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Science China Chemistry 2021年第10期64卷 1716-1722页

作者： yuguang chao Weiyu Zhang Peng Zhou Hui Chen Shiyu Lu Menggang Li Qinghua Zhang Lin Gu Shaojun Guo School of Materials Science and Engineering Peking UniversityBeijing 100871China Institute of Physics Chinese Academy of SciencesBeijing 100190China Beijing Innovation Center for Engineering Science and Advanced Technology(BIC-ESAT) College of EngineeringPeking UniversityBeijing 100871China

Atomic sites co-catalyst (ASC) on photocatalytic materials possesses an attractive prospect to promote charge carrier separation and tune surface reaction kinetics,yet the synthesis of earth-abundant ASC under low temperature remains a great ***,a novel in-situ NH_(4)^(+)-etched strategy to anchor atomic Mo sites on ZnIn_(2)S_(4)hierarchical nanotubes (HNTs) with abundant mesopores under mild conditions for promoting charge carrier separation and enhancing light multi-reflections is developed for efficient photocatalytic H_(2) *** functional theory calculations and linear sweep voltammetry demonstrate that the well-defined Mo-S_(2)O_(1) sites with distinctive coordination configuration and electronic property contribute to the enhanced separation of photo-generated charge carriers and reduced Gibbs free energy for H_(2) ***,the well-defined MoSA-ZIS HNTs present an excellent photocatalytic activity with a rate of 29.9μmol h^(-1)(5.98 mmol g^(-1)h^(-1)),which is 7.3 times higher than that of ZnIn_(2)S_(4)nanosheets (NSs),to be among the best ZnIn_(2)S_(4)-based *** present strategy breaks the high-temperature limitation of conventional top-down thermal dissociation/emitting approach for anchoring non-noble metal atomic sites on catalyst support.

关键词： in-situ NH_(4)^(+)-etched hierarchical nanotubes Mo single atoms photocatalytic H_(2)evolution

Ultrathin PtRu Nanowires as Efficient and Stable Electrocatalyst for Liquid Fuel Oxidation Reactions

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Energy Material Advances 2022年第1期2022卷 223-230页

作者： Kun Yin yuguang chao Lingyou Zeng Menggang Li Fangze Liu Shaojun Guo Hongbo Li Beijing Key Laboratory of Construction-Tailorable Advanced Functional Materials and Green Applications School of Materials Science&EngineeringBeijing Institute of TechnologyBeijing 100081China School of Materials Science and Engineering Peking UniversityBeijing 100871China

Direct liquid fuel cells(DLFCs)are promising clean energy conversion devices for their high energy density,low environmental pollution,and convenient transportation and ***,the commercialization of DLFCs is still limited by the lack of highly active and stable catalysts for the anodic oxidation of liquid ***,a new class of ultrathin PtRu nanowires(NWs)with a diameter of 1.1nm was synthesized via a colloidal chemistry *** as-made ultrathin PtRu NWs can not only expose large active sites but also enhance the kinetics of methanol oxidation reaction,which was confirmed by the in situ Fourier transform infrared(FTIR)***,ultrathin PtRu NWs exhibit greatly boosted activity and stability for methanol and ethanol oxidation reactions in an alkaline medium.

关键词： spectroscopy. methanol catalyst

Amorphous Ru nanoclusters onto Co‐doped 1D carbon nanocagesenables efficient hydrogen evolution catalysis

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Chinese Journal of Catalysis 2022年第1期43卷 110-116页

作者： Wenxiu Yang Weiyu Zhang Rui Liu Fan Lv yuguang chao Zichen Wang Shaojun Guo School of Materials Science & Engineering Peking University Beijing 100871 China Advanced Research Institute of Multidisciplinary Science Advanced Technology Research Institute (Jinan) Key Laboratory of Cluster Science School of Chemistry and Chemical Engineering Beijing Institute of Technology Beijing 100081 China

析氢反应是电解水产制氢的关键反应之一.在碱性条件下,由于催化剂表面与反应过程中产生的氧物种、氢物种与催化剂的吸附未处于最佳状态,析氢反应动力学往往比较缓慢,比在酸性条件下慢2–3个数量级.目前,铂基纳米催化剂被认为是最优的析... 详细信息

