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One-Pot Synthesis of Alloy Ir–Cu Microspheres with Excellent Electro-Catalytic Activity Toward Oxygen Evolution Reaction under Acidic Conditions
Energy & Fuels ( IF 5.2 ) Pub Date : 2020-06-28 , DOI: 10.1021/acs.energyfuels.0c01581 Luming Zhou 1 , Xuan Liu 1 , Kuankuan Wang 1 , Xihui Zhao 1 , Houkang Pu 1 , Te Zhang 1 , Jia Jia 1 , Kaiyu Dong 1 , Yujia Deng 1
Energy & Fuels ( IF 5.2 ) Pub Date : 2020-06-28 , DOI: 10.1021/acs.energyfuels.0c01581 Luming Zhou 1 , Xuan Liu 1 , Kuankuan Wang 1 , Xihui Zhao 1 , Houkang Pu 1 , Te Zhang 1 , Jia Jia 1 , Kaiyu Dong 1 , Yujia Deng 1
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The development of catalysts with high efficiency and stability in acidic electrolytes for oxygen evolution reaction (OER) is critical to water electrolyzers and renewable energy conversion and has been eagerly explored in the shape-controlled synthesis of noble metals such as Ir and Ru. However, the expensive prices of Ir and Ru severely hamper their wide use in OER. In this work, we show an efficient method for the one-pot synthesis of Ir0.4Cu0.6 microspheres. Electrochemical tests showed that the Ir–Cu microspheres as-synthesized delivered a prominent electrocatalytic activity toward OER in an acidic electrolyte with low overpotential (255 mV at 10 mA cm–2) and a small Tafel slope of 53.3 mV decade–1. They were much better than those of commercial Ir/C (331 mV at 10 mA cm–2 and Tafel slope of 100 mV decade–1). Moreover, the Ir0.4Cu0.6 as-synthesized also exhibited good stability for OER under acidic conditions, that is, after 30,000 s, the change of its potential was quite small in the chronopotentiometry test. The high catalytic performance could originate from the synergistic electronic interaction between iridium and copper atoms, which could modify the d-band center of iridium.
中文翻译：
一锅法合成具有优异电催化活性的Ir-Cu合金微球在酸性条件下对氧释放反应的合成
用于氧气析出反应（OER）的酸性电解质中高效，稳定的催化剂的开发对于水电解槽和可再生能源的转化至关重要，并且在诸如Ir和Ru之类的贵金属的形状控制合成中也进行了积极的探索。然而，铱和钌的昂贵价格严重阻碍了它们在OER中的广泛使用。在这项工作中，我们展示了一锅法合成Ir 0.4 Cu 0.6微球的有效方法。电化学测试表明，所合成的Ir-Cu微球在过低电位（10 mA cm –2时为255 mV ）和53.3 mV十倍–1的小Tafel斜率的酸性电解质中，对OER具有显着的电催化活性。。它们比商业Ir / C的要好得多（在10 mA cm –2时为331 mV，在100 mV十进位–1时的Tafel斜率）。此外，在酸性条件下，即30,000 s后，合成的Ir 0.4 Cu 0.6在OER上也表现出良好的稳定性，在计时电位法测试中其电势变化很小。较高的催化性能可能源于铱与铜原子之间的协同电子相互作用，这可以修饰铱的d带中心。
更新日期：2020-08-20
中文翻译：
一锅法合成具有优异电催化活性的Ir-Cu合金微球在酸性条件下对氧释放反应的合成
用于氧气析出反应（OER）的酸性电解质中高效，稳定的催化剂的开发对于水电解槽和可再生能源的转化至关重要，并且在诸如Ir和Ru之类的贵金属的形状控制合成中也进行了积极的探索。然而，铱和钌的昂贵价格严重阻碍了它们在OER中的广泛使用。在这项工作中，我们展示了一锅法合成Ir 0.4 Cu 0.6微球的有效方法。电化学测试表明，所合成的Ir-Cu微球在过低电位（10 mA cm –2时为255 mV ）和53.3 mV十倍–1的小Tafel斜率的酸性电解质中，对OER具有显着的电催化活性。。它们比商业Ir / C的要好得多（在10 mA cm –2时为331 mV，在100 mV十进位–1时的Tafel斜率）。此外，在酸性条件下，即30,000 s后，合成的Ir 0.4 Cu 0.6在OER上也表现出良好的稳定性，在计时电位法测试中其电势变化很小。较高的催化性能可能源于铱与铜原子之间的协同电子相互作用，这可以修饰铱的d带中心。
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