With the increasing demands in energy consumption and increasing environmental concerns, it is of vital significance for developing renewable and clean energy sources to substitute traditional fossil fuels. As an outstanding candidate, hydrogen is recognized as a green energy carrier due to its high gravimetric energy density, zero carbon footprints, and earth-abundance. Currently, water splitting in alkaline electrolytes represents one of the most promising methods for sustainable hydrogen production, and the key challenge lies in the development of high-performance electrocatalysts for the hydrogen evolution reaction (HER). Given the rapid advances in the design and development of efficient catalysts towards the alkaline HER, especially capable transition metal (TM)-based materials, this review aims to summarise recent progress in the theoretical understanding of the alkaline HER and TM-based electrocatalysts. TM-based catalysts classified by their different anionic compositions (metals, alloys, oxides, hydroxides, sulfides, selenides, tellurides, nitrides, phosphides, carbides, and borides) are comprehensively showcased. Special attention is given to mainstream strategies that can improve the catalytic properties of each category, as well as the underlying structure–activity regimes. Additionally, the challenges for the future development of novel catalysts are also analyzed.

/pdf/recent-advances-in-transition-metal-based-electrocatalysts-59rc9vo2xq.pdf

Recent advances in transition metal-based electrocatalysts for alkaline hydrogen evolution

Luminescent carbon quantum dots (CQDs) represent a new form of nanocarbon materials which have gained widespread attention in recent years, especially in chemical sensor, bioimaging, nanomedicine, solar cells, light-emitting diode (LED), and electrocatalysis. CQDs can be prepared simply and inexpensively by multiple techniques, such as the arc-discharge method, microwave pyrolysis, hydrothermal method, and electrochemical synthesis. CQDs show excellent physical and chemical properties like high crystallization, good dispersibility, photoluminescence properties. In particular, the small size, superconductivity, and rapid electron transfer of CQDs endow the CQDs-based composite with improved electric conductivity and catalytic activity. Besides, CQDs have abundant functional groups on the surface which could facilitate the preparation of multi-component electrical active catalysts. The interactions inside these multi-component catalysts may further enhance the catalytic performance by promoting charge transfer which plays an important role in electrochemistry. Most recent researches on CQDs have focused on their fluorescence characteristics and photocatalytic properties. This review will summarize the primary advances of CQDs in the synthetic methods, excellent physical and electronic properties, and application in electrocatalysis, including oxygen reduction reaction (ORR), oxygen evolution reaction (OER), hydrogen evolution reduction (HER), and CO2 reduction reaction (CO2RR).

/pdf/a-mini-review-on-carbon-quantum-dots-preparation-properties-7ft9qrk7un.pdf

A Mini Review on Carbon Quantum Dots: Preparation, Properties, and Electrocatalytic Application.

Water electrolysis is a sustainable approach for hydrogen production by using electricity from clean energy sources. However, both the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER) associated with water electrolysis are kinetically sluggish, leading to low efficiency in corresponding electrolysis devices. In addition, current electrocatalysts that can catalyze both HER and OER to practical rates require noble metals such as platinum that are low in abundance and high in price, severely limiting commercialization. As a result, the development of high-performance and cost-effective non-noble metal electrocatalysts to replace noble ones has intensified. Based on this, this review will comprehensively present recent research in the design, synthesis, characterization and performance validation/optimization of non-noble metal HER electrocatalysts and analyze corresponding catalytic mechanisms. Moreover, several important types of non-noble metal electrocatalysts including zero-dimensional, one-dimensional, two-dimensional and three-dimensional materials are presented with an emphasis on morphology/structure, synergetic interaction between metal and support, catalytic property and HER activity/stability. Furthermore, existing technical challenges are summarized and corresponding research directions are proposed toward practical application. Water electrolysis is a sustainable approach for hydrogen production by using electricity from clean energy sources. However, both the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) are kinetically sluggish, causing low efficiency of the electrolysis devices. The currently used noble metals, such as Pt-based electrocatalysts for catalyzing both HER and OER to practical rates, have low abundances and high price, limiting their commercialization. In this regard, developing high-performance and cost-effective non-noble metal electrocatalysts to replace noble ones has become a hot research topic.

Non-noble Metal Electrocatalysts for the Hydrogen Evolution Reaction in Water Electrolysis

Surface and interface engineering of noble-metal-free electrocatalysts for efficient overall water splitting

Carbon quantum dot-based composites for energy storage and electrocatalysis: Mechanism, applications and future prospects

The exploration of highly efficient non-noble metal electrocatalysts for hydrogen evolution reaction (HER) under alkaline conditions is highly imperative but still remains a great challenge. In this work, the nanohybrid of carbon quantum dots and molybdenum phosphide nanoparticle (CQDs/MoP) has been firstly demonstrated as an efficient alkaline HER electrocatalyst. The CQDs/MoP nanohybrid is readily prepared through a charge-directed self-assembly of CQDs with phosphomolybdic acid (H3PMo12O40) at the molecular level, followed by facile phosphatizing at 700 °C. The introduction of CQDs greatly helps to alleviate the agglomeration and surface oxidation of MoP nanoparticles and ensures each MoP nanoparticle to be electronically addressed, thus significantly enhancing the intrinsic catalytic activity of MoP. The optimized CQDs/MoP exhibits high-efficiency synergistic catalysis toward HER in 1 M KOH electrolyte with a low onset potential of −0.08 V and a small Tafel slope of 56 mV dec–1 as well as high durabil...

