Advanced Energy Materials
·
2021
·Vol. 12
·期 1
·2102359
·
IF 29.368
Yuan Chang,Panlong Zhai,Jungang Hou,Jijun Zhao,Junfeng Gao
Faced with grave climate change and enormous energy demands, effective catalysts have become more and more important due to their significant effects on reducing fossil fuels consumption. The hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) by water splitting are feasible ways to produce clean sustainable energy. Here, atomic structures and related scanning tunneling microscope images of Se defects in PtSe 2 are systematically explored. The equilibrium fractions of vacancies under variable conditions are predicted in detail. In addition, it is found that the vacancies are highly kinetically stable, without recovering or aggregation. The Se vacancies in PtSe 2 can dramatically enhance the HER performance, comparing to Pt(111). It is also revealed that a PtSe 2 monolayer with Se vacancies is also a good OER catalyst. The excellent bipolar catalysis of Se vacancies is further confirmed by experimental measurements. A defective PtSe 2 made via direct selenization of Pt foil at 773 K using a chemical vapor deposition process is produced. It is shown that the HER and OER performance of defective PtSe 2 is much more efficient than Pt foils by a series of measurements. This work, with its compelling theoretical and experimental studies indicates PtSe 2 with Se defects is an ideal bipolar candidate for HER and OER.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Bing Hao,Manyuan Gan,Jingjing Guo,Guoshen Li,Yanhui Song,Yongqing Shen,Bingshe Xu,Peizhi Liu,Junjie Guo
The rational design and fabrication of 2D heterojuctions are proven a promising strategy for boosting the performance of electrocatalysts. Although 2D platinum diselenide (PtSe 2 ) exhibits catalytic activity for hydrogen evolution reaction (HER), the catalytic performance is still unsatisfactory due to its inert basal plane, wide bandgap, and poor electron transfer ability. Herein, a new strategy is reported to construct PtSe 2 /PtCo heterojunctions by partial selenization of PtCo alloy for high-efficiency HER electrocatalyst, which exhibits a low overpotential of 38 mV at the current density of 10 mA cm −2 , a small Tafel slope of 22 mV dec −1 , and a superior stability over 24 h and 1000 cycles. The outstanding HER activity of the catalyst arises from the strong electronic interactions between PtSe 2 and PtCo in the heterojunctions, which induce electron transferring from PtSe 2 to PtCo and the d-band center down shifting, and thus optimize the H * adsorption/desorption. This work provides a novel strategy for constructing highly efficient heterostructure electrocatalysts, which facilitates the applications of hydrogen energy conversion.
研究领域:
材料科学
·
电化学
·
催化
✓ 已验证
产品关联
DOI
高影响因子
Advanced Optical Materials
·
2023
·Vol. 12
·期 7
·2302140
·
IF 9
Zhen-Long Dou,Li Cheng,Zhi-Yong Wu,Li-Jiong Chen,Li Zhou,Qu-Quan Wang
Favorable growth of asymmetric hetero-nanostructures consisting of plasmonic metals and semiconductors or topological nanomaterials is highly desired because the performance of nonlinear optical antennas is closely related to their composition and morphology symmetry. In this work, two methods are proposed to overgrow PtSe 2 , a semiconductor or topological semimetal material, onto Au nanorods (AuNRs) to form Au/AuPt/PtSe 2 and Au/AgPtSe 2 heterorods via wet chemical technique. Both Au/AuPt/PtSe 2 and Au/AgPtSe 2 heterorods show asymmetric morphologies: the Au/AuPt/PtSe 2 heterorods show a partially hollow morphology with an etched AuNR coated by AuPt and PtSe 2 shells; the Au/AgPtSe 2 heterorods prepared by Ag-mediated overgrowth method have a toothbrush shape with AgPtSe 2 attached on the side surface near one end of AuNRs. The two asymmetric heterorods show significantly enhanced nonlinear radiations of second harmonic generation with the excitation laser wavelength tuning from 1220 to 1315 nm, and a maximal nonlinear enhancement factor of 16 is achieved, which is attributed to the interaction of gold core with platinum selenide shell and the broken symmetry of heterostructures. The findings provide a strategy to prepare metal-topological heterostructures as optical antennas with optimized performance in the application of nonlinear photonic nanodevices.
✓ 已验证
产品关联
DOI
高影响因子
Advanced Electronic Materials
·
2024
·Vol. 11
·期 2
·2400268
·
IF 5.3
Zhiyuan Dai,Yu Yu,Haibiao Guan,Ruowen Wang,Tao Ye,Yonghao Bu,Jie Deng,Mengdie Shi,Rui Xin,Tianxin Li,Haibo Shu,Xiaoshuang Chen,Jing Zhou
Room-temperature blackbody-sensitive infrared photodetectors with ultra-broadband and ultrafast photoresponses are highly desired in numerous scientific and technical fields. However, it is challenging for an infrared photodetector to simultaneously possess all the aforementioned characteristics. In this study, a room-temperature Te/PtSe 2 heterostructure photodetector is established to address this challenge, utilizing the built-in field of the heterostructure, the crossing conduction and valence bands of PtSe 2 , the high mobilities of both materials, and a considerable photogain. The device is photoresponsive over the ultrabroad wavelength range (519 nm–10 µm). The peak responsivity and specific detectivity reach 196.8 A W −1 , and 4.3 × 10 9 cm Hz 1/2 W −1 , respectively, at the wavelength of 3.32 µm. The device also exhibits blackbody sensitivity, with a responsivity of 24.8 A W −1 , and a specific detectivity of 7.4 × 10 8 cm Hz 1/2 W −1 . The photoresponse is ultrafast, corresponding to a 3 dB bandwidth of 160 kHz. The study provides new possibilities for high-performance room-temperature infrared detection.
研究领域:
光电子学
·
红外光子学
·
纳米材料
·
半导体器件
·
异质结构物理
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）