manufacturing. Owing to the reaction of gallium and its oxides with water, hydrogen gas is produced, leading to the formation of numerous pores within the hydrogel. The floatable hydrogel expand its volume to ≈1.5 times of its original size, reducing its density to float on water. This innovative LM hydrogel serves as flexible sensors with high sensitivity and as a solar-thermal-electrical generator by leveraging the LM's photo-thermal conversion properties, which not only extends the fundamental knowledge of floatable LM hydrogels, but also demonstrate its potential for versatile applications.
研究领域:
材料科学
·
化学工程
·
生物医学工程
·
能源技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2013
·Vol. 15
·期 37
·15660-15668
·
IF 3.829
Jungang Hou,Chao Yang,Huijie Cheng,Zheng Wang,Shuqiang Jiao,Hongmin Zhu
Highly efficient hydrogen production can be achieved by three-dimensional (3D) architectures of CdS quantum dots (QDs) incorporated in the porous assembly of marigold-like ZnIn2S4 heterostructures coupled with graphene, leading to an efficient electron transfer between them and the enhancement of the ZnIn2S4 photostability. The as-prepared samples were characterized by X-ray diffraction, electron microscopy, Brunauer–Emmett–Teller analysis, X-ray photoelectron spectroscopy, UV-vis diffuse reflectance absorption spectra, and photoluminescence spectra. Especially, 3 wt% CdS QDs decorated ZnIn2S4 heteroarchitectures showed a high rate of H2-production at 1.9 mmol h−1, more 2.7 times than that of ZnIn2S4. The rate was further increased to 2.7 mmol h−1 with a high quantum efficiency of 56% using the 3 wt% CdS QDs decorated ZnIn2S4 composites coupled with 1 wt% graphene (about 4 times higher than that of the pure ZnIn2S4). Moreover, the CdS QDs/graphene/ZnIn2S4 exhibited strong durability due to the high hydrothermal stability of the flower-like structure and the inhibition of CdS leaching owing to its strong interaction with ZnIn2S4. The excellent photocatalytic performance is ascribed to the enhanced light absorption and the improved separation of photogenerated carriers. This finding highlights the validity of 3D semiconductor heterostructures as effective building blocks for exploring efficient visible-light-active photocatalysts.
研究领域:
材料科学
·
光催化
·
纳米材料
·
能源化学
·
半导体物理
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2017
·Vol. 24
·期 30
·23538-23548
·
IF 2.741
Tang Fenglin,Xin Jia,Zheng Xilai,Zheng Tianyuan,Yuan Xianzheng,Kolditz Olaf
A microscale zero-valent iron (mZVI)-based in situ reactive zone is a promising technology for contaminated groundwater remediation. Estimation of mZVI aging behavior after its injection into the subsurface is essential for efficiency and longevity assessments. In this study, batch tests were conducted to investigate the effect of initial pH on mZVI aging dynamics, as well as the formation and evolution of aging products over 112 days. Results indicated that mZVI aging accelerated with decreasing initial pH. Corrosion rates of mZVI particles under pH 6.0 and 7.5 were approximately two orders of magnitude higher than those observed at pH 9.0. The morphological, structural, and compositional evolution of mZVI particles in three systems (pH = 6.0, 7.5, and 9.0) were investigated using scanning electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. In acidic and neutral solutions, a thick passivation layer with loosely and unevenly distributed aging precipitates was observed, and Fe 3 O 4 was the final aging precipitate. Nevertheless, in alkaline solutions, minute aging precipitates were detected on the mZVI surface at 112 day. Characterization results suggested that mZVI was oxidized via the Fe 0 –Fe(OH) 2 –Fe 3 O 4 route. These findings shed new light on mZVI aging mechanisms, particularly its physicochemical characteristics and the structural evolution of mZVI in field-scale groundwater remediation applications.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2024
·Vol. 59
·期 41
·19642-19650
·
IF 3.5
Chu Yican,Yao Zhendong,Liu Min,Li Wenqing,Gu Jing,Huang Zhenguang,Xie Jiaxing,Li Chao,Cui Yongfu,Li Yun,Fan Meiqiang
The hydrolysis of silicon and its compounds to produce hydrogen for fuel cell remains a major problem. The main obstacle is the weak hydrolytic activity and slow kinetics of silicon. In this work, the alloying properties of Si and Ca to improve its hydrolytic activity, and studied the film breaking effect of different metals and halogen ions on its passivation layer. The results show that the hydrogen production of the alloy is still determined by its phase composition. Among the common metal (Ni, Bi, Sn) and halogen ions (F – , Cl – ) catalyzed by hydrolysis, Ni and F – showed a good synergistic effect, resulting in a hydrogen yield of 269 mL/g at room temperature without alkali. Graphical
The effects of metal ions and halogens on the hydrolytic properties of Ca–Si alloy were investigated, and Ni 2+ and F — showed good synergistic effect.
