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Caption : xrd patterns of gqds.

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Caption : (a) fluorescence emission intensities of the gqds at different excitation wavelengths. (b) uv-vis absorption spectrum of gqds.

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Caption : the fesem image of porous nio films on fto glass substrate.

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Caption : synthesis of complex [(tpy-ch=n)2ni]cl2.

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Caption : the 1h nmr characterization for compound l1.

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Caption : the 1h nmr characterization for compound l2.

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Caption : high resolution mass spectrometry of [(tpy-ch=n)2ni]cl2.

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Caption : the elemental mapping of nin-gqds-nio photocathode by edx spectroscopy.

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Caption : xps scan spectrum of nin-gqds-nio photocathode at 0-1200 ev.

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Caption : (a) photocurrent density of the gqds-nio electrodes with different dipping times. (b) photocurrent density of the nin-gqds-nio electrode with different nin co-catalyst loadings.

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Caption : the hrtem image of the assembled nin-gqds-nio photocathode after photoelectric testing