W-doped MoS2 nanosheets as a highly-efficient catalyst for hydrogen peroxide electroreduction in alkaline media
W-doped MoS2 nanosheets as a highly-efficient catalyst for hydrogen peroxide electroreduction in alkaline media
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DOI：
10.1039/c7cy01509g
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发表时间：
2017-11
影响因子：
5
通讯作者：
Yudong Xue;Weiquan Cai;S. Zheng;Wenyi Yan;Jiugang Hu;Zhi Sun;Yi Zhang;W. Jin
中科院分区：
文献类型：
--
作者：
Yudong Xue;Weiquan Cai;S. Zheng;Wenyi Yan;Jiugang Hu;Zhi Sun;Yi Zhang;W. Jin
新型 W 掺杂 MoS2 电催化剂已通过简便的一锅溶剂热法成功制备，并用于新兴碱性 H2O2 燃料电池中的过氧化氢还原反应 (HPRR)。 W 掺杂 MoS2 的宽组成化学计量以 30% 和 15% 的摩尔分数获得。研究发现，由于杂原子掺杂和纳米结构中出现的缺陷位点，30% W掺杂的MoS2表现出优异的催化活性，在-0.86 V vs. Hg/HgO时峰值电流密度为2.83 mA cm−2。此外，系统研究了碱浓度、H2O2浓度和温度对HPRR的影响。 HPRR 的机理通过使用旋转圆盘电极作为直接双电子电还原路径来说明。因此，为HPRR应用中过渡金属二硫属化物中的杂原子掺杂提供了新的见解。
Novel W-doped MoS2 electrocatalysts have been successfully fabricated through a facile one-pot solvothermal method and employed for the hydrogen peroxide reduction reaction (HPRR) in emerging alkaline H2O2-based fuel cells. The wide composition stoichiometry of W-doped MoS2 is obtained in molar fractions of 30% and 15%. It has been found that 30% W-doped MoS2 presents superior catalytic activity with a high peak current density of 2.83 mA cm−2 at −0.86 V vs. Hg/HgO, owing to the heteroatom doping and the defect sites that emerged in the nanostructure. Furthermore, the influence of alkali concentration, H2O2 concentration and temperature on the HPRR is systematically investigated. The mechanism of HPRR is illustrated using a rotating disk electrode as a direct two-electron electroreduction pathway. Thereby, a new insight into heteroatom doping in transition metal dichalcogenides for HPRR applications is provided.