Tailoring the Morphology of Cost-Effective Vanadium Diboride Through Cobalt Substitution for Highly Efficient Alkaline Water Oxidation,Inorganic Chemistry

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Tailoring the Morphology of Cost-Effective Vanadium Diboride Through Cobalt Substitution for Highly Efficient Alkaline Water Oxidation
Inorganic Chemistry ( IF 4.3 ) Pub Date : 2021-12-02 , DOI: 10.1021/acs.inorgchem.1c03374
Ebrahim Sadeghi _{1,

2} , Naeimeh Sadat Peighambardoust ₁ , Umut Aydemir _{1,

3}

Affiliation

Design and development of efficient, economical, and durable electrocatalysts for oxygen evolution reaction (OER) are of key importance for the realization of electrocatalytic water splitting. To date, VB₂ and its derivatives have not been considered as electrocatalysts for water oxidation. Herein, we developed a series of electrocatalysts with a formal composition of V_1–xCo_xB₂ (x = 0, 0.05, 0.1, and 0.2) and employed them in an oxygen-evolving reaction. The incorporation of Co into the VB₂ structure caused a dramatic transformation in the morphology, resulting in a super low overpotential of 200 mV at 10 mA cm^–2 for V_0.9Co_0.1B₂ and displaying much greater performance compared to the noble-metal catalyst RuO₂ (290 mV). The longevity of the best-performing sample was assessed through the exposure to the current density of 10 mA cm^–2, showing relative durability after 12 h under 1 M KOH conditions. The Faradaic efficiency tests corroborated the initiation of OER at 1.45 V (vs RHE) and suggested a potential region of 1.50–1.55 V (vs RHE) as the practical OER region. The facile electron transfer between metal(s)–metalloid, high specific surface area, and availability of active oxy-hydroxy species on the surface were identified as the major contributors to this superior OER performance.

中文翻译：

通过钴替代物来定制具有成本效益的二硼化钒的形态，用于高效碱性水氧化

设计和开发高效、经济、耐用的析氧反应（OER）电催化剂对于实现电催化水分解至关重要。迄今为止，VB ₂及其衍生物尚未被认为是水氧化的电催化剂。在此，我们开发了一系列正式组成为 V _{1– x} Co _x B ₂ ( x = 0、0.05、0.1 和 0.2)的电催化剂，并将它们用于析氧反应。将 Co 掺入 VB ₂结构导致形态发生显着转变，导致V _0.9在 10 mA cm ^{–2 下}具有 200 mV 的超低过电位Co _0.1 B ₂并且与贵金属催化剂RuO ₂ (290 mV)相比表现出更高的性能。通过暴露于 10 mA cm ^–2的电流密度来评估性能最佳的样品的寿命，显示在 1 M KOH 条件下 12 小时后的相对耐久性。法拉第效率测试证实了在 1.45 V（相对于 RHE）时开始 OER，并建议将 1.50-1.55 V（相对于 RHE）的潜在区域作为实际的 OER 区域。金属-类金属之间的电子转移容易、高比表面积和表面活性氧羟基物种的可用性被确定为这种优异 OER 性能的主要贡献者。

更新日期：2021-12-20

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