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"Guan, Xinwei"
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Flexible and efficient perovskite quantum dot solar cells via hybrid interfacial architecture
2021
All-inorganic CsPbI
3
perovskite quantum dots have received substantial research interest for photovoltaic applications because of higher efficiency compared to solar cells using other quantum dots materials and the various exciting properties that perovskites have to offer. These quantum dot devices also exhibit good mechanical stability amongst various thin-film photovoltaic technologies. We demonstrate higher mechanical endurance of quantum dot films compared to bulk thin film and highlight the importance of further research on high-performance and flexible optoelectronic devices using nanoscale grains as an advantage. Specifically, we develop a hybrid interfacial architecture consisting of CsPbI
3
quantum dot/PCBM heterojunction, enabling an energy cascade for efficient charge transfer and mechanical adhesion. The champion CsPbI
3
quantum dot solar cell has an efficiency of 15.1% (stabilized power output of 14.61%), which is among the highest report to date. Building on this strategy, we further demonstrate a highest efficiency of 12.3% in flexible quantum dot photovoltaics.
Perovskite quantum dots film has better mechanical stability and structural integrity compared to bulk thin film. Here, the authors demonstrate higher endurance of quantum dot films and develop hybrid CsPbI3 QD/PCBM device with PCE of 15.1% and 12.3% on rigid and flexible substrates, respectively.
Journal Article
Recent Advances in Carbon‐Based Electrodes for Energy Storage and Conversion
by
Singh, Gurwinder
,
Benzigar, Mercy
,
Yi, Jiabao
in
Alternative energy sources
,
Carbon
,
Carbon - chemistry
2023
Carbon‐based nanomaterials, including graphene, fullerenes, and carbon nanotubes, are attracting significant attention as promising materials for next‐generation energy storage and conversion applications. They possess unique physicochemical properties, such as structural stability and flexibility, high porosity, and tunable physicochemical features, which render them well suited in these hot research fields. Technological advances at atomic and electronic levels are crucial for developing more efficient and durable devices. This comprehensive review provides a state‐of‐the‐art overview of these advanced carbon‐based nanomaterials for various energy storage and conversion applications, focusing on supercapacitors, lithium as well as sodium‐ion batteries, and hydrogen evolution reactions. Particular emphasis is placed on the strategies employed to enhance performance through nonmetallic elemental doping of N, B, S, and P in either individual doping or codoping, as well as structural modifications such as the creation of defect sites, edge functionalization, and inter‐layer distance manipulation, aiming to provide the general guidelines for designing these devices by the above approaches to achieve optimal performance. Furthermore, this review delves into the challenges and future prospects for the advancement of carbon‐based electrodes in energy storage and conversion. Carbon‐based nanomaterials, including graphene, fullerenes, and carbon nanotubes, are among the most rapidly emerging building blocks for nanotechnologies. This review elucidates the advantages and the crucial role of these family materials and summarizes the prevailing strategies for achieving high‐performance energy storage and conversion applications.
Journal Article
Inorganic Halide Perovskite Quantum Dots: A Versatile Nanomaterial Platform for Electronic Applications
2023
HighlightsResearch progress on inorganic perovskites quantum dots is reviewed from three aspects: physical properties, synthesis approaches, and electronic applications.Inorganic perovskite quantum dots have been exploited as either the active layers or the additives in high-performance transistors and memories.Challenges and outlook on future advancement of perovskites quantum dots-based electronics are elaborated.Metal halide perovskites have generated significant attention in recent years because of their extraordinary physical properties and photovoltaic performance. Among these, inorganic perovskite quantum dots (QDs) stand out for their prominent merits, such as quantum confinement effects, high photoluminescence quantum yield, and defect-tolerant structures. Additionally, ligand engineering and an all-inorganic composition lead to a robust platform for ambient-stable QD devices. This review presents the state-of-the-art research progress on inorganic perovskite QDs, emphasizing their electronic applications. In detail, the physical properties of inorganic perovskite QDs will be introduced first, followed by a discussion of synthesis methods and growth control. Afterwards, the emerging applications of inorganic perovskite QDs in electronics, including transistors and memories, will be presented. Finally, this review will provide an outlook on potential strategies for advancing inorganic perovskite QD technologies.
