Antimony-doped tin oxide as an efficient electrocatalyst toward the VO2+/VO2+ redox couple of the vanadium redox flow battery,Catalysis Science & Technology

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Antimony-doped tin oxide as an efficient electrocatalyst toward the VO2+/VO2+ redox couple of the vanadium redox flow battery
Catalysis Science & Technology ( IF 4.4 ) Pub Date : 2020-03-06 , DOI: 10.1039/c9cy01793c
Yang Lv _{1,

2,

3,

4,

5} , Chunmei Yang _{1,

2,

3,

4,

5} , Haining Wang _{1,

2,

3,

4,

5} , Jin Zhang _{1,

2,

3,

4,

5} , Yan Xiang _{1,

2,

3,

4,

5} , Shanfu Lu _{1,

2,

3,

4,

5}

Affiliation

The low electronic conductivity of metallic oxides limits their electrocatalytic activity toward the VO²⁺/VO₂⁺ redox reaction in a vanadium redox flow battery (VRFB). In this work, antimony-doped tin oxide (ATO) nanoparticles achieve higher electronic conductivity than tin dioxide nanoparticles. In addition, the doped Sb(V) enhances the negative charge on the surface of the SnO₂, which contributes to adsorption of vanadium ions on the ATO surface. As a result, the reversibility of the VO²⁺/VO₂⁺ redox reaction on ATO is much better than that on SnO₂. The energy efficiency of the VRFB with optimized ATO nanoparticle loading on graphite felts is improved to 73.09% in comparison with that with pristine graphite felt (61.00%) or SnO₂ nanoparticle-coated graphite felt (65.47%) at 300 mA cm⁻². Thus, ATO nanoparticle-coated graphite felt is a desirable positive electrode for VRFB applications.

中文翻译：

掺杂锑的氧化锡可作为钒氧化还原液流电池中VO2 + / VO2 +氧化还原对的有效电催化剂

金属氧化物的低电子电导率限制了它们对钒氧化还原液流电池（VRFB）中VO ²⁺ / VO ₂⁺氧化还原反应的电催化活性。在这项工作中，掺锑的氧化锡（ATO）纳米粒子比二氧化锡纳米粒子具有更高的电子传导性。另外，掺杂的Sb（V）增强了SnO ₂表面上的负电荷，这有助于钒离子在ATO表面上的吸附。结果，ATO上的VO ²⁺ / VO ₂⁺氧化还原反应的可逆性比SnO ₂上的要好得多。。在300 mA cm ^-2下，与原始石墨毡（61.00％）或SnO ₂纳米颗粒涂覆的石墨毡（65.47％）相比，在石墨毡上优化ATO纳米颗粒负载的VRFB的能效提高到73.09％。因此，ATO纳米颗粒涂覆的石墨毡是VRFB应用的理想正极。

更新日期：2020-03-06

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