通过简单合成调节 RuO2/TiO2 以增强酸性析氧反应,ACS Sustainable Chemistry & Engineering

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通过简单合成调节 RuO2/TiO2 以增强酸性析氧反应
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2023-06-12 , DOI: 10.1021/acssuschemeng.3c01881
Junxi Zhang ₁ , Rui Lin ₁ , Yichen Zhao ₁ , Hong Wang ₁ , Shengchu Liu ₁ , Xin Cai _{1,

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Affiliation

利用水分解装置特别是质子交换膜水电解装置（PEMWE）的绿色制氢受到了广泛关注。然而，析氧反应（OER）的缓慢动力学仍然阻碍其大规模商业应用。设计高性能和低成本的电催化剂来驱动 OER 反应仍然是一项艰巨的挑战。与金属氧化物载体结合的活性纳米颗粒被认为是提高酸性电解质中的耐久性和活性的有前途的策略。然而，没有支持预修饰的有效合成方法很少被研究。本文采用简单而有效的水热法并结合梯度退火温度来合成商业化的TiO ₂负载RuO ₂。代表性的 RuO ₂ /TiO _{2 -T250 需要 239 mV (@10 mA cm}^–2 )的低过电势、41.49 mV dec ^–1的塔菲尔斜率值和超过 20 小时的稳定性，远远超过商用 RuO ₂的性能。T250表现出结晶但水合的微观结构，现有的载体-金属氧化物相互作用重新分布了Ru和Ti周围的电子，这既提高了电催化剂的活性，又阻碍了Ru的溶解，从而提高了OER性能。该合成策略为设计用于 PEMWE 应用的更强大的电催化剂创建了一个重要平台。

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Modulation for RuO2/TiO2 via Simple Synthesis to Enhance the Acidic Oxygen Evolution Reaction

Green hydrogen production with water splitting devices, especially a proton exchange membrane water electrolyzer (PEMWE), has received extensive attention. However, the sluggish kinetics of the oxygen evolution reaction (OER) still hinders its large-scale commercial application. Designing high-performance and low-cost electrocatalysts to drive the OER reaction remains a tough challenge. The active nanoparticles incorporating with metal oxide support is considered a promising strategy to improve durability and activity in acidic electrolytes. However, efficient synthesis methods without support premodification are rarely investigated. Herein, a simple but effective hydrothermal method accompanying the gradient annealing temperature was used to synthesize commercial TiO₂ supported RuO₂. The representative RuO₂/TiO₂-T250 required a low overpotential of 239 mV (@10 mA cm^–2) with a Tafel slope value of 41.49 mV dec^–1 and stability of over 20 h, far exceeding the performance of commercial RuO₂. T250 exhibited a crystalline but hydrated microstructure, and the existing support-metal oxide interaction redistributed the electrons around Ru and Ti, which both gave rise to the activity of the electrocatalyst as well as hindered the Ru dissolution, thereby enhancing the OER performance. The synthesis strategy creates an important platform for designing more robust electrocatalysts for PEMWE application.

更新日期：2023-06-12

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