析氢反应是电解水产制氢的关键反应之一.在碱性条件下,由于催化剂表面与反应过程中产生的氧物种、氢物种与催化剂的吸附未处于最佳状态,析氢反应动力学往往比较缓慢,比在酸性条件下慢2–3个数量级.目前,铂基纳米催化剂被认为是最优的析氢催化剂,但因价格昂贵、稳定性较差,限制了其在电解水器件上的大规模应用.因此,设计一种价格较为低廉、活性高和稳定性好的碱性析氢催化剂尤为必要.钌作为铂族金属之一,其价格约为铂的三分之一,但其与氢的结合能却与铂类似.因此,钌基催化剂被认为是有望替代铂作为析氢催化剂.本文结合模板法、静电纺丝和碳化热解策略构筑了一种负载无定型钌纳米簇的原子级钴掺杂一维碳纳米笼催化剂,有效提升了碱性条件下析氢反应性能.该催化剂具有较高的比表面积,丰富的缺陷结构,原子级分散的金属Co掺杂以及无定型钌纳米簇结构,并在碱性条件下催化析氢反应时,表现出了低起始过电位,低Tafel斜率(62 mV dec–1)和高稳定性.X射线衍射(XRD)结果表明,该催化剂中钌和钴以无定型形式存在.选区电子衍射结果表明了无定型结构的存在,并且钌以纳米簇形式存在,其平均粒径为1.48 nm.X射线光电子能谱结果表明该催化剂含有较高的氮掺杂,拉曼光谱证明了其存在碳缺陷结构.进一步通过X射线近边吸收谱和扩展边精细结构谱研究了钌和钴的配位环境,结果发现,钌带轻微正电荷,并且存在Ru–Ru键;钴带正电荷,价态介于0与+2价之间,其主要与N配位.在1 mol/L氢氧化钾电解液中,该杂化催化剂的电催化活性明显高于没有钴掺杂的催化剂以及商业化铂/碳催化剂.在电流密度为10 mAcm–2时,过电位仅为40 mV,在过电位为100 mV时,该催化剂的质量催化活性达到了3.77 mAμgRu–1,远超商业化铂/碳(2.01 mAμgRu–1)和钌/碳(1.66 mAμgRu–1).该催化剂也表现出了优异的析氢催化稳定性, 5000圈循环后, 10 mAcm–2下的过电位仅增加了2 mV,在恒电流测试中, 10 h后电位仅下降了95 mV.

关键词：无定型钌纳米簇单原子富缺陷碳析氢反应电催化

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Designing noble metal single-atom-loaded two-dimension photocatalyst for N2 and CO2 reduction via anion vacancy engineering

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Science Bulletin 2020年第9期65卷 720-725,M0003页

作者： Peng Zhou yuguang chao Fan Lv Jianping Lai Kai Wang Shaojun Guo Department of Materials Science and Engineering College of EngineeringPeking UniversityBeijing 100871China The Beijing Innovation Center for Engineering Science and Advanced Technology Peking UniversityBeijing 100871China

Building highly active and stable noble metal single atom(MSA)catalyst onto photocatalyst materials for nitrogen reduction reaction(NRR)and CO2 reduction reaction(CRR)is a key to future renewable energy conversion and storage *** we present a design strategy to optimize the stability and electronic property of noble metal single atoms(MSAs,M=Rh,Pd,Ag,Ir,Pt,Au)catalyst supported on g-C3N4 and 2H-MoS2 photocatalysts towards NRR and *** results indicate that the MSAs tend to be trapped at the anion-vacancy sites of photocatalyst rather than the pristine photocatalyst *** anion vacancy can promise the MSAs with an optimized electron-captured ability in the photoexcitation process,thus decreasing the energy barriers of NRR and CRR on ***,it is revealed that the N-vacancy-stabilized Ir SA on g-C3N4 and the S-vacancy-stabilized RhSA on 2H-MoS2 own the lowest energy barrier in ***,for CRR,the HCOOH is the main product on MSAs supported by gC3N4 and *** N-vacancy-stabilized PdSA on g-C3N4 and the S-vacancy-stabilized AuSA on 2H-MoS2 show the lowest energy barrier for HCOOH production in *** finding offers an approach to design specific active MSA centres on photocatalysts by the anion vacancy engineering.

