查找使用阿拉丁产品的科研文献

Construction of an S-scheme ZnMn2O4/CdO heterojunction for enhanced photocatalytic hydrogen evolution

Guangling Zuo,Hongyong Ye,Xingda Zhang,Rong Wang,Jia Du,Xin Ding

Photocatalytic hydrogen evolution represents a promising strategy for sustainable energy conversion, yet its efficiency is often limited by the rapid recombination of photogenerated carriers and insufficient redox capabilities. In this work, an S-scheme ZnMn 2 O 4 /CdO (ZMO/CdO) heterojunction was successfully fabricated via a simple solvothermal method to address these challenges. Based on band structure analysis, the composite satisfies the thermodynamic prerequisites for photocatalytic hydrogen evolution. The establishment of an S-scheme charge transfer pathway, driven by the combined effect of an internal electric field (IEF) and band bending, enables photogenerated electrons (e − ) to accumulate in the conduction band (CB) of ZnMn 2 O 4 (ZMO), while holes (h + ) are retained in the valence band (VB) of CdO. This mechanism not only promotes the spatial separation of photogenerated electron–hole pairs (PEHP) but also preserves the strongest redox ability of the system. Under optimized conditions (pH = 8 with triethanolamine (TEOA)), the ZMO/CdO composite achieves an outstanding hydrogen evolution rate of 2237 μmol∙g −1 ∙h −1 , which is approximately 4.38 and 2.84 times higher than that of pure CdO and ZMO, respectively. Moreover, the photocatalyst maintains high hydrogen production activity and structural stability in diverse real water samples, including municipal water, natural surface water, and even wastewater, highlighting its strong potential for practical solar-driven hydrogen production in complex environments.

The effect of Ni doping on the thermoelectric transport properties of CdO ceramics

Linjie Gao,Shufang Wang,Ran Liu,Shengjun Zhai,Hongrui Zhang,Jianglong Wang,Guangsheng Fu

Cd 1-x Ni x O ceramics were synthesized by the conventional solid state reaction method and the effect of Ni doping on the thermoelectric performance of CdO was investigated. The introduction of Ni led to dramatic changes in the electrical transport behaviors of CdO ceramics and thus an improvement in power factor, which were suggested to be related to the widening of the band gap as well as the formation of an impurity level in the band gap of CdO after the substitution of Ni 2+ for Cd 2+ . Doping of Ni also had a significant influence on the microstructure of CdO along with the development of NiO second phase when the Ni concentration exceeded 1%, which effectively suppressed the heat transfer by enhanced phonon scattering. Benefiting from the improved power factor and the reduced thermal conductivity , a high ZT of 0.43 was achieved in the Cd 0.99 Ni 0.01 O sample at about 1000 K.

Comparative investigation of physical, X-ray and neutron radiation shielding properties for B2O3-MnO2-CdO borate glasses

Jiale Wu,Jin Hu,Zhongshan Deng,Yongjin Feng,Hongtao Fan,Zhiyi Wang,Kaijun Wang,Qingming Chen,Weijun Zhang

B 2 O 3 -MnO 2 -CdO ternary oxide glasses with amorphous properties were synthesised using the melt-quenching method. Structural and physical property analyses showed that the amount of non-bridging oxygen and the system stiffness increases, and the oxide network filling is more tightly packed as cadmium oxide (CdO) gradually replaces manganese Oxide (MnO 2 ) in the glass. The radiation-shielding performance of the B 2 O 3 -MnO 2 -CdO glasses was evaluated using the shielding parameters calculated by the MCNPX simulation and the Phy-X program. Glasses with 40% and 50% CdO loading exhibited an average specific lead equivalent (PbE) of 0.241 and 0.294 mmPb/mm in the medical X-ray diagnostic area at 0.03–0.08 MeV; thus, they could fully meet the specific PbE requirements for application as "protection devices against diagnostic medical X-radiation". Furthermore, their photon attenuation capability is superior to that of various commercial shielding glasses in fast-neutron nuclear applications at 1°–10 3  MeV. In addition, compared to the borate glass systems studied in the literature, B 2 O 3 -MnO 2 -CdO glasses have fast neutron removal cross-sections of 0.125 cm −1  at a smaller density of 3.9043–4.8135 g/cm 3 , making them potentially excellent fast neutron absorbers.

