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Equilibrated PtIr/IrOx Atomic Heterojunctions on Ultrafine 1D Nanowires Enable Superior Dual-Electrocatalysis for Overall Water Splitting
Small ( IF 13.0 ) Pub Date : 2022-04-14 , DOI: 10.1002/smll.202201333
Hongpu Huang 1 , Luhong Fu 1 , Weiqiang Kong 1 , Hairui Ma 1 , Xue Zhang 2 , Junlin Cai 1 , Shupeng Wang 1 , Zhaoxiong Xie 3 , Shuifen Xie 1
Affiliation  

Dual-active-sites atomically coupled on ultrafine 1D nanowires (NWs) can offer synergic atomic heterojunctions (AHJs) and high atomic-utilization toward multipurpose and superior catalysis. Here, ≈2-nm-thick PtIr/IrOx hybrid NWs are elaborately synthesized with equilibrated Pt/IrOx AHJs as high-efficiency bifunctional electrocatalysts for overall water splitting. Mechanism studies reveal the atomically coupled Pt–IrOx dual-sites are favorable for facilitating water dissociation, alleviating the binding of H* on Pt sites and inversely regulating the *OH adsorption and oxidation on bridge Ir–Ir sites. By simply equilibrating the Pt–IrOx ratio, the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) can be substantially accelerated. In particular, Pt-rich PtIr/IrOx-30 NWs attain 11-fold enhancements for HER compared to Pt/C in 1.0 m KOH, while IrOx-rich PtIr/IrOx-50 NWs express about five times mass activity referring to Ir/C for OER. Remarkably, the ratio-optimized PtIr/IrOx NWs electrode couple achieves a durably continuous H2 production under a substantially low cell voltage.

中文翻译:

超细一维纳米线上的平衡 PtIr/IrOx 原子异质结可实现卓越的双电催化整体水分解

超细一维纳米线 (NW) 上原子耦合的双活性位点可以提供协同原子异质结 (AHJ) 和高原子利用率,从而实现多用途和卓越的催化作用。在这里,≈2nm 厚的 PtIr/IrO x杂化 NW 与平衡的 Pt/IrO x AHJs 精心合成,作为用于整体水分解的高效双功能电催化剂。机理研究表明,原子耦合的 Pt-IrO x双位点有利于促进水的解离,减轻 H* 在 Pt 位点上的结合,并反向调节*OH 在桥式 Ir-Ir 位点上的吸附和氧化。通过简单地平衡 Pt-IrO x比,析氢反应(HER)和析氧反应(OER)可以大大加速。特别是,与 1.0 m KOH中的 Pt/C 相比,富含 Pt 的 PtIr/IrO x -30 NW 的 HER 增强了 11 倍,而富含 IrO x的 PtIr/IrO x -50 NW 的质量活性大约是 5 倍用于 OER 的 Ir/C。值得注意的是,比率优化的 PtIr/IrO x NWs 电极对在相当低的电池电压下实现了持久连续的 H 2生产。
更新日期:2022-04-14
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