Activity enhancement via borate incorporation into a NiFe (oxy)hydroxide catalyst for electrocatalytic oxygen evolution
KAUST DepartmentChemical Science Program
KAUST Catalysis Center (KCC)
Physical Science and Engineering (PSE) Division
Permanent link to this recordhttp://hdl.handle.net/10754/631304
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AbstractThe oxygen evolution reaction (OER) is a key process in electrocatalysis and is critical for achieving the cost-effective conversion of renewable electricity to chemicals and fuels. However, the high overpotential (η) originates from poor charge-transfer ability and low catalytic activity may lead to high power consumption. Herein, we alleviate these issues by introducing borate into the NiFe (oxy)hydroxide framework. Our density functional theory (DFT) calculations demonstrated that the borate could be efficiently adsorbed onto the Ni/NiFe (oxy)hydroxide surface. Microscopically, the adsorbed borate can induce a favorable electronic structure for the Ni active sites. Meanwhile, the macroscopic charge-transfer ability of this synthesized catalyst has been dramatically increased. Hence, the catalytic performance of this material is improved compared with its NiFe counterpart: we achieved a higher OER activity with an ultralow η of only 230 mV at 10 mA cm on a glassy carbon electrode (GCE) and of 200 mV at 10 mA cm on Ni foam in alkaline medium. Moreover, this borate mediated NiFe (oxy)hydroxide is very stable: no appreciable degradation is observed after more than 110 hours of operation.
CitationWang N, Cao Z, Kong X, Liang J, Zhang Q, et al. (2018) Activity enhancement via borate incorporation into a NiFe (oxy)hydroxide catalyst for electrocatalytic oxygen evolution. Journal of Materials Chemistry A 6: 16959–16964. Available: http://dx.doi.org/10.1039/c8ta04762f.
SponsorsThe authors gratefully acknowledge support from the International Cooperation Project of the Ministry of Science and Technology (2014DFE60170), the National Natural Science Foundation of China (61474065 and 61674084), the Tianjin Research Key Program of Application Foundation and Advanced Technology (15JCZDJC31300), the Key Project in the Science & Technology Pillar Program of Jiangsu Province (BE2014147-3), and the 111 Project (B16027). The authors also acknowledge support from the PhD Candidate Research Innovation Fund of Nankai University (96172398). The DFT calculations were performed on the KAUST supercomputers.
PublisherRoyal Society of Chemistry (RSC)
JournalJournal of Materials Chemistry A