Environmental Science-Nano
·
2020
·Vol. 7
·期 8
·2267-2277
·
IF 7.683
Qian Zhou,Qingyun Shi,Najun Li,Dongyun Chen,Qingfeng Xu,Hua Li,Jinghui He,Jianmei Lu
Coupling the piezoelectric effect of piezoelectric semiconductors with the photocatalytic technique is considered as a promising strategy for suppressing the recombination of photogenerated charge carriers. A new piezo-photocatalyst, a Rh-doped SrTiO3 inverse opal, was prepared by a hard-template method. Doping of photoactive Rh3+ played a significant role in improving the visible-light response ability and piezo-/photocatalytic activity of SrTiO3. In addition, the introduction of 3D ordered inverse opal structure was favourable for light harvesting. Co-excited by solar energy (visible light) and mechanical energy (ultrasonic vibration), the Rh-doped SrTiO3 inverse opal showed a significantly enhanced degradation rate of bisphenol A, which was 8.9 times higher than that of SrTiO3 nanoparticles under visible light only. The boosted piezo-photocatalytic efficiency was ascribed to the efficient separation of photogenerated electron–hole pairs under the acceleration of the built-in piezoelectric field in the Rh-SrTiO3 inverse opal, as confirmed by piezoelectric force microscopy (PFM). Therefore, this work provided a new insight into SrTiO3-based piezo-photocatalytic materials for efficient environmental remediation.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
DOI
高影响因子
LANGMUIR
·
2022
·
IF 4.331
Yafeng Wang,Xian Luo,Wenjie Lu,Bin Huang,Yanqing Yang
In this study, β-Ni(OH)2 with a unique flower-like morphology was synthesized through a hydrothermal method. The doping of Rh in β-Ni(OH)2 was achieved by a reduction method. The as-synthesized catalysts were characterized by X-ray diffraction, transmission electron microscopy, and X-ray photoelectron spectroscopy for the crystal structure, morphology, composition, and chemical state analysis. The electrochemical tests revealed that the doping of Rh can significantly increase the electrocatalytic performance of β-Ni(OH)2 in 1.0 M KOH solution. The methanol oxidation peak current density of Rh-doped β-Ni(OH)2 reached 95 mA cm–2 with a Tafel slope of 40 mV dec–1. The reason for these improvements is that Rh can suppress the phase transformation of NiOOH from β to α. Meanwhile, the electronic structure change of nickel in β-Ni(OH)2 and the defect ratio increase caused by Rh doping are beneficial to methanol oxidation reaction (MOR) catalytic activity. Furthermore, the synergistic effect between Rh and Ni(OH)2 improved the surface activity of β-NiOOH. The doping of Rh in β-Ni(OH)2 is initiative in this work, which provides a new strategy to design highly efficient and cost-effective MOR electrocatalysts for alkaline DMFCs.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2020
·
IF 7.1
Ao Liu,Siyuan Lv,Lianjing Zhao,Fangmeng Liu,Jing Wang,Rui You,Zijie Yang,Junming He,Li Jiang,Chenguang Wang,Xu Yan,Peng Sun,Geyu Lu
In this work, polyaniline (PANI) coated Rh-doped SnO 2 hollow nanotubes (PRS) were synthesized via electrostatic spinning and in-situ polymerization technique. The obtained samples were characterized by X-ray diffractometer, Field emission scanning electron microscopy, Transmission electron microscopy, X-ray photoelectron spectroscopy and Brunauer-Emmett-Teller. The gas sensing performances of the sensors based on PRS nanotubes were investigated systematically at room temperature. It was shown that the polyaniline coated 0.5 mol% Rh-doped SnO 2 nanotube (PRS0.5) sensor exhibited the highest response value of 13.6 to 100 ppm NH 3 at room temperature with excellent selectivity, acceptable repeatability and favorable flexibility. The enhanced gas sensing performances were due to the morphology structure, the heterojunction between PANI and Rh-SnO 2 and the catalytic effect of Rh 2 O 3 . Thus, the PANI coated Rh-doped SnO 2 hollow nanotubes could be a promising candidate for designing and fabricating flexible NH 3 gas sensor at room temperature.
