Ir-based synergistic interaction with transition metal alloys for catalytic overall water splitting holds great promise for application. However, the role of the transition metal in the alloy for the catalytic reaction is not well understood. Here, we report new IrNi porous miscible alloy nanoparticles (IrNi PMAN) for overall water splitting in 1 M KOH. IrNi PMAN exhibits excellent bifunctional electrocatalytic activity with overpotentials of only 14 mV and 245 mV for HER and OER at 10 mA cm -2, respectively. What's more, it only requires 43 mV and 324 mV for HER and OER at high current densities of 100 mA cm -2, respectively. In addition, IrNi PMAN as two-electrode electrolyzer produces a current density of 100 mA cm -2 at 1.69 V. The synergistic effect of the alloys is the main factor for the high catalytic efficiency. Notably, DFT calculations indicate that Ni adsorbs OH- more rapidly and accelerates Ir adsorption and conversion of OER intermediates, thus improving the stability and activity of overall water splitting.(c) 2022 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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机译：基于Ir的与过渡金属合金的协同作用在催化整体水分解中具有广阔的应用前景。然而，过渡金属在合金中对催化反应的作用尚不清楚。在这里，我们报道了新的IrNi多孔混溶合金纳米颗粒（IrNi PMAN），用于在1 M KOH中进行整体水分解。IrNi PMAN 表现出优异的双功能电催化活性，在 10 mA cm -2 时，HER 和 OER 的过电位分别仅为 14 mV 和 245 mV。此外，在100 mA cm -2的高电流密度下，HER 和 OER 分别只需要 43 mV 和 324 mV。此外，IrNi PMAN作为双电极电解槽，在1.69 V电压下产生100 mA cm -2的电流密度。合金的协同作用是催化效率高的主要因素。值得注意的是，DFT计算表明，Ni吸附OH-的速度更快，加速了OER中间体的Ir吸附和转化，从而提高了整体水分解的稳定性和活性。（c） 2022 Hydrogen Energy Publications LLC. 由 Elsevier Ltd. 出版。保留所有权利。
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