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Light tuning CO/H_(2)composition on Ag:Unraveling CO_(2)mass transfer and electron-phonon coupling in plasmon-enhanced electrocatalysis

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Nano Research 2025年第1期18卷 173-185页

作者： Rui Lin Dong Fan Luca MBerger Thomas Possmayer Yu Zhou Jiexin Zhu Xingbao Chen Wen Luo Lars Allmendinger Andreas Tittl Leonardo de Souza Menezes Guillaume Maurin shihe yang and Stefan AMaier Nanoinstitute Munich Faculty of PhysicsLudwig-Maximilians-Universität München80539 MunichGermany Institut Charles Gerhardt Montpellier UMR 5253 CNRS ENSCM UniversitéMontpellierPlace E.Bataillon34090 MontpellierFrance Guangdong Provincial Key Lab of Nano-Micro Material Research School of Advanced MaterialsPeking University Shenzhen Graduate SchoolShenzhen 518055China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Faculty of Chemistry and Pharmacy Ludwig-Maximilians-Universität München81377 MunichGermany Departamento de Física Universidade Federal de Pernambuco50670-901 Recife-PEBrazil School of Physics and Astronomy Monash University Clayton CampusMelbourneVictoria 3800Australia Department of Physics Imperial College LondonSW72AZ LondonUK

Plasmon-enhanced electrocatalysis(PEEC)is an emerging approach to mitigate CO_(2)*** mechanisms behind CO_(2)adsorption and reduction at the catalyst-electrolyte interface in PEEC still need to be further ***,we employ a well-defined Ag nanostructure to elucidate these pivotal *** shining light with wavelengths of 625,525,405 nm on Ag,an adjustable CO/H_(2)ratio from 35 to 1 can be *** reaction pathway changing under plasmonic excitation does not originate from the lowered CO_(2)mass transfer in the vicinity of Ag,as the electrochemical quartz crystal microbalance results unravel that a slightly elevated temperature in bulk electrolyte caused by light irradiation cannot weaken the CO_(2)adsorption at the Ag catalyst-electrolyte *** calculations reveal that optical excitation towards shorter wavelengths leads to a progressive lowered energy barrier for H_(2)formation together with an enhanced energy barrier for^(*)COOH *** thermodynamically suppressed,CO_(2)reduction can still be improved kinetically by optimizing the excitation wavelength and intensity,being accompanied with the enhanced *** absorption spectroscopy results further correlate the higher photocurrent with a prolonged electron-phonon coupling time,verifying that the improvement of CO_(2)reduction kinetics in PEEC can be realized by hot electron harnessing.

关键词： plasmonic catalysis photoelectrochemical CO_(2)reduction CO/H_(2)ratio hot electron generation electronphonon coupling thermal effect

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Dye-sensitized solar cells based on ZnO nanotetrapods

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Frontiers of Optoelectronics 2011年第1期4卷 24-44页

作者： Wei CHEN shihe yang Department of Chemistry The Hong Kong University of Science and Technology Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology

In this paper, we reviewed recent systematic studies of using ZnO nanotetrapods for photoanodes of dye-sensitized solar cells（DSSCs） in our group. First, the efficiency of power conversion was obtained by more than3.27% by changes of conditions of dye loading and film thickness of ZnO nanotetrapod. Short-circuit photocurrent densities(Jsc) increased with the film thickness, Jscwould not be saturation even the film thickness was greater than 35 μm. The photoanode architecture had been charactered by good crystallinity, network forming ability, and limited electron-hopping interjunctions. Next, DSSCs with high efficiency was devised by infiltrating SnO2nanoparticles into the ZnO nanotetrapods photoanodes. Due to material advantages of both constituents described as above, the composite photoanodes exhibited extremely large roughness factors（RFs）, good charge collection, and tunable light scattering properties. By varying the composition of the composite photoanodes, we had achieved an efficiency of 6.31% by striking a balance between high efficiency of charge collection for SnO2nanoparticles rich films and high light scattering ability for ZnO nanotetrapods rich films. An ultrathin layer of ZnO was found to form spontaneously on the SnO2nanoparticles, which primarily was responsible for enhancing open-circuit photovoltage(Voc). We also identified that recombination in SnO2/ZnO composite films was mainly determined by ZnO shell condition on SnO2, whereas electron transport was greatly influenced by the morphologies and sizes of ZnO crystalline additives. Finally, we applied the composite photoanodes of SnO2nanoparticles/ZnO nanotetrapods to flexible DSSCs by low temperature technique of “acetic acid gelation-mechanical press-ammonia activation.” The efficiency has been achieved by 4.91% on ITO-coated polyethylenenaphtalate substrate. The formation of a thin ZnO shell on SnO2nanoparticles, after ammonia activation, was also found to be critical to boosting Vocand to imp