Journal Article
Using entropy weight method and quality function deployment to develop emotion-driven dashboard interfaces for NEV
2025
New energy vehicles (NEVs) demand dashboard interfaces that not only present critical driving information but also evoke positive user emotions to enhance satisfaction and safety. This study develops a structured framework that integrates the Entropy Weight Method (EWM) and Quality Function Deployment (QFD) to embed emotion-driven requirements into NEV dashboard design. 56 Kansei words were collected through an online survey (
n
= 300) and prioritized to 15 through experts interviews. An anonymous online questionnaire (
n
= 101, 98 valid responses) collected adult drivers’ emotional perceptions across 15 descriptive adjectives. Exploratory factor analysis distilled these descriptors into four principal dimensions: Pleasant, Technological, Stylish, and Minimalist. Entropy weight calculation quantified the relative importance of each dimension, revealing Pleasantness as the highest-priority factor. The QFD process then translated these weighted emotional dimensions into specific design attributes, including optimal color contrast ratios, iconography style guidelines, typography choices, and interface layout coherence. Prototype dashboards developed according to this schema were evaluated in a pilot study, demonstrating strong congruence between user-prioritized emotions and perceived design quality. This framework offers a replicable, data-driven method for systematically aligning emotional user needs with interface design parameters in NEVs, thereby providing actionable guidance for designers aiming to improve user experience through emotion-driven dashboard development.
Journal Article
Natural Products Derived Porous Carbons for CO2 Capture
by
Singh, Gurwinder
,
Shayesteh, Hadi
,
Vinu, Ajayan
in
Adsorbents
,
Adsorption
,
Alternative energy sources
2023
As it is now established that global warming and climate change are a reality, international investments are pouring in and rightfully so for climate change mitigation. Carbon capture and separation (CCS) is therefore gaining paramount importance as it is considered one of the powerful solutions for global warming. Sorption on porous materials is a promising alternative to traditional carbon dioxide (CO2) capture technologies. Owing to their sustainable availability, economic viability, and important recyclability, natural products‐derived porous carbons have emerged as favorable and competitive materials for CO2 sorption. Furthermore, the fabrication of high‐quality value‐added functional porous carbon‐based materials using renewable precursors and waste materials is an environmentally friendly approach. This review provides crucial insights and analyses to enhance the understanding of the application of porous carbons in CO2 capture. Various methods for the synthesis of porous carbon, their structural characterization, and parameters that influence their sorption properties are discussed. The review also delves into the utilization of molecular dynamics (MD), Monte Carlo (MC), density functional theory (DFT), and machine learning techniques for simulating adsorption and validating experimental results. Lastly, the review provides future outlook and research directions for progressing the use of natural products‐derived porous carbons for CO2 capture. This review article highlights crucial insights and analyses to enhance the understanding of the application of porous carbons in CO2 capture. The review encompasses various aspects of porous carbons derived from natural precursors for CO2 capture such as precursors, synthesis, characterization, parameters affecting CO2 adsorption, and molecular simulation.
Journal Article
A Facile Alkali-Assisted Synthesis Strategy for Hierarchical Porous Carbon Aerogels for Supercapacitors
2024
Carbon aerogels synthesized via the polymerization of resorcinol (R) and formaldehyde (F) exhibit remarkable physiochemical properties, such as high thermal stability and excellent electrical conductivity. However, their limited specific surface area and porosity restrict their application potential. Herein, we developed hierarchical porous carbon aerogels using a one-step carbonization and activation method, directly converting the resin into carbon aerogel material by adding KOH as an activating agent. In contrast to conventional carbon aerogels with an irregular block ground structure, our hierarchical porous carbon aerogels exhibit substantially enhanced specific surface area, total pore volume, and surface oxygen content. In addition, this straightforward one-step fabrication approach holds significant promise for energy storage applications. Notably, the hierarchical porous carbon aerogel C1, with a KOH/RF mass ratio of 1, was proven to be the most effective electrode candidates, achieving a specific capacitance of 261.9 F·g−1 at 1 A·g−1 and 208.2 F·g−1 at 20 A·g−1. Moreover, it exhibited an outstanding rate capability of 79.5% and excellent capacity retention of approximately 97.5% after 10,000 cycles (7 A·g−1). This work highlights a promising approach for synthesizing commercial-grade carbon aerogels with hierarchical porosity, enabling high-performance energy storage applications.
Journal Article
Transition Metal Carbonitride MXenes Anchored with Pt Sub-Nanometer Clusters to Achieve High-Performance Hydrogen Evolution Reaction at All pH Range
2025
Highlights
Two-dimensional mono- and few-layered Ti
3
CNT
x
MXene nanosheets with extremely high nitrogen content were synthesized.
