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Caption : figure s1. schematic diagram of the synthesis of nimnmg-ldh

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Caption : figure s2. sem images of nimn-ldh (a), nimnmg-ldh-7 (b)

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Caption : figure s3. (a) eds spectrum of nimnmg-ldh-7, (b-d) corresponding eds elemental maps

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Caption : figure s4. ftir spectrrum of the synthesized materials

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Caption : figure s5. cv curves of nimn-ldh (a), nimnmg-ldh-4 (c) and nimnmg-ldh-10 (e); gcd curves of nimn-ldh (b), nimnmg-ldh-4(d) and nimnmg-ldh-10(f)

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Caption : figure s6. eis fitting curve of nimnmg-ldh-7

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Caption : figure s7. electrochemical properties of negative activated carbon (ac): (a) cv curves; (b) gcd curves

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Caption : figure s8. (a) gcd curves of asc devices at different current densities; (b) the attenuation curve of specific capacity of asc with the current densities