关键词： dye-sensitized solar cell (DSSC) metal oxides nanostructure ZnO nanotetrapod photoanode flexible solar cell

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Materials and structures for the electron transport layer of efficient and stable perovskite solar cells

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Science China Chemistry 2019年第7期62卷 800-809页

作者： Shizhao Zheng Gaopeng Wang Tongfa Liu Lingyun Lou Shuang Xiao shihe yang Guangdong Key Laboratory of Nano-Micro Material Research School of Chemical Biology and Biotechnology Shenzhen Graduate SchoolPeking University

The electron transport layer plays a vital function in extracting and transporting photogenerated electrons, modifying the interface, aligning the interfacial energy level and minimizing the charge recombination in perovskite solar cells. This review summarizes the recent research progress on electron transport materials of metal oxides, organic molecules and multilayers. The doped metal oxides as electron transport materials in regular perovskite solar cells show improved device performance relative to their non-doped counterpart due to enhanced electron mobility and energy level alignment. The non-fullerene organic electron transport materials with better electron mobility and tunable energy level alignment need to be further designed and developed despite their advantages of mechanical flexibility and wide range tunability. The multilayer electron transport materials are suggested to be an important direction of research for efficient and stable perovskite solar cells because of their favorable synergistic interaction.

关键词： perovskite solar cells electron transport layer metal oxide organic molecules multilayer

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Two-step solvent post-treatment on PTAA for highly efficient and stable inverted perovskite solar cells

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Photonics Research 2020年第10期8卷 I0002-I0012页

作者： yang LI CHAO LIANG GAOPENG WANG JIELEI LI SHI CHEN shihe yang CUICHUANG XING HUI PAN Joint Key Laboratory of the Ministry of Education Institute of Applied Physics and Materials EngineeringUniversity of MacaoMacao SAR999078China Guangdong Key Laboratory of Nano-Micro Material Research School of Chemical Biology and BiotechnologyShenzhen Graduate SchoolPeking UniversityShenzhen 518055China Department of Physics and Chemistry Faculty of Science and TechnologyUniversity of MacaoMacao SAR999078China

Modifying the surface of poly[bis(4-phenyl)(2,4,6-trimethylphenyl)amine](PTAA)with toluene during the high-speed spin-coating process of dimethylformamide considerably improves the wettability and morphology of PTAA and results in improvement of the crystallinity and absorption of perovskite *** hole mobility and ohm contact have also been improved *** with these improved parameters,inverted perovskite solar cells with high efficiency of 19.13%and long-term stability could be achieved,which are much better than those with untreated ***,our devices can keep 88.4%of the initial power conversion efficicncy after 30 days of storage in ambient air.

关键词： film. perovskite ambient

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Synthesis of Li-doped Co_3O_4 truncated octahedra with improved performances in CO oxidation and lithium ion batteries

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Science China(Technological Sciences) 2013年第1期56卷 8-12页

作者： JIN Hong CUI ZhiMin ZHOU Wei GUO Lin yang shihe School of Chemistry and Environment Beihang University Department of Chemistry Hong Kong University of Science and TechnologyClear Water BayKowloon

Single-crystalline Li-doped Co3O4 truncated octahedra with different doping contents were synthesized by a simple combustion method with the fuel of multi-walled carbon nanotubes(MWCNTs).Controlled experiments showed that the pristine well-defined Co3O4 octahedra were obtained with exposed surfaces of {111} planes without lithium *** comparison with the octahedra,the truncated Co3O4 octahedra were composed of original {111} planes and extra {100} *** could be attributable to the selective adsorption of lithium ions on the {100} planes,making these planes with higher surface energy coexist with the crystal faces of {111}.Furthermore,the Li-doped truncated octahedra and undoped octahedra were used as catalysts in CO oxidation and as anode materials for Li-ion batteries(LIBs).The measurements exhibited that the Li-doped octahedra with added {100} crystal faces showed improved catalytic activity and electrochemical property because of the exposure of the higher energy faces of {100} and enhanced conductivity by Li doping.

