Heterogeneous interface-induced electrocatalytic efficiency boosting of bimetallic Cu/Zn selenides for stable water oxidation and oxygen reduction reactions

Muthuraja Velpandian; Sairam K. Malladi; Govind Ummethala

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Heterogeneous interface-induced electrocatalytic efficiency boosting of bimetallic Cu/Zn selenides for stable water oxidation and oxygen reduction reactions

机译：Heterogeneous interface-induced electrocatalytic efficiency boosting of bimetallic Cu/Zn selenides for stable water oxidation and oxygen reduction reactions

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An increased emphasis on alternative energy technologies paves the way for the design and development of highly active, cost-effective electrocatalysts for application in water splitting and fuel cells. In lieu of this, we evaluated heterostructured copper selenide and zinc selenide enwrapped in carbon nanofibers (CZSe@C-450) as bifunctional electrocatalysts synthesized by electrospinning and selenization. CZSe@C-450 demonstrated superior electrochemical performance with a low overpotential of 260 mV at 10 mA cm~(-2), high stability (1.2% loss in 12 hours and 9.9% loss in 50 hours) for oxygen evolution reaction, a half-wave potential (E1/2) of 0.88 V, and high stability (14.35% loss in 50 hours) for oxygen reduction reaction. The enhanced performance is attributed to the formation of a heterogeneous phase boundary between copper selenide and zinc selenide, which increases both the built-in potential and local atomic disorder. The lattice mismatch/disorder reduces the surface energy and leads to the creation of an ample number of active sites that participate in both oxygen evolution and reduction reactions.

机译：强调增加替代能源设计和技术铺平了道路高度活跃的发展,符合成本效益的electrocatalysts应用在水里分裂和燃料电池。用铜硒化和评估硒化锌包裹在纳米碳纤维双官能electrocatalysts (czse@c - 450)合成了电纺和selenization。czse@c - 450显示优越的电化学性能超电势低260 mV马10厘米~(2)、高稳定性(12 1.2%的损失小时,在50小时)氧9.9%的损失进化的反应,半波电位(E1/2)0.88 V, 50和高稳定性(14.35%亏损小时)对氧还原反应。增强的性能是由于异构的相界面的形成硒化铜和硒化锌之间增加两个内置的潜在的和地方原子紊乱。降低了表面能和领导创建一个充足数量的活跃的站点参与氧进化和还原反应。

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来源
《Catalysis science & technology》 |2022年第17期|5302-5314|共13页
作者
Muthuraja Velpandian; Sairam K. Malladi; Govind Ummethala;
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作者单位

Department of Chemical Engineering, Indian Institute of Technology Hyderabad, Kandi, Sangareddy-502284, Telangana, India.;

Department of Materials Science and Metallurgical Engineering, Indian Institute of Technology Hyderabad, Kandi, Sangareddy-502284, Telangana, India;

Department of Materials Science and Metallurgical Engineering, Indian Institute of Technology Hyde;

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中图分类物理化学（理论化学）、化学物理学;
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Heterogeneous interface-induced electrocatalytic efficiency boosting of bimetallic Cu/Zn selenides for stable water oxidation and oxygen reduction reactions

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