研究领域:
材料化学
·
能源材料
·
无机化学
·
氢能源
·
金属合金
✓ 已验证
DOI
高影响因子
ChemSusChem
·
2025
·
IF 6.6
Yanmei Zheng,Qichao Chen,Jianghong Ouyang,Ziwei Hang,Zupeng Chen
The simultaneous photocatalytic production of hydrogen peroxide (H 2 O 2 ) and hydrogen (H 2 ) from water has received widespread attention. However, the inherent inefficiencies in dynamic processes, such as sluggish charge separation or accumulation, pose substantial limitations to overall photocatalytic performance. Here, a manganese-assisted carbon nitride/carbon nanoribbons (CN/CT-Mn) heterojunction is developed via a straightforward thermal evaporation process. The optimized CN/CT-Mn photocatalyst demonstrates exceptional activity for concurrent H 2 O 2 and H 2 production under ambient conditions, achieving impressive yields of 104 and 720 μmol g −1 h −1 , respectively. The enhanced performance can be attributed to the enhanced charge separation and the regulation of electron reduction kinetics resulting from the construction of the heterojunction interface. Notably, the presence of Mn atoms introduces an additional impurity level, enabling precise control over the reduction selectivity of photogenerated electrons. Graphical Solar-driven dual production of H 2 and H 2 O 2 is achieved via an Mn-doped carbon nitride/nanoribbon heterojunction. The built-in electric field at the heterojunction interface directs electron transfer from CN to Mn-CT, while Mn atoms enhance proton adsorption, selectively boosting H 2 evolution.
研究领域:
材料科学
·
光催化
·
能源化学
·
纳米材料
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Hongjie Yu,Shaojian Jiang,Wenjie Zhan,Yuqin Liang,Kai Deng,Ziqiang Wang,You Xu,Hongjing Wang,Liang Wang
The high cost is a major issue that has contributed to the slow industrialization of electrolytic water. To reduce the cell voltage to below 0.5 V, we constructed a hybrid electrolytic water system with coupled hydrogen evolution reaction (HER) and formaldehyde oxidation reaction (FOR). For FOR, the abundant Cu 0 and Cu + in nitrogen-doped Cu/Cu 2+1 O on Cu foam (N-Cu/Cu 2+1 O/CF) can effectively promote the adsorption and activation of H 2 O and HCHO molecules, and facilitate the cleavage of O-H and C-H, while nitrogen doping can promote the exposure of Cu active sites. For HER//FOR, a cell voltage of only 0.42 V is required to achieve 500 mA cm −2 . The system can not only produce H 2 routinely at the cathode through HER but also release H 2 by HCHO oxidation. The construction of a dual hydrogen production system with industrial current density at ultra-low voltage provides a new idea to reduce the cost of hydrogen production.
研究领域:
能源科学
·
电化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2019
·
IF 6.361
Weixuan Zeng,Sheng Cao,Lulu Qiao,Anquan Zhu,Pengfei Tan,Yongjin Ma,Yuan Bian,Rui Dong,Ziyu Wang,Jun Pan
Rationally and skillfully constructing semiconductor heterostructured photocatalysts , benefited from the facilitated the carrier separation and transfer, have attracted intensive attention and been demonstrated as a manageable and effective strategy to develop high-performance photocatalysts. Herein, a novel SrTaO 2 N/Ta 3 N 5 heterostructured photocatalyst were fabricated by one-pot nitridation of Sr 2 Ta 2 O 7 /Ta 2 O 5 precursor under ammonia flow. The as-prepared SrTaO 2 N/Ta 3 N 5 is a type-II heterostructure with an intimate interface contact, and the photocatalytic hydrogen production over the optimized heterostructure SrTaO 2 N(0.1)/Ta 3 N 5 is about 14.1 times higher than that of individual SrTaO 2 N. The experimental results suggest that the formation of type-II heterostructure and intimate interface contact between Ta 3 N 5 and SrTaO 2 N accelerates the separation and transfer of electrons and holes under visible light irradiation, consequently contribute to the improved hydrogen production rate. Moreover, we highlight that one-pot nitridation has the great potential to apply as an underlying general strategy of designing and fabricating other types of high-efficiency tantalum oxynitride-based heterostructured photocatalysts.
