Room temperature NH3 sensing properties and humidity influence of Ti3C2Tx and Ag-Ti3C2Tx in an oxygen-free environment

Wu, Hao; Yu, Jun; Yao, Guanyu; Li, Zhongzhou; Zou, Wenjing; Li, Xiaogan; Zhu, Huichao; Huang, Zhengxing; Tang, Zhenan

doi:10.1016/j.snb.2022.132195

Cited by 23 publications

(5 citation statements)

References 51 publications

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“…The typical p-type NiCo 2 O 4 is widely used as gas sensors, although Ti 3 C 2 T x MXene also displayed p-type sensing behavior in our case [ 43 ]. So, the p–p hetero-junction based on the nanocomposite of MXene/NiCo 2 O 4 showed the p-type gas sensing mechanism.…”

Section: Resultsmentioning

confidence: 99%

H2S/Butane Dual Gas Sensing Based on a Hydrothermally Synthesized MXene Ti3C2Tx/NiCo2O4 Nanocomposite

Sadaf,

Zhang,

Akhtar

2023

Molecules

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Real-time sensing of hydrogen sulfide (H2S) at room temperature is important to ensure the safety of humans and the environment. Four kinds of different nanocomposites, such as MXene Ti3C2Tx, Ti3AlC2, WS2, and MoSe2/NiCo2O4, were synthesized using the hydrothermal method in this paper. Initially, the intrinsic properties of the synthesized nanocomposites were studied using different techniques. P-type butane and H2S-sensing behaviors of nanocomposites were performed and analyzed deeply. Four sensor sheets were fabricated using a spin-coating method. The gas sensor was distinctly part of the chemiresistor class. The MXene Ti3C2Tx/NiCo2O4-based gas sensor detected the highest response (16) toward 10 ppm H2S at room temperature. In comparison, the sensor detected the highest response (9.8) toward 4000 ppm butane at 90 °C compared with the other three fabricated sensors (Ti3AlC2, WS2, and MoSe2/NiCo2O4). The MXene Ti3C2Tx/NiCo2O4 sensor showed excellent responses, minimum limits of detection (0.1 ppm H2S and 5 ppm butane), long-term stability, and good reproducibility compared with the other fabricated sensors. The highest sensing properties toward H2S and butane were accredited to p–p heterojunctions, higher BET surface areas, increased oxygen species, etc. These simply synthesized nanocomposites and fabricated sensors present a novel method for tracing H2S and butane at the lowest concentration to prevent different gas-exposure-related diseases.

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Section: Resultsmentioning

confidence: 99%

H2S/Butane Dual Gas Sensing Based on a Hydrothermally Synthesized MXene Ti3C2Tx/NiCo2O4 Nanocomposite

Sadaf,

Zhang,

Akhtar

2023

Molecules

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“…The tunability of M, X, and T elements in MXene is conducive to the regulation of electronic structure, which can improve the adsorption and desorption behavior of reaction intermediates at single-atom sites and reduce the electrocatalytic reaction barrier. [115] Copyright 2022, Elsevier. e) Schematic diagram of the synthesis of Pt SA-Ti 3 C 2 T x .…”

Section: Discussionmentioning

confidence: 99%

“…Side view (left) and top view (right) of minimum energy configurations for NH 3 adsorbed on a) Ti 3 C 2 O 2 , b) Ti 3 C 2 O 2 with pre‐adsorbed H 2 O, c) Ag–Ti 3 C 2 O 2 , and d) Ag–Ti 3 C 2 O 2 with pre‐adsorbed H 2 O. Reproduced with permission. [ 115 ] Copyright 2022, Elsevier. e) Schematic diagram of the synthesis of Pt SA–Ti 3 C 2 T x .…”

Section: Applications Of Mxene‐based Sacsmentioning

confidence: 99%

“…Wu et al fixed Ag onto the surface of oxygen‐rich Ti 3 C 2 T x via a self‐reduction method, and tested the NH 3 sensor preformation of in dry and wet nitrogen, respectively. [ 115 ] At the humidity of 40% relative humidity, the response sensitivity of Ag–Ti 3 C 2 to NH 3 was the highest, which was attributed to the affinity between intercalated water and NH 3 . However, excessive water would hinder the adsorption of NH 3 at the active site.…”

Section: Applications Of Mxene‐based Sacsmentioning

confidence: 99%

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Applications of MXene‐Based Single‐Atom Catalysts

