Article
Green & Sustainable Science & Technology
Dandan Wu, Xi Wang, Zixuan Wang, Xu Wu
Summary: The development of highly active and stable anodes for oxygen evolution reaction (OER) in acidic media is still a challenge. In this study, a two-step electrodeposition method was proposed to optimize the structure of IrOx electrode for improved OER performance. The optimized electrode showed low Tafel slope, low overpotential, and good stability.
MATERIALS TODAY SUSTAINABILITY
(2023)
Article
Chemistry, Physical
Sanjay Upadhyay, Rameez Ahmad Mir, O. P. Pandey
Summary: In this study, a Ni(OH)2/GO nanocomposite was successfully synthesized using an improved hummers method followed by a hydrothermal method. The nanocomposite exhibited improved oxygen evolution reaction performance with low overpotential and Tafel slope, and also showed enhanced electrochemical stability compared to bare Ni(OH)2 nanosheets.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Physical
Li Shao, Xindi Han, Lei Shi, Tongzhou Wang, Yusheng Zhang, Zhiqi Jiang, Zexiang Yin, Xuerong Zheng, Jihong Li, Xiaopeng Han, Yida Deng
Summary: This study successfully prepares a molybdate-modulated electrode for seawater electrolysis, which shows high activity and durability in oxygen evolution reaction. The in situ generated molybdate plays a critical role in stabilizing the catalytic active phase and protecting the electrode from corrosion. The findings provide a new perspective for the design of oxyanion-modified catalysts and have practical significance in seawater electrolysis.
ADVANCED ENERGY MATERIALS
(2023)
Article
Chemistry, Physical
Min Liu, Yu-Yang Sun, Yu-Xun Zhu, Lian-Kui Wu, Mei-Yan Jiang, Guang-Ya Hou, Yi-Ping Tang
Summary: A selenium-doped hierarchical Ni-based electrocatalyst was fabricated in this study, showing improved oxygen evolution reaction performance through a hydrothermal process. Experimental results indicated that under specific conditions, favorable catalytic performance could be achieved.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
Dongxiang Li, Yang Xu, Yulian Lu, Yuyun Chen, Yeyu Wu, Jun Yan, Fangkai Du, Yanzhi Zhao, Xuecai Tan
Summary: This study presents a concise strategy for the preparation of a low-cost and highly efficient electrocatalyst for hydrogen evolution reaction (HER). Hierarchical Ni-incorporated oxygen vacancies-rich tungsten oxides micro-flowers on 3D conductive carbon cloth support (Ni-W H2-550) were prepared and exhibited a low overpotential and robust stability in alkaline electrolyte solution, indicating their potential application in electrocatalytic water splitting for clean energy generation.
JOURNAL OF POWER SOURCES
(2022)
Article
Chemistry, Multidisciplinary
F. Jafari, M. B. Gholivand
Summary: A new strategy of forming a composite of NiSe2 octahedral and WO3 nanosheet as an electrocatalyst through simple hydrothermal and ultrasonic processes is proposed to enhance electrocatalytic activity significantly. The obtained NiSe2/WO3 on nickel foam exhibits outstanding durability and remarkable catalytic activity in 1.0 M potassium hydroxide solution. The catalytic activity of NiSe2/WO3 is attributed to its unique structure, increased surface area and active sites, synergistic effect, and higher ionic conductivity.
MATERIALS TODAY CHEMISTRY
(2023)
Article
Chemistry, Physical
Fataneh Jafari, Mohammad Bagher Gholivand
Summary: In order to develop an efficient catalyst for the oxygen evolution reaction (OER), achieving high current densities at low overpotentials is highly desirable. In this study, an effective and low-cost catalyst based on anchoring Ni3S2/WO3 nanocomposite over reduced graphene oxide (rGO) was synthesized and characterized. The electrochemical parameters of this catalyst as a suitable OER electrocatalyst in alkaline media on the surface of nickel foam (NF) were investigated. The results showed that the anchored Ni3S2/WO3 on rGO increased the ionic conductivity, surface area, and active sites of the electrocatalyst, decreased the charge transfer resistance, and exhibited an overpotential of 280 mV to reach 50 mA cm(-2), with a Tafel slope of about 48 mV/dec and good stability for the OER.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Energy & Fuels
Muhammad Bilal, Rashid, Amna Altaf, Nadeem Baig, Ghayoor Abbas Chotana, Raja Shahid Ashraf, Shahid Rasul, Ayman Nafady, Anwar Ul-Hamid, Manzar Sohail
Summary: In this study, a preparation method for hexagonal cobalt selenide as an electrocatalyst for oxygen evolution reaction is reported. The catalyst exhibits unique porous dendrimeric crystalline network and large electrochemical surface area, showing excellent electrochemical activity and stability.
