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A New Defect‐Rich CoGa Layered Double Hydroxide as Efficient and Stable Oxygen Evolution Electrocatalyst
Small Methods ( IF 10.7 ) Pub Date : 2018-09-27 , DOI: 10.1002/smtd.201800286 Jie Zhang 1 , Chaoqun Dong 1 , Zhenbin Wang 1 , Hui Gao 1 , Jiazheng Niu 1 , Zhangquan Peng 2 , Zhonghua Zhang 1
Small Methods ( IF 10.7 ) Pub Date : 2018-09-27 , DOI: 10.1002/smtd.201800286 Jie Zhang 1 , Chaoqun Dong 1 , Zhenbin Wang 1 , Hui Gao 1 , Jiazheng Niu 1 , Zhangquan Peng 2 , Zhonghua Zhang 1
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Developing highly efficient and earth‐abundant electrocatalysts is urgent for oxygen evolution reaction (OER), and layered double hydroxides (LDHs) show great potentials as advanced electrocatalysts toward OER. However, the catalytic activity of LDHs is normally limited by their poor electronic conductivity and low electrochemical active areas. Herein, a novel sputtering–painting–alloying–dealloying strategy is reported to synthesize CoGa LDH anchored on stainless steel mesh (CoGa LDH/stainless steel mesh, SSM), in which abundant oxygen vacancies are introduced into the ultrathin CoGa LDH nanosheets. Owing to the unique painting‐like operation, the nanosheet‐decorated CoGa LDH/SSM electrode can be fabricated on a large scale (8 × 8 cm2 for instance), and possesses excellent flexibility and self‐supported feature. Free of any conducting/binder agents, the CoGa LDH/SSM electrode shows excellent electrocatalytic activity toward OER in an alkaline solution (low overpotential of 258 mV @ 10 mA cm−2, small Tafel slope of 34.1 mV dec−1, long‐term stability of 70 h), which is superior to that of state‐of‐the‐art Co‐based electrocatalysts. More importantly, the electrode needs only an overpotential of 198 mV to reach 10 mA cm−2 at 335 K. The OER performance of CoGa LDH/SSM can be rationalized by numerous oxygen vacancies, ultrathin nanosheet morphology, self‐supported nature, and low activation energy barrier.
中文翻译：
一种新型的富含缺陷的CoGa层状双氢氧化物作为高效稳定的析氧电催化剂
氧气释放反应（OER）迫切需要开发高效且富含地球的电催化剂，而层状双氢氧化物（LDHs）作为面向OER的高级电催化剂具有巨大的潜力。但是，LDHs的催化活性通常受到其较差的电子电导率和较低的电化学活性面积的限制。在本文中，据报道，一种新颖的溅射-喷涂-合金化-脱合金策略可合成锚固在不锈钢网（CoGa LDH /不锈钢网，SSM）上的CoGa LDH，其中超薄CoGa LDH纳米片中引入了大量的氧空位。由于独特的涂漆操作，纳米片装饰的CoGa LDH / SSM电极可大规模制造（8×8 cm 2例如），并具有出色的灵活性和自我支持的功能。CoGa LDH / SSM电极不含任何导电/粘合剂，在碱性溶液中对OER表现出出色的电催化活性（低过电势258 mV @ 10 mA cm -2，小Tafel斜率34.1 mV dec -1，长期稳定性为70 h），优于最新的钴基电催化剂。更重要的是，电极只需要一个过电压198毫伏达到10毫安厘米-2在COGA LDH的335 K的OER性能/ SSM可以通过众多的氧空位进行合理化，超薄纳米片的形态，自支撑性质和低活化能垒。
更新日期：2018-09-27
中文翻译：
一种新型的富含缺陷的CoGa层状双氢氧化物作为高效稳定的析氧电催化剂
氧气释放反应（OER）迫切需要开发高效且富含地球的电催化剂，而层状双氢氧化物（LDHs）作为面向OER的高级电催化剂具有巨大的潜力。但是，LDHs的催化活性通常受到其较差的电子电导率和较低的电化学活性面积的限制。在本文中，据报道，一种新颖的溅射-喷涂-合金化-脱合金策略可合成锚固在不锈钢网（CoGa LDH /不锈钢网，SSM）上的CoGa LDH，其中超薄CoGa LDH纳米片中引入了大量的氧空位。由于独特的涂漆操作，纳米片装饰的CoGa LDH / SSM电极可大规模制造（8×8 cm 2例如），并具有出色的灵活性和自我支持的功能。CoGa LDH / SSM电极不含任何导电/粘合剂，在碱性溶液中对OER表现出出色的电催化活性（低过电势258 mV @ 10 mA cm -2，小Tafel斜率34.1 mV dec -1，长期稳定性为70 h），优于最新的钴基电催化剂。更重要的是，电极只需要一个过电压198毫伏达到10毫安厘米-2在COGA LDH的335 K的OER性能/ SSM可以通过众多的氧空位进行合理化，超薄纳米片的形态，自支撑性质和低活化能垒。
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