关键词： Photocatalyst Noble metal Single atom CRR NRR

Face-to-face engineering of ultrathin Pd nanosheets on amorphous carbon nitride for efficient photocatalytic hydrogen production

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Science China Materials 2019年第3期62卷 351-358页

作者： Yonghua Tang Peng Zhou yuguang chao Fei Lin Jianping Lai Hongxing Li Shaojun Guo Department of Materials Science and Engineering and BIC-ESAT College of EngineeringPeking UniversityBeijing 100871China School of Physics and Optoelectronic Engineering Xiangtan UniversityXiangtan 411105China School of Materials Science and Engineering Ocean University of ChinaQingdao 266100China

Photocatalytic hydrogen production represents a promising strategy for clean, sustainable, and environmentfriendly energy supply. Up to now, great efforts have been devoted to designing the photocatalysts with noble metal as co-catalyst for visible-light-driven hydrogen evolution, while more efficient photocatalytic systems are still a major challenge. Herein, we report a facile strategy for synthesizing faceto-face ultrathin Pd nanosheets-amorphous carbon nitride(Pd NSs-ACN) structure with large contacting interface and short electronic transmission pathway, which can work as an efficient photocatalyst for hydrogen production. The synthesis starts with the growth of ultrathin Pd NSs, followed by assembly with the visible-light-response ACN through a simple stirring and annealing procedure. The resultant two dimensional face-to-face structures deliver an average hydrogen generation rate of 1.45 mmol h-1g-1 at a temperature of 25℃,almost 2.6 times higher than that of Pd Nps-ACN with particle-to-face structural feature. The efficient photocatalytic activity is ascribed to the formation of high-density of active sites between ultrafine face-to-face contacted Pd NSs and the ACN, which cooperate more synergistically towards photocatalytic hydrogen production. The face-to-face engineered Pd NSs-ACN hybrids also offer a good stability revealed by photocatalytic hydrogen production measurements. The extraordinary performance highlights a powerful engineering model for designing other face-to-face contacting co-catalyst/photocatalysts, which will be a great impetus to optimize new catalytic transformations.

关键词： face-to-face engineering ultrathin Pd nanosheets amorphous carbon nitride photocatalytic hydrogen production

BiOCl/ultrathin polyaniline core/shell nanosheets with a sensitization mechanism for efficient visible-light-driven photocatalysis

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Science China Materials 2019年第1期62卷 95-102页

作者： Yonghua Tang Peng Zhou Kai Wang Fei Lin Jianping Lai yuguang chao Hongxing Lit Shaojun Guo School of Physics and Optoelectronic Engineering Xiangtan University Department of Materials Science and Engineering College of Engineering Peking University School of Materials Science and Engineering Ocean University of China

Photocatalytic technology holds great promise in renewable energy and environmental ***,we report the synthesis of a class of polyaniline-sensitized BiOCI core/shell nanosheets with visible-light photocatalytic activity by a one-step oxidative polymerization method and show how the hybrid nanosheet boosts the photocatalytic activity and stability for degradation of Rhodamine B (RhB).In this unique structure,the ultrathin polyaniline (PANI)as a shell with the thickness of about 1-2nm,can widen the response of the catalyst to visible light to boost photocatalysis and the BiOCI core can promote the separation of photogenerated carriers from the *** demonstrate that the optimized BiOCl/ PANI core/shell photocatalyst shows nearly three times higher photocatalytic activity for the degradation of RhB than pure BLOC1and also shows high *** work provides a new strategy for the design of a highly efficient hybrid photo- catalyst driven by visible light.

