Journal of Materials Chemistry A
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2022
·Vol. 10
·期 42
·22819-22833
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IF 14.511
Renzhi Xiong,Changcun Tang,Kunjiao Li,Jiabao Wan,Weifeng Jia,Yanhe Xiao,Baochang Cheng,Shuijin Lei
It is an effective method to promote the activity of photocatalysts by exploiting their own photothermal effects to increase the temperature of the reaction center and thus accelerate the kinetic process of photocatalysis. In this study, for the first time, a CoCr2O4/g-C3N4 composite photocatalyst is designed through the construction of CoCr2O4 nanoparticles decorated tremella-like porous g-C3N4. On the one hand, the type-II heterostructure can be formed and effectively improves the separation efficiency of photogenerated carriers. On the other hand, the photothermal effect of plasmonic CoCr2O4 nanoparticles can significantly increase the temperature of the reaction system, thereby enhancing the photocatalytic efficiency. CoCr2O4 nanoparticles exhibit a broad-band strong absorption in the near-infrared region. Under full spectrum illumination for 300 s, their surface temperature can be increased by 113 °C, demonstrating excellent photothermal properties. Although the bare CoCr2O4 nanoparticle sample does not show the photocatalytic activity of water splitting for hydrogen evolution, the optimized g-C3N4/CoCr2O4 heterostructure composite exhibits an average hydrogen production rate as high as 1525.1 μmol g−1 h−1 under UV-Vis-IR illumination, which is 4.0 and 5.8 times higher than that of bare g-C3N4 under UV-Vis-IR and UV-Vis light illumination, respectively. This work provides a new guide for designing novel photothermal-assisted photocatalytic composite materials.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Ting-Ting Zhang,Jian-Dong Song,Jia-Xi Chen,Ai-Ping Jia,Meng-Fei Luo,Ji-Qing Lu
A series of supported CoCr 2 O 4 /TUD-1 catalysts with different loadings were prepared and tested for catalytic combustion of dichloromethane, in order to investigate the effect of particle size on the catalyst properties and related catalytic behaviors. It was found that the supported catalyst with low content of CoCr 2 O 4 had smaller CoCr 2 O 4 particles compared to that with high content, as revealed by the XRD results. Consequently, the changes in particle size altered the surface composition of the catalyst, as the small particles contained higher content of surface Cr 6+ species compared to the large ones. The enrichment of Cr 6+ species improved catalyst reducibility and surface acidity, which synergistically governed the observed catalytic behaviors. As a reuslt, the 5CoCr 2 O 4 /TUD-1 catalyst had the highest reaction rate of 64.8 × 10 −7 molDCM g −1 CoCr2o4s −1 , due to its best reducibility and highest surface acidity.
研究领域:
化学工程
·
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
De-Rui Kong,Yu-Ying Xin,Xian-Fa Zhang,Zhao-Peng Deng,Li-Hua Huo,Shan Gao
The development of a non-enzymatic electrochemical sensor possessing well dual-sensing to H 2 O 2 and glucose remains challenging due to less report. Herein, spinel CoCr 2 O 4 nanoparticles with small size were synthesized by sol–gel reaction, which were then simply mixed with commercial graphene under ultrasonic to obtain uniformly dispersed CoCr 2 O 4 /Graphene composite. They were deposited onto the surface of bare glassy carbon electrode (GCE) through a common drop-coating method. The CoCr 2 O 4 /Graphene/GCE sensor firstly achieves highly dual-sensing to H 2 O 2 and glucose in 0.1 M NaOH solution. At 0.4 and 0.55 V, its sensitivities to H 2 O 2 and glucose can separately reach up to 1168.6 and 1722.5 μA mM −1 cm −2 , and the corresponding detection limits are as low as 18 nM and 12 nM. These key indexes are the best among reported dual-functional spinel oxide-based electrodes. This excellent electrochemical sensing ability stems from its large electrode active area, good conductivity, and the synergism between graphene and CoCr 2 O 4 nanoparticles with mixed redox couplings, which provides an efficient platform for dual-sensing detection. In addition, the modified electrode can accurately determine glucose in human tears, rat serum and orange juice, as well as H 2 O 2 in milk whey, mouthwash and disinfectant, thus predicting its good application prospects.
研究领域:
电化学传感器
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材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Qingfeng Zhou,Junzheng Wang,Rurong Zheng,Yun Gong,Jianhua Lin
Two chromite spinel-based composite materials, Mn II Cr III 2 O 4 /Mn II Mn III 2 O 4 /C and CoCr 2 O 4 /C are successfully synthesized by a solid-state conversion process via annealing Mn Cr-coordination compound and Co Cr-coordination compound at 350 °C in air for 1 h, respectively. The two composite materials both show the morphology of nanoparticles , in which the spinels are embedded in carbon matrix into a continuous phase. The as-prepared composite materials are used as supercapacitor electrodes in basic electrolyte. The Mn II Cr III 2 O 4 /Mn II Mn III 2 O 4 /C composite material possesses a high specific capacity of 184.0 mAh g −1 at a current density of 0.5 A g −1 with a superior rate capability of 138.3 mAh g −1 (75.2% retention) at 20 A g −1 . Meanwhile, CoCr 2 O 4 /C nanoparticles also deliver a high specific capacity of 158.8 mAh g −1 at a current density of 0.5 A g −1 with a superior rate capability of 125.0 mAh g −1 (78.7% retention) at 20 A g −1 . The good supercapacitive behaviors of the two composite materials are probably attributed to the characteristics of bimetallic compound and the presence of multiple valence states in the samples, giving rise to obvious redox responses. And the Mn II Cr III 2 O 4 /Mn II Mn III 2 O 4 /C and CoCr 2 O 4 /C composites possess reversible electrochromism .
研究领域:
材料科学
·
电化学
✓ 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）