Abstract We presented a facile synthesis of porous hollow Au nanoshells (PHASs) with excellent catalytic properties by galvanic replacement and dealloying process. The addition amount of HAuCl4 during galvanic replacement played the important role in controlling structure, catalytic and optical properties of PHASs. The PHASs exhibited shorter induction time and highly catalytic rate constant towards reduction of p-nitrophenol by NaBH4. The catalytic rate constant of PHASs (17.2 × 10−3 s−1) was 25 times that of sacrificial Ag particles, 4.2 times that of Ag@Au with dense Au shell and 1.5 times that of Ag-Au alloys at same particle concentration. The normalized rate constant of PHASs (143 s-1 mmol−1) was 5.3 times that of Ag@Au and 1.6 times that of Ag-Au alloys. The as-synthesized PHASs with unique structures and tunable properties have fantastic potential applications in catalysis, biosensors, drug delivery and cancer therapy.

中文翻译：

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对还原对硝基苯酚具有增强催化性能的多孔空心金纳米壳的简便合成

摘要 我们提出了一种通过电流置换和脱合金工艺轻松合成具有优异催化性能的多孔空心金纳米壳 (PHAS)。电置换过程中HAuCl4的添加量在控制PHAS的结构、催化和光学性能方面起着重要作用。PHAS 对 NaBH4 还原对硝基苯酚表现出更短的诱导时间和高催化速率常数。PHAS 的催化速率常数（17.2 × 10-3 s-1）是牺牲银颗粒的 25 倍，是具有致密金壳的 Ag@Au 的 4.2 倍，是相同颗粒浓度下 Ag-Au 合金的 1.5 倍。PHAS 的归一化速率常数 (143 s-1 mmol-1) 是 Ag@Au 的 5.3 倍和 Ag-Au 合金的 1.6 倍。