Nitrogen-plasma treated hafnium oxyhydroxide as an efficient acid-stable electrocatalyst for hydrogen evolution and oxidation reactions

Yang, Xiaofang; Zhao, Fang; Yeh, Yao‐Wen; Selinsky, Rachel S.; Zhu, Chen; Yao, Nan; Tully, C.; Ju, Yiguang; Koel, Bruce E.

doi:10.1038/s41467-019-09162-5

Cited by 62 publications

(48 citation statements)

References 38 publications

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“…Such gallium oxynitrides, as for other reported oxynitrides (TaON, HfON, perovskite oxynitride, etc.) that have hybridization of the N 2p and O 2p orbitals [35][36][37][38][39] , possess better catalytic properties and perform a similar role in the electrocatalyst for better mediating charge transfer. The DFT simulation results were in line with experiments in which replacing the nitrogen atoms by oxygen to form oxynitride can passivate the surface for further stability, whereas the newly formed oxynitride can also provide more active sites for HER, leading to improved PEC performance.…”

mentioning

confidence: 99%

Development of a photoelectrochemically self-improving Si/GaN photocathode for efficient and durable H2 production

et al. 2021

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Development of an efficient yet durable photoelectrode is of paramount importance for deployment of solar-fuel production. Here, we report the photoelectrochemically self-improving behaviour of a silicon/gallium nitride photocathode active for hydrogen production with a Faradaic efficiency approaching ~100%. By using a correlative approach based on different spectroscopic and microscopic techniques, as well as density functional theory calculations, we provide a mechanistic understanding of the chemical transformation that is the origin of the self-improving behaviour. A thin layer of gallium oxynitride forms on the side walls of the gallium nitride grains, via a partial oxygen substitution at nitrogen sites, and displays a higher density of catalytic sites for the hydrogen-evolving reaction. This work demonstrates that the chemical transformation of gallium nitride into gallium oxynitride leads to sustained operation and enhanced catalytic activity, thus showing promise for oxynitride layers as protective catalytic coatings for hydrogen evolution.

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confidence: 99%

Development of a photoelectrochemically self-improving Si/GaN photocathode for efficient and durable H2 production

et al. 2021

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“…Koel and co‐workers reported a N‐containing Hf oxide (HfN x O y ) by treating hafnium oxyhydroxide with nitrogen plasma. [ 69 ] As displayed in the polarization curves in Figure 3b, the diffusion‐limited HOR current on HfN x O y is similar to Pt, demonstrating its high activity. CV curves show significant differences before and after the nitrogen plasma treatment, indicating that the treatment activates the HfN x O y surface, probably by increasing the electric conductivity of the pristine Hf oxide film, but the exact origin remains unclear.…”

Section: Non‐pgm Electrocatalysts For the Acidic Hormentioning

confidence: 87%

“…Reproduced with permission under the terms of the CC BY license. [ 69 ] Copyright 2019, the Authors, published by Springer Nature. d) Surface charge density distribution of MoO 2 , Ni 0.08 Mo 0.92 O 2 , and Ni 0.33 Mo 0.67 O 2 .…”

Section: Non‐pgm Electrocatalysts For the Acidic Hormentioning

confidence: 99%

Non‐Platinum Group Metal Electrocatalysts toward Efficient Hydrogen Oxidation Reaction

Zhao

Chen

Sun

et al. 2021

Adv Funct Materials

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Developing non‐platinum group metal (non‐PGM) electrocatalysts for the hydrogen oxidation reaction (HOR) represents the efforts towards the more economical use of hydrogen fuel cells and hydrogen energy, which has attracted tremendous attention recently. However, non‐PGM electrocatalysts for the HOR are still in their early development stages as compared with the significant advances in those for the oxygen reduction reaction and hydrogen evolution reaction. Herein, this paper summarizes the recent progresses and highlights the key challenges for the rational design of non‐PGM electrocatalysts, aiming to promote the development of non‐PGM HOR electrocatalysts. Fundamental understandings of the HOR mechanism are firstly reviewed, where theoretical interpretations on the low HOR kinetics in alkaline media, including the hydrogen binding energy theory, the bifunctional mechanism, and the water molecule reorganization, are particularly discussed. Subsequently, progresses of typical non‐PGM HOR electrocatalysts in acid and alkaline media are summarized separately. For the HOR under alkaline conditions, the superiorities and challenges of Ni‐based catalysts are discussed with a particular focus as they are the most promising non‐PGM electrocatalysts. Finally, this paper highlights the challenges and provide perspectives on the future development directions of non‐PGM HOR electrocatalysts.

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“…[ 8 ] The electrocatalysis driven by hydrogen evolution/oxidation reactions (HER/HOR) over the H 2 anode offers minimal overpotentials, high rates, and stable electrochemical performance towards hydrogen gas batteries. [ 9 ] Previously, our group transformed conventional nickel‐hydrogen gas batteries via coupling solid Ni(OH) 2 /NiOOH cathode with the H 2 anode. Resultant Ni‐H 2 chemistry comes out with a high areal capacity of 35.5 mAh cm −2 and stable working operation over 600 cycles.…”

Section: Introductionmentioning

confidence: 99%

An Ultrastable Aqueous Iodine‐Hydrogen Gas Battery

Zhu

Meng

Cui

et al. 2021

Adv Funct Materials

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Rechargeable hydrogen gas batteries are highly desirable for large‐scale energy storage because of their long life cycle, high round trip efficiency, fast reaction kinetics, and hydrogen gas profusion. Coupling advanced cathode chemistries with hydrogen gas anode is an emerging and exciting area of research. Here, a novel high‐performance aqueous iodine‐hydrogen gas (I2‐H2) battery using iodine as cathode and hydrogen gas as the electrocatalytic anode in environmentally benign aqueous electrolytes is reported. The working chemistry of the battery involves I2/I− solid‐liquid reactions occurring over the cathode along with H2/H2O gas‐liquid reactions at the anode, achieving a high rate performance of 100 C and long‐lasting stability of over 60 000 cycles. Additionally, the static aqueous I2‐H2 battery displays a volumetric capacity of 15.5 Ah L−1 along with good self‐healing capability towards cell overcharge. The current battery design exhibits robust electrochemical performance irrespective of acidic, neutral, and alkaline electrolyte systems. This study paves the way towards the industrialization of economically effective, high‐power density, and long‐term I2‐H2 batteries for large‐scale energy storage applications.

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Nitrogen-plasma treated hafnium oxyhydroxide as an efficient acid-stable electrocatalyst for hydrogen evolution and oxidation reactions

Cited by 62 publications

References 38 publications

Development of a photoelectrochemically self-improving Si/GaN photocathode for efficient and durable H2 production

Development of a photoelectrochemically self-improving Si/GaN photocathode for efficient and durable H2 production

Non‐Platinum Group Metal Electrocatalysts toward Efficient Hydrogen Oxidation Reaction

An Ultrastable Aqueous Iodine‐Hydrogen Gas Battery

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