研究领域:
材料科学
·
光催化
·
无机化学
·
能源化学
·
半导体物理
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Jin Song,Fenglong Wu
The concentration of photogenerated electrons on support surface has a significant impact on the photocatalytic performance of the corresponding catalyst. Herein, the CeO 2 -based homojunction support consisted of quantum dots/nanorods (QDs/NRs) was fabricated by two-step calcination with assistance of KCI and NaCl. Based on CeO 2 -QDs/NRs support, the Co-based catalyst exhibited excellent catalytic performance for photocatalytic hydrogen evolution from Ammonia Borane (NH 3 BH 3 ). The catalysts exhibited the highest activity with TOF 96.15 min −1 under optimized conditions, which was significantly improved compared Co/CeO 2 NRs (68.5 min −1 ). Detailed structure characterizations revealed that the QDs with size range from 2 to 5 nm grow on the surface of NRs, which had capacity to transfer more photogenerated electrons from the bulk to surface compared with pristine CeO 2 NRs. Meanwhile, work function was upshifted from CeO 2 NRs to CeO 2 -QDs/NRs. The synergy of two factors drove more electrons transfer from CeO 2 -QDs/NRs to active metal Co, accelerating the adsorption and activation of NH 3 BH 3 . In addition, the forming mechanization QDs by inducing the morphological evolution of CeO 2 nanoparticles was also investigated. This work not only provides efficient photocatalyst for H 2 evolution from NH 3 BH 3 but also provides new insights into the design and preparation efficient QDs-based homojunction catalyst.
研究领域:
材料科学
·
光催化
·
纳米材料
·
能源化学
·
表面科学
✓ 已验证
DOI
高影响因子
Catalysts
·
2025
·Vol. 15
·期 9
·886
·
IF 4
Qianran Feng,Xiaoting Yu,Jinlian Peng,Siying Du,Liuyun Chen,Xinyuan Xu,Tongming Su
Sustainable production of hydrogen is currently a global research hotspot. In this study, a Ni(OH)2cocatalyst was loaded on Zn0.8Cd0.2S to form Ni(OH)2/ZCS composites and achieve highly efficient photocatalytic hydrogen production. After Ni(OH)2loading, a close contact interface was established between Ni(OH)2and Zn0.8Cd0.2S, which increased the separation efficiency of the photogenerated electrons and holes. Moreover, the addition of Ni(OH)2increases the specific surface area and light absorption of Ni(OH)2/Zn0.8Cd0.2S, and the Ni(OH)2can act as active sites for photocatalytic hydrogen production. The photocatalytic H2production rate of Ni(OH)2/ZCS composites increases with the increase in the Ni amount. 9Ni(OH)2/ZCS exhibited the optimum H2production rate of 12.88 mmol h−1g−1, which was 9.9 times higher than that of Zn0.8Cd0.2S. When the amount of Ni(OH)2is further increased, the excess Ni(OH)2covers the active site of Zn0.8Cd0.2S and reduced the light absorption of Zn0.8Cd0.2S, resulting in a decrease in the H2production rate. Furthermore, the H2production rate of 9Ni(OH)2/ZCS decreased from 12.88 to 5.15 mmol g−1h−1after 3 cycles. The main reason for the decline in the photocatalytic performance of Ni(OH)2/ZCS is the photocorrosion of Zn0.8Cd0.2S. This study provides an innovative design for loading Ni(OH)2cocatalysts on Zn0.8Cd0.2S to improve the performance of photocatalysts.
研究领域:
材料科学
·
光催化
·
氢能
·
纳米材料
·
可持续能源
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2018
·Vol. 7
·期 2
·503-512
·
IF 9.931
Ting Song,Gongchang Zeng,Piyong Zhang,Tingting Wang,Atif Ali,Shaobin Huang,Heping Zeng
Black phosphorus has recently emerged as an excellent 2D semiconductor with high charge-carrier mobility and wide tunable bandgap for photocatalysis. In this research, a simple method was developed to manufacture reticulated carbon nitride materials (CN-4N). Utilizing the self-capturing property of CN-4N to capture black phosphorus quantum dots (BQ) uniformly dispersed in aqueous solution, BQ were successfully implanted in the interior surface of CN-4N to form a unique structure instead of the normal exterior surface contact pattern. The optimized CN-4N(BQ) showed good stability and achieved an excellent hydrogen production rate of 13.83 mmol h−1 g−1, which was 3.3- and 35.5-fold higher than that of CN-4N and bulk CN (NCN), respectively. The experimental results illustrated that the greatly improved photocatalytic performance of CN-4N(BQ) was attributed to the joint actions of the abundant active sites provided by the ultra-porous structure, the excellent vis-NIR absorption capability, the spatially separated reactive sites for the redox reaction, and the greatly enhanced photoinduced electron–hole separation efficiency. This research provides novel insight for the rational fabrication of CN-based hybrids for various applications.
研究领域:
材料科学
·
化学工程
·
纳米技术
·
光催化
✓ 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）