Article
Energy & Fuels
Derya Oncel Ozgur
Summary: This work presents a novel nickel@nitrogen-doped graphene@MoS2 (Ni@N-Gr/ MoS2) triad heterostructure for catalytic HER. The as-synthesized Ni@N-Gr/MoS2 assembly exhibits high intrinsic HER activity and stability, thanks to the incorporation of Ni@N-Gr in the basal plane of MoS2 and the improvement of conductivity by nitrogen-doped graphene.
Article
Chemistry, Physical
Qikang Wu, Yuqin Zhu, Jiahui Guo, Songrui Wang, Xueqing Feng, Zheng Chen
Summary: By doping oxygen, enriching sulfur, and controlling the ratio of thiourea to sodium molybdate, the number of active sites in molybdenum sulfide can be increased, thereby improving its catalytic performance.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
Gyawali Ghanashyam, Hae Kyung Jeong
Summary: In this study, flower-like nickel-doped molybdenum disulfide (Ni-MoS2) catalysts were synthesized via a hydrothermal method for electrocatalysis, exhibiting high catalytic activity and stability. The addition of nickel at a concentration of 11% led to an overpotential of -160 mV for the hydrogen evolution reaction at -10 mA/cm2 and 240 mV for the oxygen evolution reaction at +10 mA/cm2, with corresponding Tafel slopes of 79 and 102 mV/dec, respectively. The optimal bifunctional catalytic activities were attributed to the 11% nickel doping, which introduced a metallic 1 T phase, improved conductivity, and increased electrochemical surface area.
CHEMICAL PHYSICS LETTERS
(2023)
Article
Chemistry, Analytical
Gyawali Ghanashyam, Hae Kyung Jeong
Summary: This study develops a flower-shaped plasma-treated iron-doped MoS2 with higher electrocatalytic activity and electrical conductivity. The synthesized material shows enhanced catalytic performance for both hydrogen and oxygen evolution reactions. The development of 1T phase on the Fe-doped MoS2 could have broad applications in modifying other energy materials.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2023)
Article
Chemistry, Physical
Jagadis Gautam, Debabrata Chanda, Mikiyas Mekete Meshesha, Seok Gwon Jang, Bee Lyong Yang
Summary: Heterointerface engineering is a promising strategy for creating efficient catalysts by enhancing catalytic active centers and charge transfer capabilities. In this study, a novel heterostructure of manganese cobalt sulfide-molybdenum disulfide on nickel foam (MnCo2S4-MoS2/NF) was synthesized and showed accelerated charge transfer ability and multiple integrated active sites. The MnCo2S4-MoS2/NF display low overpotentials for HER and OER, surpassing commercial and previously reported catalysts, making them a potential candidate for overall water splitting.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Electrochemistry
Nawras Abidi, Audrey Bonduelle-Skrzypczak, Stephan N. Steinmann
Summary: This study investigates the possibility of using substitutional doping to activate the basal surface of MoS2 for hydrogen evolution reaction (HER) catalysts. Through a density functional theory (DFT) screening, it is found that most dopants preferentially locate at the edges rather than the basal plane, requiring advanced synthesis methods for obtaining basal-plane doped catalysts. The electrocatalytic activity of the doped MoS2 nanosheets is significantly enhanced compared to pristine MoS2. The most promising systems identified are Ti, Zr, and Hf dimers, as well as sulfur substitution by phosphorus, which exhibit stable active sites on the basal plane with overpotentials of about 0.2 V.
ELECTROCHIMICA ACTA
(2023)
Article
Chemistry, Inorganic & Nuclear
Gyawali Ghanashyam, Hae Kyung Jeong
Summary: Research has shown that molybdenum disulfide-based catalysts have exceptional performance in the hydrogen evolution reaction (HER), but there has been minimal research on the oxygen evolution reaction (OER). In this study, flower-like molybdenum disulfide was synthesized using a hydrothermal method to enhance bifunctional HER and OER activity. The improved performance is attributed to the expanded electrochemical active surface area, which provides abundant exposed active sites and increases electrochemical conductivity. This research highlights a controllable one-step hydrothermal method for the synthesis and design of flower-like molybdenum disulfide, which is highly beneficial in clean and green energy conversion.
