Xiangqun Zeng, Hang Cong, Nan Jiang, Qiang Wang, Jiao-Jing Shao, Jie Zhao* and Dongjing Liu*,
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引用次数: 0
摘要
开发低成本、高效率的OER电催化剂是实现电化学水分解制氢的关键。在本研究中,采用溶剂热法将ZIF-67衍生的硫化钴空心纳米球固定在马铃薯淀粉衍生的碳气凝胶(Co-S@CA)上,然后进行退火。Co-S与三维碳气凝胶(CA)的协同作用使复合材料的电荷转移速度快,电化学表面积大,电子结构好,增强了复合材料的电化学活性。合成的Co-S@CA催化剂表现出优异的催化性能,在10 mA cm-2下过电位为291 mV, Tafel斜率为61.8 mV dec1,优于工业RuO2催化剂。Co-S@CA催化剂表现出优异的稳定性,经过60小时的稳定性测试,过电位的增加可以忽略不计。密度泛函理论(DFT)计算进一步支持了实验结果,表明Co-S和碳之间的界面电荷转移产生了一个内置电场,并使d带中心上移,增强了电荷转移能力,降低了OER的理论过电位。这些改进显著提高了催化活性。这项研究强调了Co-S@CA复合材料作为可再生能源应用的高效电催化剂的潜力。
Construction of ZIF-67-Derived Cobalt Sulfide@Carbon Aerogel toward Interface-Enhanced Electrochemical Activities for the Oxygen Evolution Reaction
Developing low-cost and high-efficiency OER electrocatalysts holds the key to hydrogen production from electrochemical water splitting. In this study, cobalt sulfide hollow nanospheres derived from ZIF-67 were immobilized on a potato starch-derived carbon aerogel (Co–S@CA) using a solvothermal method followed by annealing. The synergistic effects of Co–S and three-dimensional carbon aerogel (CA) facilitate rapid charge transfer, high electrochemical surface area, and better electronic structure, enhancing the electrochemical activity of the composite. The synthesized Co–S@CA catalyst exhibited remarkable catalytic performance with an overpotential of 291 mV at 10 mA cm–2 and a Tafel slope of 61.8 mV dec–1, outperforming the commercial RuO2 catalyst. The Co–S@CA catalyst demonstrates excellent stability with negligible increase in overpotential after 60 h of a stability test. Density functional theory (DFT) calculations further supported the experimental results, showing that the interfacial charge transfer between Co–S and carbon generates a built-in electric field and upshifts the d-band center, enhancing charge-transfer capability and lowering the theoretical overpotential for the OER. These improvements significantly boost the catalytic activity. This study highlights the potential of Co–S@CA composites as highly efficient electrocatalysts for renewable energy applications.
期刊介绍:
Langmuir is an interdisciplinary journal publishing articles in the following subject categories:
Colloids: surfactants and self-assembly, dispersions, emulsions, foams
Interfaces: adsorption, reactions, films, forces
Biological Interfaces: biocolloids, biomolecular and biomimetic materials
Materials: nano- and mesostructured materials, polymers, gels, liquid crystals
Electrochemistry: interfacial charge transfer, charge transport, electrocatalysis, electrokinetic phenomena, bioelectrochemistry
Devices and Applications: sensors, fluidics, patterning, catalysis, photonic crystals
However, when high-impact, original work is submitted that does not fit within the above categories, decisions to accept or decline such papers will be based on one criteria: What Would Irving Do?
Langmuir ranks #2 in citations out of 136 journals in the category of Physical Chemistry with 113,157 total citations. The journal received an Impact Factor of 4.384*.
This journal is also indexed in the categories of Materials Science (ranked #1) and Multidisciplinary Chemistry (ranked #5).