Article
Energy & Fuels
Xuerui Yi, Fengxiang Yin, Xiaobo He, Guoru Li
Summary: Reduction of NiO to obtain highly active OER catalyst CL-prNiO through hydrothermal method is able to significantly enhance the OER activity due to its hybrid and disordered structure.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2021)
Article
Chemistry, Physical
Thi Xuyen Nguyen, Zi-Ting Huang, Jyh-Ming Ting
Summary: By optimizing the iron concentration in multi-cation oxides, the electrocatalyst with the best OER activity was obtained, showing low overpotential, small Tafel slope and excellent electrochemical stability.
APPLIED SURFACE SCIENCE
(2021)
Article
Chemistry, Physical
Theophile Niyitanga, Haekyoung Kim
Summary: In this study, bimetallic copper-cobalt oxide nanoparticles embedded on nitrogen-doped reduced graphene oxide substrates were fabricated as catalysts for the oxygen evolution reaction and hydrogen evolution reaction. The synthesized catalyst exhibited outstanding electrochemical activity, comparable to Pt/C and IrO2, and showed promise as a bifunctional catalyst for overall water splitting.
JOURNAL OF POWER SOURCES
(2023)
Article
Energy & Fuels
Raji Atchudan, N. Clament Sagaya Selvam, Thomas Nesakumar Jebakumar Immanuel Edison, Suguna Perumal, Rajangam Vinodh, Yong Rok Lee
Summary: In this study, N-doped carbon fibers-supported nickel oxide (NiO@CFs) hybrid electrocatalyst was successfully synthesized by pyrolyzing a heterogeneous mixture of synthetic disposal material and nickel salt. The unique structure of the carbon fibers supported NiO nanoparticles resulted in enhanced electrochemical activity, with increased surface area and improved oxygen evolution reaction performance. This environmentally friendly methodology of utilizing synthetic disposal materials for carbon support incorporation shows great potential for various electrochemical applications.
Article
Chemistry, Physical
Malarkodi Duraivel, Saravanan Nagappan, Kang Hyun Park, Kandasamy Prabakar
Summary: Halloysite nanotubes (HNT) are naturally occurring one-dimensional porous clay minerals with hydroxyl functional groups suitable for O2 evolution reaction. Coating HNT-based electrocatalyst on Ni foam substrate shows excellent water oxidation activity and stability in alkaline electrolyte solution.
APPLIED CLAY SCIENCE
(2022)
Article
Chemistry, Physical
Vikas Pundir, Ashish Gaur, Rajdeep Kaur, Jatin Sharma, Rajinder Kumar, Vivek Bagchi
Summary: A nano-sheet catalyst with high efficiency in water splitting was developed through the design and construction of multi-heterointerfaces, demonstrating high current density and stability in hydrogen and oxygen evolution reactions.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Chemistry, Physical
Chongtao Ding, Yao Yu, Yu Wang, Yang Mu, Xueying Dong, Changgong Meng, Chi Huang, Yifu Zhang
Summary: Phosphate-incorporated cobalt silicate hydroxide (CoSi-P) is reported as a potential electrocatalyst for oxygen evolution reaction (OER), demonstrating low overpotential, large electrochemical active surface area, and low Tafel slope. This study suggests that the incorporation of phosphate in the structure of CoSi can enhance its OER performance, providing a new direction for the design of non-noble metal catalysts.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Chemistry, Physical
Zhen Qiu, Daniel Martin-Yerga, Par A. Linden, Gunnar Henriksson, Ann Cornell
Summary: In this study, two different catalytic materials, PdNi and NiO, were investigated for the oxidation reaction of carbohydrate degradation products. The results showed that the PdNi catalyst could catalyze the products at low potential requirements but had limited current density. On the other hand, the NiO catalyst could operate at high current densities but required relatively higher potentials. Compared to Pd-based catalysts, this non-noble metal catalyst exhibited better performance at high conversion rates, indicating its potential for sustainable hydrogen production using waste streams.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Physical
Nicole A. Sagui, Petter Strom, Tomas Edvinsson, Ilknur Bayrak Pehlivan
Summary: In this study, Ta-doped NiO thin films were prepared and the effect of surface electronic modulation on the catalysis of the oxygen evolution reaction (OER) was investigated. It was found that Ta impurities can enhance the OER performance by increasing the valence state of Ni sites and promoting the formation of high-valence γ-NiOOH species. This study provides insight into the design and optimization of earth-abundant electrocatalysts for clean hydrogen production.
