Tingting Zhou

Guangzhou University

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Tong Zhang

Jilin University

Rui Zhang

Zhengzhou University

Lili Wang

Institute of Semiconductors

Shuang Cao

Qingdao University

Ning Sui

Zhejiang Chinese Medical University

Zheng Lou

Institute of Semiconductors

Jianan Deng

University of California, Santa Barbara

Peng Zhang

Shanghai Jiao Tong University

Dawen Zeng

Huazhong University of Science and Technology

Congyi Wu

China University of Geosciences (Beijing)

Cooperative Institutions

Chinese Academy of Sciences

Jilin University

Huazhong University of Science and Technology

State Key Laboratory on Integrated Optoelectronics

University of Chinese Academy of Sciences

Zhejiang University

Jilin Medical University

Peking University

University of Science and Technology of China

Sun Yat-sen University

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Colossal barocaloric effect of phase-change fatty acids

Applied Physics Letters (2024)

Tingjiao Xiong Jianchao Lin Tingting Zhou Guoyou Shi Tingting Ye

Materials exhibiting caloric effects can serve as green alternatives in place of the gas refrigerants used in traditional vapor refrigeration systems, which are facing rising energy usage and environmental issues. This study investigates the barocaloric effect of fatty acids, which are typical phase-change materials. Fatty acids exhibit a reversible isothermal entropy change of about 600 J kg−1 K−1 and an adiabatic temperature change of about 10 K at a pressure less than 60 MPa, resulting from the pressure-driven liquid–solid phase transition. In the solid state, the adiabatic temperature change of fatty acids is larger than that of the n-alkanes with similar transition temperatures. Raman analysis indicates that the population of the distorted molecular chains in fatty acids is remarkably decreased when they are transformed from liquid to solid state, leading to the colossal entropy change. For solid fatty acids, the intermolecular interactions characterized by the hydrogen bonds are significantly strengthened under pressure, which explains their large adiabatic temperature change. This study suggests fatty acids are promising refrigerants for eco-friendly barocaloric cooling.

Isothermal process

10.1063/5.0217663

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Advanced 3D ordered electrodes for PEMFC applications: From structural features and fabrication methods to the controllable design of catalyst layers

Green Energy & Environment (2023)

Kaili Wang Tingting Zhou Zhen Cao Zhimin Yuan Hongyan He

The catalyst layers (CLs) electrode is the key component of the membrane electrode assembly (MEA) in proton exchange membrane fuel cells (PEMFCs). Conventional electrodes for PEMFCs are composed of carbon-supported, ionomer, and Pt nanoparticles, all immersed together and sprayed with a micron-level thickness of CLs. They have a performance trade-off where increasing the Pt loading leads to higher performance of abundant triple-phase boundary areas but increases the electrode cost. Major challenges must be overcome before realizing its wide commercialization. Literature research revealed that it is impossible to achieve performance and durability targets with only high-performance catalysts, so the controllable design of CLs architecture in MEAs for PEMFCs must now be the top priority to meet industry goals. From this perspective, a 3D ordered electrode circumvents this issue with a support-free architecture and ultrathin thickness while reducing noble metal Pt loadings. Herein, we discuss the motivation in-depth and summarize the necessary CLs structural features for designing ultralow Pt loading electrodes. Critical issues that remain in progress for 3D ordered CLs must be studied and characterized. Furthermore, approaches for 3D ordered CLs architecture electrode development, involving material design, structure optimization, preparation technology, and characterization techniques, are summarized and are expected to be next-generation CLs for PEMFCs. Finally, the review concludes with perspectives on possible research directions of CL architecture to address the significant challenges in the future.

CLs upper limits

10.1016/j.gee.2023.11.002

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Metal–Organic Frameworks-Derived Hierarchical Co₃O₄ Structures as Efficient Sensing Materials for Acetone Detection

ACS Applied Materials & Interfaces (2018)

Rui Zhang Tingting Zhou Lili Wang Tong Zhang

Highly sensitive and stable gas sensors have attracted much attention because they are the key to innovations in the fields of environment, health, energy savings and security, etc. Sensing materials, which influence the practical sensing performance, are the crucial parts for gas sensors. Metal-organic frameworks (MOFs) are considered as alluring sensing materials for gas sensors because of the possession of high specific surface area, unique morphology, abundant metal sites, and functional linkers. Herein, four kinds of porous hierarchical Co3O4 structures have been selectively controlled by optimizing the thermal decomposition (temperature, rate, and atmosphere) using ZIF-67 as precursor that was obtained from coprecipitation method with the co-assistance of cobalt salt and 2-methylimidazole in the solution of methanol. These hierarchical Co3O4 structures, with controllable cross-linked channels, meso-/micropores, and adjustable surface area, are efficient catalytic materials for gas sensing. Benefits from structural advantages, core-shell, and porous core-shell Co3O4 exhibit enhanced sensing performance compared to those of porous popcorn and nanoparticle Co3O4 to acetone gas. These novel MOF-templated Co3O4 hierarchical structures are so fantastic that they can be expected to be efficient sensing materials for development of low-temperature operating gas sensors.

