Hydrogen production from hydrogen sulfide via a uniquely designed electrolysis process: experimental investigation

IF 7.5 1区工程技术 Q2 ENERGY & FUELS

Fuel Pub Date : 2025-10-15 DOI:10.1016/j.fuel.2025.137096

Muhammad Ishaq, Ibrahim Dincer

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Abstract

The present work aims to develop a uniquely designed experimental test rig for hydrogen (H₂) production from hydrogen sulfide (H₂S) and perform performance tests. The experimental activity focuses on the FeCl₃ hybrid process for H₂S cracking, followed by H₂S absorption, sulfur purification, and electrolysis for efficient H₂ production. Hydrogen production is studied using KOH and FeCl₃ electrolytes under varying temperatures between 20-80 °C. An electrochemical impedance spectroscopy (EIS) is employed to characterize the electrochemical cell under potentiostatic (0.5-2.0 V) and galvanostatic (0-0.5 mA) modes to analyze the system’s electrochemical response. The study results showed that hydrogen production increased by over 426 % from 20 °C to 80 °C. EIS analysis under potentiostatic mode showed Nyquist semicircle diameter reduced as the applied voltage increased from 0.5 V to 1.5 V, and phase angle shifted from -5.59° to -1.27°, confirming enhanced conductivity. Under galvanostatic mode, the impedance dropped from ∼25 Ω to ∼21 Ω as current increased, demonstrating improved kinetics for efficient H₂ production.

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通过独特设计的电解过程从硫化氢制氢：实验研究

目前的工作旨在开发一个独特设计的实验测试平台，用于从硫化氢（H2S）中生产氢气（H2）并进行性能测试。实验活动主要集中在FeCl3混合H2S裂解工艺，然后是H2S吸附、硫净化和电解以实现高效制氢。研究了KOH和FeCl3电解质在20-80℃不同温度下的制氢。采用电化学阻抗谱（EIS）对恒电位（0.5 ~ 2.0 V）和恒流（0 ~ 0.5 mA）模式下的电化学电池进行表征，分析系统的电化学响应。研究结果表明，从20°C到80°C，产氢量增加了426%以上。恒电位模式下的EIS分析显示，当外加电压从0.5 V增加到1.5 V时，Nyquist半圆直径减小，相位角从-5.59°变化到-1.27°，电导率增强。在恒流模式下，随着电流的增加，阻抗从~ 25 Ω降至~ 21 Ω，表明有效产氢的动力学得到了改善。

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来源期刊

Fuel 工程技术-工程：化工

CiteScore

12.80

自引率

20.30%

发文量

3506

审稿时长

64 days

期刊介绍： The exploration of energy sources remains a critical matter of study. For the past nine decades, fuel has consistently held the forefront in primary research efforts within the field of energy science. This area of investigation encompasses a wide range of subjects, with a particular emphasis on emerging concerns like environmental factors and pollution.