Atmospheric‐Pressure Synthesis of 2D Nitrogen‐Rich Tungsten Nitride
Atmospheric‐Pressure Synthesis of 2D Nitrogen‐Rich Tungsten Nitride
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DOI：
10.1002/adma.201805655
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发表时间：
2018-10
影响因子：
29.4
通讯作者：
Huimin Yu;Xin Yang;Xu Xiao;Ming Chen;Qinghua Zhang;Liang Huang;Jiabin Wu;Tianqi Li;
中科院分区：
文献类型：
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作者：
Huimin Yu;Xin Yang;Xu Xiao;Ming Chen;Qinghua Zhang;Liang Huang;Jiabin Wu;Tianqi Li;
2D过渡金属氮化物，特别是富氮钨氮化物(WxNy，y>；x)，如W3N4和W2N3，由于其丰富的WN键大大提高了催化活性，在析氢反应(HER)中具有巨大的潜力。然而，由于WN键的形成能很大，合理地合成2D富氮氮化钨是一项具有挑战性的工作。本文采用盐模板法在常压下合成了超薄的二维六方氮化钨(h-W2N3)薄片。由于KCl和h-W2N3之间的强相互作用和结构域匹配外延，h-W2N3的形成能显著降低。2Dh-W2N3对阴极HER具有良好的催化活性，起始电位为−30.8 mV，对10 mA cm−2的过电位为−98.2 mV。
2D transition metal nitrides, especially nitrogen‐rich tungsten nitrides (WxNy, y > x), such as W3N4 and W2N3, have a great potential for the hydrogen evolution reaction (HER) since the catalytic activity is largely enhanced by the abundant WN bonding. However, the rational synthesis of 2D nitrogen‐rich tungsten nitrides is challenging due to the large formation energy of WN bonding. Herein, ultrathin 2D hexagonal‐W2N3 (h‐W2N3) flakes are synthesized at atmospheric pressure via a salt‐templated method. The formation energy of h‐W2N3 can be dramatically decreased owing to the strong interaction and domain matching epitaxy between KCl and h‐W2N3. 2D h‐W2N3 demonstrates an excellent catalytic activity for cathodic HER with an onset potential of −30.8 mV as well as an overpotential of −98.2 mV for 10 mA cm−2.