关键词： BiOC1 core/shell nanosheets photocatalysis polyaniline

SnSe2 nanocrystals coupled with hierarchical porous carbon microspheres for long-life sodium ion battery anode

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Science China Materials 2020年第4期63卷 483-491页

作者： Hui Chen Zijie M u Yiju Li Zhonghong Xia Yong Yang Fan Lv Jinhui Zhou yuguang chao Jinshu Wang Ning Wang Shaojun Guo Department of Materials Science&Engineering College of EngineeringPeking UniversityBeijing 100871China State Key Laboratory of Electronic Thin Film and Integrated Devices University of Electronic Science and Technology of ChinaChengdu 610054China State Key Laboratory of Marine Resource Utilization in South China Sea Hainan UniversityHaikou 570228China BIC-ESAT College of EngineeringPeking UniversityBeijing 100871China Department of Energy and Resources Engineering College of EngineeringPeking UniversityBeijing 100871China

Tin selenides have been attracting great attention as anode materials for the state-of-the-art rechargeable sodium-ion batteries(SIBs)due to their high theoretical capacity and low ***,they deliver unsatisfactory performance in practice,owing to their intrinsically low conductivity,sluggish kinetics and volume expansion during the charge-discharge ***,we demonstrate the synthesis of SnSe2 nanocrystals coupled with hierarchical porous carbon(SnSe2 NCs/C)microspheres for boosting SIBs in terms of capacity,rate ability and *** unique structure of SnSe2 NCs/C possesses several advantages,including inhibiting the agglomeration of SnSe2 nanoparticles,relieving the volume expansion,accelerating the diffusion kinetics of electrons/ions,enhancing the contact area between the electrode and electrolyte and improving the structural stability of the *** a result,the as-obtained SnSe2 NCs/C microspheres show a high reversible capacity(565 mA h g^-1 after 100 cycles at 100 mA g^-1),excellent rate capability,and long cycling life stability(363 mA h g^-1 at1 A g^-1 after 1000 cycles),which represent the best performances among the reported SIBs based on SnSe2-based anode materials.

关键词： tin selenides nanocrystals hierarchical sodium-ion batteries

From waste to wealth:Coal tar residue derived carbon materials as low-cost anodes for potassium-ion batteries

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 464-475页

作者： Zhonghua Lu Jun Shen Xin Zhang Lingcong chao Liang Chen Ding Zhang Tao Wei Shoudong Xu College of Chemical Engineering and Technology Taiyuan University of TechnologyTaiyuan 030024China College of Chemistry Taiyuan University of TechnologyTaiyuan 030024China School of Chemical Engineering and Pharmacy Wuhan Institute of TechnologyWuhan 430205China School of Energy and Power Jiangsu University of Science and TechnologyZhenjiang 212003China

Carbon materials are widely recognized as highly promising electrode materials for various energy storage system *** tar residues(CTR),as a type of carbon-rich solid waste with high value-added utilization,are crucially important for the development of a more sustainable *** this study,we employed a straightforward direct carbonization method within the temperature range of 700-1000℃to convert the worthless solid waste CTR into economically valuable carbon materials as anodes for potassium-ion batteries(PIBs).The effect of carbonization temperature on the microstructure and the potassium ions storage properties of CTR-derived carbons(CTRCs)were systematically explored by structural and morphological characterization,alongside electrochemical performances *** on the co-regulation between the turbine layers,crystal structure,pore structure,functional groups,and electrical conductivity of CTR-derived carbon carbonized at 900℃(CTRC-900H),the electrode material with high reversible capacity of 265.6m Ah·g^(-1)at 50 m A·g^(-1),a desirable cycling stability with 93.8%capacity retention even after 100 cycles,and the remarkable rate performance for PIBs were ***,cyclic voltammetry(CV)at different scan rates and galvanostatic intermittent titration technique(GITT)have been employed to explore the potassium ions storage mechanism and electrochemical kinetics of *** indicate that the electrode behavior is predominantly governed by surface-induced capacitive processes,particularly under high current densities,with the potassium storage mechanism characterized by an“adsorption-weak intercalation”*** work highlights the potential of CTR-based carbon as a promising electrode material category suitable for high-performance PIBs electrodes,while also provides valuable insights into the new avenues for the high value-added utilization of CTR.

