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Tiantian Zhang

Bio: Tiantian Zhang is an academic researcher from Southeast University. The author has contributed to research in topics: Catalysis & Materials science. The author has an hindex of 1, co-authored 3 publications receiving 2 citations.

Papers
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Journal ArticleDOI
TL;DR: In this article , a series of CoP·xCoMoP heterostructured nanocages (NCs) were prepared via a dissolution-regrowth and subsequent phosphorization process using metal-organic frameworks (MOFs) as template.

21 citations

Journal ArticleDOI
TL;DR: MoC/MAPbIglesias as discussed by the authors has shown excellent hydrogen evolution rate performance under visible light by using the non-precious metal promoter MoC to modify MAPbI3, and provides a new idea for the synthesis of efficient MAP bI3-based composite catalysts.
Abstract: Metal halide perovskites, such as iodine methylamine lead (MAPbI3), have received extensive attention in the field of photocatalytic decomposition of HI for hydrogen evolution, due to their excellent photoelectric properties. In this paper, a new MAPbI3-based composite, MoC/MAPbI3, was synthesized. The results show that 15 wt% MoC/MAPbI3 has the best hydrogen production performance (38.4 μmol h−1), which is approximately 24-times that of pure MAPbI3 (1.61 μmol h−1). With the extension of the catalytic time, the hydrogen production rate of MoC/MAPbI3 reached 165.3 μmol h−1 after 16 h due to the effective separation and transfer of charge carriers between MoC and MAPbI3, showing excellent hydrogen evolution rate performance under visible light. In addition, the cycling stability of MoC/MAPbI3 did not decrease in multiple 4 h cycle tests. This study used the non-precious metal promoter MoC to modify MAPbI3, and provides a new idea for the synthesis of efficient MAPbI3-based composite catalysts.

10 citations

Journal ArticleDOI
TL;DR: In this article, 1T-2H MoSe2/MAPbI3 composites were obtained by simple electrostatic adsorption method, and the results of photocatalytic hydrogen production showed that 10 ¼wt% 1T 2 H MoSe 2/MAPBI3 performed the best hydrogen evolution rate of 552.93 μmol·h−1·g−1.

5 citations

Journal ArticleDOI
Xuanxuan Yang1, Hong Yang1, Tiantian Zhang1, Yongbing Lou1, Jinxi Chen1 
TL;DR: In this article, P-doped CdS nanorods (denoted as PCS) integrated with multiphasic MoSe2 nanosheets (1T/2H MoSe 2, marked as MS-T) were fabricated by a convenient ultrasonic approach.

5 citations

Journal ArticleDOI
TL;DR: In this article , Ni2P/UiO-66-(SCH3)2 composites were prepared by a simple solvothermal method and were fully characterized by XRD, SEM, TEM, HRTEM, EDS, and XPS methods.
Abstract: The UiO-66 family shows promising photocatalytic prospects in water splitting for hydrogen evolution under visible light irradiation due to its suitable band gap and adequate active sites. In this work, novel Ni2P/UiO-66-(SCH3)2 composites were prepared by a simple solvothermal method. These as-synthesized samples were fully characterized by XRD, SEM, TEM, HRTEM, EDS, and XPS methods. The effectiveness of visible light driven photocatalytic water-splitting to produce hydrogen was investigated in the presence of sacrificial agents. The results showed that the optimal hydrogen yield of 5 wt% Ni2P/UiO-66-(SCH3)2 is 3724.22 μmol g-1 h-1, reaching almost 187 times that of pristine UiO-66-(SCH3)2 (19.93 μmol g-1 h-1). Meanwhile, long term cycling stability tests also showed that Ni2P/UiO-66-(SCH3)2 composites present an excellent photocatalytic H2 production stability. Photoelectrochemical performance analysis revealed that the high catalytic activity of the composite materials could be associated with the synergistic effect of UiO-66-(SCH3)2 and Ni2P. Light stimulates UiO-66-(SCH3)2 to generate electrons and holes, and Ni2P as a cocatalyst could effectively transmit electrons and boost photogenerated charge separation. This work provides a reference for exploring UiO-66 family catalysts with good catalytic activity.

2 citations


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01 Sep 2016
TL;DR: Using novel porous (holey) metallic 1T phase MoS2 nanosheets synthesized by a liquid-ammonia-assisted lithiation route, this study systematically investigated the contributions of crystal structure, edges, and sulfur vacancies to the catalytic activity toward HER and revealed that the phase serves as the key role in determining the HER performance.
Abstract: Molybdenum disulfide (MoS2) is a promising nonprecious catalyst for the hydrogen evolution reaction (HER) that has been extensively studied due to its excellent performance, but the lack of understanding of the factors that impact its catalytic activity hinders further design and enhancement of MoS2-based electrocatalysts. Here, by using novel porous (holey) metallic 1T phase MoS2 nanosheets synthesized by a liquid-ammonia-assisted lithiation route, we systematically investigated the contributions of crystal structure (phase), edges, and sulfur vacancies (S-vacancies) to the catalytic activity toward HER from five representative MoS2 nanosheet samples, including 2H and 1T phase, porous 2H and 1T phase, and sulfur-compensated porous 2H phase. Superior HER catalytic activity was achieved in the porous 1T phase MoS2 nanosheets that have even more edges and S-vacancies than conventional 1T phase MoS2. A comparative study revealed that the phase serves as the key role in determining the HER performance, as 1T phase MoS2 always outperforms the corresponding 2H phase MoS2 samples, and that both edges and S-vacancies also contribute significantly to the catalytic activity in porous MoS2 samples. Then, using combined defect characterization techniques of electron spin resonance spectroscopy and positron annihilation lifetime spectroscopy to quantify the S-vacancies, the contributions of each factor were individually elucidated. This study presents new insights and opens up new avenues for designing electrocatalysts based on MoS2 or other layered materials with enhanced HER performance.

