Abstract:MXene quantum dots (MQDs) offer wide applications owing to the abundant surface chemistry, tunable energy‐level structure, and unique properties. However, the application of MQDs in electrochemical energy conversion, including hydrogen evolution reaction (HER), remains to be realized, as it remains a challenge to precisely control the types of surface groups and tune the structure of energy levels in MQDs, owing to the high surface energy–induced strong agglomeration in post‐processing. Consequently, the deter… Show more
“…For instance, the Ti 2 CT x MQDs/Cu 2 O/Cu foam nanocomposite was prepared by self-assembly method (Fig. 18 a), and the Ti 2 CT x MQDs with –Cl, –O, and –OH afford a spontaneous substantial process from –Cl groups to –O groups during HER [ 164 ]. The increase in oxygen-containing groups of active sites, the conductivity of the Cu-based support, as well as Cu 2 O nanoparticles as bridges providing the stability, contribute to the derived more excellent HER performance compared with 2D MXenes (Fig.…”
Section: Catalytic Applicationsmentioning
confidence: 99%
“… Fig. 18 a Synthesis of Ti 2 CT x MQDs/Cu 2 O/Cu foam nanocomposite (top), the evolution process of functional groups and Soft X-ray emission spectrum (SXES) image; b The LSV image [ 164 ]. Copyright @2022, Zhengzhou University and Wiley.…”
It is well known that two-dimensional (2D) MXene-derived quantum dots (MQDs) inherit the excellent physicochemical properties of the parental MXenes, as a Chinese proverb says, “Indigo blue is extracted from the indigo plant, but is bluer than the plant it comes from.” Therefore, 0D QDs harvest larger surface-to-volume ratio, outstanding optical properties, and vigorous quantum confinement effect. Currently, MQDs trigger enormous research enthusiasm as an emerging star of functional materials applied to physics, chemistry, biology, energy conversion, and storage. Since the surface properties of small-sized MQDs include the type of surface functional groups, the functionalized surface directly determines their performance. As the Nobel Laureate Wolfgang Pauli says, “God made the bulk, but the surface was invented by the devil,” and it is just on the basis of the abundant surface functional groups, there is lots of space to be thereof excavated from MQDs. We are witnessing such excellence and even more promising to be expected. Nowadays, MQDs have been widely applied to catalysis, whereas the related reviews are rarely reported. Herein, we provide a state-of-the-art overview of MQDs in catalysis over the past five years, ranging from the origin and development of MQDs, synthetic routes of MQDs, and functionalized MQDs to advanced characterization techniques. To explore the diversity of catalytic application and perspectives of MQDs, our review will stimulate more efforts toward the synthesis of optimal MQDs and thereof designing high-performance MQDs-based catalysts.
“…For instance, the Ti 2 CT x MQDs/Cu 2 O/Cu foam nanocomposite was prepared by self-assembly method (Fig. 18 a), and the Ti 2 CT x MQDs with –Cl, –O, and –OH afford a spontaneous substantial process from –Cl groups to –O groups during HER [ 164 ]. The increase in oxygen-containing groups of active sites, the conductivity of the Cu-based support, as well as Cu 2 O nanoparticles as bridges providing the stability, contribute to the derived more excellent HER performance compared with 2D MXenes (Fig.…”
Section: Catalytic Applicationsmentioning
confidence: 99%
“… Fig. 18 a Synthesis of Ti 2 CT x MQDs/Cu 2 O/Cu foam nanocomposite (top), the evolution process of functional groups and Soft X-ray emission spectrum (SXES) image; b The LSV image [ 164 ]. Copyright @2022, Zhengzhou University and Wiley.…”
It is well known that two-dimensional (2D) MXene-derived quantum dots (MQDs) inherit the excellent physicochemical properties of the parental MXenes, as a Chinese proverb says, “Indigo blue is extracted from the indigo plant, but is bluer than the plant it comes from.” Therefore, 0D QDs harvest larger surface-to-volume ratio, outstanding optical properties, and vigorous quantum confinement effect. Currently, MQDs trigger enormous research enthusiasm as an emerging star of functional materials applied to physics, chemistry, biology, energy conversion, and storage. Since the surface properties of small-sized MQDs include the type of surface functional groups, the functionalized surface directly determines their performance. As the Nobel Laureate Wolfgang Pauli says, “God made the bulk, but the surface was invented by the devil,” and it is just on the basis of the abundant surface functional groups, there is lots of space to be thereof excavated from MQDs. We are witnessing such excellence and even more promising to be expected. Nowadays, MQDs have been widely applied to catalysis, whereas the related reviews are rarely reported. Herein, we provide a state-of-the-art overview of MQDs in catalysis over the past five years, ranging from the origin and development of MQDs, synthetic routes of MQDs, and functionalized MQDs to advanced characterization techniques. To explore the diversity of catalytic application and perspectives of MQDs, our review will stimulate more efforts toward the synthesis of optimal MQDs and thereof designing high-performance MQDs-based catalysts.
“…129 The surface modification results in higher efficiency along with the photo-response property of the material. Liu et al 130 in 2022 studied the evolution of surfaceactive groups of MXene Quantum Dots composed of Ti 2 CT x , wherein Cl -groups are continuously replaced by O-terminated groups, while the reaction is taking place in the cathode. The material was found to have good electrocatalytic efficiency towards HER with a lower over potential value of about 175mV owning to a current density of 10 mA cm-1 in an electrolytic solution of 1M aq.…”
Section: Variation In the Tmqds With Typical Reaction Conditionsmentioning
Hydrogen - the renewable, green, clean, and energy source for long-term has been exciting the interest of many researchers because hydrogen is produced alongside oxygen by splitting water using a...
“…Interestingly, transition group metals (Fe, Co, Ni, Cu, etc.) expected to be substitutes for noble metal catalysts due to the merits of unique d-orbital electronic structures and good electronic conductivity. − In addition, the interaction between transition group metals and hydrogen atoms is unfavorable to the catalytic reaction based on the description of the HER volcano diagram. The design of transition group metals is necessary for preparing high-performance electrocatalysts.…”
Section: Fundamental Knowledge For
Electrocatalytic Water
Splittingmentioning
Hydrogen fuel cell
vehicles have always been regarded as the main
direction for developing new energy vehicles in the future due to
their advantages of zero emission, high cruising range, and strong
environmental adaptability. Currently, although the related technologies
have gradually matured, there are still many factors hindering its
development. One of the main reasons is that the price of hydrogen
fuel increases the cost of using vehicles, which puts it at a competitive
disadvantage compared with traditional fuel vehicles and pure electric
vehicles. Herein, we summarize the recent development status of hydrogen
fuel cell vehicles at home and abroad, and analyze the cost and sustainability
brought by the latest scientific research progress to the hydrogen
production industry, which is derived from basic research on electrocatalysts
used in industrial electrocatalytic water splitting with an alkaline
electrolyte. Finally, the development of hydrogen fuel cell vehicles
was analyzed and prospected, which is one of the main application
fields of hydrogen in the future.
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