Ag–NiP deposited green carbon channel embedded NiP panels for sustainable water splitting†

IF 3.2 Q2 CHEMISTRY, PHYSICAL
Energy advances Pub Date : 2024-09-12 DOI:10.1039/D4YA00463A
Revathy B. Nair, A. Anantha Krishnan, Aneesh Kumar M. A., Sivaraj Rajendran, Sreehari Harikumar, Vidhya C., M. Ameen Sha, Thomas Mathew, Sajith Kurian and P. S. Arun
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Abstract

Ag–NiP-deposited carbon channels on NiP panels were successfully developed through lemon juice extract (Ag–CL/NiP) and citric acid (Ag–CC/NiP)-assisted methodologies. The methods involved the precise execution of electroless deposition of the advanced Ag–carbon matrix with NiP. The lemon juice-assisted method produced carbon channels with a dense concentration of Ag–NiP on the electrode surface, whereas the citric acid method resulted in a less dense deposition of Ag–NiP on the electrode surface, as observed via FE-SEM. The Ag–CL/NiP has remarkably higher electro- and photocatalytic water splitting performance due to the compact and conductive Ag–NiP connected with carbon channels. Electrochemical impedance analysis of Ag–CL/NiP revealed a low Rct of 491.3 Ω at the open circuit potential, indicating enhanced conductivity. The electrocatalytic oxygen evolution reaction (OER) overpotential of Ag–CL/NiP was 401 mV to achieve a current density of 50 mA cm−2, with a Tafel slope of 46.5 mV dec−1. The panel exhibited good stability, with a proven durability of over 1000 cycles of CV during OER. The developed panel achieved an impressive photocurrent density of ∼9.5 mA cm−2 at 1.37 V vs. RHE when subjected to light irradiation with a wavelength exceeding 420 nm. Furthermore, the Ag–CL/NiP panel demonstrated the ability to generate 17.5 mmol cm−2 of H2 over a 4-hour sunlight irradiation period. The temperature-controlled photocatalytic water splitting experiment revealed that the panel maintained its activity at temperatures as low as ∼12 °C, but with a 40% drop in efficiency compared to normal sunlight conditions.

Abstract Image

用于可持续水分离的 Ag-NiP 沉积绿色碳通道嵌入式 NiP 面板
通过柠檬汁提取物(Ag-CL/NiP)和柠檬酸(Ag-CC/NiP)辅助方法,成功地在 NiP 面板上开发了 Ag-NiP 沉积碳通道。这两种方法都是将先进的银碳基质与 NiP 一起进行精确的无电解沉积。根据 FE-SEM 的观察,柠檬汁辅助法在电极表面生成了 Ag-NiP 浓度较高的碳通道,而柠檬酸法在电极表面沉积的 Ag-NiP 浓度较低。Ag-CL/NiP 的电化学阻抗分析表明,在开路电位下,Ag-CL/NiP 的 Rct 低至 491.3 Ω,表明其导电性能得到了增强。Ag-CL/NiP 的电催化氧进化反应(OER)过电位为 401 mV,电流密度为 50 mA cm-2,塔菲尔斜率为 46.5 mV.dec-1。该面板显示出良好的稳定性,在 OER 期间的 CV 耐久性超过 1000 次。当受到波长超过 420 nm 的光照射时,所开发的面板在 1.37 V 对比 RHE 时达到了令人印象深刻的 9.5 mA cm-² 光电流密度。此外,Ag-CL/NiP 面板在 4 小时的日光照射期间能够产生 17.5 mmol cm-² 的 H₂。温控光催化水分离性能表明,该面板在 12°C 以下的低温条件下仍能保持活性,但光催化效率比正常日照条件下降低了 40%。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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