MoP-Mo2C quantum dot heterostructures uniformly hosted on a heteroatom-doped 3D porous carbon sheet network as an efficient bifunctional electrocatalyst for overall water splitting
MoP-Mo2C quantum dot heterostructures uniformly hosted on a heteroatom-doped 3D porous carbon sheet network as an efficient bifunctional electrocatalyst for overall water splitting
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DOI：
10.1016/j.cej.2021.133719
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发表时间：
2022-01-06
影响因子：
15.1
通讯作者：
Shen, Pei Kang
中科院分区：
文献类型：
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作者：
Jiang, Enjun;Li, Junqing;Shen, Pei Kang
在这项工作中，我们构建了MoP-Mo 2C量子点异质结构均匀托管在一个三维（3D）分级多孔薄N，P掺杂碳片网络（MoP-Mo 2C/NPC）的一种新的一锅同时磷化-碳化-活化的铼螯合树脂和KOH。螯合限制不仅可以防止MoP/Mo 2C量子点的聚集，而且可以同步产生N和P掺杂的碳片网络，而不需要后原子掺杂。所制备的MoP-Mo 2C/NPC具有大的比表面积、高的电子电导率和丰富的析氢、析氧活性位。结果表明，具有较低的H吸附Gibbs自由能的MoP-Mo 2C/NPC在碱性介质中对HER和OER过程均表现出良好的电催化活性和电稳定性。此外，组装的MoP-Mo 2C/NPC|| MoP-Mo 2C/NPC碱性电解槽在1.55 V的过电位下电流密度为10 mA cm-2，168 h（1周）后电流密度保持在初始值的95%以上，上级现有的Pt/C碱性电解槽||RuO 2/C体系在整个水裂解过程中的作用。
In this work, we constructed MoP-Mo2C quantum dot heterostructures uniformly hosted on a three-dimensional (3D) hierarchically porous thin N,P-doped carbon sheet network (MoP-Mo2C/NPC) by a novel one-pot simultaneous phosphating-carbonization-activation of molybdenum-chelated resin and KOH. Chelate confinement not only prevents the aggregation of MoP/Mo2C quantum dots, but also synchronously produces a carbon sheet network doped with N and P without the requirement for post-atom doping. The prepared MoP-Mo2C/NPC exhibited a large specific surface area, a high electron conductivity, and abundant active sites for the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER). As a result, MoP-Mo2C/NPC with a low calculated Gibbs free energy for H adsorption exhibited an excellent electrocatalytic activity and an ultrahigh stability for both the HER and OER processes in an alkaline medium. In addition, the assembled MoP-Mo2C/NPC || MoP-Mo2C/NPC alkaline electrolyzer delivered a current density of 10 mA cm-2 at an overpotential of only 1.55 V, and maintained > 95% of the initial current density after 168 h (1 week) of activity, which is superior to that of the state-of-the-art Pt/C || RuO2/C system in the overall water splitting process.