175 citations

Journal ArticleDOI
TL;DR: In this article , a sandwich-like anode was employed as anode material, in which heterostructured CoMoP2 and MoP nanoparticles were coated on N, P co-doped carbon matrix.
Abstract: Transition metal phosphides as ideal anodes have been attracted a large number of interests due to their excellent performance for lithium-ion batteries. Nevertheless, CoMoP2 materials were rarely reported as lithium-ion battery anode materials. Thereupon, to excavate their ability in LIBs, a sandwich-like architecture was employed as anode material, in which heterostructured CoMoP2 and MoP nanoparticles were coated on N, P co-doped carbon matrix. Notably, doped micro-lamellated carbon sheets could not only allow boosted lithium ion and electron transport but also alleviate the volume changes of active material to sustain anode integrity during the discharge/charge processes. More importantly, the combination of CoMoP2 and MoP nanoparticles could synergically strengthen the electrochemical activities of the anodes, and their built-in heterojunction facilitated the reaction kinetics on their interfaces. This research may offer a rational design on both heterostructure and doping engineering of future anodes for lithium-ion batteries.

73 citations

Journal ArticleDOI
TL;DR: In this paper , the catalytically inactive n-type CeOx is successfully combined with p-type CoP to form the CoP/CeOx heterojunction, which can promote the water dissociation and optimize H adsorption, synergistically boosting the electrocatalytic HER output.
Abstract: The modulation of the electronic structure is the effective access to achieve highly active electrocatalysts for the hydrogen evolution reaction (HER). Transition-metal phosphide-based heterostructures are very promising in enhancing HER performance but the facile fabrication and an in-depth study of the catalytic mechanisms still remain a challenge. In this work, the catalytically inactive n-type CeOx is successfully combined with p-type CoP to form the CoP/CeOx heterojunction. The crystalline-amorphous CoP/CeOx heterojunction is fabricated by the phosphorization of predesigned Co(OH)2/CeOx via the as-developed reduction-hydrolysis strategy. The p-n CoP/CeOx heterojunction with a strong built-in potential of 1.38 V enables the regulation of the electronic structure of active CoP within the space-charge region to enhance its intrinsic activity and facilitate the electron transfer. The functional CeOx entity and the negatively charged CoP can promote the water dissociation and optimize H adsorption, synergistically boosting the electrocatalytic HER output. As expected, the heterostructured CoP/CeOx-20:1 with the optimal ratio of Co/Ce shows significantly improved HER activity and favorable kinetics (overpotential of 118 mV at a current density of 10 mA cm-2 and Tafel slope of 77.26 mV dec-1). The present study may provide new insight into the integration of crystalline and amorphous entities into the p-n heterojunction as a highly efficient electrocatalyst for energy storage and conversion.

16 citations

Journal ArticleDOI
Önder Metin1
TL;DR: In this article , the use of 2D bismuthene as a photocatalyst in a liquid-phase organic transformation was reported for the first time, and a density functional theory (DFT) study revealed mechanistic details that lie behind the catalytic activity.
Abstract: Recently, layered two-dimensional (2D) semiconductor materials composed of group 15 elements (pnictogens) are demonstrated as efficient photocatalysts in various applications. However, only little attention is given to the investigation of their catalytic properties, and even there is no example of the photocatalytic application of bismuthene so far. Here we report for the first time on the use of 2D bismuthene as a photocatalyst in a liquid-phase organic transformation. 2D bismuthene is proven to be an efficient photocatalyst that can be operated under various reaction conditions including indoor light illumination, darkness, outdoors and low temperature for the photoredox C–H arylation of (hetero)arenes with high product yields. The presented bismuthene catalyzed photoredox C–H arylation protocol works efficiently on a broad substrate scope of (hetero)arenes with aryl diazonium salts bearing electron-withdrawing and electron-donating groups. Moreover, a density functional theory (DFT) study reveals mechanistic details that lie behind the catalytic activity of bismuthene.

11 citations

Journal ArticleDOI
TL;DR: In this article, the use of 2D bismuthene as a photocatalyst in a liquid-phase organic transformation was reported for the first time, and a density functional theory (DFT) study revealed mechanistic details that lie behind the catalytic activity.
Abstract: Recently, layered two-dimensional (2D) semiconductor materials composed of group 15 elements (pnictogens) are demonstrated as efficient photocatalysts in various applications. However, only little attention is to the investigation of their catalytic properties, and even there is no example of the photocatalytic application of bismuthene so far. Here we report for the first time on the use of 2D bismuthene as a photocatalyst in a liquid-phase organic transformation. 2D bismuthene is proven to be an efficient photocatalyst that can be operated under various reaction conditions including indoor light illumination, darkness, outdoors and low temperature for the photoredox C–H arylation of (hetero)arenes with high product yields. The presented bismuthene catalyzed photoredox C–H arylation protocol works efficiently on a broad substrate scope of (hetero)arenes with aryl diazonium salts bearing electron-withdrawing and electron-donating groups. Moreover, a density functional theory (DFT) study reveals mechanistic details that lie behind the catalytic activity of bismuthene.

11 citations