MXene Nanofibers as Highly Active Catalysts for Hydrogen Evolution Reaction

Yuan, Weizheng; Cheng, Laifei; An, Yurong; Wu, Heng; Na, Yao; Fan, Xiaoli; Guo, Xiaohui

doi:10.1021/acssuschemeng.8b01348

Cited by 199 publications

(126 citation statements)

References 47 publications

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“…In addition, the existence of M–C species (M = Ti and V) on the surface is confirmed by the C 1s peak at 281.8 eV, which further ensures that there is no obvious oxidation occurred to form TiO 2 (Figure S8, Supporting Information) . Further deconvolution of this peak to confirm V doping is, however, difficult due to very similar binding energies of Ti–C and V–C …”

Section: Resultsmentioning

confidence: 85%

Highly Enhanced Pseudocapacitive Performance of Vanadium‐Doped MXenes in Neutral Electrolytes

Zuo-ning

Zheng

Lee

2019

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Recently, transition-metal carbides and nitrides (MXenes), an emerging family of 2D materials, have been engaged as novel alternatives for electrochemical energy storage materials owing to their excellent electrical conductivity and hydrophilic surfaces. [4,[9][10][11][12][13] Until now, Ti 3 C 2 T x is the most widely studied MXene where T represents surface species, typically terminated by O, OH, and F groups. [14] The electrochemical behavior of Ti 3 C 2 T x is predominantly pseudocapacitive in acidic solutions due to the surface redox chemistry, [15,16] delivering remarkable capacitances. [17,18] In contrast, the capacitive performances of Ti 3 C 2 T x in neutral solutions (containing alkali metal salt) are much poorer. It was reported that Ti 3 C 2 T x exhibits either electrochemical double-layer capacitance or pseudocapacitance arising from the spontaneous intercalation of electrolyte cations into the Ti 3 C 2 T x layers. [4,15,16] Generally, the capacitive performance of MXenes in neutral electrolytes is primarily determined by their morphology and surface electronic properties, which dictate the interaction mechanism and binding strength between the adsorbates and MXenes and thus contribute to the pseudocapacitive property. [19][20][21] Hence, in order to improve the pseudocapacitance of MXenes in neutral electrolytes, it is vital to increase the adsorption strength between adsorbates (typically, Li + , Na + , or K + ions) in aqueous electrolyte and the surface functional groups of MXene (O and OH groups) by surface electronic engineering. In this regard, heteroatom doping has been proved to be an efficient way of tuning the surface activity. [22,23] Among available dopants, vanadium has been reported as a viable choice for doping transition metal carbides due to its atomic size similar to Ti and better interaction with alkali metal ions. [19] Herein, we report for the first time that the vanadium doping on the surface of Ti 3 C 2 T x MXene significantly improves the pseudocapacitive performance under neutral conditions. The morphologic and structural properties of V-doped Ti 3 C 2 T x MXene (V-MXene) are extensively investigated to elucidate the influence of V doping on the surface species. Their capacitance properties and surface reaction mechanisms are discussed in depth using electrochemical data. Finally, the density functional theory (DFT) calculations are engaged to provide further insights to the high capacitance of V-doped MXene by understanding the interactions between the adsorbates (Li + , Na + , and K + ) and surficial O species of V-MXenes.2D titanium carbide (Ti 3 C 2 T x MXene) is recognized as a promising material for pseudocapacitor electrodes in acidic solutions, while the current studies in neutral electrolytes show much poorer performances. By a simple hydrothermal method, vanadium-doped Ti 3 C 2 T x 2D nanosheets are prepared to tune the interaction between MXene and alkali metal adsorbates (Li + , Na + , and K + ) in the neutral electrolyte. Maintaining the 2D morphology of MXe...

