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(Ni,Co)Se@Ni(OH)2 heterojunction nanosheets as an efficient electrocatalyst for the hydrogen evolution reaction
Dalton Transactions ( IF 3.5 ) Pub Date : 2020-12-8 , DOI: 10.1039/d0dt03654d Yunmei Du 1, 2, 3, 4, 5 , Huimin Zhao 1, 2, 3, 4, 5 , Wensi Wang 1, 2, 3, 4, 5 , Yu Yang 1, 2, 3, 4, 5 , Minghui Wang 1, 2, 3, 4, 5 , Shaoxiang Li 5, 6, 7, 8, 9 , Yanru Liu 1, 2, 3, 4, 5 , Lei Wang 1, 2, 3, 4, 5
Dalton Transactions ( IF 3.5 ) Pub Date : 2020-12-8 , DOI: 10.1039/d0dt03654d Yunmei Du 1, 2, 3, 4, 5 , Huimin Zhao 1, 2, 3, 4, 5 , Wensi Wang 1, 2, 3, 4, 5 , Yu Yang 1, 2, 3, 4, 5 , Minghui Wang 1, 2, 3, 4, 5 , Shaoxiang Li 5, 6, 7, 8, 9 , Yanru Liu 1, 2, 3, 4, 5 , Lei Wang 1, 2, 3, 4, 5
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A heterogeneous structure formed by coupling two or more phases can reinforce the activity of active sites and expedite electron transfer, which is conducive to boosting its electrocatalytic activity. Herein, we designed nickel foam supported (NiCo2)Se@Ni(OH)2 (NCS@NH) heterojunction nanosheets by a two-step method. First of all, the NiCo2S4@Ni(OH)2 (NiCo2S4@NH) nanosheets coated on nickel foam were acquired via a hydrothermal method. In the selenization treatment that followed, NiCo2S4@NH was converted into NCS@NH heterogeneous nanosheets in which the selenide nanoparticles decorated on the surface of the Ni(OH)2 nanosheets formed heterojunction interfaces, and the heterogeneous structure could accelerate electron transfer, thus improving the catalytic activity. The Ni(OH)2 nanosheets can adequately contact the electrolyte and promote the decomposition of water. Meanwhile, the thickness of the Ni(OH)2 nanosheets gradually decreases with the increase of Co doping (1.5–2.5 mmol), consequently affecting the HER properties. Notably, when the amount of Co salt added is 2 mmol, NCS@NH exhibited superior HER properties (with a voltage of 253 mV at 100 mA cm−2) and excellent stability for 24 h.
中文翻译：
（Ni，Co）Se @ Ni（OH）2异质结纳米片作为产氢反应的有效电催化剂
通过耦合两个或多个相形成的异质结构可以增强活性位点的活性并加快电子转移，这有利于增强其电催化活性。在这里，我们通过两步法设计了泡沫镍负载的（NiCo 2）Se @ Ni（OH）2（NCS @ NH）异质结纳米片。首先，通过水热法获得了涂覆在泡沫镍上的NiCo 2 S 4 @Ni（OH）2（NiCo 2 S 4 @NH）纳米片。在随后的硒化处理中，NiCo 2 S 4将@NH转换为NCS @ NH异质纳米片，其中装饰在Ni（OH）2纳米片表面上的硒化物纳米粒子形成异质结界面，并且该异质结构可以加速电子转移，从而提高催化活性。Ni（OH）2纳米片可以充分接触电解质并促进水的分解。同时，Ni（OH）2纳米片的厚度随着Co掺杂（1.5-2.5 mmol）的增加而逐渐减小，从而影响HER性能。值得注意的是，当Co盐的添加量为2mmol时，NCS @ NH表现出优异的HER性能（在100mA cm -2下具有253mV的电压）和24小时的优异稳定性。
更新日期：2020-12-17
中文翻译：
（Ni，Co）Se @ Ni（OH）2异质结纳米片作为产氢反应的有效电催化剂
通过耦合两个或多个相形成的异质结构可以增强活性位点的活性并加快电子转移，这有利于增强其电催化活性。在这里，我们通过两步法设计了泡沫镍负载的（NiCo 2）Se @ Ni（OH）2（NCS @ NH）异质结纳米片。首先，通过水热法获得了涂覆在泡沫镍上的NiCo 2 S 4 @Ni（OH）2（NiCo 2 S 4 @NH）纳米片。在随后的硒化处理中，NiCo 2 S 4将@NH转换为NCS @ NH异质纳米片，其中装饰在Ni（OH）2纳米片表面上的硒化物纳米粒子形成异质结界面，并且该异质结构可以加速电子转移，从而提高催化活性。Ni（OH）2纳米片可以充分接触电解质并促进水的分解。同时，Ni（OH）2纳米片的厚度随着Co掺杂（1.5-2.5 mmol）的增加而逐渐减小，从而影响HER性能。值得注意的是，当Co盐的添加量为2mmol时，NCS @ NH表现出优异的HER性能（在100mA cm -2下具有253mV的电压）和24小时的优异稳定性。
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