Better performance for hydrogen evolution reaction (HER) than Pt/C catalyst in acidic, neutral and alkaline solutions.
Exceptional performance of HER in both acidic and alkaline solutions.
A large current density (> 500 mA cm
−2
) has been achieved for HER.
Transition metal carbides, known as MXenes, particularly Ti
3
C
2
T
x
, have been extensively explored as promising materials for electrochemical reactions. However, transition metal carbonitride MXenes with high nitrogen content for electrochemical reactions are rarely reported. In this work, transition metal carbonitride MXenes incorporated with Pt-based electrocatalysts, ranging from single atoms to sub-nanometer dimensions, are explored for hydrogen evolution reaction (HER). The fabricated Pt clusters/MXene catalyst exhibits superior HER performance compared to the single-atom-incorporated MXene and commercial Pt/C catalyst in both acidic and alkaline electrolytes. The optimized sample shows low overpotentials of 28, 65, and 154 mV at a current densities of 10, 100, and 500 mA cm
−2
, a small Tafel slope of 29 mV dec
−1
, a high mass activity of 1203 mA mg
Pt
−1
and an excellent turnover frequency of 6.1 s
−1
in the acidic electrolyte. Density functional theory calculations indicate that this high performance can be attributed to the enhanced active sites, increased surface functional groups, faster charge transfer dynamics, and stronger electronic interaction between Pt and MXene, resulting in optimized hydrogen absorption/desorption toward better HER. This work demonstrates that MXenes with a high content of nitrogen may be promising candidates for various catalytic reactions by incorporating single atoms or clusters.
Journal Article
Metal nitride-based nanostructures for electrochemical and photocatalytic hydrogen production
by
Singh, Gurwinder
,
Kotkondawar, Abhay V.
,
Vinu, Ajayan
in
102 Porous / Nanoporous / Nanostructured materials < 100 Materials
,
103 Composites < 100 Materials
,
205 Catalyst / Photocatalyst / Photosynthesis < 200 Applications
2022
The over-dependence on fossil fuels is one of the critical issues to be addressed for combating greenhouse gas emissions. Hydrogen, one of the promising alternatives to fossil fuels, is renewable, carbon-free, and non-polluting gas. The complete utilization of hydrogen in every sector ranging from small to large scale could hugely benefit in mitigating climate change. One of the key aspects of the hydrogen sector is its production via cost-effective and safe ways. Electrolysis and photocatalysis are well-known processes for hydrogen production and their efficiency relies on electrocatalysts, which are generally noble metals. The usage of noble metals as catalysts makes these processes costly and their scarcity is also a limiting factor. Metal nitrides and their porous counterparts have drawn considerable attention from researchers due to their good promise for hydrogen production. Their properties such as active metal centres, nitrogen functionalities, and porous features such as surface area, pore-volume, and tunable pore size could play an important role in electrochemical and photocatalytic hydrogen production. This review focuses on the recent developments in metal nitrides from their synthesis methods point of view. Much attention is given to the emergence of new synthesis techniques, methods, and processes of synthesizing the metal nitride nanostructures. The applications of electrochemical and photocatalytic hydrogen production are summarized. Overall, this review will provide useful information to researchers working in the field of metal nitrides and their application for hydrogen production.
Journal Article
Emerging Multifunctional Carbon‐Nanomaterial‐Based Biosensors for Cancer Diagnosis
2024
Despite significant advancements in medical technology, cancer remains the world's second‐leading cause of death, largely attributed to late‐stage diagnoses. While traditional cancer detection methodologies offer foundational insights, they often lack the specificity, affordability, and sensitivity for early‐stage identification. In this context, the development of biosensors offers a distinct possibility for the precise and rapid identification of cancer biomarkers. Carbon nanomaterials, including graphene, carbon nitride, carbon quantum dots, and other carbon‐based nanostructures, are highly promising for cancer detection. Their simplicity, high sensitivity, and cost‐effectiveness contribute to their potential in this field. This review aims to elucidate the potential of emerging carbon‐nanomaterial‐based biosensors for early cancer diagnosis. The relevance of the various biosensor mechanisms and their performance to the physicochemical properties of carbon nanomaterials is discussed in depth, focusing on demonstrating broad methodologies for creating performance biosensors. Diverse carbon‐nanomaterial‐based detection techniques, such as electrochemical, fluorescence, surface plasmon resonance, electrochemiluminescence, and quartz crystal microbalance, are emphasized for early cancer detection. At last, a summary of existing challenges and future outlook in this promising field is elaborated.
Journal Article