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Section: Resultsmentioning

confidence: 85%

Highly Enhanced Pseudocapacitive Performance of Vanadium‐Doped MXenes in Neutral Electrolytes

Zuo-ning

Zheng

Lee

2019

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“…The utilization of rational architecture design and carbon‐based backbones is essential for fabricating an aggregation‐resistant open structure to feature a fast surface kinetics. [ 4,23,24 ] Noted that MXene compound based nanofiber, [ 25 ] crumped devices, [ 23 ] and macropores [ 24 ] have been successfully fabricated and demonstrated their outstanding applications. It is attributed to their enhanced conductivity and ion accessibility.…”

Section: Figurementioning

confidence: 99%

Efficient Energy Conversion and Storage Based on Robust Fluoride‐Free Self‐Assembled 1D Niobium Carbide in 3D Nanowire Network

Pang

Wong

et al. 2020

Advanced Science

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2D materials have drawn tremendous attention and extensive investigations for emerging applications in energy, electronics, and optoelectronics have been conducted. [1,2] In particular, 2D transition metal carbides and nitrides (MXenes) are considered as emerging energy materials. Enjoying their endowments in the high hydrophilic surface, porosity, and conductivity, MXenes possess widespread applications in battery, electrocatalyst, supercapacitor, and biochemistry. [3][4][5][6][7] MXenes are usually described by a chemical formula of M n+1 X n T x (n = 1, 2, and 3), where M represents an early transition metal (such as Ti, Nb, Cr, and V.), X stands for the C and/or N element, and T x is the

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“…As such, MXenes have received great attentions in various applications such as energy storage and conversion, especially in electrocatalysis, because of their fast electron transfer, strong interfacial interaction, and large surface area . Very recently, theory calculation and experimental data indicate that some MXenes (e.g., Ti 2 CO 2 and Mo 2 CO 2 ) hold great potential as electrocatalysts for HER, in which the surficial functional groups such as oxygen atoms and hydroxyl played an important role . Taken together, coupling ultrathin Pt based nanowires with MXenes as advanced electrocatalysts for HER in both acidic and alkaline solutions is highly desirable but still remains challenging.…”

Section: Introductionmentioning

confidence: 99%

“…[38][39][40][41][42] Very recently, theory calculation and experimental data indicate that some MXenes (e.g., Ti 2 CO 2 and Mo 2 CO 2 ) hold great potential as electrocatalysts for HER, in which the surficial functional groups such as oxygen atoms and hydroxyl played an important role. [43][44][45][46][47] Taken together, coupling ultrathin Pt based nanowires with MXenes as advanced electrocatalysts for HER in both acidic and alkaline solutions is highly desirable but still remains challenging.…”

Section: Introductionmentioning

confidence: 99%

Coupling PtNi Ultrathin Nanowires with MXenes for Boosting Electrocatalytic Hydrogen Evolution in Both Acidic and Alkaline Solutions

Jiang

Yan

et al. 2019

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Developing an efficient electrocatalyst for the hydrogen evolution reaction (HER) working in both acidic and alkaline solutions is highly desirable, but still remains challenging. Here, PtxNi ultrathin nanowires (NWs) with tunable compositions (x = 1.42, 3.21, 5.67) are in situ grown on MXenes (Ti3C2 nanosheets), serving as electrocatalysts toward HER. Such PtxNi@Ti3C2 electrocatalysts exhibit excellent HER performance in both acidic and alkaline solutions, with the Pt3.21Ni@Ti3C2 being the best one. Specifically, Pt3.21Ni@Ti3C2 achieves record‐breaking performance in terms of lowest overpotential (18.55 mV) and smallest Tafel slope (13.37 mV dec−1) for HER in acidic media to date. Theory calculations and X‐ray photoelectron spectroscopy analyses demonstrate that the coupling of MXenes with the NWs not only approaches the Gibbs free energy for hydrogen adsorption close to zero through the electron transfer between them in acidic media, but also provides additional active sites for water dissociation in alkaline solution, both of them being beneficial to the HER performance.

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MXene Nanofibers as Highly Active Catalysts for Hydrogen Evolution Reaction

Cited by 199 publications

References 47 publications

Highly Enhanced Pseudocapacitive Performance of Vanadium‐Doped MXenes in Neutral Electrolytes

Highly Enhanced Pseudocapacitive Performance of Vanadium‐Doped MXenes in Neutral Electrolytes

Efficient Energy Conversion and Storage Based on Robust Fluoride‐Free Self‐Assembled 1D Niobium Carbide in 3D Nanowire Network

Coupling PtNi Ultrathin Nanowires with MXenes for Boosting Electrocatalytic Hydrogen Evolution in Both Acidic and Alkaline Solutions

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