College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu, 610065, P. R. China.
Department of Materials Science and Engineering, State Key Laboratory of Marine Pollution, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, 999077, P. R. China.
Small. 2023 Jul;19(27):e2208261. doi: 10.1002/smll.202208261. Epub 2023 Apr 3.
The lack of high efficiency and pH-universal bifunctional electrocatalysts for water splitting to hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) hinders the large-scale production of green hydrogen. Here, an IrPd electrocatalyst supported on ketjenblack that exhibits outstanding bifunctional performance for both HER and OER at wide pH conditions is presented. The optimized IrPd catalyst exhibits a specific activity of 4.46 and 3.98 A mg in the overpotential of 100 and 370 mV for HER and OER, respectively, in alkaline conditions. When applied to the anion exchange membrane electrolyzer, the Ir Pd /KB catalyst shows a stability of >20 h at a current of 250 mA cm for water decomposition, indicating promising prospects for practical applications. Beyond offering an advanced electrocatalyst, this work also guides the rational design of desirable bifunctional electrocatalysts for HER and OER by regulating the microenvironments and electronic structures of metal catalytic sites for diverse catalysis.
缺乏高效且适用于宽 pH 值范围的水分解析氢反应 (HER) 和析氧反应 (OER) 的双功能电催化剂，阻碍了绿色氢气的大规模生产。本文报道了一种负载在 Ketjenblack 上的 IrPd 电催化剂，该催化剂在宽 pH 值条件下对 HER 和 OER 均表现出优异的双功能性能。优化后的 IrPd 催化剂在碱性条件下 HER 和 OER 的过电势为 100 和 370 mV 时的比活性分别为 4.46 和 3.98 A mg。应用于阴离子交换膜电解槽时，IrPd / KB 催化剂在电流为 250 mA cm 的条件下进行水分解的稳定性>20 h，表明其在实际应用中具有广阔的前景。本工作除了提供先进的电催化剂外，还通过调节金属催化位点的微环境和电子结构来指导理想的 HER 和 OER 双功能电催化剂的合理设计，以实现多种催化反应。
