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Interface engineering of Ag-Ni3S2 heterostructures toward efficient alkaline hydrogen evolution.
Nanoscale ( IF 5.8 ) Pub Date : 2020-08-25 , DOI: 10.1039/d0nr04855k Caichi Liu 1 , Fangqing Wang 1 , Dongbo Jia 1 , Jingqian Zhang 1 , Jingyu Zhang 1 , Qiuyan Hao 1 , Jun Zhang 2 , Ying Li 1 , Hui Liu 3
Nanoscale ( IF 5.8 ) Pub Date : 2020-08-25 , DOI: 10.1039/d0nr04855k Caichi Liu 1 , Fangqing Wang 1 , Dongbo Jia 1 , Jingqian Zhang 1 , Jingyu Zhang 1 , Qiuyan Hao 1 , Jun Zhang 2 , Ying Li 1 , Hui Liu 3
Affiliation
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Exploring Earth-abundant transition-metal-based electrocatalysts with high performance toward the alkaline hydrogen evolution reaction (HER) is crucial for sustainable hydrogen production. Ni3S2 has been recently identified as a promising HER catalyst, but it has unfavorable water dissociation and hydrogen adsorption characteristics. Here, we report Ag-decorated Ni3S2 nanosheet arrays grown on Ni Foam (NF) (Ag-Ni3S2/NF) as efficient heterostructure electrocatalysts for the HER in alkaline media. The catalyst only requires a low overpotential of 89 mV at 10 mA cm−2, as well as sustaining long-term durability for 15 h. The experimental analysis, in combination with density functional theory calculation, demonstrates that the electronic coupling at the interface between Ni3S2 and Ag results in enhanced electronic conductivity and optimized hydrogen adsorption and water adsorption/dissociation free energies. This work not only develops a highly efficient catalyst toward the HER, but also sheds light on the structure–activity relationship of the heterostructure catalyst on an atomic scale.
中文翻译：
Ag-Ni3S2异质结构向有效碱氢释放的界面工程。
探索对碱氢逸出反应（HER）具有高性能的地球上富含过渡金属的电催化剂对于可持续制氢至关重要。Ni 3 S 2最近被鉴定为有前途的HER催化剂，但是它具有不利的水离解和氢吸附特性。在这里，我们报告生长在镍泡沫（NF）（Ag-Ni 3 S 2 / NF）上的Ag装饰的Ni 3 S 2纳米片阵列，作为HER在碱性介质中的有效异质结构电催化剂。催化剂在10 mA cm -2时仅需要89 mV的低超电势，并保持15小时的长期耐用性。实验分析与密度泛函理论计算相结合，表明Ni 3 S 2和Ag界面处的电子耦合提高了电子电导率，优化了氢吸附和水吸附/解离自由能。这项工作不仅开发了一种针对HER的高效催化剂，而且还阐明了异质结构催化剂在原子尺度上的构效关系。
更新日期：2020-10-02
中文翻译：
Ag-Ni3S2异质结构向有效碱氢释放的界面工程。
探索对碱氢逸出反应（HER）具有高性能的地球上富含过渡金属的电催化剂对于可持续制氢至关重要。Ni 3 S 2最近被鉴定为有前途的HER催化剂，但是它具有不利的水离解和氢吸附特性。在这里，我们报告生长在镍泡沫（NF）（Ag-Ni 3 S 2 / NF）上的Ag装饰的Ni 3 S 2纳米片阵列，作为HER在碱性介质中的有效异质结构电催化剂。催化剂在10 mA cm -2时仅需要89 mV的低超电势，并保持15小时的长期耐用性。实验分析与密度泛函理论计算相结合，表明Ni 3 S 2和Ag界面处的电子耦合提高了电子电导率，优化了氢吸附和水吸附/解离自由能。这项工作不仅开发了一种针对HER的高效催化剂，而且还阐明了异质结构催化剂在原子尺度上的构效关系。
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