关键词： coal tar residue carbon materials anode potassium-ion batteries high value-added

具有优异甲醇耐受性的Rh掺杂Pd Cu有序金属间化合物纳米粒子增强氧还原电催化

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物理化学学报 2020年第9期36卷 139-146页

作者：李蒙刚夏仲泓黄雅荣陶璐晁玉广尹坤杨文秀杨微微于永生郭少军哈尔滨工业大学化工与化学学院新能源转化与储存关键材料技术工信部重点实验室哈尔滨150001 北京大学工学院材料科学与工程系北京100871 北京大学工学院工程科学与新兴技术高精尖中心北京100871

由于阴极催化剂有限的活性和耐久性以及甲醇渗透到阴极所导致的催化剂中毒问题,直接甲醇燃料电池(DMFCs)仍面临严峻的挑战。本文报道了一类新型的具有有序金属间结构的Rh掺杂PdCu纳米颗粒用于提高阴极氧还原反应(ORR)的活性、耐久性和... 详细信息

由于阴极催化剂有限的活性和耐久性以及甲醇渗透到阴极所导致的催化剂中毒问题,直接甲醇燃料电池(DMFCs)仍面临严峻的挑战。本文报道了一类新型的具有有序金属间结构的Rh掺杂PdCu纳米颗粒用于提高阴极氧还原反应(ORR)的活性、耐久性和甲醇耐受性。通过结合Rh原子掺杂以及有序金属间结构两者的优点,在碱性条件下,Rh掺杂Pd Cu金属间化合物催化剂在0.9 V电位下对氧还原质量活性相比商业Pt/C提高7.4倍。这种独特的结构还使其表现出出色的ORR耐久性,在连续20000个循环后的半波电位和质量活性几乎不变。此外,在苛刻的中毒环境下,仍可以保持Rh掺杂PdCu金属间化合物电催化剂高的氧还原催化活性。

关键词： Rh掺杂有序金属间化合物纳米颗粒氧还原甲醇耐受性

Characteristics of Bi-2223 HTS Tapes Under Short-Circuit Current Impacts in Hybrid Energy Transmission Pipelines

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CSEE Journal of Power and Energy Systems 2024年第2期10卷 736-745页

作者： yuguang Sun chao Yin Weizhen Li Xinyang Li Xiaohua Jiang Department of Electric Engineering Tsinghua UniversityBeijing 100084China

A hybrid energy transmission pipeline is proposed with the aim of long-distance cooperative transmission of electricity and chemical fuels, which is composed of an inner high-temperature superconducting (HTS) power cable and outer liquefied natural gas (LNG) pipeline. The flowing LNG could maintain the operating temperature of the inner HTS power cable within the range of 85 K-90 K, thus the Bi-2223 superconductors in the HTS power cable produce little Joule loss with the transmission current below the critical current. Owing to the advantages of high power density, low transmission losses and economical manufacturing costs, the hybrid energy transmission pipeline is expected to be widely utilized in the near future. In order to ensure the safety of the HTS power cable and explosive LNG in case of short-circuit faults, this paper tests and analyzes the characteristics of Bi-2223 HTS tapes of the Type HT-CA, Type HT-SS and Type H models under short-circuit current impacts at the LNG cooling temperature (85 K-90 K). An experimental platform is designed and established for the ampacity tests of HTS tapes above LN2 cooling temperature (77 K). The AC over-current impact tests at 85 K-90 K are carried out on each sample of Bi-2223 tapes respectively, and the experimental results are analyzed and compared to evaluate their performances under different operating conditions. The results indicate that the Type HT-CA tape can withstand 50 Hz short-circuit current impact with the amplitude of 1108 A (10 times of critical current Ic ) for 100 ms at 90 K, and its resistance is the smallest of the three tested samples under similar current impacts. Therefore, the Type HT-CA Bi-2223 tape is the optimal superconductor of the HTS power cable in the hybrid energy transmission pipeline.

关键词： Bi-2223 high-temperature superconducting(HTS)tape critical current hybrid energy transmission pipeline liquefied natural gas(LNG)cooling temperature short-circuit current impact characteristics