Journal
ACS CATALYSIS
Volume 8, Issue 5, Pages 4637-4644Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.8b01131
Keywords
hydrogen evolution reaction; oxygen evolution reaction; water splitting; electrocatalysis; cobalt nitrides
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Funding
- National Key R&D Program of China [2016YFA0200202]
- National Natural Science Foundation of China [51433005, 21674056, 51673108]
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The development of eco-friendly electrocatalysts with high performance and low cost for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is significant for renewable energy storage. Here, trace level (0.11-0.18 wt %) Co-N doped graphite foam (Co-N/GF) was reported to work as a bifunctional high-performance and self-standing electrode for both HER and OER in alkaline electrolyte. The catalytic activities of Co-N/GFs with different annealing temperatures (600, 700, 800, 900, and 1000 degrees C) were carefully studied. Among them, Co-N/GF-900 exhibited the best HER activity and Co-N/GF-700 showed the best OER activity, achieving the current density of 10 mA cm(-2) at low overpotentials of 165 and 313 mV, respectively. In addition, both of these electrodes exhibited long-term durability. Co-N/GF electrodes were further constructed as a catalytic cathode and anode couple (Co-N/GF-900 parallel to Co-N/GF-700) for overall water splitting, exhibiting a low cell voltage of 1.68 V and good long-term stability. Our work reveals that introducing a trace level of Co-N into graphite foam can significantly enhance its electrocatalytic activity and stability for both HER and OER
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