A Comparative Study of Supported Sulfonic Acids Derived from CdO and CaO for the Reactive Adsorption of o-Xylene

Hongmei Wang,Xiaoxu Zhang,Yifei Niu,Zichuan Ma

The recovery and control of volatile organic compounds (VOCs) have gained significant attention. Supported sulfonic acid materials show potential in converting aromatic VOCs into non-volatile sulfonic acid derivatives. However, their effectiveness is closely tied to the anchoring state of the sulfonic acid groups. In this study, two supported sulfonic acids, SSA@CdO and SSA@CaO, were synthesized via the respective reactions of CdO and CaO with chlorosulfonic acid to investigate how the properties of the supports influence sulfonic acid anchoring and reactivity towardo-xylene. Comprehensive characterization and performance tests revealed that sulfonic acid groups on CdO were covalently bonded, forming positively charged sites ([O0.5Cd–O]ɗ−–SO3Hɗ+) with high loading (9.7 mmol/g), enabling excellento-xylene removal (≥95.6%) and adsorption capacity (51.67–91.59 mg/g) at 130–150 °C. In contrast, ion-paired bonding on CaO formed negatively charged sites ([O0.5Ca]+:OSO3H−), which were inactive in electrophilic sulfonation. This work provides new insights for enhancing supported sulfonic acid materials in VOC treatment.

Low cost ZnO/CdO thin films effectively reduce blue light-induced damage to RPE cells by display and lighting devices

Yanan Yang,Yi Li,Luqiao Yin,Longlong Chen,Jianhua Zhang

Enhanced Hydrogen Production over C-Doped CdO Photocatalyst in Na 2 S/Na 2 SO 3 Solution under Visible Light Irradiation

Quan Gu,Huaqiang Zhuang,Jinlin Long,Xiaohan An,Huan Lin,Huaxiang Lin,Xuxu Wang

The C-doped CdO photocatalysts were simply prepared by high-temperature solid-state process. The as-prepared photocatalysts were characterized by X-ray powder diffraction (XRD), diffuse reflectance spectroscopy (UV-Vis DRS), scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The results demonstrated that the carbon was doped into CdO, resulting in the red-shift of the optical absorption of CdO. The photocatalytic behavior of CdO and C-doped CdO was evaluated under the visible light irradiation by using the photocatalytic hydrogen evolution as a model reaction. The C-doped CdO photocatalysts had higher photocatalytic activity over parent CdO under visible light irradiation. The results indicated that the H2 production was due to the existence of CdS and the enhancement of visible light photocatalytic activity of H2 production was originated from the doping of carbon into the CdO lattice. The probably reaction mechanism was also discussed and proposed.

Surface-Enhanced Raman Scattering (SERS) on Indium-Doped CdO (ICO) Substrates: A New Charge-Transfer Enhancement Contribution from Electrons in Conduction Bands

Meng Zhang,Yanan Wang,Xu Wang,Bing Zhao,Weidong Ruan

Surface-enhanced Raman scattering (SERS) substrates have shown rapid development in recent years, but the use of transparent conductive oxides (TCOs) in SERS is still limited. Here, a series of In-doped CdO (ICO) NPs with different In3+ doping contents x (x = 0, 0.025, 0.050, 0.075, 0.100, 0.125, 0.150, and 0.200) were synthesized by a hydrothermal method and first employed as a SERS platform. The structures and properties of the ICO NPs influenced by dopant concentration of In3+ ions were characterized by powder X-ray diffraction (XRD), inductively coupled plasma (ICP) analysis, scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and Fourier transform infrared (FTIR) spectroscopy. Furthermore, the SERS spectra of ICO-MPY were investigated. Interestingly, the enhancement was dominated by the charge-transfer (CT) contribution through the free electrons in conduction bands (CBs). The changes in electronic distributions in energy levels of ICO NPs at different doping contents were explored, and the corresponding effect on SERS was discussed by employing 633 and 785 nm excitation lines, respectively. The CT route was found to be the excitation of electrons from CBs of semiconductor to the LUMO of molecule, which provides a new perspective in understanding SERS mechanisms. The present work provides a new approach to develop potential semiconductive SERS substrates.