Abstract Fabrication of efficient electrocatalysts for hydrogen evolution reaction (HER) is important to produce hydrogen fuel on a large scale via electrocatalytic water splitting. In this research, a novel electrocatalyst based on star-like molybdenum phosphide structure vertically grown on highly conductive graphene supported by a three-dimensional nickel foam (MoP/GR/NF) was synthesized via a facile hydrothermal method followed by a phosphidization strategy at 300 °C. The exclusive hierarchical nanostructure with abundant porosity was beneficial for enhancing active site numbers and electrical conductivity. In particular, the formation of Mo–P impressively changed electronic structure of the resulting material, thereby accelerating electrocatalytic activity for HER in 1.0 M KOH medium. The MoP/GR/NF required small overpotentials of 95 and 189 mV to deliver current densities of 10 and 50 mA cm−2, respectively. In addition, it also demonstrated a Tafel slope of 54 mV dec−1, which was significantly smaller than that of the GR/NF, Mo–O/GR/NF, and Mo–P/NF. Furthermore, there was negligible decrease of current response and overpotential for a continuous HER during long-term operation, implying its excellent stability. The prospective catalytic activity and good stability of the MoP/GR/NF material could prospectively open a new aspect for developing effective electrocatalyst for hydrogen production in water splitting application.

中文翻译：

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分层星状磷化钼纳米结构在 3D 泡沫上装饰石墨烯作为析氢反应的自支撑电催化剂

摘要 制备高效的析氢反应（HER）电催化剂对于通过电催化水分解大规模生产氢燃料具有重要意义。在这项研究中，通过简便的水热法合成了一种基于星状磷化钼结构的新型电催化剂，该结构垂直生长在由三维泡沫镍 (MoP/GR/NF) 支撑的高导电石墨烯上，然后在 300 ℃。具有丰富孔隙率的独特分层纳米结构有利于提高活性位点数量和电导率。特别是，Mo-P 的形成显着改变了所得材料的电子结构，从而加速了 HER 在 1.0 M KOH 介质中的电催化活性。MoP/GR/NF 需要 95 和 189 mV 的小过电位，以分别提供 10 和 50 mA cm-2 的电流密度。此外，它还表现出 54 mV dec-1 的 Tafel 斜率，明显小于 GR/NF、Mo-O/GR/NF 和 Mo-P/NF。此外，在长期运行期间，连续 HER 的电流响应和过电位的降低可以忽略不计，这意味着其出色的稳定性。MoP/GR/NF 材料的预期催化活性和良好的稳定性可以为开发有效的电催化剂用于水分解应用中的制氢开辟新的前景。和 Mo-P/NF。此外，在长期运行期间，连续 HER 的电流响应和过电位的降低可以忽略不计，这意味着其出色的稳定性。MoP/GR/NF 材料的预期催化活性和良好的稳定性可以为开发有效的电催化剂用于水分解应用中的制氢开辟新的前景。和 Mo-P/NF。此外，在长期运行期间，连续 HER 的电流响应和过电位的降低可以忽略不计，这意味着其出色的稳定性。MoP/GR/NF 材料的预期催化活性和良好的稳定性可以为开发有效的电催化剂用于水分解应用中的制氢开辟新的前景。