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Reactive template-engaged synthesis of Ni-doped Co3S4 hollow and porous nanospheres with optimal electronic modulation toward high-efficiency electrochemical oxygen evolution
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2022-06-14 , DOI: 10.1039/d2qi00896c
Bing Yang 1 , Chengjun Gu 2 , Qun Zhao 1 , Guangyao Zhou 3 , Lin Xu 2 , Huan Pang 4
Affiliation  

Exploring economical, high-efficiency and durable electrocatalysts for the oxygen evolution reaction (OER) is of critical importance for the advancement of sustainable energy conversion technologies, including water electrolysis and metal–air batteries. Compositional manipulation via heteroatom-doping and nanoarchitectural design of Earth-abundant electrocatalysts are extensively established as valid strategies to effectively optimize the electrocatalytic performance due to the electronic modulation and geometric effect. Herein, we demonstrate a self-sacrificial template strategy for the synthesis of Ni-doped Co3S4 (denoted as Ni-Co3S4 hereafter) hollow and porous nanospheres through a straightforward hydrothermal sulfuration treatment. The optimization of Ni incorporation into Co3S4 could dramatically regulate the electronic state, promote electrical conductivity, and enrich the catalytically active sites, thereby facilitating the OER performance. Furthermore, the hollow spherical nanostructures with permeable walls also allow the increase of the surface-area-to-volume ratio and the electrode–electrolyte contact area. Accordingly, the optimized Ni-Co3S4 hollow and porous nanospheres with an appropriate Ni content exhibit superior OER properties in 1.0 M KOH electrolyte, as reflected by an overpotential of 298 mV at 10 mA cm−2, a Tafel slope of 90.5 mV dec−1, and a long-term durability of 11 h, making them potential economical electrocatalysts for a myriad of OER-involved energy devices. It is believable that this proposed cation-doping strategy and self-templated synthesis strategy for hollow nanospheres would bring new inspirations for the future rational design of high-efficiency electrocatalysts from both aspects of electronic modulation and nanostructure engineering.

中文翻译:

Ni掺杂Co3S4中空和多孔纳米球的反应性模板参与合成具有最佳电子调制以实现高效电化学析氧

探索用于析氧反应 (OER) 的经济、高效和耐用的电催化剂对于发展可持续能源转换技术(包括水电解和金属-空气电池)至关重要。由于电子调制和几何效应,通过杂原子掺杂和纳米结构设计的地球丰富电催化剂的组成操纵被广泛确立为有效优化电催化性能的有效策略。在此,我们展示了一种用于合成 Ni 掺杂 Co 3 S 4的自牺牲模板策略(记为 Ni-Co 3 S 4此后)通过直接的水热硫化处理获得中空和多孔纳米球。Ni掺入Co 3 S 4的优化可以显着调节电子状态,提高导电性,丰富催化活性位点,从而促进OER性能。此外,具有可渗透壁的中空球形纳米结构还允许增加表面积与体积比和电极-电解质接触面积。因此,优化的 Ni-Co 3 S 4中空多孔纳米球在 1.0 M KOH 电解液中表现出优异的 OER 性能,在 10 mA cm -2时的过电位为 298 mV。、90.5 mV dec -1的 Tafel 斜率和 11 小时的长期耐久性,使它们成为无数涉及 OER 的能源装置的潜在经济电催化剂。相信本文提出的空心纳米球阳离子掺杂策略和自模板合成策略将从电子调制和纳米结构工程两个方面为未来高效电催化剂的合理设计带来新的启示。
更新日期:2022-06-14
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