Synergistic effect of iron diselenide decorated multi-walled carbon nanotubes for enhanced heterogeneous electron transfer and electrochemical hydrogen evolution
Synergistic effect of iron diselenide decorated multi-walled carbon nanotubes for enhanced heterogeneous electron transfer and electrochemical hydrogen evolution
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DOI：
10.1016/j.electacta.2018.03.064
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发表时间：
2018-04
影响因子：
6.6
通讯作者：
Swagotom Sarker;Pavan Chaturvedi;Litao Yan;Tom Nakotte;Xinqi Chen;Stephanie Richins;S. Das;Jonathan E.
中科院分区：
文献类型：
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作者：
Swagotom Sarker;Pavan Chaturvedi;Litao Yan;Tom Nakotte;Xinqi Chen;Stephanie Richins;S. Das;Jonathan E.
二硒化铁（FeSe 2）作为潜在有用的电极材料最近受到关注。本文首次证明了多壁碳纳米管（MWCNT）与FeSe 2以MWCNT/FeSe 2复合物的形式在酸性介质中对[Ru（NH3）6]3+/2+氧化还原探针的非均相电子转移（HET）反应和电化学析氢反应（HER）的协同效应。采用一锅法水热合成了FeSe 2和MWCNT/FeSe 2复合材料。虽然所有的电极材料（原始MWCNT、FeSe 2和MWCNT/FeSe 2）都表现出准可逆的电极行为，但MWCNT/FeSe 2具有较小的峰分离电位，并表现出增强的HET速率常数，k 0 = 5.4 × 10−3cm/s，分别是FeSe 2和MWCNT的3.2倍和1.6倍。类似地，复合材料的HER性能证明了70 mV/dec的较小Tafel斜率和降低的过电位。我们预计，这种有前途的结果可以进一步改善，通过采用不同形态的FeSe 2和工程相互作用与其他导电支持适合其应用在电化学传感和能量转换。
Iron diselenide (FeSe2) has been of recent interest as a potentially useful electrode material. Here we demonstrate, for the first time, the synergistic effect between multi-walled carbon nanotubes (MWCNT) and FeSe2in a form of MWCNT/FeSe2composite, for the heterogeneous electron transfer (HET) reaction with the [Ru(NH3)6]3+/2+redox probe and the electrochemical hydrogen evolution reaction (HER) in acidic media. Plain FeSe2and the MWCNT/FeSe2composite were synthesized using a one-pot hydrothermal method. Although all electrode materials (pristine MWCNT, FeSe2, and MWCNT/FeSe2) show a quasi-reversible electrode behavior, MWCNT/FeSe2has a smaller peak separation potential and exhibits an enhanced HET rate constant,k0= 5.4 × 10−3cm/s, which is 3.2 and 1.6 times higher than that of FeSe2and MWCNT, respectively. Similarly, the HER performance of the composite demonstrates a smaller Tafel slope of 70 mV/dec and a reduced overpotential. We anticipate that such promising outcome can be further improved by employing different morphologies of FeSe2and engineered interaction with other conductive supports suitable for their applications in electrochemical sensing and energy conversion.