Abstract

Self-supported non-noble metal based bifunctional electrocatalysts with high catalytic activity and long-term stability in a wide pH range are highly essential for the production of hydrogen and oxygen, remains a great challenge. Herein, a bifunctional electrocatalyst is synthesized via electroless plating of FeCoNiP nanoparticles on self-supported phosphorus-doped vertically aligned graphene arrays (FeCoNiP/P-VG). FeCoNiP/P-VG exhibits an exceptionally high catalytic activity for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in a wide pH range, with an overpotential of 81 and 141 mV for HER, and 240 and 409 mV for OER, in 1.0 M KOH and 0.5 M H₂SO₄ respectively, at current density of 10 mA. It also performs quite low Tafel slope value of 40 mV·dec⁻¹ for HER and 69 mV·dec⁻¹ for OER in 1.0 M KOH. More importantly, it shows prominent stability in acidic and alkaline electrolytes. This study may open a new avenue for the design and fabrication of self-supported bifunctional electrocatalysts for water splitting.

Graphic Abstract

中文翻译：

---

自支撑磷掺杂垂直排列的石墨烯阵列与FeCoNiP纳米粒子集成作为双功能电催化剂，可在较宽的pH范围内进行水分解

摘要

在宽pH范围内具有高催化活性和长期稳定性的自支撑非贵金属基双功能电催化剂对于生产氢气和氧气至关重要，仍然是一个巨大的挑战。在此，通过在自支撑的磷掺杂垂直排列的石墨烯阵列（FeCoNiP / P-VG）上化学镀FeCoNiP纳米颗粒来合成双功能电催化剂。FeCoNiP / P-VG在很宽的pH范围内对氢释放反应（HER）和氧释放反应（OER）表现出极高的催化活性，HER的过电势分别为81和141 mV，OER的过电势为240和409 mV，分别在1.0 M KOH和0.5 MH ₂ SO _4中，电流密度为10 mA。它还执行了非常低的Tafel斜率值40 mV·dec^-1用于HER和69毫伏·癸^-1为OER中的1.0M KOH。更重要的是，它在酸性和碱性电解质中显示出显着的稳定性。这项研究可能会为水分解用自支撑双功能电催化剂的设计和制造开辟一条新途径。

图形摘要