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Abstract
<p class="first" id="d6561112e93">Dendrites can severely impair zinc battery performance.
An in-depth understanding
of the dynamic morphology evolution of dendrites with operando approaches is pivotal
when addressing these issues. However, in previous studies, the corresponding electrochemical
signals are usually ensemble and averaged. It is very challenging to obtain detailed
information about the key morphology-performance relationship. Herein, correlated
high-resolution operando optical and electrochemical studies of single dendrites on
Pt reflective nanopore electrodes are reported. The zinc deposition and dissolution
can be directly imaged by a high NA optical microscope, while corresponding galvanic
charging and discharging curves are obtained. The correlated information of morphology
changes and dynamic overpotential fluctuations under different circumstances unveils
the competition between active growth vs. passivation. The isolated zinc formation
at the single dendrite level is also evaluated. The methodology can be further extended
to elucidate the direct relationship between dendrite evolution and electrochemical
responses in various battery systems.
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