Water Splitting Catalysis Studied by using Real‐Time Faradaic Efficiency Obtained through Coupled Electrolysis and Mass Spectrometry

Svengren, Henrik; Chamoun, Mylad; Grîns, Jêkabs; Johnsson, Mats

doi:10.1002/celc.201701086

Cited by 13 publications

(10 citation statements)

References 39 publications

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“…It is seen that the measured and calculated H 2 gas production, i.e., half of the photo-generated electron density, agree well, confirming a nearly unity faradic efficiency wherein all extracted photoexcited electrons drive solar water reduction reaction efficiently. 21,60 Long-Term Stability for Unassisted Solar Water Splitting Long-term stability evaluation of such In 0.25 Ga 0.75 N nanowire photocathode for unassisted solar water splitting was further performed at 0 V versus Pt counter electrode in 0.5 M H 2 SO 4 electrolyte solution under simulated one-sun illumination. Shown in Figure 5 is the measured photocurrent retention ratio over time.…”

Section: Design and Synthesis Of Single-junction Ingan Nanowire Photomentioning

confidence: 99%

A Single-Junction Cathodic Approach for Stable Unassisted Solar Water Splitting

Wang

Schwartz

et al. 2019

Joule

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A single-junction InGaN nanowire photocathode monolithically integrated on silicon wafer was demonstrated to drive relatively efficient and stable solar water splitting. A solar-to-hydrogen (STH) conversion efficiency of 3.4% was measured at zero bias in two-electrode configuration under AM1.5G one-sun illumination. The InGaN nanowire photocathode can operate efficiently for 300 h of unassisted solar water splitting without using extra surface protection.

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Section: Design and Synthesis Of Single-junction Ingan Nanowire Photomentioning

confidence: 99%

A Single-Junction Cathodic Approach for Stable Unassisted Solar Water Splitting

Wang

Schwartz

et al. 2019

Joule

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“…Then this was subtracted from the corresponding equilibrium potential value to get the overpotential. The in operando charge efficiency measurements have been described in earlier work, where electrochemical water splitting catalysis coupled with mass spectrometry allowed the detection of gaseous products [38]. The cell consisted of two chambers and was separated by a nonwoven cellulose membrane (Freudenberg, 700/18F) and sealed with rubber gaskets (Kuntze, ESO2 425-010 EPDM).…”

Section: Experimental Methodsmentioning

confidence: 99%

Electrochemical Performance and in Operando Charge Efficiency Measurements of Cu/Sn-Doped Nano Iron Electrodes

et al. 2018

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Fe-air or Ni-Fe cells can offer low-cost and large-scale sustainable energy storage. At present, they are limited by low coulombic efficiency, low active material use, and poor rate capability. To overcome these challenges, two types of nanostructured doped iron materials were investigated: (1) copper and tin doped iron (CuSn); and (2) tin doped iron (Sn). Single-wall carbon nanotube (SWCNT) was added to the electrode and LiOH to the electrolyte. In the 2 wt. % Cu + 2 wt. % Sn sample, the addition of SWCNT increased the discharge capacity from 430 to 475 mAh g−1, and charge efficiency increased from 83% to 93.5%. With the addition of both SWCNT and LiOH, the charge efficiency and discharge capacity improved to 91% and 603 mAh g−1, respectively. Meanwhile, the 4 wt. % Sn substituted sample performance is not on par with the 2 wt. % Cu + 2 wt. % Sn sample. The dopant elements (Cu and Sn) and additives (SWCNT and LiOH) have a major impact on the electrode performance. To understand the relation between hydrogen evolution and charge current density, we have used in operando charging measurements combined with mass spectrometry to quantify the evolved hydrogen. The electrodes that were subjected to prolonged overcharge upon hydrogen evolution failed rapidly. This insight could help in the development of better charging schemes for the iron electrodes.

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“…Where, I = current, t = time, Z = number of electrons that are exchanged in order to release one particle at electrode, F = Faraday's constant (96484 C/mol) [77][78][79]…”

Section: Faradic Efficiencymentioning

confidence: 99%

Recent Advancement in Metal‐Organic Framework for Water Electrolysis: A Review

2022

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An alternative to fossil fuel is essential to overcome energy shortages and resolve the environmental problem. Hydrogen production via earth-abundant water resources is a clean, sustainable, and energy-rich fuel source. For the water splitting process, the catalyst is an essential need to enhance the kinetics of the overall reaction. Therefore, noble metals are used as the state-of-the-art catalyst for the OER and HER process due to their remarkable efficiency and stability. But, their high cost and inadequacy are the main obstructs to their commercialization. To commercialize the process, researchers are trying to replace the expensive noble catalyst with a non-noble stable, conductive, and more productive catalyst. In recent decades, transition metal based metal organic framework (MOF) has been extensively used as an electro-catalyst to enhance the kinetics of the OER and HER process. MOF as an electro-catalyst is a promising candidate to improve the rate of water splitting reaction due to their inherent properties such as high surface area, tunable morphology, and high porosity. In this review, the significant data of recent years are assembled for the water splitting process by using the MOFs as an electro-catalyst. This review not only captures the advancement in MOF materials with the effective approach of designing but also indicates the catalyst evaluation parameters and detailed mechanism of the HER and the OER process. Meanwhile, challenges and future prospectus of the MOF based catalyst for the water splitting process are also described here. Hopefully, this review article will help to develop a more productive MOF for the generation of green and sustainable hydrogen.

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Water Splitting Catalysis Studied by using Real‐Time Faradaic Efficiency Obtained through Coupled Electrolysis and Mass Spectrometry

Cited by 13 publications

References 39 publications

A Single-Junction Cathodic Approach for Stable Unassisted Solar Water Splitting

A Single-Junction Cathodic Approach for Stable Unassisted Solar Water Splitting

Electrochemical Performance and in Operando Charge Efficiency Measurements of Cu/Sn-Doped Nano Iron Electrodes

Recent Advancement in Metal‐Organic Framework for Water Electrolysis: A Review

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