Article
Chemistry, Physical
Xiaowen Yu, Rafael B. Araujo, Zhen Qiu, Egon Campos dos Santos, Athira Anil, Ann Cornell, Lars G. M. Pettersson, Mats Johnsson
Summary: This study demonstrates the effectiveness of CoMoO4 catalyst for glycerol oxidation reaction, with high selectivity and efficiency, enabling the production of value-added products and high-purity hydrogen.
ADVANCED ENERGY MATERIALS
(2022)
Article
Chemistry, Physical
Rafael B. Araujo, Ilknur Bayrak Pehlivan, Tomas Edvinsson
Summary: In this study, a computational approach using density functional theory and deep neural networks is introduced to predict the performance of high-entropy alloys (HEAs) in the electrochemical reduction of nitrogen. The approach quantifies the catalytic activity of HEA catalysts by optimizing the elements and concentration to increase the probability of specific atomic arrangements on the surfaces. The approach provides a quick and effective way to filter HEA candidates without the need for time-consuming calculations.
Article
Chemistry, Physical
Giovanni Spinelli, George H. Morritt, Michele Pavone, Michael R. Probert, Paul G. Waddel, Tomas Edvinsson, Ana Belen Munoz-Garcia, Marina Freitag
Summary: Two coordination complexes were synthesized by combining different metal centers with dithiolene complexes [M(mnt)(2)](2-) and a copper(II) coordination complex [Cu(Stetra)]. The Cu-Cu variant exhibited semiconductor behavior with a conductivity of approximately 2.5 x 10(-8) S cm(-1), whereas the Ni-Cu variant showed no observable conductivity. Computational studies revealed that Cu-Cu had lower reorganization energy losses, resulting in a lower barrier to the charge transfer process, which explains its higher conductivity.
ACS APPLIED ENERGY MATERIALS
(2023)
Review
Chemistry, Multidisciplinary
Jakob Thyr, Tomas Edvinsson
Summary: Micro-Raman spectroscopy is an important tool in various scientific disciplines, used for identification of chemical bonds and detailed analysis of molecular interactions, material strain, crystallinity, defects, and bond formations. However, Raman scattering suffers from a low probability process, dependent on sensitive detection systems that may also pick up signals from sources other than the sample, complicating data analysis and increasing the risk of misinterpretation. This study provides an overview of spurious signals in Raman spectra, their origins, and methods to identify and counteract them.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Electrochemistry
Mario Valvo, Jakob Thyr, Tomas Edvinsson
Summary: In this study, 2D Cu2O coatings and 3D copper nanopillar structures were compared for their photocatalytic performance. The structures were characterized using X-ray diffraction, Raman spectroscopy, and electron microscopy. It was found that the 3D nanopillar structures showed enhanced photocatalytic efficiency compared to the 2D coatings.
