Journal
ACS CATALYSIS
Volume 8, Issue 6, Pages 5200-5205Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.8b01076
Keywords
transition-metal hydroxides; tungsten modulation; amorphous; electrodeposition; neutral hydrogen evolution reaction
Categories
Funding
- National Natural Science Foundation of China [21573068]
- National Natural Science Funds for Distinguished Young Scholar [51725201]
- Fundamental Research Funds for the Central Universities [222201718002, 222201714001]
- China Postdoctoral Science Foundation [2016M601523]
- National Postdoctoral Program for Innovative Talents [BX201600050]
- Shanghai Sailing Program [17YF1402900]
- Chen Guang project - Shanghai Municipal Education Commission and Shanghai Education Development Foundation [16CG31]
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Developing efficient, low-cost, and biocompatible electrocatalysts toward hydrogen evolution reaction (HER) in neutral environments is vital to the development of a hybrid water splitting biosynthetic system to achieve high-efficiency solar-to-fuels conversion. We report here a strategy to improve the sluggish HER kinetics on 3d transition metal hydroxides by incorporating tungsten through a one-step electrodeposition method. The prepared amorphous CoW-(OH)(x) delivers high HER activity in neutral solution, which only requires overpotentials of -73.6 and -114.9 mV to achieve the current densities of -10 and -20 mA cm(-2) in 1.0 M phosphate buffer solution (PBS), respectively. The activity can be ascribed to the synergistic effects between Co and W, where Co sites facilitate H2O dissociation to generate H-ad intermediates and W sites could effectively convert H-ad to H-2. Meanwhile, the amorphous architecture features homogeneously dispersed Co and W atoms that avoid crystalline phase separation, further strengthening their collaborative interactions. Similar enhanced HER activity is also observed on the electrodeposited NiW(OH)(x) electrocatalyst, suggesting the universality of this strategy for accelerating HER in neutral environments.
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