Jing Cao , Dezheng Zhang , Bianqing Ren , Ping Song , Weilin Xu
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引用次数: 0
摘要
开发高效稳定的双功能整体水分离技术是清洁和可再生能源的重要目标，也是一项具有挑战性的任务。在此，我们报告了一种锰掺杂 RuO2（Mn-RuO2）催化剂，用于在酸性和碱性介质中高效电催化氧进化反应（OER）和氢进化反应（HER）。由于掺入了 Mn，电化学活性面积更大，Mn-RuO2 在酸性介质中进行 OER 反应时需要 200 mV 的过电位才能达到 10 mA/cm2 的电流密度。DFT 结果表明，在 RuO2 中掺入锰可以提高 OER 活性。由双功能 Mn-RuO2 构建的具有良好稳定性的酸性整体水分离电解槽只需要 1.50 V 的电池电压就能达到 10 mA/cm2 的电流密度，并能在 50 mA/cm2 的电流密度下稳定运行 50 h，优于最先进的 Ru 基催化剂。此外，Mn-RuO2 在碱性介质中表现出优异的 HER 和 OER 活性，在整个水分离过程中表现出卓越的活性和耐久性，只需 1.49 V 的电池电压即可达到 10 mA/cm2。本研究为设计和构建用于整体水分离的高效 Ru 基电催化剂提供了一种有效的方法。
Mn incorporated RuO2 nanocrystals as an efficient and stable bifunctional electrocatalyst for oxygen evolution reaction and hydrogen evolution reaction in acid and alkaline
The development of efficient and stable bifunctional overall water-splitting is a crucial goal for clean and renewable energy, which is a challenging task. Herein, we report an Mn-incorporated RuO2 (Mn-RuO2) catalyst for highly efficient electrocatalytic oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) in acid and alkaline media. Benefiting from a more electrochemical active area with the incorporation of Mn, the Mn-RuO2 required an overpotential of 200 mV to attain a current density of 10 mA/cm2 for OER in acid. DFT result indicates that the doping of Mn into RuO2 can enhance the OER activity. An acidic overall water-splitting electrolyzer with good stability constructed by bifunctional Mn-RuO2 only requires a cell voltage of 1.50 V to afford 10 mA/cm2 and can operate stably for 50 h at 50 mA/cm2, which is better than the state-of-the-art Ru-based catalyst. Additionally, the Mn-RuO2 exhibits excellent HER and OER activity in alkaline media, and it shows superior activity and durability for overall water-splitting, only needing a cell voltage of 1.49 V to attain 10 mA/cm2. The present work provides an efficient approach to designing and constructing efficient Ru-based electrocatalysts for overall water-splitting.
期刊介绍：
Chinese Chemical Letters (CCL) (ISSN 1001-8417) was founded in July 1990. The journal publishes preliminary accounts in the whole field of chemistry, including inorganic chemistry, organic chemistry, analytical chemistry, physical chemistry, polymer chemistry, applied chemistry, etc.Chinese Chemical Letters does not accept articles previously published or scheduled to be published. To verify originality, your article may be checked by the originality detection service CrossCheck.
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