Ionothermal Route to Phase-Pure RuB2 Catalysts for Efficient Oxygen Evolution and Water Splitting in Acidic Media,ACS Energy Letters

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Ionothermal Route to Phase-Pure RuB2 Catalysts for Efficient Oxygen Evolution and Water Splitting in Acidic Media
ACS Energy Letters ( IF 19.3 ) Pub Date : 2020-08-13 , DOI: 10.1021/acsenergylett.0c01384
Ding Chen _{1,

2} , Tingting Liu ₃ , Pengyan Wang ₁ , Jiahuan Zhao ₁ , Chengtian Zhang ₁ , Ruilin Cheng ₁ , Wenqiang Li ₁ , Pengxia Ji ₁ , Zonghua Pu ₁ , Shichun Mu _{1,

2}

Affiliation

Developing high-efficiency and stable oxygen evolution reaction (OER) materials remains a great challenge, especially in an acidic medium. In this study, we report the first synthesis of phase-pure RuB₂ by using a salt melt of potassium chloride and lithium chloride as the solvent. When used as an electrocatalyst in 0.5 M sulfuric acid, the as-prepared RuB₂ needs an overpotential of only 223 mV for the OER to produce an operationally relevant current density of 10 mA cm^–2. This is almost the smallest overpotential value for Ir/Ru-based acidic OER catalysts reported to date. More importantly, in the acidic full water splitting, RuB₂ exhibits outstanding activity and stability, which merely needs a cell voltage of 1.525 V to reach a current density of 10 mA cm^–2, lower than those of the most bifunctional electrocatalysts reported in acid electrolytes. Theoretical calculation results further identify the formation of *OOH as the rate-determining step and the lower energy barrier for the RuB₂ catalyst, improving the OER activity. This work represents a significant addition to exploring a new class of transition metal borides with outstanding activity in acidic water electrolysis and beyond.

中文翻译：

离子热途径制备纯相RuB ₂催化剂，可在酸性介质中有效地释放氧气和分解水

开发高效且稳定的放氧反应（OER）材料仍然是一个巨大的挑战，尤其是在酸性介质中。在这项研究中，我们报告了使用氯化钾和氯化锂的盐熔体作为溶剂首次合成纯相RuB ₂的方法。当在0.5 M硫酸中用作电催化剂时，所制备的RuB ₂对于OER仅需要223 mV的超电势即可产生10 mA cm ^–2的相关工作电流密度。迄今为止，这几乎是基于Ir / Ru的酸性OER催化剂的最小超电势值。更重要的是，在酸性全水裂解中，RuB ₂具有出色的活性和稳定性，仅需1.525 V的电池电压即可达到10 mA cm ^–2的电流密度，低于酸性电解质中报道的大多数双功能电催化剂的电流密度。理论计算结果进一步确定* OOH的形成是速率确定步骤和RuB ₂催化剂的较低能垒，从而提高了OER活性。这项工作为探索在酸性水电解及其他方面具有出色活性的新型过渡金属硼化物提供了重要的补充。

更新日期：2020-09-11

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