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Morphological and Interfacial Engineering of Cobalt-Based Electrocatalysts by Carbon Dots for Enhanced Water Splitting
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2019-03-13 00:00:00 , DOI: 10.1021/acssuschemeng.8b06832 Tanglue Feng 1 , Qingsen Zeng 1 , Siyu Lu 2 , Mingxi Yang 1 , Songyuan Tao 1 , Yixin Chen 1 , Yue Zhao 1 , Bai Yang 1
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2019-03-13 00:00:00 , DOI: 10.1021/acssuschemeng.8b06832 Tanglue Feng 1 , Qingsen Zeng 1 , Siyu Lu 2 , Mingxi Yang 1 , Songyuan Tao 1 , Yixin Chen 1 , Yue Zhao 1 , Bai Yang 1
Affiliation
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Cobalt-based electrocatalysts for water splitting have attracted extensive research interests. However, the single function, poor performances, and restriction of electrolyte pH value have restricted their further development. Here, morphological and interfacial engineering of cobalt nanoparticles, are performed by the incorporation of carbon dots (CDs). Typically, the nitrogen-doped carbon-encapsulated cobalt nanoparticles (N–[email protected] NPs) were in situ constructed for electrocatalytic overall water splitting, exhibiting superior hydrogen evolution performances in both acid and alkaline media with the overpotential of 137 and 134 mV at 10 mA·cm–2, respectively, and excellent oxygen evolution performances in alkaline media with the overpotential of 353 mV at 10 mA·cm–2. Such performances outperform the majority of previously reported Co-based electrocatalysts and are comparable to many excellent nonprecious metal-based electrocatalysts. It is found that CDs have significant impact on fabricating a distinct morphology of catalysts and bonding structure between N–C and Co NPs, and synergistic effects between the N–C and Co NPs for water splitting are revealed. Furthermore, as a proof concept, the proposed strategy was further verified by CDs-decorated cobaltosic oxide nanoparticles ([email protected]3O4 NPs) with enhanced OER activities (a overpotential of 304 mV at 10 mA·cm–2). This work provides an approach for the synthesis of various stable metal-based carbon hybrids with high-performance photo/electrocatalystic activities.
中文翻译：
碳点增强水分解钴基电催化剂的形态学和界面工程
用于水分解的钴基电催化剂引起了广泛的研究兴趣。然而，单功能，性能差以及电解质pH值的限制限制了它们的进一步发展。在此，钴纳米颗粒的形态和界面工程是通过掺入碳点（CD）进行的。通常，原位构建氮掺杂的碳包裹的钴纳米颗粒（N– [受电子邮件保护的] NPs）用于电催化整体水分解，在酸性和碱性介质中均表现出优异的析氢性能，在137和134 mV下的过电势分别为10 mA·cm –2和在10 mA·cm –2时过电势为353 mV的碱性介质中优异的氧气释放性能。这种性能优于大多数先前报道的基于Co的电催化剂，并且可与许多出色的非贵金属基电催化剂相媲美。研究发现，CD对制造催化剂的独特形态以及N–C和Co NP之间的键结构具有重要影响，并且揭示了N–C和Co NP之间的水分解协同作用。此外，作为证明概念，该提议的策略进一步得到了带有CD修饰的氧化钴纳米颗粒（[电子邮件保护] 3 O 4 NPs）的验证，该纳米颗粒具有增强的OER活性（在10 mA·cm –2时超电势为304 mV））。这项工作提供了一种合成具有高性能光/电催化活性的各种稳定的基于金属的碳杂化物的方法。
更新日期：2019-03-13
中文翻译：
碳点增强水分解钴基电催化剂的形态学和界面工程
用于水分解的钴基电催化剂引起了广泛的研究兴趣。然而，单功能，性能差以及电解质pH值的限制限制了它们的进一步发展。在此，钴纳米颗粒的形态和界面工程是通过掺入碳点（CD）进行的。通常，原位构建氮掺杂的碳包裹的钴纳米颗粒（N– [受电子邮件保护的] NPs）用于电催化整体水分解，在酸性和碱性介质中均表现出优异的析氢性能，在137和134 mV下的过电势分别为10 mA·cm –2和在10 mA·cm –2时过电势为353 mV的碱性介质中优异的氧气释放性能。这种性能优于大多数先前报道的基于Co的电催化剂，并且可与许多出色的非贵金属基电催化剂相媲美。研究发现，CD对制造催化剂的独特形态以及N–C和Co NP之间的键结构具有重要影响，并且揭示了N–C和Co NP之间的水分解协同作用。此外，作为证明概念，该提议的策略进一步得到了带有CD修饰的氧化钴纳米颗粒（[电子邮件保护] 3 O 4 NPs）的验证，该纳米颗粒具有增强的OER活性（在10 mA·cm –2时超电势为304 mV））。这项工作提供了一种合成具有高性能光/电催化活性的各种稳定的基于金属的碳杂化物的方法。
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