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Two-Dimensional Metallic NiTe2 with Ultrahigh Environmental Stability, Conductivity, and Electrocatalytic Activity.
ACS Nano ( IF 15.8 ) Pub Date : 2020-06-24 , DOI: 10.1021/acsnano.0c03940 Jianping Shi 1, 2 , Yahuan Huan 1 , Mengmeng Xiao 3 , Min Hong 1 , Xiaoxu Zhao 4 , Yinlu Gao 5 , Fangfang Cui 1 , Pengfei Yang 1 , Stephen John Pennycook 4 , Jijun Zhao 5 , Yanfeng Zhang 1
ACS Nano ( IF 15.8 ) Pub Date : 2020-06-24 , DOI: 10.1021/acsnano.0c03940 Jianping Shi 1, 2 , Yahuan Huan 1 , Mengmeng Xiao 3 , Min Hong 1 , Xiaoxu Zhao 4 , Yinlu Gao 5 , Fangfang Cui 1 , Pengfei Yang 1 , Stephen John Pennycook 4 , Jijun Zhao 5 , Yanfeng Zhang 1
Affiliation
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Two-dimensional (2D) metallic transition metal dichalcogenides (MTMDCs) supply a versatile platform for investigating newfangled physical issues and developing potential applications in electronics/spintronics/electrocatalysis. Among these, NiTe2 (a type-II Dirac semimetal) possesses a Dirac point near its Fermi level. However, as-prepared 2D MTMDCs are mostly environmentally unstable, and little attention has been paid to synthesizing such materials. Herein, a general chemical vapor deposition (CVD) approach has been designed to prepare thickness-tunable and large-domain (∼1.5 mm) 1T-NiTe2 on an atomically flat mica substrate. Significantly, ultrahigh conductivity (∼1.15 × 106 S m–1) of CVD-synthesized 1T-NiTe2 and high catalytic activity in pH-universal hydrogen evolution reaction have been uncovered. More interestingly, the 2D 1T-NiTe2 maintains robust environmental stability for more than one year and even after a variety of harsh treatments. These results hereby fill an existing research gap in synthesizing environmentally stable 2D MTMDCs, making fundamental progress in developing 2D MTMDC-based devices/catalysts.
中文翻译：
具有超高环境稳定性，电导率和电催化活性的二维金属NiTe2。
二维（2D）金属过渡金属二硫化碳（MTMDC）为研究新奇的物理问题和开发在电子/自旋电子学/电催化方面的潜在应用提供了一个多功能平台。其中，NiTe 2（II型狄拉克半金属）在费米能级附近具有狄拉克点。但是，所制备的2D MTMDC大多在环境上不稳定，并且很少关注合成此类材料。本文中，已经设计了一种普通的化学气相沉积（CVD）方法，以在原子平坦的云母基板上制备厚度可调且大畴（约1.5 mm）的1T-NiTe 2。值得注意的是，CVD合成的1T-NiTe 2的超高电导率（〜1.15×10 6 S m –1）并已发现在pH值普遍的析氢反应中具有高催化活性。更有趣的是，即使经过各种苛刻的处理，2D 1T-NiTe 2仍能保持稳定的环境稳定性超过一年。因此，这些结果填补了合成环境稳定的2D MTMDC方面的现有研究空白，从而在开发基于2D MTMDC的设备/催化剂方面取得了根本性进展。
更新日期：2020-07-28
中文翻译：
具有超高环境稳定性，电导率和电催化活性的二维金属NiTe2。
二维（2D）金属过渡金属二硫化碳（MTMDC）为研究新奇的物理问题和开发在电子/自旋电子学/电催化方面的潜在应用提供了一个多功能平台。其中，NiTe 2（II型狄拉克半金属）在费米能级附近具有狄拉克点。但是，所制备的2D MTMDC大多在环境上不稳定，并且很少关注合成此类材料。本文中，已经设计了一种普通的化学气相沉积（CVD）方法，以在原子平坦的云母基板上制备厚度可调且大畴（约1.5 mm）的1T-NiTe 2。值得注意的是，CVD合成的1T-NiTe 2的超高电导率（〜1.15×10 6 S m –1）并已发现在pH值普遍的析氢反应中具有高催化活性。更有趣的是，即使经过各种苛刻的处理，2D 1T-NiTe 2仍能保持稳定的环境稳定性超过一年。因此，这些结果填补了合成环境稳定的2D MTMDC方面的现有研究空白，从而在开发基于2D MTMDC的设备/催化剂方面取得了根本性进展。
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