关键词： truncated octahedron high-energy face doping CO oxidation Li-ion battery

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High-quality perovskite in thick scaffold： a core issue for hole transport material-free perovskite solar cells

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Science Bulletin 2016年第21期61卷 1680-1688页

作者： Haining Chen shihe yang School of Materials Science and Engineering BeihangUniversity Beijing 100191 China Department of Chemistry The Hong Kong University of Scienceand Technology Hong Kong China

Organic-inorganic perovskite solar cells （PSCs） have attracted intense attention in the last few years due to the phenomenal increase in power conversion efficiency （PCE）, but their low stability has greatly hindered their practical application. By removing unstable hole transport materials （HTM）, the device stability of HTM-free PSCs has been greatly improved. However, the PCE has largely lagged behind those of HTM-based PSCs. We contend that deposition of high-quality perovskite into a thick scaffold is the key to achieving high-performance, HTM-free PSCs. Indeed, a few deposition methods have been used to successfully deposit a high-quality perovskite layer into a relatively thick TiO2 scaffold, hence producing PSCs with relatively high PCEs. In this review, we will introduce the basic working principle of HTM-free PSCs and analyze the important role of thick TiO2 scaffold. Most importantly, the problems of the conventional perovskite deposition methods in thick TiO2 scaffold will be examined and some recent successful deposition methods will be surveyed. Finally, we will draw conclusions and highlight some promising research directions for HTM-free PSCs.

关键词： Hole transport materials-free Auelectrode Carbon electrode Porous scaffoldPerovskite layer

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Current progress in developing metal oxide nanoarrays-based photoanodes for photoelectrochemical water splitting

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Science Bulletin 2019年第18期64卷 1348-1380页

作者： Yongcai Qiu Zhenghui Pan Haining Chen Daiqi Ye Lin Guo Zhiyong Fan shihe yang Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control School of Environment and EnergySouth China University of TechnologyGuangzhou 510006China State Key Laboratory of Luminescent Materials and Devices South China University of TechnologyGuangzhou 510640China Department of Materials Science and Engineering National University of SingaporeSingapore 117574Singapore School of Materials Science and Engineering Beihang UniversityBeijing 100191China School of Chemistry and Environment Beihang UniversityBeijing 100191China Department of Electronic and Computer Engineering The Hong Kong University of Science and TechnologyHong KongChina Department of Chemistry The Hong Kong University of Science and TechnologyHong KongChina Guangdong Key Lab of Nano-Micro Material Research School of Chemical Biology and Biotechnology Shenzhen Graduate SchoolPeking UniversityShenzhen 518055China

Solar energy driven photoelectrochemical(PEC) water splitting is a clean and powerful approach for renewable hydrogen production. The design and construction of metal oxide based nanoarray photoanodes is one of the promising strategies to make the continuous breakthroughs in solar to hydrogen conversion efficiency of PEC cells owing to their owned several advantages including enhanced reactive surface at the electrode/electrolyte interface, improved light absorption capability, increased charge separation efficiency and direct electron transport pathways. In this Review, we first introduce the structure,work principle and their relevant efficiency calculations of a PEC cell. We then give a summary of the state-of the-art research in the preparation strategies and growth mechanism for the metal oxide based nanoarrays, and some details about the performances of metal oxide based nanoarray photoanodes for PEC water splitting. Finally, we discuss key aspects which should be addressed in continued work on realizing high-efficiency metal oxide based nanoarray photoanodes for PEC solar water splitting systems.

关键词： Photoelectrochemical water splitting Metal oxide based nanoarray photoanodes Preparation strategies and growth mechanism

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Highly efficient and stable white LEDs based on pure red narrow bandwidth emission triangular carbon quantum dots for wide-color gamut backlight displays

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Nano Research 2019年第7期12卷 1669-1674页

作者： Fanglong Yuan Ping He Zifan Xi Xiaohong Li Yunchao Li Haizheng Zhong Louzhen Fan shihe yang College of Chemistry Beijing Normal UniversityBeijing 100875China Beijing Key Laboratory of Nanophotonics and Ultrafine Optoelectronic Systems School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081China Guangdong Key Lab of Nano-Micro Material Research School of Chemical Biology and BiotechnologyShenzhen Graduate SchoolPeking UniversityShenzhen 518055China

High-performance white light-emitting diodes (WLEDs) hold great potential for the next-generation backlight display ***,achieving highly efficient and stable WLEDs with wide-color-gamut has remained a formidable *** here is the first example of pure red narrow bandwidth emission triangular CQDs (PR-NBE-T-CQDs) with photoluminescence peaking at 610 *** PR-NBE-T-CQDs synthesized from resorcinol show high quantum yield (QY) of 72% with small full width at half maximum of 33 *** simply controlling the reaction time,pure green (PG-) NBE-T-CQDs with high QY of 75% were also *** efficient and stable WLEDs with wide-color-gamut based on PR- and PG-NBE-T-CQDs was *** WLED showed a remarkable wide-color gamut of 110% NTSC and high power efficiency of 86.5 lumens per ***,such WLEDs demonstrate outstanding *** work will set the stage for developing highly efficient,low cost and environment-friendly WLEDs based on CQDs for the next-generation wide-color gamut backlight displays.

