Wu Zongdeng, Liu Boyuan, Jing Haiyan, Gao Haiwen, He Bin, Xia Xifeng, Lei Wu, Hao Qingli
Key Laboratory for Soft Chemistry and Functional Materials, Ministry of Education, School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, Jiangsu, China.
Key Laboratory for Soft Chemistry and Functional Materials, Ministry of Education, School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, Jiangsu, China; Huzhou Key Laboratory of Environmental Functional Materials and Pollution Control, College of Engineering, Huzhou University, Huzhou 313000, China.
J Colloid Interface Sci. 2023 Jan;629(Pt A):22-32. doi: 10.1016/j.jcis.2022.08.102. Epub 2022 Aug 17.
Exploration of catalysts for water splitting is critical for advancing the development of energy conversion field, but designing bifunctional catalysts remains a major challenge. Herein, we demonstrate the N-doped carbon nanotube (NCNT)-grafted N-doped carbon (NC) framework embedding CoP nanoparticles (CoP@NC/NCNT) as hydrogen and oxygen evolution reaction (HER and OER) catalysts for water splitting. As a result, the CoP@NC/NCNT electrode requires the overpotentials of 106 and 177 mV at 10 mA cm in 0.5 M HSO and 1.0 M KOH solutions for HER, respectively. Moreover, an overpotential of 324 mV for OER can drive 10 mA cm in 1.0 KOH. The CoP@NC/NCNT-based electrolyzer derives a current density of 10 mA cm at a low voltage of 1.72 V in 1.0 M KOH and remains stable for 10 h. The outstanding electrocatalytic performance is mainly attributed to the hierarchical structure with rich branches and highly active component of CoP. The intimate contacts between hierarchical porous NC frameworks by cross-linked NCNTs create a 3D conductive network, which facilitates electron or mass transfer and activates CoP. This work offers a novel route for preparing hierarchical carbon framework encapsulated metal phosphide particles for potential applications in energy conversion field.
探索用于水分解的催化剂对于推动能量转换领域的发展至关重要，但设计双功能催化剂仍然是一项重大挑战。在此，我们展示了负载有钴磷纳米颗粒（CoP@NC/NCNT）的氮掺杂碳纳米管（NCNT）接枝氮掺杂碳（NC）框架作为用于水分解的析氢和析氧反应（HER和OER）催化剂。结果，CoP@NC/NCNT电极在0.5 M H₂SO₄和1.0 M KOH溶液中，对于HER在10 mA cm⁻²时分别需要106和177 mV的过电位。此外，对于OER在1.0 M KOH中324 mV的过电位可驱动10 mA cm⁻²。基于CoP@NC/NCNT的电解槽在1.0 M KOH中1.72 V的低电压下可获得10 mA cm⁻²的电流密度，并保持10小时稳定。出色的电催化性能主要归因于具有丰富分支的分级结构和CoP的高活性组分。通过交联NCNT形成的分级多孔NC框架之间的紧密接触创建了一个三维导电网络，这有利于电子或质量传递并激活CoP。这项工作为制备用于能量转换领域潜在应用的分级碳框架封装金属磷化物颗粒提供了一条新途径。
