Guanghui Zhang

Dalian University of Technology

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Jeffrey T. Miller

Purdue University West Lafayette

Xinwen Guo

Dalian University of Technology

Chunshan Song

Chinese University of Hong Kong

Aiwen Lei

Wuhan University

Jie Zhu

Dalian University of Technology

Ge Sang

China Academy of Engineering Physics

Zhenwei Wu

Shenzhen Bay Laboratory

Mingrui Wang

Peking University

Wei Liu

University of Chinese Academy of Sciences

A. Jeremy Kropf

Argonne National Laboratory

Cooperative Institutions

Chinese Academy of Sciences

242

Dalian University of Technology

134

University of Chinese Academy of Sciences

102

Shanghai Jiao Tong University

Dalian University

University of Science and Technology of China

Sichuan University

Wuhan University

China Academy of Engineering Physics

Tsinghua University

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Fabrication and experimental validation of a full-scale depleted uranium bed with thin double-layered annulus configuration for hydrogen isotopes recovery and delivery

Energy (2015)

Huaqin Kou Wenhua Luo Zhiyong Huang Ge Sang Daqiao Meng

Depleted Uranium

10.1016/j.energy.2015.07.097

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Citations (16)

Intermetallic Compounds as an Alternative to Single‐atom Alloy Catalysts: Geometric and Electronic Structures from Advanced X‐ray Spectroscopies and Computational Studies

ChemCatChem (2019)

Evan C. Wegener Brandon C. Bukowski Dali Yang Zhenwei Wu A. Jeremy Kropf

Abstract Pt−Fe intermetallic compound (IMC) catalysts, including Pt 3 Fe, PtFe and PtFe 3 , are shown to have advantageous catalytic properties similar to those reported for single‐atom alloy catalysts. Suppresion of the Pt ensembles responsible for hydrogenolysis results in high olefin selectivity during propane dehydrogenation. In situ resonant inelastic X‐ray scattering (RIXS) results and density functional theory calculations show that these changes are associated with a decrease in the average energy of the filled 5d states of Pt in the Pt−Fe intermetallic compound structures compared to monometallic Pt, accompanied by an increase in the average energy of the unfilled valence bands. The decrease in energy of the filled Pt 5d orbitals increases with increasing Fe content in the IMC, i.e. PtFe 3 >PtFe>Pt 3 Fe. These results demonstrate that by altering the stoichiometry of IMC catalysts it is possible to control both the ensemble size and electronic properties of active sites, which affords another mechanism for tuning catalytic properties, in addition to changing promoter metals. The present study demonstrates the potential of ordered intermetallic compounds as an alternative to traditional solid‐solution single‐atom alloys to serve as catalysts with well‐defined and uniform active sites.

Hydrogenolysis

Stoichiometry

10.1002/cctc.201901869

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Citations (64)

Analysis of the overall solution of centralized and cluster inverter of large grid-connected photovoltaic power station in mountainous area

Guanghui Zhang Daguo Cheng

As the focus of modern society construction and development, large-scale grid-connected photovoltaic power station is also the energy utilization technology with the most development potential in the future. The one hand, can reduce the battery energy storage and release process, effectively control the wastage of the energy economy, on the other hand can improve the quality and efficiency of power station transmission power, effective control of the space and capital consumption, further promote social and economic development for the education. At present, in the large-scale construction and promotion of grid-connected photovoltaic power stations in mountainous areas of China, centralized or cluster inverter schemes are used. Although there are technical differences between them, their fundamental purpose is to ensure the safe and stable operation of power stations. Therefore, on the basis of understanding the current construction and development status of large grid-connected photovoltaic power stations in China, this paper makes a comparative analysis of the centralized and cluster inverter schemes to clarify the application differences of the two in large grid-connected photovoltaic power stations, so as to provide basic guarantee for future urban residents.