关键词： pure red carbon quantum dots white light-emitting diodes wide-color gamut highly efficient

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D-π-D molecular layer electronically bridges the NiO_(x) hole transport layer and the perovskite layer towards high performance photovoltaics

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Journal of Energy Chemistry 2022年第4期31卷 797-804页

作者： Rongguo Xu Xiuwen Xu Ruixi Luo Yu Li Gaopeng Wang Tongfa Liu Ning Cai shihe yang Guangdong Provincial Key Lab of Nano-Micro Materials Research School of Chemical Biology and BiotechnologyShenzhen Graduate SchoolPeking UniversityShenzhen 518055GuangdongChina School of Chemical Engineering and Light Industry Guangdong University of TechnologyGuangzhou 510006GuangdongChina Institute of Biomedical Engineering Shenzhen Bay LaboratoryShenzhen 518107GuangdongChina

Nickel oxide (NiO_(x)) has significant cost and stability advantages over poly[bis (4-phenyl)(2,4,6-trimethyl phenyl)amine](PTAA) for inverted p-i-n perovskite solar cells (PSCs),but the poor NiO_(x)/perovskite contact stemming from some reactive species at the interface led to suboptimal device *** solve this problem,we take a multiple donor molecule approach,using 3,3’-(4,8-bis(hexylthio)benzo[1,2-b:4,5-b’]dithiophene-2,6-diyl)bis(10-(6-bromohexyl)-10H-phenoxazine)(BDT-POZ) as an example,to modify the NiO_(x)/perovskite *** primary goal was to reduce the under-coordinated Ni^(≥3+) cations via electron transfer from the donor molecules to NiO_(x),thus mitigating the detrimental reactions between perovskite and NiO_(x).Equally importantly,the hole extraction at the interface was greatly enhanced after the organic donor modification,since the hydrophobic species atop NiO_(x) not only enabled pinhole-free crystallization of the perovskite but also properly tuned the interfacial energy level ***,the PSCs with NiO_(x)/BDT-POZ HTL achieved a high power conversion efficiency (PCE) up to 20.16%,which compared excellently with that of the non-modified devices (17.83%).This work provides a new strategy to tackle the exacting issues that have so far impeded the development of NiO_(x) based PSCs.

关键词： Perovskite solar cells NiO_(x)modification Hole transport Energy level alignment High performance

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Long-Chain Gemini Surfactant-Assisted Blade Coating Enables Large-Area Carbon-Based Perovskite Solar Modules with Record Performance

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Nano-Micro Letters 2023年第10期15卷 463-477页

作者： Yumin Ren Kai Zhang Zedong Lin Xiaozhen Wei Man Xu Xianzhen Huang Haining Chen shihe yang Guangdong Provincial Key Lab of Nano‑Micro Material Research School of Chemical Biology and BiotechnologyShenzhen Graduate SchoolPeking UniversityShenzhen 518055People’s Republic of China Shenzhen Bay Laboratory Institute of Biomedical EngineeringShenzhen 518107GuangdongPeople’s Republic of China School of Materials Science and Engineering Beihang UniversityBeijing 100191People’s Republic of China

Carbon-based perovskite solar cells show great potential owing to their low-cost production and superior stability in ambient ***,scaling up to high-efficiency carbon-based solar modules hinges on reliable deposition of uniform defect-free perovskite films over large areas,which is an unsettled but urgent *** this work,a long-chain gemini surfactant is introduced into perovskite precursor ink to enforce self-assembly into a network structure,considerably enhancing the coverage and smoothness of the perovskite *** long gemini surfactant plays a distinctively synergistic role in perovskite film construction,crystallization kinetics modulation and defect passivation,leading to a certified record power conversion efficiency of 15.46%with Voc of 1.13 V and Jsc of 22.92 mA cm^(-2)for this type of ***,all of the functional layers of the module are printed through a simple and high-speed(300 cm min^(-1))blade coating strategy in ambient *** results mark a significant step toward the commercialization of all-printable carbon-based perovskite solar modules.

关键词： Long-chain gemini surfactant Blade-coating Capillary number Carbon-based perovskite photovoltaics All-printable module

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