Junhu Ma
Junhu Ma has a total of 11 co-authors. Here are the top co-authors by number of shared publications:
- Quanbin Huang
Key Laboratory of Pico Electron Microscopy of Hainan Province, School of Materials Science and Engineering, Hainan University, Haikou 570228, China
2 shared publications - Shiwei Lin
Key Laboratory of Pico Electron Microscopy of Hainan Province, School of Materials Science and Engineering, Hainan University, Haikou 570228, China
2 shared publications - Yipu Liu
Key Laboratory of Pico Electron Microscopy of Hainan Province, School of Materials Science and Engineering, Hainan University, Haikou 570228, China
2 shared publications - Hailong Xi
State Key Laboratory of Ni&Co Associated Minerals Resources Development and Comprehensive Utilization, Jinchang 737101, China
1 shared publication - Hongfu Gao
State Key Laboratory of Ni&Co Associated Minerals Resources Development and Comprehensive Utilization, Jinchang 737101, China
1 shared publication - Juan Zhang
State Key Laboratory of Ni&Co Associated Minerals Resources Development and Comprehensive Utilization, Jinchang 737101, China
1 shared publication
Latest Publications
- Open Access
Scalable Electro-Oxidation Engineering of Raney Nickel Toward Enhanced Oxygen Evolution Reaction
The efficiency and durability of oxygen evolution reaction (OER) catalysts at industrially relevant current high densities are critical determinants of energy consumption and operating cost of alkaline electrolyzers. However, Raney nickel, widely adopted as a commercial electrode, still lacks sufficient intrinsic activity, leading to excessive energy consumption. Herein, a facile electro-oxidation engineering strategy with strong industrial compatibility is developed, and constructs a high-performance OER electrode Raney Ni–Fe3+ without compromising the inherent stability and scalability. The optimized electrode achieves 100 mA/cm2 at a small overpotential of 265.1 mV with a Tafel slope of 36.17 mV/dec. It further demonstrates exceptional durability, remaining stable for at least 100 h at 300 mA/cm2. By in situ constructing Fe3+-doped NiOOH phases on the Raney Ni framework, the proposed strategy effectively realizes the precise synthesis of high-performance active layers and greatly enhances the intrinsic catalytic activity. This work provides a new perspective for improving alkaline electrolyzer efficiency and contributing to the large-scale advancement of green hydrogen technology.
Open AccessScalable Electro-Oxidation Engineering of Raney Nickel Toward Enhanced Oxygen Evolution Reaction
The efficiency and durability of oxygen evolution reaction (OER) catalysts at industrially relevant current high densities are critical determinants of energy consumption and operating cost of alkaline electrolyzers. However, Raney nickel, widely adopted as a commercial electrode, still lacks sufficient intrinsic activity, leading to excessive energy consumption. Herein, a facile electro-oxidation engineering strategy with strong industrial compatibility is developed, and constructs a high-performance OER electrode Raney Ni–Fe3+ without compromising the inherent stability and scalability. The optimized electrode achieves 100 mA/cm2 at a small overpotential of 265.1 mV with a Tafel slope of 36.17 mV/dec. It further demonstrates exceptional durability, remaining stable for at least 100 h at 300 mA/cm2. By in situ constructing Fe3+-doped NiOOH phases on the Raney Ni framework, the proposed strategy effectively realizes the precise synthesis of high-performance active layers and greatly enhances the intrinsic catalytic activity. This work provides a new perspective for improving alkaline electrolyzer efficiency and contributing to the large-scale advancement of green hydrogen technology.
- Open Access
Engineering Amorphous CoNiRuOx Nanoparticles Grown on Nickel Foam for Boosted Electrocatalytic Hydrogen Evolution
Designing efficient and cost-effective electrocatalysts is crucial for the large-scale development of sustainable hydrogen energy. Amorphous catalysts hold great promise for application due to their structural flexibility and high exposure of active sites. We report a novel method for the in situ growth of amorphous CoNiRuOx nanoparticle structures (CoNiRuOx/NF) on a nickel foam substrate. In 1 m KOH, CoNiRuOx/NF achieves a current density of 10 mA/cm2 with a hydrogen evolution reaction (HER) overpotential of only 43 mV and remains stable for over 100 h at a current density of 100 mA/cm2. An alkaline electrolyzer assembled with CoNiRuOx/NF as the cathode delivers a current density 2.97 times higher than that of an IrO2||Pt/C electrode pair at the potential of 2 V and exhibits excellent long-term durability exceeding 100 h. Experimental results reveal that the combined replacement and corrosion reactions facilitate the formation of the amorphous CoNiRuOx structure. This work provides valuable insights for developing efficient and scalable amorphous catalysts.
Open AccessEngineering Amorphous CoNiRuOx Nanoparticles Grown on Nickel Foam for Boosted Electrocatalytic Hydrogen Evolution
Designing efficient and cost-effective electrocatalysts is crucial for the large-scale development of sustainable hydrogen energy. Amorphous catalysts hold great promise for application due to their structural flexibility and high exposure of active sites. We report a novel method for the in situ growth of amorphous CoNiRuOx nanoparticle structures (CoNiRuOx/NF) on a nickel foam substrate. In 1 m KOH, CoNiRuOx/NF achieves a current density of 10 mA/cm2 with a hydrogen evolution reaction (HER) overpotential of only 43 mV and remains stable for over 100 h at a current density of 100 mA/cm2. An alkaline electrolyzer assembled with CoNiRuOx/NF as the cathode delivers a current density 2.97 times higher than that of an IrO2||Pt/C electrode pair at the potential of 2 V and exhibits excellent long-term durability exceeding 100 h. Experimental results reveal that the combined replacement and corrosion reactions facilitate the formation of the amorphous CoNiRuOx structure. This work provides valuable insights for developing efficient and scalable amorphous catalysts.