Article
Chemistry, Physical
Rafael B. Araujo, Tomas Edvinsson
Summary: Using high-entropy alloys as catalysts can enhance the fixation of N2, solving the challenge of N2 fixation on catalytic surfaces. The bond strength between N2 molecules and the surfaces of high-entropy alloys is regulated by the local environment of the adsorbing elements through electron donor-acceptor interactions.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Chemistry, Physical
Giovanni Spinelli, George H. Morritt, Michele Pavone, Michael R. Probert, Paul G. Waddel, Tomas Edvinsson, Ana Belen Munoz-Garcia, Marina Freitag
Summary: Two coordination complexes were synthesized by combining the dithiolene complexes [M(mnt)2]2- (mnt = maleonitriledithiolate; M = Ni2+ or Cu2+) as anion with the copper(II) coordination complex [Cu(Stetra)] (Stetra = 6,6 '- bis(4,5-dihydrothiazol-2-yl)-2,2 '-bipyri-dine) as cation. The variation of metal centers led to a significant change in conductivity, with the Cu2+ variant (Cu-Cu) displaying semiconductor behavior, while the Ni2+ variant (Ni-Cu) showed no observable conductivity. Computational studies revealed that Cu-Cu exhibited minimized reorganization energy losses and a lower barrier to the charge transfer process, resulting in higher conductivity.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Environmental Sciences
Jon Lima-Zaloumis, Anna Neubeck, Magnus Ivarsson, Maitrayee Bose, Rebecca Greenberger, Alexis S. Templeton, Andrew D. Czaja, Peter B. Kelemen, Tomas Edvinsson
Summary: Detection of microbial remains and potential dubiofossils in a mineralized fracture within drill cores from the Samail Ophiolite suggests that serpentinizing environments can preserve morphological evidence of rock-hosted microbial life. The presence of filamentous structures and carbon and nitrogen rich laminated structures further support the existence of subsurface microbial communities.
COMMUNICATIONS EARTH & ENVIRONMENT
(2022)
Article
Chemistry, Physical
Meysam Pazoki, Roghayeh Imani, Andreas Rockert, Tomas Edvinsson
Summary: This study investigates the electronic properties and the influence of spacing of two-dimensional lead perovskite materials. It shows that larger cations decrease the electrostatic interaction between the layers, and spin-orbit coupling splits the conduction band states and lowers the bandgap. The spacing directly affects band curvature and charge carrier mobility perpendicular to the layers.
JOURNAL OF MATERIALS CHEMISTRY A
(2022)
Article
Chemistry, Multidisciplinary
Roghayeh Imani, Carlos H. Borca, Meysam Pazoki, Tomas Edvinsson
Summary: Through calculations of the electronic structure of mixed cation perovskites, the study found that there were negligible differences in optical band gap and total density of states between Cs formamidinium mixed cationic lead iodide and single monovalent cation hybrid perovskite. However, significant differences were observed in carrier effective mass, local atomic density of states, directional transport, and structural distortions.
Article
Chemistry, Multidisciplinary
Luca D'Amario, Maria Bruna Stella, Tomas Edvinsson, Maurizio Persico, Johannes Messinger, Holger Dau
Summary: This study describes a transient spectro-electrochemical Raman setup that achieves sub-ms time resolution, allowing for the study of electrochemical processes. The technique was validated through experiments and confirmed to be effective in assigning spectral properties to transient species. This research provides a foundational contribution to the development of next generation electrolizers, fuel cells, and batteries.
Article
Chemistry, Physical
Ilknur Bayrak Pehlivan, Nicole A. Sagu, Johan Oscarsson, Zhen Qiu, Walter Zwaygardt, Minoh Lee, Martin Mueller, Stefan Haas, Lars Stolt, Marika Edoff, Tomas Edvinsson
Summary: Photovoltaic (PV) electrolysis is an important technology for environmentally-friendly fuel production, but challenges remain in upscaling and maintaining high efficiency in larger modules.
JOURNAL OF MATERIALS CHEMISTRY A
(2022)
Article
Chemistry, Physical
Hannes Michaels, Matthias J. Golomb, Byeong Jo Kim, Tomas Edvinsson, Fabio Cucinotta, Paul G. Waddell, Michael R. Probert, Steven J. Konezny, Gerrit Boschloo, Aron Walsh, Marina Freitag
Summary: Emerging technologies in solar energy play a critical role in addressing energy challenges and achieving carbon neutrality. Limitations in charge transport materials hinder the development of energy conversion and storage technologies. Low-dimensional coordination polymers offer a viable alternative with molecular building blocks for efficient charge transport.
JOURNAL OF MATERIALS CHEMISTRY A
(2022)