Efficient and Durable 3D Self-Supported Nitrogen-Doped Carbon-Coupled Nickel/Cobalt Phosphide Electrodes: Stoichiometric Ratio Regulated Phase- and Morphology-Dependent Overall Water Splitting Performance
Efficient and Durable 3D Self-Supported Nitrogen-Doped Carbon-Coupled Nickel/Cobalt Phosphide Electrodes: Stoichiometric Ratio Regulated Phase- and Morphology-Dependent Overall Water Splitting Performance
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高效耐用的 3D 自支撑氮掺杂碳耦合镍/钴磷化物电极：化学计量比调节的相位和形态相关的总体水分解性能
DOI：
10.1002/adfm.201906316
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发表时间：
2019-09-01
影响因子：
19
通讯作者：
Zhang, Jun
中科院分区：
文献类型：
--
作者：
Cao, Bo;Cheng, Yan;Zhang, Jun
报道了一种新型的三维自支撑集成NixCo 2-xP@NC（0 < x < 2）纳米阵列（NA）在泡沫镍（NF）电极上的构建，该阵列由高度分散的NixCo 2-xP纳米颗粒、纳米棒、纳米帽和纳米枝晶嵌入在NF上生长的N掺杂碳（NC）NA中。得益于特殊的形貌和结构设计以及电子结构工程的共同作用，NixCo 2-xP@NC NA/NF电极表现出上级的水裂解电催化性能，并在较宽的pH范围内具有优异的稳定性。结果表明，NiCoP@NC NA/NF电极在酸性溶液中具有最佳的析氢活性，在过电位为34 mV时，电流密度为10 mA cm-2。该电极在碱性介质中表现出优异的析氧和HER反应性能，在10 mA cm（-2）和50 mA cm（-2）时的过电位分别为37 mV和305 mV。最重要的是，当与NiCoP@NC NA/NF电极耦合用于整体水分解时，碱性电解槽在接近1.56 V的非常低的电池电压下提供20 mA cm（-2）的电流密度。NiCoP@NC NA/NF电极在j = 10 mA cm（-2）时具有出色的长期耐久性在酸性和碱性介质中22小时内电流密度的降低可以忽略不计。
The construction of a novel 3D self-supported integrated NixCo2-xP@NC (0 < x < 2) nanowall array (NA) on Ni foam (NF) electrode constituting highly dispersed NixCo2-xP nanoparticles, nanorods, nanocapsules, and nanodendrites embedded in N-doped carbon (NC) NA grown on NF is reported. Benefiting from the collective effects of special morphological and structural design and electronic structure engineering, the NixCo2-xP@NC NA/NF electrodes exhibit superior electrocatalytic performance for water splitting with an excellent stability in a wide pH range. The optimal NiCoP@NC NA/NF electrode exhibits the best hydrogen evolution reaction (HER) activity in acidic solution so far, attaining a current density of 10 mA cm(-2) at an overpotential of 34 mV. Moreover, the electrode manifests remarkable performances toward both HER and oxygen evolution reaction in alkaline medium with only small overpotentials of 37 mV at 10 mA cm(-2) and 305 mV at 50 mA cm(-2), respectively. Most importantly, when coupling with the NiCoP@NC NA/NF electrode for overall water splitting, an alkali electrolyzer delivers a current density of 20 mA cm(-2) at a very low cell voltage of approximate to 1.56 V. In addition, the NiCoP@NC NA/NF electrode has outstanding long-term durability at j = 10 mA cm(-2) with a negligible degradation in current density over 22 h in both acidic and alkaline media.