INORGANICA CHIMICA ACTA
(2022)
Article
Chemistry, Physical
Yang Li, Qinfen Gu, Bernt Johannessen, Zhi Zheng, Can Li, Yuting Luo, Zhiyuan Zhang, Qi Zhang, Haining Fan, Wenbin Luo, Bilu Liu, Shixue Dou, Huakun Liu
Summary: The study focuses on enhancing the HER performance of MoS2 through Pt doping and achieving partial phase conversion from 2H to 1T. It reveals the significance of Pt atom in electronic structure modulation of MoS2 and identifies the most active HER site in MoS2 as the S atom adjacent to Pt.
Article
Chemistry, Physical
Li Gong, Xiao Mu, Qiang Li, Lei Ma, Yucong Xiong, Rong Li
Summary: An efficient electrocatalyst NC@Mo2C@MoS2-(Ni) was designed for the Hydrogen Evolution Reaction in water electrolysis, showing good catalytic performance in both acidic and basic media. This work not only fabricates a catalyst for hydrogen evolution, but also provides a method to design more efficient functional electrocatalysts.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
Gyawali Ghanashyam, Hae Kyung Jeong
Summary: Molybdenum disulfide (MoS2) is synthesized by the hydrothermal method and shows bifunctional electrocatalytic activity. The morphology of MoS2 changes from flakes to flower shapes over time. The synthesized MoS2 sample at 200°C for 48 hours exhibits the best performance for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), with low Tafel slope and overpotential for both reactions.
Article
Electrochemistry
Qiuchen Xu, Yanxia Liu, Zhangmin Tian, Yingying Shi, Zhen Wang, Wenjun Zheng
Summary: The study designs a P-CoS1.097@MoS2/CC heterostructure electrocatalyst by constructing a heterogeneous interface and generating sulfur vacancies, showing excellent performance in the hydrogen evolution reaction.
This research paves the way for the development of MoS2-based catalysts for efficient electrocatalytic hydrogen evolution process.
ELECTROCHIMICA ACTA
(2021)
Article
Chemistry, Physical
Shihao Wang, Longlu Wang, Lingbin Xie, Weiwei Zhao, Xia Liu, Zechao Zhuang, YanLing Zhuang, Jing Chen, Shujuan Liu, Qiang Zhao
Summary: Defect engineering is an effective strategy to optimize the catalytic performance of MoS2 by introducing dislocations. This study successfully synthesized numerous dislocation-strained structures in MoS2 nanosheets through low-temperature hydrothermal synthesis. The high-density dislocations and corresponding strain field resulted in superior catalytic activity under visible light. This work provides a new pathway for improving the catalytic activity of MoS2 through dislocation-strained synergistic modulation.
Article
Energy & Fuels
Daniel Kobina Sam, Shanhe Gong, Arulappan Durairaj, Ebenezer Kobina Sam, Jun Liu, Xiaomeng Lv
Summary: The rational design and construction of a bifunctional N-doped electrocatalyst composed of cobalt and nanoscaled molybdenum carbide anchored on N-doped carbon greatly enhances its catalytic activity for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in alkaline medium.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2021)
Article
Energy & Fuels
Gizem Yanalak, Seda Yilmaz, Zafer Eroglu, Emre Aslan, Onder Metin, Imren Hatay Patir
Summary: New photocatalysts consisting of 2D/2D heterojunction of graphitic carbon nitride (gCN) and molybdenum disulfide (MoS2) semiconductors doped with nickel (Ni) or cobalt (Co) were fabricated for the photocatalytic hydrogen evolution reaction (HER) under visible light illumination. The prepared gCN/MoS2-Ni and gCN/MoS2-Co photocatalysts exhibited enhanced HER activities and stabilities compared to pristine gCN and binary gCN/MoS2 heterojunctions.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Article
Chemistry, Physical
Gyawali Ghanashyam, Hae Kyung Jeong
Summary: Molybdenum disulfide (MoS2) modified with ambient solution plasma shows improved performance in hydrogen and oxygen evolution reactions (HER and OER). The modified MoS2 exhibits low overpotential and Tafel slope, attributed to increased surface area and reduced impedance. Time-dependent plasma treatment also affects the modification, with the optimal time of 90 minutes showing better performance in HER and OER.
CHEMICAL PHYSICS LETTERS
(2022)
