Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 14, Issue 19, Pages 22061-22070Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.2c01643
Keywords
bimetallic hydrogen phosphate; nickel nitride nanosheet arrays; electrodepositing; bifunctional electrocatalysts; seawater splitting
Funding
- National Natural Science Foundation of China [22075159, 21905149]
- Taishan Scholar Program [tsqn202103058]
- China Postdoctoral Science Foundation [2020M671990]
- Youth Innovation Team Project of Shandong Provincial Education Department [2019KJC023]
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The development of high-performance non-noble bifunctional catalysts for seawater electrolysis is challenging. In this study, a sandwich-like catalyst NiCoHPi@Ni3N/NF with a hierarchical structure is reported, demonstrating good oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) activity in alkaline simulated seawater electrolyte.
Developing high-performance non-noble bifunctional catalysts is pivotal for large-scale seawater electrolysis but remains a challenge. Here we report a sandwichlike NiCo(HPO4)(2)@Ni3N/NF (denoted by NiCoHPi@Ni3N/NF) catalyst. Vertical Ni3N nanosheet arrays are first grown and supported on nickel foam, and then a bimetallic NiCoHPi coating is decorated on Ni3N nanosheets by one-step electrodeposition. The hierarchical sandwich like structure offers a large surface area and plenty of catalytic active sites, and the coupling of interconnected Ni3N and NiCoHPi accelerates the electron transfer. Moreover, the surficial hydrogen phosphate ions contribute to a proper OH- absorption capacity due to the Lewis acid-base reaction. As a result, the NiCoHPi@Ni3N/NF catalyst exhibits good OER and HER activity, requiring overpotentials of 365 mV (for OER) and 174 mV (for HER) to deliver 100 mA cm(-2) in the alkaline simulated seawater electrolyte. When assembled the NiCoHPi@Ni3N/NF catalyst as both the anode and cathode, it only needs 1.86 V to reach 100 mA cm(-2) in alkaline simulated seawater electrolyte. This work may inspire the design and exploration of self-supported hierarchical composite electrocatalysts for hydrogen production from the electrolysis of seawater.
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