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Stepwise chemical oxidation to access ultrathin metal (oxy)-hydroxide nanosheets for the oxygen evolution reaction
Nanoscale ( IF 5.8 ) Pub Date : 2021-08-20 , DOI: 10.1039/d1nr03813c Jiangquan Lv 1, 2 , Xiangfeng Guan 1, 2 , Yiyin Huang 3 , Lanxin Cai 1 , Muxin Yu 1 , Xiaoyan Li 1 , Yunlong Yu 1 , Dagui Chen 1
Nanoscale ( IF 5.8 ) Pub Date : 2021-08-20 , DOI: 10.1039/d1nr03813c Jiangquan Lv 1, 2 , Xiangfeng Guan 1, 2 , Yiyin Huang 3 , Lanxin Cai 1 , Muxin Yu 1 , Xiaoyan Li 1 , Yunlong Yu 1 , Dagui Chen 1
Affiliation
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Incorporation of ultrathin nanosheets with dopants/defects shows great potential to enable metal (oxy)-hydroxide electrocatalysts with enhanced oxygen evolution reaction (OER) performance via the regulation of atomic structure and bonding arrangements. However, it remains challenging in synthesis especially for such dual control and at large scale. In this study, we present a stepwise chemical oxidation route, involving phase transition and reconstruction processes, to access ultrathin CoOOH nanosheets with a thickness of ca. 4 nm and abundant oxygen vacancies. Other transition metals were also doped into CoOOH nanosheets through this strategy. Among them, the optimized FeCoOOH nanosheets demonstrated an efficient OER activity with overpotential as low as 252 mV (current density: 10 mA cm−2) and excellent stability. A high and stable solar-to-hydrogen efficiency of 10.5% was acquired when FeCoOOH nanosheets were used as the anode in a constructed water splitting device driven by solar energy. This study offers a noble and facile strategy for potentially scalable preparation of atom-modulated ultrathin metal (oxy)-hydroxide nanosheets, and also demonstrates the OER applications.
中文翻译：
逐步化学氧化以获取用于析氧反应的超薄金属（氧）-氢氧化物纳米片
超薄纳米片与掺杂剂/缺陷的结合显示出巨大的潜力，通过调节原子结构和键合排列，使金属（氧）-氢氧化物电催化剂具有增强的析氧反应（OER）性能。然而，它在合成中仍然具有挑战性，特别是对于这种双重控制和大规模。在这项研究中，我们提出了一种逐步化学氧化路线，包括相变和重建过程，以获取厚度为约 10 的超薄 CoOOH 纳米片。4 nm 和丰富的氧空位。通过这种策略，其他过渡金属也被掺杂到 CoOOH 纳米片中。其中，优化的FeCoOOH纳米片表现出高效的OER活性，过电位低至252 mV（电流密度：10 mA cm -2）和优异的稳定性。当 FeCoOOH 纳米片用作太阳能驱动的构造水分解装置中的阳极时，获得了 10.5% 的高且稳定的太阳能制氢效率。该研究为原子调制超薄金属（氧）-氢氧化物纳米片的潜在可扩展制备提供了一种高贵而简便的策略，并展示了 OER 应用。
更新日期：2021-09-16
中文翻译：
逐步化学氧化以获取用于析氧反应的超薄金属（氧）-氢氧化物纳米片
超薄纳米片与掺杂剂/缺陷的结合显示出巨大的潜力，通过调节原子结构和键合排列，使金属（氧）-氢氧化物电催化剂具有增强的析氧反应（OER）性能。然而，它在合成中仍然具有挑战性，特别是对于这种双重控制和大规模。在这项研究中，我们提出了一种逐步化学氧化路线，包括相变和重建过程，以获取厚度为约 10 的超薄 CoOOH 纳米片。4 nm 和丰富的氧空位。通过这种策略，其他过渡金属也被掺杂到 CoOOH 纳米片中。其中，优化的FeCoOOH纳米片表现出高效的OER活性，过电位低至252 mV（电流密度：10 mA cm -2）和优异的稳定性。当 FeCoOOH 纳米片用作太阳能驱动的构造水分解装置中的阳极时，获得了 10.5% 的高且稳定的太阳能制氢效率。该研究为原子调制超薄金属（氧）-氢氧化物纳米片的潜在可扩展制备提供了一种高贵而简便的策略，并展示了 OER 应用。
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