Yang Z, Xie X, Wei J, Zhang Z, Yu C, Dong S, Chen B, Wang Y, Xiang M, Qin H. Interface engineering Ni/Ni12P5@CNx Mott-Schottky heterojunction tailoring electrocatalytic pathways for zinc-air battery.
J Colloid Interface Sci 2023;
642:439-446. [PMID:
37023515 DOI:
10.1016/j.jcis.2023.03.163]
[Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2022] [Revised: 03/23/2023] [Accepted: 03/25/2023] [Indexed: 03/31/2023]
Abstract
Due to the poor bifunctional electrocatalytic performances of electrocatalysts in zinc-air battery, herein, we first synthesized Ni/Ni12P5@CNx Mott-Schottky heterojunction to ameliorate the high-cost and instability of precious metals. We modulated the different contents of Ni and Ni12P5 in the Ni/Ni12P5@CNx Mott-Schottky heterojunction, and found that 0.6 Ni/Ni12P5@CNx has outstanding electrocatalytic performances, with half-wave potential of 0.83 V, and OER potential of 1.49 V at 10 mA cm-2. Also, the ΔE value is only 0.66 V. Moreover, 0.6 Ni/Ni12P5@CNx is assembled into ZAB, which has a high power density of 181 mW cm-2 and a high specific capacity of 710 mAh g-1. This indicates it has a good cycle stability. The density functional theory (DFT) calculations reveal that electrons spontaneously flow from Ni to Ni12P5 through the formed buffer layer in the Ni/Ni12P5@CNx Mott-Schottky heterojunction. The Schottky barrier formed modulates the electrocatalytic pathway to have good bifunctional electrocatalytic activity for ORR and OER.
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