Bai

Guan

2023

Small Structures

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Catalytic science, including heterogeneous catalysis, homogeneous catalysis, and enzyme catalysis, is involved in various fields of production and life, including energy, pharmaceuticals, environmental protection and so on. Thereinto, heterogeneous catalysis, which is usually driven by metal-based catalysts, effectively reduces production costs due to its easy recovery nature and thus plays a dominant role in industrial production. However, the distribution of active sites in heterogeneous catalysts is uncontrollable, and it is difficult to utilize the structure-activity relationship to adjust the catalyst performance. Through reducing the size of the nonmetallic catalyst and increasing the exposure of the active site, the catalytic performance can be significantly improved. Thus, design and synthesis of catalysts on atomic scale is an efficient strategy to improve catalytic activity.In 2011, Zhang et al. prepared atomically dispersed Pt species and proposed the concept of single-atom (SA) catalyst for the first time, defining single-atom catalysts (SACs) as a supported catalyst in which metal species are dispersed in the form of isolated atoms. [1] Compared with traditional catalysts, SACs have an atomic utilization efficiency of 100%, and can achieve high catalytic performance under low metal load, which greatly reduces the production cost. [2] Shi et al. loaded only 4.1 wt% Pt SAs on the surface of MoSe 2 , showing excellent alkaline electrocatalytic hydrogen evolution performance. [3] In addition, SACs have the properties of reusability and controllable structure, which combine the advantages of homogeneous and heterogeneous catalysis. [4,5] Usually, single-metal sites have uniform and adjustable coordination structures, showing the superiority of catalyzing specified reactions and improving product selectivity. By changing the activation temperature, Ren et al. synthesized Pt SAs with different electronic environment and oxidation state on Fe 2 O 3 in a controllable manner. [6] Moreover, Pd SAs with different coordination are synthesized by replacing different organic ligands, and the Pd@POL-1 coordinated with organic phosphine showed high catalytic selectivity for the hydrosilylation reaction of internal alkyne. [7] Due to the high cohesive energy, individual metal atoms tend to aggregate to form nanoclusters. [8] To obtain stable and highly dispersed metal atoms, it is usually necessary to anchor the isolated metal atoms onto a substrate, where strong charge transfer would occur through the bonding of the metal atoms to the reactive sites on the substrate. Metal oxide, metal-organic framework, molybdenum disulfide, graphene, and so on are common carriers that can be used to fix metal atoms. [9][10][11][12][13] Among them, 2D materials show good application prospects due to large specific surface area. [14,15] As a new type of 2D materials, metallic carbides, nitrides, or carbonic nitrides (MXenes), with the general structure of M n þ 1 X n T x , where M is transition metal (TM), X is carbon/nitrogen elemen...

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“…[157] Meanwhile, when the metal single atom is modified on the Ti 3 C 2 T x , the surface of SACs has higher oxidation degree, more defects, and higher responses to NH 3 than bare Ti 3 C 2 T x . [158] And more information about single atom modified MXene has been fully described in the previous section.…”

Section: Defect Engineeringmentioning

confidence: 99%

Structure Regulation of Single‐atom Catalysts for Electrocatalytic Sensing

Shu,

Mo,

Gao

2024

ChemCatChem

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Single‐atom catalysts (SACs) have received extensive attention in the fields of electrocatalytic sensing, and in response to the requirements of different sensing systems, a variety of metal single‐atom structures have been emerged. In this review, we at first introduce the current mainstream synthesis methods of SACs, and then focus on the structural regulation strategies of SACs and the structure‐performance relationship generated in electrocatalytic sensing. It is worth noting that we classify the regulation engineering of single‐atom structures and describe the corresponding enhanced performance of electrocatalytic sensing, which makes up for the shortcomings of reviews in this field. Eventually, the opportunities and challenges of SACs based electrochemical sensors are outlined.

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Room temperature NH3 sensing properties and humidity influence of Ti3C2Tx and Ag-Ti3C2Tx in an oxygen-free environment

Cited by 23 publications

References 51 publications

H2S/Butane Dual Gas Sensing Based on a Hydrothermally Synthesized MXene Ti3C2Tx/NiCo2O4 Nanocomposite

H2S/Butane Dual Gas Sensing Based on a Hydrothermally Synthesized MXene Ti3C2Tx/NiCo2O4 Nanocomposite

Applications of MXene‐Based Single‐Atom Catalysts

Structure Regulation of Single‐atom Catalysts for Electrocatalytic Sensing

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