10.1117/12.2646630

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Citations (0)

Cu(II)–Cu(I) Synergistic Cooperation to Lead the Alkyne C–H Activation

Journal of the American Chemical Society (2014)

Ruopeng Bai Guanghui Zhang Hong Yi Zhiliang Huang Xiaotian Qi

An efficient alkyne C-H activation and homocoupling procedure has been studied which indicates that a Cu(II)/Cu(I) synergistic cooperation might be involved. In situ Raman spectroscopy was employed to study kinetic behavior, drawing the conclusion that Cu(I) rather than Cu(II) participates in the rate-determining step. IR, EPR, and X-ray absorption spectroscopy evidence were provided for structural information, indicating that Cu(I) has a stronger interaction with alkyne than Cu(II) in the C-H activation step. Kinetics study showed Cu(II) plays a role as oxidant in C-C bond construction step, which was a fast step in the reaction. X-band EPR spectroscopy showed that the coordination environment of CuCl2(TMEDA) was affected by Cu(I). A putative mechanism with Cu(I)-Cu(II) synergistic cooperation procedure is proposed for the reaction.

Alkyne

10.1021/ja5097489

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Citations (105)

In Situ Synthesis and Stabilization of Co2c for Co2 Hydrogenation to Valuable Hydrocarbon

SSRN Electronic Journal (2022)

Mingrui Wang Peng Wang Guanghui Zhang Yulong Liu Rongtan Li

Cobalt carbide (Co2C) is a promising catalyst in CO2 hydrogenation to commercial chemicals, whereas its facile synthesis and stabilization under reactions remain challenging, limiting its practical application. Herein, we report the in situ synthesis and stabilization of Co2C with K2CO3 modification during CO2 hydrogenation. Theoretical calculations elucidate that K enhances the accumulation of surface C atoms and the carburization. We demonstrate that carburization of cobalt oxide to Co2C is more facile than that of metallic cobalt and the stabilization of Co2C is dependent on the reaction atmosphere in conjunction with the K promoter. Notably, co-feeding 2 vol.% H2O can dramatically promote the carburization, as confirmed by in situ XRD and XPS analyses. The selectivity to C2+ products in hydrocarbons on Co2C reached 67.3% at 300 °C. This work provides a method to in situ synthesize Co2C and constitutes a fundamental understanding on its formation and stabilization in CO2 hydrogenation.

10.2139/ssrn.4186997

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CeO₂ Nanoparticles Boosted Fe‐N‐C Sites Derived from Dual Metal Organic Frameworks toward Highly Active and Durable Oxygen Reduction Reaction

Advanced Materials Interfaces (2022)

Chenxi Qiu Rui Gao Yizheng Guo Jiaqi Qin Guanghui Zhang

Abstract The durability improvement of Fe‐N‐C electrocatalysts toward acidic oxygen reduction reaction (ORR) remains a grand challenge. H 2 O 2 seriously degrades Fe‐N‐C sites, which account for a major origin of the low durability. Herein, the growth of hemin decorated zeolitic imidazole framework (hemin‐ZIF 8) on preformed Ce‐1,3,5‐benzenecarboxylic acid (Ce‐BTC) metal organic frameworks (MOFs) is reported. Interestingly, the resultant dual MOFs appear to be Ce‐BTC nanorods decorated with many hemin‐ZIF 8 dodecahedral nanocrystals, well resembling rice panicles. After pyrolysis, CeO 2 nanoparticles are evenly distributed in carbonized nanorods and abundant Fe‐N‐C sites are embedded in shrunk dodecahedra, labeled as Fe‐N‐C‐CeO 2 . Fe‐N‐C‐CeO 2 exhibits a high ORR activity in terms of a half wave potential (E 1/2 ) of 0.800 V (vs RHE). The high ORR activity is closely correlated with the well exposure of Fe‐N‐C sites. In addition, the presence of CeO 2 leads to a low H 2 O 2 yield of Fe‐N‐C‐CeO 2 (2.3%), much lower than that of Fe‐N‐C (4.3%) by itself in the absence of CeO 2 . After 5000 potential cycling, the E 1/2 of Fe‐N‐C‐CeO 2 degrades 15 mV superior to that of Fe‐N‐C (42 mV). Moreover, a single cell with Fe‐N‐C‐CeO 2 as cathode degrades much slower than that of Fe‐N‐C (28 000 s vs 7200 s) during chronoamperometric measurements.

Dodecahedron

Nanorod

Hemin

Zeolitic imidazolate framework

10.1002/admi.202200852

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Citations (10)

Thin carbon layer covered Co₄N cubes encapsulated in N-doped porous carbon nanocage as tri-functional catalysts with enhanced charge-transfer efficiency for Zn-air battery and overall water-splitting

Journal of Materials Chemistry A (2023)

Guanghui Zhang Lingxue Zhao Guangda Li Liqiang Xu

Co 4 N encapsulated in a porous nanocage as a tri-functional catalyst are designed, which exhibited high-efficiency activity and long-term durability toward ORR/OER. DFT analyses indicated the existence of Co–N–C as active sites in enhancing the RDS.