Coprecipitation

10.1021/acsami.7b17669

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Selective ppb-level ozone gas sensor based on hierarchical branch-like In2O3 nanostructure

Sensors and Actuators B Chemical (2021)

Ning Sui Peng Zhang Tingting Zhou Tong Zhang

Nanomaterials

Rod

10.1016/j.snb.2021.129612

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Identification of Multiple Parameters of the Bammann–Chiesa–Johnson Constitutive Model with Comprehensive Experiments for Pure Aluminum

Journal of Materials Engineering and Performance (2020)

Tingting Zhou Gang Wang Yang Yang Yao Li Maobing Shuai

Viscoplasticity

Flow stress

Decoupling (probability)

10.1007/s11665-020-04584-5

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Carbon materials-functionalized tin dioxide nanoparticles toward robust, high-performance nitrogen dioxide gas sensor

Journal of Colloid and Interface Science (2018)

Rui Zhang Xiupeng Liu Tingting Zhou Lili Wang Tong Zhang

Tin dioxide

Nitrogen dioxide

Carbon fibers

10.1016/j.jcis.2018.04.015

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Hybrid Co₃O₄/SnO₂ Core–Shell Nanospheres as Real-Time Rapid-Response Sensors for Ammonia Gas

ACS Applied Materials & Interfaces (2016)

Lili Wang Zheng Lou Rui Zhang Tingting Zhou Jianan Deng

Novel hybrid Co3O4/SnO2 core–shell nanospheres have been effectively realized by a one-step hydrothermal, template-free preparation method. Our strategy involves a simple fabrication scheme that entails the coating of natural cross-link agents followed by electrostatic interaction between the positive charges of Sn and Co ions and the negative charge of glutamic acid. The core–shell architecture enables novel flexibility of gas sensor surfaces compared to commonly used bulk materials. The highly efficient charge transfer and unique structure are key to ensuring the availability of high response and rapid-response speed. It demonstrates how hybrid core–shell nanospheres can be used as an advance function material to fabricate electrical sensing devices that may be useful as gas sensors.

10.1021/acsami.6b00305

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Shape control and selective decoration of Zn2SnO4 nanostructures on 1D nanowires: Boosting chemical–sensing performances

Sensors and Actuators B Chemical (2019)

Tingting Zhou Xiupeng Liu Rui Zhang Yubing Wang Tong Zhang

Nanomaterials

Nanorod

10.1016/j.snb.2019.03.048

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Constitutive Model Research on Pure Aluminum Considering Dynamic Recovery and Recrystallization

Tingting Zhou Yang Yang Maobing Shuai

The article introduces some main constitutive models of pure aluminum with regard to mechanical response, dynamic recovery and recrystallization during the process of severe plastic deformation.Two kinds of constitutive models will be introduced in this paper, because there are few models considering two aspects simultaneously, that is, material deformation dynamics and microstructure evolution.In the case of deformation dynamics, the JC model, the ZA model, the power exponent function model will be introduced in detail; in view of microstructure evolution, the M. Zhou explicit dynamic constitutive model, a model considering dynamic recrystallization will be introduced in detail.At last, this paper will present the BCJ constitutive model specially, which has superiority at macro level and micro level, and has been widely used abroad.An analysis of the characteristics of these models, and scope of application of each model, comparison between each model as well as the common problems of these models will be summarized.Furthermore, the article will exhibit some characteristics of pure aluminum and the reasons for selecting the BCJ constitutive model to describe the deformation mechanisms of pure aluminum during single point diamond cutting.

Recrystallization (geology)

Dynamic Recrystallization

10.2991/icmit-16.2016.135

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Catalytic Activation of Cobalt Doping Sites in ZIF-71-Coated ZnO Nanorod Arrays for Enhancing Gas-Sensing Performance to Acetone

ACS Applied Materials & Interfaces (2020)

Tingting Zhou Shiyu Chen Xiaoxia Wang Changsheng Xie Dawen Zeng

Developing acetone gas sensors with high sensitivity is crucially important for many applications including nonevasive diagnosis of diabetes. In the present work, cobalt doping is used to catalyze acetone gas-sensing reactions and hence to promote the sensitivity of acetone gas sensors. In order to achieve this, ZIF-71 metal–organic framework (MOF) is synthesized onto ZnO nanorod arrays with various concentrations of Co doping to form composite ZnO@ZIF-71(Co) sensors, which are then evaluated as sensing materials for acetone detection. Such sensors are shown to be sensitive to a trace amount of acetone (50 ppb) and have a massively enhanced response of about 100 times that for the undoped sensor at an optimal Co/Zn ratio and operating temperature. Fourier-transform infrared spectroscopy and temperature-programmed desorption with density functional theory calculations are also made to assist in elucidating the catalytic gas-sensing mechanism for the Co-doped composite sensors ZnO@ZIF-71(Co). It demonstrated that the introduced Co site in ZIF-71(Co) can activate oxygen catalytically and increase active oxygen released to the ZnO surface. Meanwhile, the Co sites also promote the decomposition of acetone. These two steps together affect the catalytic oxidation of gases and finally enhance the sensitivity. This work introduces the catalytic effect of the MOF into the gas-sensing mechanism and provides an idea for broadening the application of MOF catalysis.

Nanorod

Nanomaterials

10.1021/acsami.0c13089

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Citations (60)