Rational construction of N-containing carbon sheets atomically doped NiP-CoP nanohybrid electrocatalysts for enhanced green hydrogen and oxygen production

IF 5.5 3区材料科学 Q1 ELECTROCHEMISTRY Electrochimica Acta Pub Date : 2024-10-18 DOI:10.1016/j.electacta.2024.145236

Adewale K. Ipadeola, Mostafa H. Sliem, Patrick Mwonga, Kenneth I. Ozoemena, Aboubakr M. Abdullah

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Abstract

The pursuit of sustainable energy production has directed rigorous research in the field of electrocatalysis, particularly for water electrolysis (i.e., hydrogen (HER) and oxygen evolution reactions (OER)). This study discloses the rational synthesis of N-containing carbon sheets atomically doped NiP-CoP nanohybrid (NiP-CoP/NCS) via precipitation/calcination. The fabrication method tailored the physicochemical merits for collective contribution to improved green hydrogen and oxygen, elucidated by surface/bulk characterization and theoretical calculations. Thus, the NiP-CoP/NCS had improved HER activity at lower overpotential (ƞ₁₀ = 197.7/274.6 mV), higher exchange current density (j_o = 0.71/0.67 mA/cm²), turnover frequency (TOF = 2.63/1.47 s^-1), H₂ production rate (3601.63/2519.12 µmol/g/h) and superior stability after 24 h in acid/alkaline media, than NiP/NCS and CoP/NCS. Moreover, NiP-CoP/NCS delivered impressive OER activity at reduced ƞ₁₀ (309.1 mV), and Tafel slope (b_a = 58.9 ± 3.0 mV/dec), but higher TOF (3.67 s^-1) and O₂ production rate (3643.96 µmol/g/h) relative to NiP/NCS and CoP/NCS, besides higher stability for 24 h. These were further proved by theoretical calculations. This work indicates a deeper understanding of the fabrication methods of making efficient electrocatalysts for green and sustainable energy conversion.

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合理构建含氮碳片原子掺杂 NiP-CoP 纳米杂化电催化剂，提高绿色制氢制氧能力

对可持续能源生产的追求引导了电催化领域的深入研究，尤其是水电解（即氢（HER）和氧进化反应（OER））。本研究揭示了通过沉淀/煅烧合理合成含氮碳片原子掺杂 NiP-CoP 纳米杂化物（NiP-CoP/NCS）的方法。通过表面/块体表征和理论计算，阐明了该制备方法对改善绿色氢气和氧气的集体贡献的物理化学优点。因此，与 NiP/NCS 和 CoP/NCS 相比，NiP-CoP/NCS 在较低的过电位（ƞ10 = 197.7/274.6 mV）、较高的交换电流密度（jo = 0.71/0.67 mA/cm2）、翻转频率（TOF = 2.63/1.47 s-1）、H2 产率（3601.63/2519.12 µmol/g/h）和在酸碱介质中 24 小时后的稳定性方面均有改善。此外，与 NiP/NCS 和 CoP/NCS 相比，NiP-CoP/NCS 在降低ƞ10（309.1 mV）和 Tafel 斜坡（ba = 58.9 ± 3.0 mV/dec）时具有令人印象深刻的 OER 活性，但 TOF（3.67 s-1）和 O2 生成率（3643.96 µmol/g/h）更高，而且 24 小时稳定性更高。这项工作表明，人们对用于绿色和可持续能源转换的高效电催化剂的制造方法有了更深入的了解。

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来源期刊

Electrochimica Acta 工程技术-电化学

CiteScore

11.30

自引率

6.10%

发文量

1634

审稿时长

41 days

期刊介绍： Electrochimica Acta is an international journal. It is intended for the publication of both original work and reviews in the field of electrochemistry. Electrochemistry should be interpreted to mean any of the research fields covered by the Divisions of the International Society of Electrochemistry listed below, as well as emerging scientific domains covered by ISE New Topics Committee.