Nanocages

Carbon fibers

10.1039/d3ta01509b

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Citations (8)

Toward Efficient Carbon and Water Cycles: Emerging Opportunities with Single‐Site Catalysts Made of 3d Transition Metals

Advanced Materials (2019)

Gang Wan Guanghui Zhang Xiao‐Min Lin

Abstract Advances in the chemical and electrochemical transformation of carbon and water are vital for delivering affordable and environmentally friendly energy sources and chemicals. Central to this challenge is the performance of materials. Traditionally, noble metal particles or metal complexes have been used as catalysts for many reactions. Recently, 3d transition‐metal single‐site catalysts (3dTM‐SSCs) have emerged as potentially transformational candidates for the next‐generation high‐performance noble‐metal‐free catalysts. Designing catalysts at the molecular level can lead to a more efficient utilization of metal atoms and at the same time enhance catalytic performance under harsh reaction conditions. Despite this promise, several fundamental issues remain, in particular the structural evolution of 3dTM‐SSCs during the synthesis, the molecular‐level insights into the structure of the active sites, catalytic mechanisms, and the long‐term cycling stability. Here, the material chemistries that facilitate the 3dTM‐SSCs generation through a controlled pyrolytic synthesis are discussed, with focus on elucidating the underlying performance descriptors that can tune the catalytic properties in various critical reactions in carbon and water cycles. The current challenges and possible solutions for improving these novel catalytic materials are also highlighted.

Carbon fibers

Environmentally Friendly

Noble metal

10.1002/adma.201905548

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Citations (29)

Fine-Tuning the Active Phases of CoFe Alloy Carbides for Boosting Olefin Synthesis from CO₂ Hydrogenation

ACS Catalysis (2024)

Na Liu Qixiang Fan Jian Wei Guanghui Zhang Jian Sun

The rational design of highly efficient Co–Fe bimetallic catalysts is highly desirable for CO2 hydrogenation to olefins as an important alternative for traditional petroleum cracking technology. The treatment of carburization to construct the active phases stands out. Herein, the composition of active CoFe alloy carbide catalysts consisting of χ-(CoxFe1–x)5C2 and θ-(CoxFe1–x)3C phases was fine-tuned by altering the carburization environment. The synergistic effect between the dual components was optimized to improve the CO2 activation and C–C coupling capacity. The appropriate carburization degree and phase composition of CoFe alloy carbides are favorable for enhancing the space-time yield (STY) of C2+ olefins, up to 328.1 mg gcat–1 h–1 on the CoFe catalyst carburized in H2/CO = 2 at 320 °C for 8 h. This work provides useful guidelines for regulating product distribution in the design and synthesis of highly efficient catalysts.

Bimetallic strip

10.1021/acscatal.4c06112

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Citations (0)

High-Density Ultra-small Clusters and Single-Atom Fe Sites Embedded in Graphitic Carbon Nitride (g-C₃N₄) for Highly Efficient Catalytic Advanced Oxidation Processes

ACS Nano (2018)

Sufeng An Guanghui Zhang Tingwen Wang Wenna Zhang Keyan Li

Ultra-small metal clusters have attracted great attention owing to their superior catalytic performance and extensive application in heterogeneous catalysis. However, the synthesis of high-density metal clusters is very challenging due to their facile aggregation. Herein, one-step pyrolysis was used to synthesize ultra-small clusters and single-atom Fe sites embedded in graphitic carbon nitride with high density (iron loading up to 18.2 wt %), evidenced by high-angle annular dark field-scanning transmission electron microscopy, X-ray absorption spectroscopy, X-ray photoelectron spectroscopy, and 57Fe Mössbauer spectroscopy. The catalysts exhibit enhanced activity and stability in degrading various organic samples in advanced oxidation processes. The drastically increased metal site density and stability provide useful insights into the design and synthesis of cluster catalysts for practical application in catalytic oxidation reactions.

Graphitic carbon nitride

Carbon fibers

10.1021/acsnano.8b04693

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Citations (527)