研究领域:
材料科学
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2019
·Vol. 29
·期 32
·1902101
·
IF 15.621
Yaping Zhang,Yang Li,Diqing Ni,Zhiwei Chen,Xiao Wang,Yuyu Bu,Jin-Ping Ao
In this work, a water splitting photoanode composed of a BiVO 4 thin film surface modified by the deposition of a rhodium (Rh)-doped SrTiO 3 perovskite is fabricated, and the Rh-doped SrTiO 3 outer layer exhibits special photoelectrochemical (PEC) oxygen evolution co-catalytic activity. Controlled intensity modulated photo-current spectroscopy, electrochemical impedance spectroscopy, and other electrochemical results indicate that the Rh on the perovskite provide an oxidation active site during the PEC water oxidation process by reducing the reaction energy barrier for water oxidation. Theoretical calculations indicate that the water oxidation reaction is more likely to occur on the (110) crystal plane of Rh-SrTiO 3 because the oxygen evolution reaction overpotential on the (110) crystal plane is reduced significantly. Therefore, the obtained BiVO 4 /Rh5%-SrTiO 3 photoanode exhibits an optimized PEC performance. In particular, it facilitates the saturation of the photocurrent density. Thus, the presence of doped Rh in SrTiO 3 can reduce the amount of noble metals required while achieving excellent and stable oxygen evolution properties.
研究领域:
材料科学
·
电化学
·
能源转换
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Liang Li,Yongwei Lu,Xiaowei Liu,Xinran Wang,Siyue Zhou
Petal-like ultra-evenly Rh-doped Co 2 Fe-P composite was fabricated by a solvothermal and in-situ phosphorization strategy. Through doping a small amount of Rh within the Co 2 Fe-P structure, the catalytic activities of the composite for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) could be highly improved, and an excellent electrochemical bifunctional catalyst could be achieved. Under acidic reaction conditions, it only required an overpotential of 76 mV for HER to achieve a current density of 10 mA·cm −2 . Meanwhile, excellent electrochemical performance could also be obtained in alkaline electrolytes . The overpotential was 48 mV for HER and 303 mV for OER at 10 mA·cm −2 in 1 M KOH, respectively. Impressively, as a bifunctional electrode, the Rh doped Co 2 Fe-P composite can release a current density of 10 mA·cm −2 at a low cell voltage of 1.54 V in 1 M KOH for overall water splitting, which could be compared with that using commercial noble metal catalysts.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2023
·Vol. 14
·期 1
·1-10
·
IF 16.6
Wang Yi,Yang Rong,Ding Yajun,Zhang Bo,Li Hao,Bai Bing,Li Mingrun,Cui Yi,Xiao Jianping,Wu Zhong-Shuai
Exploring durable electrocatalysts with high activity for oxygen evolution reaction (OER) in acidic media is of paramount importance for H 2 production via polymer electrolyte membrane electrolyzers, yet it remains urgently challenging. Herein, we report a synergistic strategy of Rh doping and surface oxygen vacancies to precisely regulate unconventional OER reaction path via the Ru–O–Rh active sites of Rh-RuO 2 , simultaneously boosting intrinsic activity and stability. The stabilized low-valent catalyst exhibits a remarkable performance, with an overpotential of 161 mV at 10 mA cm −2 and activity retention of 99.2% exceeding 700 h at 50 mA cm −2 . Quasi in situ/operando characterizations demonstrate the recurrence of reversible oxygen species under working potentials for enhanced activity and durability. It is theoretically revealed that Rh-RuO 2 passes through a more optimal reaction path of lattice oxygen mediated mechanism-oxygen vacancy site mechanism induced by the synergistic interaction of defects and Ru–O–Rh active sites with the rate-determining step of *O formation, breaking the barrier limitation (*OOH) of the traditional adsorption evolution mechanism.
研究领域:
材料科学
·
电化学
·
催化
·
能源材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）