Nanohybrid of Carbon Quantum Dots/Molybdenum Phosphide Nanoparticle for Efficient Electrochemical Hydrogen Evolution in Alkaline Medium.

POM-assisted coating of MOF-derived Mo-doped Co3O4 nanoparticles on carbon nanotubes for upgrading oxygen evolution reaction

Engineering Synergistic Edge-N Dipole in Metal-Free Carbon Nanoflakes toward Intensified Oxygen Reduction Electrocatalysis

The invention discloses a nitrogen-doped porous graphite-like carbon nanosheet as well as preparation and electrocatalytic application thereof. The carbon nanosheet has a flaky morphology, and is richin nitrogen doping amount, large in pore volume, high in mesoporous ratio, and highly graphitized as a whole. According to the preparation of the carbon nanosheet, a metal oxide nanosheet of manganese is taken as a template, a metal organic framework material is taken as a carbon source, a sandwich-type sandwich composite structure precursor material is formed by the template and the carbon source, the precursor material is pyrolyzed in an atmosphere without water or oxygen, the template is removed through acid treatment, the obtained product after the removal of the template is mixed with anitrogen source, and annealing is performed again to prepare the carbon nanosheet. A preparation method has the advantages that the raw materials are easy to obtain, the preparation is simple, the production cost is low, the macro preparation is easy to implement and the like, and provides a universal synthetic route for preparing a two-dimensional doped porous carbon material with high degree ofgraphitization from the metal organic framework material. At the same time, the invention also discloses the application of the nitrogen-doped porous graphite-like carbon nanosheet with a high specific surface and a rich mesoporous structure and as a metal-free catalyst to high-efficiency electrocatalytic oxygen reduction reactions.

Nitrogen-doped porous graphite-like carbon nanosheet as well as preparation and electrocatalytic application thereof

Handle everyday research tasks with reliable, citation-backed results

Your personal Research Agent to handle research tasks with citation-backed results

Popular Tasks used by Researchers

How can I help with your research?

Meet SciSpace

Get more enhanced response by uploading the PDFs you want me to reference.

No relevant PDFs in your library

SciSpace is the AI research assistant for academics. Run systematic literature reviews on 280M+ papers, and write papers with cited sources. Trusted by 1M+ students, PhDs & researchers.

SciSpace | AI for Research

Analyze PDFs

Code & Manuscripts

Funding & Grants

Literature & Patents

Medical & Clinical Data

Systematic Review

Visualize & Present

Web & Data

Build a Google Scholar-like website for your research.

Build a website

Create charts and images for your research

Create a Chart

Write a paper for submission to a journal

Draft a manuscript

Patent Search

Design eye-catching scientific posters in minutes.

Scientific Poster Generation

Systematic Literature Review

One task is running at the moment. Your messages will be shown right after.

Drag and drop or click here to browse

Loved by <highlight>1 million+</highlight> researchers

Extract a list of specific topics and their sources from unstructured text

Topics

Compare and analyze relevant papers that matches with your search

Papers

Get insights from PDFs and bookmarked papers from your library

My library

Recent searches

Try searching for:

Catch AI-generated content in scholarly and non-scholarly content

{ai} Detector

Ai Writer

Get PDF Summaries, highlighted text explanations 

Chat with PDF

Effortlessly create in-text citations and bibliographies in APA and 2,500 other formats

Citation generator

Get explanations, summaries, and answers on academic papers

Ease up your research workflow with {scispace}'s cohort of exciting AI tools

Elevate your academic writing skills and convey your ideas the way you want

Paraphraser

Explore our range of reading and writing tools

Your file is being prepared and should be ready in a few minutes. If it's a large file, it might take a bit longer. You can close this window, and we'll email you the file when it's done.

You have reached a maximum limit of <strong>{limit}</strong> columns in the table. Remove at least <strong>1</strong> column to add or create another one.

Kanglong Lu

Author Tools

Chat about Author

Papers

Nanohybrid of Carbon Quantum Dots/Molybdenum Phosphide Nanoparticle for Efficient Electrochemical Hydrogen Evolution in Alkaline Medium.

POM-assisted coating of MOF-derived Mo-doped Co3O4 nanoparticles on carbon nanotubes for upgrading oxygen evolution reaction

Engineering Synergistic Edge-N Dipole in Metal-Free Carbon Nanoflakes toward Intensified Oxygen Reduction Electrocatalysis

Nitrogen-doped porous graphite-like carbon nanosheet as well as preparation and electrocatalytic application thereof