Fe-doped Ni0.85Se nanospheres interspersed into carbon nanotubes as efficient and stable electrocatalyst for overall water splitting
Fe-doped Ni0.85Se nanospheres interspersed into carbon nanotubes as efficient and stable electrocatalyst for overall water splitting
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DOI：
10.1016/j.electacta.2021.138452
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发表时间：
2021-04
影响因子：
6.6
通讯作者：
Guigui Liu;C. Shuai;Z. Mo;R. Guo;Nijuan Liu;Qibing Dong;Jia Wang;Hebing Pei;Wentong Liu
中科院分区：
文献类型：
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作者：
Guigui Liu;C. Shuai;Z. Mo;R. Guo;Nijuan Liu;Qibing Dong;Jia Wang;Hebing Pei;Wentong Liu
开发和制备稳定、高效的非贵金属电催化剂是实现水裂解的关键。本文中，制备了一系列Fe掺杂的Ni 0.85Se合金。（FexNi 0.85-xSe，x= 0.02，0.04，0.05，0.06，0.08，0.1，0.15，0.2，0.3和0.4）的催化剂，并将其作为高活性的双功能催化剂用于析氧和析氢反应在电解水分解中。结果表明，适当的掺杂可以使不同金属离子之间产生协同效应，提高催化剂的性能。最佳的Fe_（0.08）Ni_（0.77）Se样品具有优异的OER和HER活性。随后，碳纳米管（CNT）的引入形成Fe 0. 08 Ni 0. 77 Se/CNT复合材料，由于碳纳米管网络的高导电性，进一步增强了电催化活性。在10 mA cm− 2电流密度下，Fe0.08Ni0.77Se/CNT 3复合材料的过电位分别为204 mV和108 mV，其Tafel斜率分别为58 mV dec− 1和59 mV dec− 1。结果表明，Fe0.08Ni0.77Se/CNT 3是一种优良的双功能催化剂，为电催化水裂解提供了一种很有前途的候选催化剂。
Developing and preparation of stable and efficient non-noble metal electrocatalysts is vital for overall water splitting. Herein, a series of Fe-doped Ni0.85Se (FexNi0.85-xSe,x= 0.02, 0.04, 0.05, 0.06, 0.08, 0.1, 0.15, 0.2, 0.3 and 0.4) catalysts are synthesized successfully by one-step hydrothermal method and studied as high active bifunctional catalyst for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) in electrolysis water splitting. The results indicates that a suitable doping can make different metal ions have a synergistic effect and improve catalytic performance. The optimal Fe0.08Ni0.77Se sample shows excellent OER and HER activities. Subsequently, the introduction of carbon nanotubes (CNTs) forming Fe0.08Ni0.77Se/CNT composite further enhances the electrocatalytic activity due to high electric conductivity of carbon nanotubes network. The resulted Fe0.08Ni0.77Se/CNT3composite exhibits smaller overpotential of 204 mV and 108 mV at a current density of 10 mA cm−2and a low Tafel slope of 58 mV dec−1and 59 mV dec−1than that of other composites for OER and HER, respectively. The results demonstrate that Fe0.08Ni0.77Se/CNT3is an excellent bifunctional catalyst, providing a promising candidate for electrocatalytic water splitting.