化工新型材料

化工新型材料 ›› 2021, Vol. 49 ›› Issue (6) : 117-120. DOI: 10.19817/j.cnki.issn 1006-3536.2021.06.026

新材料与新技术

氮掺杂二硫化钨纳米线阵列的制备及其高效碱性电催化析氢研究

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Preparation of N-doped WS₂ nanowire arrays and its excellent electrocatalytic hydrogen evolution in alkaline

Cao Maoqi, Sun Sailan, Long Chengmei, Luo Jun, Wu Dawang

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Received		Published
2021-01-03		2021-06-20
Issue Date	Revised Date
2021-06-29	2021-01-03

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摘要

WS₂是一种有前景的非贵金属析氢电催化剂,实验和理论计算表明其在酸性条件下具有较好的析氢催化活性。但在碱性条件下其析氢性能较差,过高的水解离能垒是限制其碱性析氢活性的一个关键因素。掺杂是一种常用的调节催化剂水解离能垒的有效方法,考虑到N原子具有较小的原子半径和更强的电负性,在WS₂中掺杂非金属N可能是一种相对容易实现的方案。X射线衍射、扫描电镜、X射线光电子能谱等分析测试表明,合成了N掺杂的WS₂纳米线阵列(N-WS₂)。变温反应速率及电化学阻抗谱测试表明,相比于WS₂纳米线阵列,N-WS₂纳米线阵列具有明显降低的水解离能垒,其碱性析氢活性大大增强。在1mol/L KOH溶液中,电流密度为10mA/cm²时,其过电位仅为115mV、塔菲斜率为73mV/dec,明显优于WS₂纳米线阵列的292mV、137mV/dec。通过掺杂调节碱性电催化剂水解离能垒的设计理念为碱性析氢电催化剂的合理设计提供了一条可能的有效途径。

Abstract

WS₂ is a promising non-noble metal electrocatalyst for hydrogen evolution.Experiments and theoretical calculations have proved that WS₂ has good catalytic activity in acidic condition.However,its hydrogen evolution performance is poor in alkaline conditions,the high energy barrier of water dissociation is the key factor limiting its activity in basic hydrogen evolution.Doping is a commonly used effective method to regulate the energy barrier of water dissociation.Considering nitrogen has smaller atomic radius and stronger electronegativity,doping nonmetallic N in WS₂ may be a relatively easy solution.X-ray crystal structure (XRD),scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) tests showed that N-doped WS₂ (N-WS₂) nanowire arrays was successfully synthesized.Compared to the WS₂ nanowire arrays,the reaction rate under different temperatures and electrochemical impedance spectroscopy tests showed that N-WS₂ nanowire arrays had significantly reduced energy barrier of water dissociation,the alkaline hydrogen evolution ctivity of N-WS₂ nanowire arrays was greatly enhanced.In solution of 1mol/L KOH,it needed only 115mV to reach the current density of 10mA/cm² and the Tafel slope was only 73 mV/dec,which was significantly better than the WS₂ (292mV,137mV/dec) nanowire arrays.The design concept of adjusting the energy barrier of water dissociation by doping provided a possible and effective way for the rational design of basic electrocatalyst for hydrogen evolution.

关键词

掺杂 / 氮掺杂二硫化钨纳米线阵列 / 碱性析氢

Key words

doping / N-WS₂ nanowire array / hydrogen evolution in alkaline

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氮掺杂二硫化钨纳米线阵列的制备及其高效碱性电催化析氢研究[J]. 化工新型材料, 2021, 49(6): 117-120 DOI:10.19817/j.cnki.issn 1006-3536.2021.06.026

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